GLOBAL VOLCANISM: The Latest Report Of Volcanic Eruptions, Activity, Unrest And Awakenings – April 20-24, 2016! [PHOTOS + VIDEO]

Sinabung volcano. Endro Lewa

April 24, 2016 - EARTH - The following constitutes the new activity, unrest and ongoing reports of volcanoes across the globe.


Sinabung (North Sumatra, Indonesia): The Sinabung is always active in recent days.

Great photos of Firdaus Surbakti and Endro Lewa allow to detail the evolution of the pyroclastic flow of April 20.

Beidar Sinabung

Beidar Sinabung

Beidar Sinabung

Endro Lewa

Santiaguito (Guatemala): Another large eruption occurred at the Caliente dome yesterday morning, at around 6 am, with a new series of collapses that generated pyroclastic flows and an impressive ash plume that rose approx. 3 km above the lava dome.

Santiaguito volcano in Guatemala. Matthew Karsten

Ash plume from Santiaguito. Carlos Ventura / Prensa Libre

Carlos Ventura / Prensa Libre

According to INSIVUMEH, the source of the collapses is the continued supply of viscous lava that extrudes into the summit of the Caliente dome, and the collapse and pyroclastic flows affected its eastern side.

Ash fall occurred in areas to the west and southwest in up to 25 km distance, including the towns of Cuyotenango, San Francisco, Zunilito and Pueblo Nuevo.


WATCH: Santiaguito volcano erupts.

Masaya (Nicaragua): The lava lake in the volcano's summit crater continues to be very active and its level has risen a bit during the past days, INETER reports.

View of Masaya's lava lake. INETER crater webcam

Seismic activity, including tremor reflecting the degassing of the lava lake, fluctuates at moderate to high levels.


Pavlof (Alaska Peninsula, USA): Seismic activity at the volcano has continued to decrease over the past two weeks and no anomalous activity has been detected in satellite data since weakly elevated surface temperatures were seen on April 8.

AVO is therefore lowering the aviation color code to GREEN and the Volcano Alert Level to NORMAL.


Langila (New Britain, Papua New Guinea): Darwin VAAC reported ash emissions from the volcano that rose to 7,000 ft (2.1 km) altitude and drifted up to 100 km north.

Aviation color code is at orange.


Alaid (Northern Kuriles, Kuril Islands): Eruptive activity on the remote volcano continues; satellite images show fresh ash deposits and evidence a strong heat source from the crater.

Satellite image of Alaid, showing ash-darkened snow. Terra satellite / NASA

Heat signal from Alaid volcano. MIROVA

Kliuchevskoi (Kamchatka):  The volcano continues to be in mild to moderate strombolian activity.

Strombolian activity at Klyuchevskoy volcano.Yury Demyanchuk

Dukono (Halmahera, Indonesia): Intense ash emissions continue from the volcano.

Dukono's ash plume. Aqua / NASA satellite image

This morning, VAAC Darwin reported a plume at approx. 7,000 ft (2.1 km) altitude extending 50 km to the NE, well visible on satellite images.


Nevados de Chillán (Chile):  New ash emissions occurred yesterday morning, generating a small plume that rose approx. 500 m.

Small ash emissions from Nevados de Chillán volcano. SERNAGEOMIN

According to Sernageomin, this activity is not caused directly by fresh magma, but related to disturbances of the shallow hydrothermal system which interacts with an underlying, probably only small body of magma.SERNAGEOMIN also reported a slight increase in earthquakes typical of internal fluid movements (LP- long period events) during the past weeks and that sporadic ash emissions are likely to continue.

The volcano's alert level remains at "yellow" and it is recommended to stay outside a radius of 2 km around the active craters


Popocatépetl (Central Mexico): Following Monday's large explosive activity (2 hours of lava fountaining), the volcano returned to be relatively calm, producing only steam emissions and no significant explosions.

Steam emission ("exhalation") from Popocatepetl volcano.

Bright glow remains visible from the summit, indicating that magma continues to rise and accumulate at the summit vent.


Suwanose-jima (Ryukyu Islands, Japan):  The strombolian-type activity from the volcano on the small island in southern Japan continues to be elevated.

Ash plume from an eruption at Suwanose-jima volcano. JMA webcam

Frequent explosions produce small to moderate ash plumes that rise to altitudes of 5-7,000 ft (1.5-2 km).

Constant glow is visible from the O-take crater at night.


Soufrière Hills (Montserrat): On the island of Montserrat, heavy rains have eroded and re-mobilized the eruptive ash deposits in the Belham Valley, creating lahars there and making of this a dangerous area.

Lahars in the Belham Valley. MVO

The activity of the volcano Soufriere Hills, remains unchanged, characterized by a plume of gas blown northwards towards uninhabited areas. The alert level remains at 1.




Etna (Sicily, Italy): At Etna, ash emissions are noticed on the night of April 20 to 21, still visible the next morning at the northeast and new southeast craters.

 EtnaLive site states, based on the latest multidisciplinary INGV Catania report on the April 19th, that at the level of Bocca Nuova, the crater floor collapsed gradually, to produce the formation of a new crater in the fossa.
 

Bocca Nuova Etna - the red arrow indicates the collapse. INGV Catania

Etna summit craters - with legend. Joseph Nasi / Butterfly helicopters Service

Nevado del Ruiz (Colombia): The volcano produced a small ash plume today, Manizales volcano observatory reported to Washington VAAC.

Webcam views are obscured by weather clouds.Sporadic mild ash emissions have been occurring from the volcano from time to time during the past weeks.




- Volcano Discovery | MVO | INGV Catania | GVP.

GLOBAL VOLCANISM: The Latest Report Of Volcanic Eruptions, Activity, Unrest And Awakenings – March 3-7, 2016! [PHOTOS + VIDEOS]

Strombolian eruption at Tungurahua on March 2, 2016. (Photo: E. Gaunt - OVTIGEPN)

March 7, 2016 - EARTH - The following constitutes the new activity, unrest and ongoing reports of volcanoes across the globe.


Tungurahua (Ecuador): The volcano is in a phase of mild to moderate strombolian activity. Incandescent bombs are ejected to the upper slopes of the volcano, generating avalanches. Ash plumes rise up to a few km above the crater and drift mostly in westerly directions.

Apparently, the large vent-clearing explosion on 27 Feb has opened the conduit to allow a sustained slow rise of magma and more gradual release of gas pressure in small discrete explosions (= strombolian activity).

In its latest report, IGEPN published a series of remarkable photos taken during cloud-free periods at night.



Nevado del Ruiz (Colombia): An explosion occurred at the volcano this morning, producing an ash plume that rose 3000 m above the summit. The eruption was accompanied by Ash falls occurred later in several nearby towns to the NW including Chinchiná, Villamaría, Manizales and Palestine.

Nevado del Ruiz' eruption column. (Photo: Luis Guillermo Velásquez / La Patria)

The regional La Nubia airport was closed today after noon.


Shiveluch (Kamchatka): The lava dome continues to be very active, generating frequent rockfalls and small glowing avalanches on the SW side as well as, more rarely, on the SE side as can be seen on today's time-lapse video.


WATCH: Time-lapse of Shiveluch.

A larger event might have taken place after dark, as Tokyo VAAC reported an ash plume to 18,000 ft (5.4 km) altitude this morning 08:20 UTC (17:20 local time in Kamchatka).



Copahue (Chile): The activity at the volcano, near-constant degassing with sometimes ash emissions, has decreased over the past weeks. Ash venting has become less frequent and intense, and the glow from E Agrio crater that had been visible at the crater disappeared.

Weak steam/ash plume from Copahue.

According to the Chilean scientists from SERNAGEOMIN who monitor the volcano, the current activity of the volcano is being caused by the interaction of a small volume of new magma under its highly active shallow hydrothermal system - none or little of this magma reaches the surface itself, but the heat transfer into the circulating fluids causes fragmentation by small explosions and the emission of gasses and particles (ash). This activity reflects in a continuous tremor signal of moderate intensity.

Scientists concluded that the new magma volume has been too small to greatly affect the internal balance in the hydrothermal system. Other geophysical parameters such as rate of degassing and deformation are mostly within normal levels of the volcano. It is therefore expected that the current activity continues in the coming weeks to months at fluctuating rates. This includes possible short-lived phases of more pronounced sporadic phreatic to strombolian explosions.




Chripoi (Kurile Islands, Russia): A new eruption might have taken place at the volcano this afternoon. Based on satellite imagery, Tokyo VAAC reported an ash plume to estimated 20,000 ft (6 km) altitude that drifted east.

Whether or not an eruption took place still needs to be confirmed.



Alaid (Northern Kuriles): A new eruption is occurring at the volcano, satellite images show. A pronounced steam plume with possible ash content can be seen drifting west from the volcano, at estimated 13,000 ft (4 km) altitude. In addition, NASA's MODIS and VIIRS sensors have been detecting an intense heat source from the volcano's summit lately.

Steam plume from Alaid volcano. NASA Suomi NPP satellite image

Bromo (East Java, Indonesia): The latest eruptive cycle of the volcano might have ended. No more eruptions (explosions, ash emissions) have been observed during the past 2 weeks and seismic activity has returned to normal levels as well, our friend Oystein Andersen from Jakarta reported.

Tokyo VAAC raised the aviation color code to orange.


Suwanose-jima (Ryukyu Islands): The (probably) strombolian-type activity that had started a few days ago continues at the Otake crater and is visible as bright glow from neighboring islands.

Glow from Suwanose-jima's active crater.

Manam (Papua New Guinea): New activity has been reported from the volcano this morning. A pilot reported an ash plume at approx. 10,000 ft (3 km) altitude extending 50 km to the SE. A plume, along with a thermal signal, can also be seen on the latest satellite image.

Ash plume from Manam volcano

You can find photos and more detailed reports of the latest eruption at his website.


Telica (Nicaragua): The volcano has remained mostly calm during the past 24 hours. Sporadic weak ash emissions occurred at night, but glow could no longer be seen from the crater.

Ash emission from Telica.

Masaya (Nicaragua): The activity of the lava lake in the Santiago crater has been increasing in the past week. In a recent bulletin, INETER mentions that the previously two ponds in two adjacent vents have now joined, probably as a result of erosion by the violently degassing and convective lava.

The following video taken on the 1st of March gives a good impression:


WATCH: Activity at the Masaya lake.

Nevados de Chillán (Central Chile): A small eruption occurred at the volcano again yesterday, the first activity since the mild explosive activity on 7 February. Starting around noon, the volcano began to emit a steam plume of variable intensity, sometimes mixed with ash. The activity took place at one of the new craters that had formed in early February.

Eruption of Nevados de Chillan volcano

According to SERNAGEOMIN, seismicity and other monitored parameters had shown little fluctuations during most of February, but then started to increase at the end of the month, possibly related to a slowly ascending body of magma. Yesterday's new activity is likely the result of this and could be a precursor of more activity in the near to medium future.


Bagana (Bougainville Island, Papua New Guinea): Based on Himawari-8 satellite data, Darwin VAAC reported an ash emission from the volcano at 7,000 ft (2.1 km) altitude last evening, creating a plume that drifted 100 km to the NE. Aviation color code is at Orange.


Kilauea (Hawai'i): The activity of the volcano remains essentially unchanged. Rising magma levels under the east rift zone briefly caused an overflow of lava that erupted from a spatter cone within the southern part of the Puʻu ʻŌʻō crater.

Thermal image of the lava overflow inside Kilauea's Pu'u 'O'o crater

This activity started around 8:15 a.m. local time yesterday (2 Mar), covered part of the crater floor and ceased at about 15:00 local time. No lava flowed beyond the crater. According to HVO, "this type of activity is not unusual for Puʻu ʻŌʻō, and does not reflect a significant change in the ongoing eruption".
At the summit caldera, rising magma levels temporarily brought the surface of the lava lake inside Halema'uma'u back in sight from the Jaggar Museum overlook in the early morning hours before receding.

Scattered surface flows remain active on the 'June 27th' flow field, all within about 6.0 km (4 mi) of Puʻu ʻŌʻō and do not currently threaten any nearby communities. Seismicity and deformation are within normal levels throughout the volcano.


Popocatépetl (Central Mexico): No significant changes in activity have occurred over the past weeks. Bright glow at the summit crater indicates that the lava dome in its inner crater continues to grow slowly.

Intermittent weak to moderate explosions (on average 2-3 per day) sometimes produce ash plumes that rise up to 1-2 km and rarely eject incandescent material outside the crater.


WATCH: Glow from Popocatepetl volcano.

Fuego (Guatemala): The volcano's activity started to drop again to normal levels (intermittent small explosions) yesterday evening - the most recent paroxysm has now ended.

View of Fuego volcano.

Barren Island (Indian Ocean): Weak eruptive activity continues at the summit vent of the remote and rarely directly observed volcano, satellite data indicates.

A thermal hot spot has been present regularly during recent weeks, and on cloud-free days, a steam-gas plume can often be seen drifting from the island that sometimes contains some ash.

Steam (and ash?) plume from Barren Island on March 1(red spot is a thermal anomaly detected by the VIIRS radiometer onboard NASA's Suomi NPP)

What exactly the activity is like is difficult to say, but most likely is mild strombolian activity and/or the occasional presence of a (very small) lava lake in the summit crater.

- Volcano Discovery .

GLOBAL VOLCANISM: The Latest Report Of Volcanic Eruptions, Activity, Unrest And Awakenings – February 6, 2016! [PHOTOS + VIDEOS]

Popocatepetl volcano.

February 3, 2016 - EARTH - The following constitutes the new activity, unrest and ongoing reports of volcanoes across the globe.


Popocatepetl (Mexico): In the last 24 hours the Popocatepetl had nine explosions and 35 exhalations of low intensity, according to the monitoring system of the volcano, reported Cenapred.

In its latest report, the body of the Ministry of the Interior explained that four of the nine explosions occurred yesterday at 15:33, 20:19, 21:22 22:48 hours and five on Tuesday.

Also said that since Tuesday morning has been a slight emission of water vapor and gas that winds have scattered to the east-northeast.

Photo: CENAPRED.

He recalled that the light of volcanic alert remains at yellow phase two level at which it is contemplated that the explosive activity continues at a low level, falling ash and even possibility of pyroclastic flows and mudflows.

So the Cenapred urged people not to approach the volcano by the danger of falling ballistic fragments and suggested the public be alert to warnings authorities disseminate Civil Protection.

WATCH: Live streaming Popocatepetl volcano.

Copahue (Chile): Ash plume from Copahue yesterday During the past weeks, the El Agrio crater has continued to emit weak, but near-continuous emissions of fine gray ash.

Incandescence remains visible at night.

Ash plume from Copahue

According to SERNAGEOMIN, this current activity, mainly phreatic, is caused by interaction of a small body of new magma interacting with the hydrothermal system at shallow depth.

Seismic activity, although above background, is relatively low as are other monitored parameters (e.g. deformation, SO2 output etc). No larger eruption is expected for the near future.


Barren Island (India):  Minor eruptive activity (possibly strombolian) seems to continue on the remote island, at least intermittently.

Steam / ash plume and thermal hot spot at Barren Island on February 1, 2016 (MODIS / VIIRS NASA imagery)

Yesterday and the day before, a weak steam and possibly ash plume was visible on satellite imagery as well as a thermal hot spot.


Turrialba (Costa Rica): Weak, passive ash venting occurred yesterday at the western pit crater, showing that volcanic unrest continues.

Ash plume from Costa Rica's Turrialba volcano yesterday

Karymsky (Kamchatka): Several ash plumes reaching estimated 13-16,000 ft (4-5 km) altitude have been reported by Tokyo VAAC during the past days, suggesting that the volcano's intermittent explosions are currently more frequent and relatively intense.


Masaya (Nicaragua): INETER reported ongoing strong seismic and surface activity.

There here are currently two small lava lakes active contained in two pits inside the Santiago crater. Access to Masaya's crater rim, a very popular tourist destination, was closed to the public on Saturday.

An earthquake of magnitude 3 on Friday, felt by many residents, probably accompanied the opening of the second vent in the NE section of the crater.

A third vent is in the process of forming in the SE section of the crater, the latest INETER report stated.



Nevados de Chillán (Central Chile): A series of new explosions with small to moderate ash emissions occurred at the volcano during the end of last week.

This activity formed a second new crater, approx. 25x30 m wide and located 50 m beneath the northeast flank of Arrau crater, as SERNAGEOMIN staff observed on an overflight on 30 January.

Aerial view of Nevados de Chillán volcano's Arrau crater on January 30, 2016 (SERNAGEOMIN)

According to Chilean scientists, the activity is caused by phreatic (steam-driven) explosions in the shallow hydrotermal disturbances, not by fresh magma.

Temperatures in the crater areas were found to be relatively low (approx 120 deg C), which supports this interpretation as well.

It is likely that more explosions occur in the near future and an exclusion zone of 2 km around the crater was put in place.


Heard (Australia, Southern Indian Ocean): An eruption was observed by crew on board the CSIRO research vessel Investigator in late January.


WATCH: A lava flow was seen descending the NW flank of Mawson Peak.

Weak thermal anomalies were also detected on satellite data at the end of January. Whether the activity is still going on or not is impossible to determine - most of the days, the volcano is hidden beneath thick clouds preventing satellite observations.

- Volcano Discovery | El Universal [Translated].

GLOBAL VOLCANISM: The Latest Report Of Volcanic Eruptions, Activity, Unrest And Awakenings – December 12-14, 2015! [VIDEO]

Colima volcano sends huge plume of ask into the sky (Storyful / YouTube / webcamsdemexico)

December 15, 2015 - EARTH - The following constitutes the new activity, unrest and ongoing reports of volcanoes across the globe, courtesy of Volcano Discovery.


Colima (Mexico): Dramatic footage shows the volcano sending a giant column of ash nearly 1.5 miles up into the atmosphere.

The volcano erupted on Monday.

Nearby residents were warned to beware of falling ash.

Colima is one of the most active volcanoes in Mexico and North America, having erupted more than 40 times since 1519.

WATCH: Colima volcano explodes with massive ash cloud.

Masaya (Nicaragua): Crater glow at Masaya volcano this morning (INETER crater webcam) According to local press articles referring to information from INETER, the volcano's activity is on the rise, with "lava being close to the surface".

Crater glow at Masaya volcano (INETER crater webcam)

The main crater of the volcano appears covered with debris from rockfalls from the crater walls, but visible incandescence, strong degassing sounds and small flames (from combusting gasses) jetting from between cracks on the floor, suggest that lava might be not far underneath and could again lead to the formation of a new lava lake, last observed in 1999.

On the other hand, seismic activity has been at low levels and not shown significant variations recently, not suggesting that significant movements of magma towards the surface have taken place.

Also, the incandescence of the vent at the main crater has been there for a number of years already.


Copahue (Chile): Ash emissions ceased about a week ago and the volcano has been relatively calm at the surface since. However, a seismic swarm occurred yesterday, sign that the unrest at the volcano is not yet over.

Copahue volcano in early December.

According to local press, the swarm contained 103 small quakes during 24 hours, composed by rock-fracturing volcano-tectonic events at 12 km distance from the main crater and at depths of near 6 km.


Veniaminof (Alaska Peninsula, USA): The Alaska Volcano Observatory lowered the volcano's alert status back to normal/green:

"Seismic activity, indicative of unrest, at Veniaminof has decreased to near background levels during the past two weeks. Minor steaming from the intracaldera cone has not been observed since November 16. As a result, AVO is lowering the Aviation Color Code to Green and the Volcano Alert Level to Normal." (AVO)

GLOBAL VOLCANISM: Fury Unleashed - Volcanoes Erupting Around The World!

May 19, 2013 - EARTH - Volcanoes are rumbling in both the Arctic and the tropics of North America, while other eruptions continue on an Italian island and in the frozen tundra of Russia.

Pavlof Volcano in eruption. View is from the southwest in Cold Bay. Lava fountain is visible near the summit, and steam and ash clouds rise from the northwest flank where a lava flow advances down the slope. (Rachel Kremer, USGS)

In Alaska, twin volcanoes threaten to unleash more of their fury. Volcano fanatics are salivating over images of Pavlof volcano’s ash and steam plume. The plume rose to approximately 20,000 above sea level and have created a diffuse plume trailing 100 miles downwind to the northeast, according to the U.S. Geological Survey’s Alaska Volcano Observatory. Pilots recently spotted lava trickling down the northwest flank of the 8,261 feet (2,518 meter) volcano. Residents of Cold Bay, 37 miles away, reported a visible glow from the volcano’s summit last night.

Nearby Cleveland volcano hasn’t erupted yet, and USGS monitoring equipment hadn’t picked up any explosions as of yesterday evening. However, the USGS warns that an eruption of blocks of stone and ash could occur with little or no warning.

USGS officials warned aviators of the dangers of the incipient eruptions and set aviation alert level to “orange.”

Thousands of miles to the south, the one of the world’s most active volcanoes, Popocatepetl, continues its activity in the Valley of Mexico. On Monday, the volcano erupted a plume of ash that settled over nearby Puebla.

Mexico’s National Disaster Prevention Center announced that they had detected two explosions on Tuesday night. The center also stated that steam recently rose approximately one mile (1.5 kilometers) above Popocatepetl. Authorities are now preparing shelters and evacuations routes in case the volcanic eruption escalates, reported the AP.

Earlier in May, a tremor from Popocatepetl lasted for 3.5 hours, reported Volcano Discovery. An eruption of steam and ash accompanied the tremor and covered the villages San Juan Tianguismanalco, San Pedro Benito Juárez and the City of Puebla in ash as the plume drifted to the southeast.

Elsewhere around the world, Stromboli volcano remains active in Italy. Observers spotted a small flow of lava from the volcano’s northeast crater, reported Volcano Discovery. Stromboli is one of the eight Aeolian Islands located north of Sicily.

In Kamchatka, a region of eastern Russia, the volcano Shiveluch produced an ash cloud that rose 15,000 feet (4.7 meters) on Wednesday, according to Volcano Discovery. The five other active volcanoes in Kanchatka have shown no changes in activity recently.  - DISCOVERY News.

GLOBAL VOLCANISM: The Global Volcano Report For May 17, 2013 - Updates On Sakurajima, Pavlof, Popocatépetl, Telica, San Cristobal, Masaya And Galeras!

May 17, 2013 - WORLDWIDE VOLCANOES - The following constitutes the new activity, unrest and ongoing reports of volcanoes across the globe.

Sakurajima (Kyushu, Japan): It seems that the latest cycle of increased activity has ended: after several days of intense activity, culminating in larger explosions on 14 and 15 May, the volcano has been "taking a rest" lasting about 2 days. This morning, only a small explosion was recorded.

Pavlof (Alaska Peninsula, USA): The eruption continues with lava fountaining at the summit that feeds a lava flow now over 100 m long and produces a continuous ash, steam, and gas plume extending downwind from the volcano for 50 to 100 km at an altitude of about 20,000 ft above sea level. This morning the cloud was carried to the southeast. Satellite images show persistent elevated surface temperatures at the summit and on the northwest flank.

MODIS hot spot data (past 7 days) for Pavlov volcano (ModVolc, Univ. Hawaii)

Seismic activity remains elevated with nearly continuous tremor recorded on the seismic network.

Popocatépetl (Central Mexico): Activity remains intense. Last night at 22:14 and this morning at 00:29 h local time, two strong explosions occurred and ejected incandescent fragments on all the volcano´s flanks to distances of up to 1,500 m from the crater. The explosions triggered an eruption plume rising at least 3 km above the volcano, drifting northeast.

Eruption from Popo this morning (CENAPRED webcam).

Telica (Nicaragua): Seismic activity has returned (for now) to relatively low levels today. This follows many small earthquake swarms that occurred during the past week.

Seismic recording from Telica this morning (TELN station, INETER).

San Cristobal (Nicaragua): Seismic activity has generally remained weak recently.

Current seismic recording from San Cristobal volcano (CRIN station, INETER).

Masaya (Nicaragua): Seismic activity has remained at normal, generally low levels during the past weeks. Occasionally, phases of weak increased tremor are visible.

Seismic recording from Masaya 16 May (MASN station, INETER).

Galeras (Colombia): A small series of ash emissions occurred in the morning of 16 May, following a weak increase in seismic activity during the past week.

Ash emissions from Galeras on 16 May (INGEOMINAS).

Complete Earthquake list (worldwide) for May 17, 2013.

- Volcano Discovery.

GLOBAL VOLCANISM: The Global Volcano Report For April 23, 2013 - Updates On Stromboli, Batu Tara, Miyake-shima, Popocatépetl, Telica, San Cristobal, Masaya And Nevado del Ruiz!

April 23, 2013 - WORLDWIDE VOLCANOES - The following constitutes the new activity, unrest and ongoing reports of volcanoes across the globe.

Thermal webcam image of the crater area of Stromboli (INGV).

Stromboli (Eolian Islands, Italy): The small lava flow issuing from the breached NE crater continues, but has not progressed much. Frequent glowing rockfalls descend the Sciara del Fuoco.

Batu Tara (Sunda Islands, Indonesia): A stronger strombolian explosion produced an ash plume rising to 5,000 ft / 1.5 km this morning, which drifted 15 nautical miles to the NW (VAAC Darwin).

Depth vs time of the recent earthquakes west of Miyake island.

Miyake-shima (Izu Islands): The earthquake swarm that started on 17 April and included a magnitude 5.6 quake has been decreasing and remained at the same depths at around 10-15 km just west off the island. This suggests that no magmatic intrusions have formed at shallower depths (so far) and the scenario of a (submarine) eruption is less likely.

View of Popocatepetl's glowing summit crater this morning.

Popocatépetl (Central Mexico): Activity continues with no significant changes: weak emissions of steam/gas/ash occur at rates of approx. once per hour, and glow at night shows that magma continues to arrive slowly in the summit crater.

Current seismic signal from Telica volcano (TELN station, INETER).

Telica (Nicaragua): Numerous small volcanic earthquakes continue at high frequency at the volcano, accompanied by continuous tremor.

Current seismic signal from San Cristobal volcano (CRIN station, INETER).

San Cristobal (Nicaragua): Numerous small volcanic earthquakes have merged into weak continuous volcanic tremor.

Current seismic signal from Masaya volcano (MASN station, INETER).

Masaya (Nicaragua): Seismic activity has generally remained low and near normal levels at the volcano over the past weeks.

Current seismic signal from Ruiz volcano (OLL station, INETER).

Nevado del Ruiz (Colombia): The frequency and size of earthquakes has diminished, but is still above normal levels, and suggests that the intrusion of fresh magma is not yet over. A volcanic-tectonic earthquake of magnitude 2.9 occurred this morning at a depth of 7.24 km NW of the Arenas crater.

The other Colombian volcanoes have not shown significant variations in activity: Weak seismic unrest continues at Machin, Cumbal and Sotara volcanoes with no surface activity. Nevado del Huila has remained in a degassing state with average low seismicity during the past weeks, while Galeras volcano produces occasional steam and ash emissions.

Complete Earthquake list (worldwide) for April 23, 2013.


- Volcano Discovery.