Volcanic activity worldwide 26 Jul 2023: Santiaguito volcano, Fuego, Semeru, Ibu, Dempo, Reventador,…

Map of today’s active volcanoes

Ebeko (Paramushir Island): (25 Jul) Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: ERUPTION AT 20230725/1712Z FL140 EXTD SE REPORTED OBS VA DTG:25/2050Z

Ibu (Halmahera, Indonesia): (26 Jul) Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: VONA STATE ERUPTION TO FL080 AT 20/0211Z OBS VA DTG:26/0210Z

Semeru (East Java, Indonesia): (26 Jul) Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 14000 ft (4300 m) altitude or flight level 140 .
The full report is as follows: VA TO FL 140 OBS AT 25/2330Z MOV W OBS VA DTG:25/2330Z to 14000 ft (4300 m)

Dempo (Sumatra): Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: VA ERUPTION BASED ON SEISMOGRAM OBS VA DTG:26/0847Z
…26 Jul:
A new explosion occurred from the volcano in the evening of 25 July.
At 21:15 local time, the PVMBG surveillance camera detected a dense white-to-grey ash plume drifting S-SW of the volcano. Emissions of ash reached 17,000 ft (5,200 m) altitude.
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The local volcano observatory reported a seismic signal with a maximum amplitude of 35 mm and a duration of 204 seconds.
People are advised to avoid a 1 km radius from the volcano and a 2 km zone to the northern sector.

Shishaldin (Aleutian Islands, Alaska): Another phase of intense activity is occurring at the volcano at the time of this update.
The AVO reported continuing low-level ash emissions to about 15,000 ft (6 km) dissipating E-NE, detected in a satellite image.
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This founds in a four-hour elevated tremor and increase in surface temperatures as a precursor of the eruptive stage. Explosion signals have been detected in infrasound data at 02:00 local time.
The AVO continues: „The National Weather Service has issued a SIGMET for this ash cloud, and a Marine Weather Statement has been issued for possible trace ash on marine waters NE of the volcano.“

Trident (United States, Alaska Peninsula): (26 Jul) The Alaska Volcano Observatory (AVO) reported that a significant increase in low-frequency earthquakes (both shallow and deep-level earthquakes) started to develop in the region of Katmai volcanic cluster since May this year.
The shallow earthquake swarm is currently located 4 km north of Trident volcano at 5 km depth. Deep events are distributed beneath the area of Trident and Novarupta volcanoes at depths between 30 and 35 km. These types of earthquakes often suggest an elevated flux of magma under the surface accompanied by long-lasting of continuous tremor.
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The seismic activity at Trident volcanic complex has continued at fluctuated levels since August 2022. In November 2022, the activity escalated and consisted of shallow earthquakes less than 5 mi (8 km) below sea level. Most quakes were less than magnitude 1, but dozens of magnitude 2 and 3 earthquakes have occurred. The earthquake rate averaged between 10 to 20 daily earthquakes, occasionally reaching rates several times higher. The largest event took place on 20 November with a magnitude M 4.6. Since early January, earthquakes have become more intense at an average rate of ten per day. In late February 2023, depths of quakes were mostly deep in the beginning, about 25 km, but became rapidly shallower at a depth approx. 5 km beneath the volcano over the following four days.
Following the elevated activity, the AVO volcano observatory raised the alert status to „yellow“ in February and still remains valid so far.

Santiaguito (Guatemala): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 15000 ft (4600 m) altitude or flight level 150 .
The full report is as follows: OCNL VA EMS MOVG W to 15000 ft (4600 m)

Fuego (Guatemala): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 15000 ft (4600 m) altitude or flight level 150 .
The full report is as follows: VA OBS MOVG W to 15000 ft (4600 m)

Nevado del Ruiz (Colombia): (25 Jul) Volcanic Ash Advisory Center Washington (VAAC) issued the following report: NO RCNT VA OBS

Sangay (Ecuador): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 20000 ft (6100 m) altitude or flight level 200 .
The full report is as follows: CONS VA EMS to 20000 ft (6100 m)

Reventador (Ecuador): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 15000 ft (4600 m) altitude or flight level 150 .
The full report is as follows: OCNL VA EMS OBSD to 15000 ft (4600 m)

Sabancaya (Peru): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Buenos Aires warned about a volcanic ash plume that rose up to estimated 24000 ft (7300 m) altitude or flight level 240 and is moving at 20 kts in NE direction.
The full report is as follows: continuous ash emissions to 24000 ft (7300 m)

Ubinas (Peru): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Buenos Aires warned about a volcanic ash plume that rose up to estimated 24000 ft (7300 m) altitude or flight level 240 and is moving at 20 kts in NE direction.
The full report is as follows: INTERMITTENT EMISSIONS to 24000 ft (7300 m)

Erta Ale (Danakil depression, Ethiopia): (26 Jul) Yet another intense effusive phase showed up in the southern pit crater of the volcano over the past three days.
As reported by our expedition leader, geologist and local guide, Enku Mulugeta from VolcanoDiscovery Ethiopia, a new surge of magma transfer arrived in the lava lake.
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Vigorous lava spattering has been forming the already sizeable hornito, located on the northwestern edge of the crater. This suggests that the flux of magma rising within the volcano has been significant. Hornito is typically described as „new volcano“ and is considered to be hawaiian-type phenomena, volcanic feature forming when part of juvenile, plastic lava fragments, flowing within lava tube and/or under lava lake surface, escapes through and solidifies around vent opening due to strong degassing.
It has been three days now since the southern pit crater rim has been overflowed by emissions of incandescent, fluid lava due to its relatively high discharge rate.

Piton de la Fournaise (La Réunion): (26 Jul) The effusive eruption at the volcano continues at reduced levels.
The activity within the steep-sided spatter cone, which has been constructed above the main SE fissure vent, decreased in both lava spattering and lava flows associated with a minor degassing. The cone reaches a height of about 30 meters now.
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Emissions of lava continue to travel directly into lava tubes and are essentially remain hidden from view in the vicinity of the volcano, it emerges somewhere downslope at an altitude of 1300 meters. The lava flow front remains about 1.8 km from the main road and appears to stopped or at least waned its advance since 5 July. Based on local weather conditions yesterday, volcanologists evaluated only one lava flow to detect the current lava flow discharge rate, it is estimated to be about 1.8 m3/s (25 July).
The seismic activity remains low in general.

Volcano Activity Summary for 26 Jul 2023:

The eruption from Dempo volcano yesterday (image: PVMBG)