Volcano airspace update

Click to expand. Replay Video. Microsoft and partners may be compensated if you purchase something through recommended links in this article. Found the story interesting? Like us on Facebook to see similar stories. I'm already a fan, don't show this again. Send MSN Feedback. How can we improve? At approximately p. HVO continues to monitor the volcano closely and will report any significant changes in future notices.

Strong winds may waft lighter particles to greater distances. Residents should minimize exposure to these volcanic particles, which can cause skin and eye irritation.

Visitors to Hawai'i Volcanoes National Park should note that under southerly non-trade wind conditions, there is potential for a dusting of powdery to gritty ash composed of volcanic glass and rock fragments. At this time, it is not possible to say with certainty if this activity will lead to an eruption -- the activity may remain below ground, as occurred in August and early December two weeks prior to the December - May summit eruption , when magma intruded beneath the caldera but did not erupt.

HVO will continue to monitor this activity closely and adjust the alert level accordingly. The activity is confined entirely within the park. Satellite images showed emissions of volcanic ash and sulfur dioxide gas from September , Steaming continues to be observed occasionally in satellite data.

Emissions of ash and gas could resume without warning. Mount Pagan is not monitored with ground-based geophysical instrumentation.

We will continue to evaluate satellite imagery, distal geophysical data, and mariner reports when available, but because the volcano is not monitored with ground-based instruments, we cannot provide advanced warning of activity.

Mount Pagan, one of two volcanoes that make up Pagan Island, is located on the northern end of the Island, and is one of the most historically active volcanoes in the Northern Mariana Islands. The last large eruption VEI 4 of the volcano was in , followed by three and a half decades of intermittent activity. Recent activity prior to was characterized by vigorous steam plumes and degassing from a shallow magma source. Over the last few hours, activity has consisted of discrete explosions that occur about once an hour and produce small ash clouds that rise to 10, to 15, feet above sea level and are currently drifting to the northwest.

Activity at Semisopochnoi remains elevated and ash emissions could increase again at any time. Satellite images show an ash cloud up to 10, to 15, feet above sea level and extending approximately 60 miles km to the northwest through UTC. Explosions were detected throughout the night and into this morning. The Alaska Volcano Observatory will continue to closely monitor all available data and provide updates as available.

Satellite images show an ash cloud at an estimated altitude of 15, ft. Explosions have been observed throughout the day and increased sulfur dioxide gas emissions have been observed in satellite data this afternoon.

Increasing high clouds over Semisopochnoi will likely obscure satellite views of ash emissions within the hour. Seismic and infrasound monitoring will continue to provide notice of ongoing explosive activity, however it cannot determine the height or extent of ash emissions. The Alaska Volcano Observatory will continue to closely monitor all available data. The last observations of ash and sulfur dioxide gas emissions in satellite data was on September 6.

Steaming continues to be observed intermittently in satellite data. It is unclear whether the eruption has paused or ended. A continuous plume from the summit extended up to km 93 miles to the northwest and southwest of the volcano at an altitude of 10, ft above sea level for most of the day.

On August 10, AVO detected an increase in small earthquakes, located between 6 and 2 km 4 and 1 miles below sea level, about 5 km 3 miles west of Kliuchef volcano within the Atka volcanic complex.. After several days of increased seismicity, the earthquake rate began to drop, and has subsequently returned to background levels. Previous alerts by the Alaska Volcano Observatory for unrest at the Atka volcanic complex have been for Korovin Volcano, the site of the most recent historical eruptions.

The location of earthquakes, however, is not specific to Korovin and could be related to several other volcanic vents that are part of the Atka volcanic complex, including Mount Kliuchef. The Alaska Volcano Observatory will continue to monitor the Atka volcanic complex for signs of volcanic activity.

The area is monitored by local seismic and infrasound sensors, satellite data, and regional lightning detection instruments. These observations indicate that the immediate potential for an eruption is diminished at this time.

Within the past 24 hours, only 10 earthquakes have been detected in this area. The earthquake swarm began in that region at around p. HST on August 23 and continued until the morning of August 25, HST on August Most of the earthquakes were between magnitude 1 and 2 and occurred approximately km 0. The earthquake swarm was accompanied by change in the rate and style of ground deformation.

These changes indicate reduced potential for an eruption at this time. The most recent SO2 emission rates, measured on August 12, were 50 tonnes per day, close to levels associated with the non-eruptive period from late to late less than 50 tonnes per day. The swarm continues into the early morning hours of August 24 with a particularly strong sequence of earthquakes that occurred at about a.

The activity began around p. The swarm was accompanied by an increase in the style of ground deformation recorded by the Sandhill tiltmeter, just to the west of the earthquake swarm location. At about a. Over earthquakes have been recorded as of a. Small earthquakes are continuing at a rate of at least 10 detected earthquakes per hour.

Currently, webcams and satellite imagery show no evidence of lava at the surface. HVO scientists will continue the monitor the situation and will issue additional messages and alert level changes as warranted by changing activity. These earthquakes have been located 3 to 6 km 1. The earthquakes represent an increase from background seismic activity, but may not necessarily lead to an eruption.

Previous alerts by the Alaska Volcano Observatory for unrest for the Atka volcanic complex have been for Korovin Volcano, the site of the most recent historical eruptions. Intermittent bursts of ash from the summit are producing diffuse ash clouds that are rising just above the summit summit elevation ft above sea level and drifting southeast roughly 6 mi before dissipating.

Seismic and infrasound data indicate that activity consists of occasional small explosions and tremor. The volcano is about 7 km 4.

With over 40 historic eruptions, it is one of the most consistently active volcanoes in the Aleutian arc. Eruptive activity is generally characterized by sporadic Strombolian lava fountaining continuing for a several-month period.

Ash plumes as high as 49, ft ASL have been generated by past eruptions of Pavlof, and during the March eruption, ash plumes as high as 40, feet above sea level were generated and the ash was tracked in satellite data as distant as eastern Canada. The nearest community, Cold Bay, is located 60 km 37 miles to the southwest of Pavlof. Increased activity has also been detected on local infrasound stations, suggesting possible low-level below 10, ft above sea level emissions.

When occurring, small eruptions producing minor ash deposits within the vicinity of the active north crater of Mount Cerberus and ash clouds under 10, ft above sea level are typical of activity at Semisopochnoi.

Furthermore, no indications of the current unrest have been detected in satellite or distal seismic data.

We will continue to evaluate satellite imagery, distal geophysical data, on-island, and mariner reports when available, but because the volcano is not monitored with ground-based instruments, we cannot provide advanced warning of activity.

Gareloi is monitored by a local seismic and infrasound network, satellite data, and regional infrasound and lightning-detection networks. The northern, slightly higher peak contains crater about m 1, ft across. The southern summit has a crater open to the south and a persistent degassing vent fumarole on its western rim. Gareloi has been one of the most active in the Aleutians since the s, with 16 reports of eruptive activity at Gareloi since In , its largest historical eruption produced sixteen small south- to southeast-trending craters that extend from the southern summit to the coast, as well as lava flows and pyroclastic deposits on the southeastern flank of the volcano.

Eruptions of Gareloi commonly produce ash clouds and lava flows, and the primary hazard is airborne clouds of ash that could affect aircraft. This lava dome-like feature appears to have been emplaced sometime between July 14 and Seismicity has been at relatively low levels this week compared to last week and we suspect that the lava dome-like feature was emplaced last week. Moderately elevated surface temperatures consistent with this feature were observed in satellite data on July Cloudy conditions have obscured views of the volcano by satellite most of the past week.

AVO will continue to closely monitor this new uplift feature. The prognosis for eruptive activity is uncertain. Continued growth of the lava dome feature, additional explosive events, or a return to non-eruptive behaviors are all possible.

AVO will report on significant changes and observations in monitoring data should they occur. Great Sitkin is monitored with a local real-time seismic network, which will typically allow AVO to detect changes in unrest that may lead to an explosive eruption. Rapid detection of an ash-producing eruption would be accomplished using a combination of seismic, infrasound, lightning, and satellite data. It is located 43 km 26 miles east of the community of Adak.

The volcano is a composite structure consisting of an older dissected volcano and a younger parasitic cone with a 3-km-diameter summit crater. A steep-sided lava dome, emplaced during an eruption in , occupies the center of the crater. Great Sitkin erupted at least three times in the 20th century, most recently in That eruption produced at least one ash cloud that likely exceeded an altitude of 25, ft above sea level.

A poorly documented eruption occurred in , also producing a lava dome that was partially destroyed in the eruption. Within the past years a large explosive eruption produced pyroclastic flows that partially filled the Glacier Creek valley on the southwest flank. Ash emissions were visible in satellite data beginning around UTC 1 pm AKDT to an altitude of less than 5, feet asl based on wind direction. Satellite observations from yesterday afternoon showed a robust steam plume and sulfur dioxide gas emissions.

Additional ash emissions are probable, but not certain. No eruptive activity or emissions from the summit have been observed.

This does not mean that an eruption is likely or imminent. However, past eruptions of Pavlof occurred with little or no warning. Recent field operations were successful in restoring seismic stations on Veniaminof allowing AVO to resume monitoring potential activity at the volcano. Recent eruptions in , , , and all occurred at the intracaldera cone and lasted for several months. These eruptions produced lava spattering and fountaining, minor emissions of ash and gas, and small lava flows into intracaldera icefield.

Minor ash-producing explosions occurred nearly annually between and Previous historical eruptions have produced ash plumes that reached 15, to 20, ft above sea level , , and and ash fallout that blanketed areas within about 40 km 25 mi of the volcano , Satellite views over the past few weeks have detected elevated surface temperatures, and sulfur dioxide emissions were observed on several occasions, indicating continued volcanic unrest, but no recent ash deposits have been observed.

There have been no other notable changes at the volcano in satellite data or web camera views. Sulfur dioxide gas was detected in satellite imagery from Gareloi over the past week and is consistent with measurements from the last several years. No activity was observed by an AVO field crew flying over the summit on May Gareloi volcano persistently emits magmatic gases from a fumarole field on the south crater and commonly exhibits low-level seismic activity.

These observations suggest the presence of shallow magma and potential interaction with a hydrothermal system. The current increase in seismicity likely reflects a change to the magmatic-hydrothermal system, but it is not clear that the likelihood of a volcanic eruption has increased.

AVO will continue to monitor activity to determine if the recent changes are related to influx of new magma or other changes to the magma system. Satellite observations showed very minor steaming and slightly elevated surface temperatures during breaks in the cloud cover yesterday afternoon. The prognosis for renewed eruptive activity is uncertain. Additional explosive events, the eruption of lava, or a return to non-eruptive behaviors are all possible.

Should volcanic activity change significantly a new Volcanic Activity Notice will be issued. Visibility of the plume varies with humidity and temperature and may be stronger in the early morning. Dwindling lava supply over the previous month had caused the active lava lake to shrink to two small ponds by May 11th and was completely crusted over by May 20th.

The last surface activity on the lake was observed on May 23nd. Changes in the lava lake have been accompanied by a drop in gas emissions to levels close to pre-eruption background level.

Seismic tremor persistent during the eruption has weakened significantly but continues to indicate some shallow magmatic activity. Since May 11th, there has been weak inflation and an increase in shallow volcano tectonic earthquakes at the summit, suggesting magma entering the system is being stored at depth.

There are currently no indications suggesting that a resumption of volcanic activity is imminent. Sulfur dioxide SO2 gas emissions have greatly decreased.

However, local concentrations of sulfur dioxide SO2 or hydrogen sulfide H2S may persist in downwind areas, and residents may from time to time notice odors of these gasses. Since that explosion, seismicity has decreased and satellite images show no further ash emissions. Additional explosive events are possible, but not certain. The ash cloud from the initial explosive eruption is still visible in satellite images.

Since that explosion, seismicity has decreased and satellite images show that the ash cloud has detached from the vent and is moving towards the east. Initial mariner reports suggest the cloud is as high as 15, ft asl, but is still developing. These data indicate an increased potential for eruptive activity at Great Sitkin. Last week, elevated surface temperatures and sulfur dioxide emissions were observed in satellite data, and robust steaming was observed by AVO field crews on Adak Island.

Small eruptions producing minor ash deposits within the vicinity of the active north crater of Mount Cerberus and ash clouds under 10, ft above sea level are typical of recent activity at Semisopochnoi. Weather clouds up to 15, ft above sea level currently obscure the volcano. An infrasound array on Adak Island may detect explosive emissions from Semisopochnoi with a slight delay approximately 13 minutes if atmospheric conditions permit. Satellite detections of increased volcanic gas emissions have been observed beginning on May In addition, there has been a slight increase in local seismicity over the past two days.

These data indicate a potential for increased eruptive activity at Great Sitkin. These stations may come back online as snowpack decreases. Eruptive activity at Veniaminof usually consists of minor ash emissions, lava fountaining and lava flows from the small cone in the summit caldera. Ash emissions are typically confined to the summit crater, but larger events can result in ash fall in nearby communities and drifting airborne ash.

Partly cloudy satellite views this week have shown no recent ash deposits or elevated surface temperatures, and only steam was observed within the north crater of Mount Cerberus.

Sulfur dioxide emissions were observed this week on May 1 and 5, signifying continued volcanic unrest. AVO will continue to monitor activity at Semisopochnoi with satellite and regional infrasound data. Satellite views of the volcano show a continuous plume extending 50 miles 80 km to the south at approximately feet a.

A regional infrasound array has detected this increase in activity. Small eruptions producing minor ash deposits within the vicinity of the volcano and ash clouds under 10, ft above sea level are typical of activity at this volcano. Seismicity has continued to decline, but remains above background levels. AVO continues to monitor Veniaminof with a local seismic stations, remote infrasound and lightning networks, and satellite and webcam images.

As a result, AVO is unable to assess seismic unrest at this volcano. With four local seismic stations active, the Alaska Volcano Observatory can resume locating earthquakes and detect unrest at Tanaga. Satellite views of the volcano have been mostly obscured, but a recent clearing suggests activity has declined and no significant ash plume was observed.

It is likely that low-level eruptive activity continues and may not be detected by regional infrasound sensors or above the low clouds in satellite data. AVO will continue to monitor the situation. The ash cloud extends more than mi km southeast of the volcano with heights up to 20, feet 6 km above sea level. The ash cloud extends up to mi km southeast of the volcano with heights up to 20, feet 6 km above sea level. Seismic activity remains elevated. The Alaska Volcano Observatory continues to monitor Veniaminof with a local seismic network, remote infrasound and lightning networks, and satellite and webcam images.

The Alaska Volcano Observatory continues to monitor Shishaldin with the local seismic, GPS, and tilt stations, web camera imagery, remote infrasound and lightning networks, and satellite images. No ash emissions or steam plumes were visible during clear weather conditions on April 1. Elevated surface temperatures continue to be detected in satellite images, but are consistent with heat from recently erupted and now cooling lava flows.

No significant seismicity or infrasound has been detected in the last 4 days. Pauses in eruptions are common, and lava flows and eruption of minor ash plumes could resume suddenly with little or no warning. Additional seismic stations may come back online this spring as snowpack decreases. Seismic stations may come back online this spring as snowpack decreases. Any eruptive activity may still be detected, although with some delay, with regional infrasound networks, detection of lightning, and monitoring of satellite images.

In addition, a local earthquake occurred on March 10 and it was large enough to be measured on seismometers km away on Umnak Island. These data indicate a potential for increased eruptive activity at Cleveland. Explosions from Cleveland typically produce relatively small volcanic ash clouds that dissipate within hours; however, more significant ash emissions are possible.

Cloudy weather conditions are obscuring satellite views of the volcano. It is unknown if the explosion produced a low-level ash cloud or local ash deposit.

Small eruptions producing minor ash deposits within the vicinity of the volcano are typical of activity during unrest at Semisopochnoi since September Local seismic stations have been offline since November 11, New explosions could occur at anytime with no warning. An infrasound array on Adak Island could detect explosive emissions from Semisopochnoi with a 13 minute delay if atmospheric conditions permit.

Satellite and webcam views indicate low-elevation Eruptive activity usually consists of minor ash emissions, lava fountaining and lava flows from the small cone in the summit caldera. Clouds obscured views into the crater and the southern side of the volcano. Any ash clouds associated with these deposits have not been observed and are likely low-level Small eruptions producing minor ash deposits within the vicinity of the volcano are typical of activity during unrest at Semisopochnoi since September Steam emissions obscured views into the crater.

Small eruptions producing minor ash deposits within the vicinity of the volcano are typical of activity during unrest at Semisopochnoi since September , with the last detected activity in June The most recent activity in mid-March was confined to the summit crater except for minor ash deposits near the summit. Only minor rockfalls within the summit crater, not associated with eruptive activity, have been detected since early April. Pauses in eruptions are common at Shishaldin, and therefore eruptive activity could resume with little warning.

The Alaska Volcano Observatory will continue to monitor the volcano closely. The Alaska Volcano Observatory continues to monitor Shishaldin with the local web camera imagery, satellite data and remote infrasound, seismic and lightning networks. The Alaska Volcano Observatory continues to monitor Veniaminof with satellite data and remote infrasound, seismic and lightning networks.

At p. The eruption is currently taking place entirely within the park. HST on the evening of December 20, accompanied by ground deformation detected by tiltmeters. The steam plume dissipated shortly thereafter. The lava lake has been rising approximately several meters yards an hour since the eruption began. The current lava lake exhibits a circulating perimeter, but stagnant center. Rates of tilting have decreased slightly since the beginning of the eruption. Increased rates of seismicity in the summit region continue.

Some of these earthquakes may be felt. A magnitude Visitors to the Hawai'i Volcanoes National Park should note that under southerly non-trade wind conditions, rockfalls and explosions can result in a dusting of powdery to gritty ash composed of volcanic glass and rock fragments.

The body of water grew into a lake as the water sought equilibrium with the surrounding groundwater. Whereas this type of seismicity was observed on average once every few weeks following the eruption, rates have increased to over a dozen in the past several days.

Other monitoring data streams including volcanic gas and webcam imagery were stable until this eruption commenced. Prognosis: It is unclear how long the current eruption will continue. HVO continues to monitor the ongoing eruption and all aspects of the volcano closely; HVO will report any significant changes. If anything develops that may affect your safety, you will be informed. Contacts: askHVO usgs. As SO2 is released from the summit during this new eruption, it will react in the atmosphere with oxygen, sunlight, moisture, and other gases and particles, and within hours to days, convert to fine particles.

Vog creates the potential for airborne health hazards to residents and visitors, damages agricultural crops and other plants, and affects livestock operations. High winds may waft lighter particles to greater distances. Residents are urged to minimize exposure to these volcanic particles, which can cause skin and eye irritation similar to volcanic ash. The situation is rapidly evolving and HVO will issue another statement when more information is available. While uplift related to post-collapse inflation of the summit reservoir has been occurring since March of , rates have been steadily increasing in recent months and are currently higher than they have been since the end of the eruption.

The injection resulted in about 8 cm 3 inches of uplift of the caldera floor, and modeling suggests that it represented 0. Other monitoring data streams including volcanic gas and webcam imagery were stable until this eruption. An earthquake swarm began on the evening of December 20, accompanied by ground deformation detected by tiltmeters. An orange glow was subsequently observed on IR monitoring cameras and visually beginning approximately HST.

At the present time, no explosions have been detected. The longest known eruptive pause was in , ending with eruption in the caldera.

Neither that year pause, nor any other shorter pause, followed partial collapse of the caldera such as the collapse that occurred in the summer of Following partial caldera collapses, the first eruption outside the caldera took place on the East Rift Zone 17 years after the collapse, on the Southwest Rift Zone 28 years after the collapse, and on the Southwest Rift Zone 52 years after the collapse.

After partial caldera collapses in and , lava returned to the caldera within days to a few weeks. The length of the current pause exceeds those earlier post-collapse pauses.

Since then, the body of water has grown into a lake, which continues to rise as it seeks equilibrium with the surrounding groundwater. HVO continues to monitor the volcano closely and will report any significant changes. Seismic activity has returned to background levels and satellite observations over the past several weeks have shown no signs of unrest. Korovin is monitored by local seismic and infrasound sensors, satellite data, regional lightning detection instruments, and reports from local residents.

Observations of steaming are not unusual at Korovin and meteorological conditions can enhance its visibility. The volcano has two distinct summit vents about 0. The most recently active of the vents maintains a small, roiling, lake that occasionally produces energetic steam emissions.

Thermal springs and fumaroles located on and near the volcano indicate an active hydrothermal system. Korovin has erupted several times in the past years, including , , and , and has likely had small ash emissions as recently as Typical recent Korovin eruptions produce minor amounts of ash and occasional but small lava flows.

Reports of the height of the ash plume produced by the eruption ranged from to 10, m 16, to 35, feet above sea level. Seismicity has persisted above background levels since that time, but had decreased to very low levels before a satellite link for transmitting seismic data failed on November 11, Since that time, no changes have been observed in satellite data, and no explosions have been detected from the Adak Island infrasound array.

Low-level seismic unrest may be continuing undetected. The satellite link is not likely to be reestablished without a site visit. Despite the lack of eruptive activity since mid-June, Semisopochnoi has been in a state of unrest since September , producing sporadic low-level explosions and elevated seismicity.

Future small explosions may occur without warning and typically generate small clouds of volcanic ash that are a hazard in the immediate vicinity of the erupting vent at North Cerberus. More significant ash emissions may be possible, but have not been observed during the — eruptive period. Semisopochnoi is also monitored remotely with satellite observations and lightning sensors.

Discrete earthquakes have been detected over the past two weeks and sulfur dioxide degassing has been detected four times in satellite data on October 15, 20 and Clear satellite views show no other signs of activity at this time. AVO will continue to monitor the volcano for signs of volcanic activity.

Korovin is monitored by local seismic and infrasound sensors, satellite data, and regional lightning detection instruments. No eruptive activity or unusual surface temperatures have been observed in clear satellite imagery. AVO will continue to monitor the volcano using seismic, infrasound, web camera, and satellite observations. As at other Alaska volcanoes, AVO will continue to monitor seismic, satellite, infrasound, and lightning data, and reports from pilots and ground observers to detect signs of eruptive activity.

No eruptive activity or unusual surface temperatures have been observed in clear satellite and web camera images. Eruptions at Pavlof often occur with little or no precursory activity, and AVO will continue to monitor the volcano using seismic, infrasound, web camera, and satellite observations. No eruptive activity or emissions from the summit have been observed in cloudy satellite and web camera views.

This earthquake sequence was focused within an area about 6 miles 10 km east of the summit at a depth of about 5 miles 8 km. Other data streams showed no signs of surface changes during the seismic sequence that started in June.

The volcano is monitored with a network of seismic instruments, web camera, GPS, satellite data, and regional infrasound and lightning detection instruments. Makushin is a broad, ice-capped stratovolcano which rises to an elevation of feet.

The summit caldera, 3 km diameter, is the site of frequent steam and minor ash eruptions; however, no large eruptions have occurred in this century. The community of Unalaska and port of Dutch Harbor are located 25 km 16 miles east of Makushin volcano. The last eruptive activity at Cleveland Volcano was a short-lived explosion on the evening local time of June 1, Since then, there has been no evidence from satellite observations of elevated surface temperatures, and there have been no observed changes in the summit crater.

Tremor at Veniaminof in the past has sometimes preceded eruptions, but also can occur and persist for weeks to months and not result in an eruption. The Alaska Volcano Observatory continues to closely monitor Veniaminof with local seismic sensors, satellite data, web cameras, and remote infrasound and lightning networks.

Satellite views over the past few weeks suggest typical background surface temperatures and light steaming at the summit and no signs of new volcanic activity within the crater. Shishaldin is monitored by local seismic and infrasound sensors, satellite data, a web camera, a telemetered geodetic network, and distant infrasound and lightning networks.

This represents a departure from background activity. This type of seismic activity typically precedes eruptive activity at Veniaminof but does not mean that an eruption will occur. Eruptive activity usually consists of minor ash emissions, lava fountaining and lava flows from the small cone in the summit caldera. Veniaminof volcano is monitored by local seismic sensors, satellite data, web cameras, and remote infrasound and lightning networks. Cleveland is almost always in a state of unrest and explosions will occur without warning.

They typically generate small clouds of volcanic ash that are a hazard in the immediate vicinity of the volcano. Ash fall on the upper flanks of the volcano is also common. The local geophysical stations and web camera at Cleveland are currently unavailable due to an ongoing network outage. Rapid detection of an ash-producing eruption may be possible using a combination of regional infrasound, lightning, and satellite data.

This represents a significant departure from background earthquake activity and may be associated with volcanic unrest. This unrest could result a future eruption, however that is not a certainty. Aftershocks continue, as would be expected with earthquakes of this size. No other significant activity was detected and local monitoring stations are offline. A small ash plume was observed at 22, ft drifting to the south. Cleveland volcano is monitored with a limited real-time seismic network, which inhibits AVO's ability to detect precursory unrest that may lead to an explosive eruption.

The last explosive eruption at Cleveland occurred on January 9, , and was followed by the extrusion of a small mound of lava in the summit crater.

Since then, there has been an overall decrease in detected surface temperature and no observed changes in the summit crater. Cleveland is one of the most active volcanoes of the Aleutian Arc, and the latest eruptive phase has waxed and waned almost annually since Local seismic, infrasound, and web camera data have been mostly unavailable for several weeks due to an equipment failure in a remote facility.

Nonetheless, monitoring of Cleveland continues with regional seismic and infrasound stations on nearby islands. These, along with lightning and satellite data, should allow AVO to detect an ash-producing eruption, if one were to occur. Similarly, satellite views show no lava or changes within the crater since the start of April, accompanied by a decrease in surface temperatures.

Eruptive activity therefore appears to have ended or paused. Eruptive activity at Shishaldin paused after the explosion on January 19, , before resuming at a low level mid-March. It is therefore possible for eruptive activity to resume with little warning and AVO will continue to monitor the volcano closely. A robust steam plume and a crater lake have been seen in clear satellite images, but no recent ash deposits.

Although seismic activity remains above background, it does not appear to be increasing towards an eruption in the short-term. Unrest continues. Seismic activity persists and is characterized by occasional small earthquakes and satellite data show detectable volcanic gas sulfur dioxide being emitted from the volcano. Explosive activity could resume with little to no warning. No significant ash emissions have been detected in satellite images; clouds cover much of the island to around 10, ft.

Weak seismic tremor has also been detected. No significant ash or lava signatures are apparent outside the summit crater at this time. Eruptive activity could increase with little or no warning resulting in lava flows outside of the crater, lahars, and low-level ash clouds.

During the current eruptive cycle, larger ash clouds have also been produced. No eruptive activity or emissions from the summit have been observed since minor steam emissions in late February. Repairs are not feasible during the winter months.

Without seismic data AVO cannot verify that the volcano is at its normal background state. Planned field work in April and during the summer will reestablish and improve the seismic monitoring network.

At this time, rapid detection of an eruption if one were to occur may be possible using a combination of distant seismic and infrasound networks, lightning, and satellite data. Seismic activity persists and is characterized by short bursts of volcanic tremor and earthquakes.

There has been no evidence of eruptive activity in geophysical data streams or in satellite observations. No ash plumes have been observed, however low-level ash emissions may accompany these minor explosions. In addition, satellite views of the volcano over the same period show a decrease in surface temperatures at the summit. Eruptive activity appears to have ended or paused. It is possible for eruptive activity to resume with little warning and AVO will continue to monitor the volcano closely.

Seismicity is currently low. Lava gradually filled South Pit until it overflowed on January 25, spilling to the southeast. This flow advanced almost 9 km 5. Direct and continuous observation of the eruption was hindered by the difficulty of reaching Mauna Loa's summit at 4, m 13, feet above sea level, especially during harsh winter storms, but people flocked to the island to view it from afar. There was even a special steamer excursion from Honolulu to allow passengers to view the eruption from the sea.

Eruptive activity began to weaken in early February. As the fountains decreased in size, they erupted denser lava fragments, creating a small, double "conelet" of spatter and coarse cinder within the breached pumice cone.

On February 5, the lava fountains ceased, and, for a time, the eruption seemed to be over. However, fume rising from the summit was frequently observed through the rest of February and March. On several occasions, a distinct glow could also be seen, indicating that magma remained high in the conduit. Exactly when the summit eruption ended is uncertain, but it's estimated to be on June 1.

If so, it lasted days—second only to the day-long summit eruption in There have been no new breakouts on the coastal plain in nearly two weeks, but there was a minor breakout near the top of the pali in the past week.

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