Volcano earthquake report for Monday, 28 September 2026

Quakes detected near: Agua (1 quake mag 2.9), Alaska Peninsula Arc at 155.4°W (2 quakes between mag 1.0-1.2), Askja (2 quakes between mag 0.3-1.4), Balut (2 quakes between mag 2.1-2.9), Bardarbunga (5 quakes between mag 0.3-1.4), Biliran (1 quake mag 2.2)
Camiguin de Babuyanes (1 quake mag 2.0), Chingo (2 quakes between mag 1.1-1.6), Clear Lake (26 quakes between mag 0.3-1.6), Conchagüita (1 quake mag 2.8), Corcovado (1 quake mag 4.4), Eldey (2 quakes between mag 0.7-1.0), Escanaba Segment (1 quake mag 3.2), Etna (3 quakes between mag 0.5-1.2), Flores (18 quakes between mag 0.9-2.7), Isarog (1 quake mag 2.4), Jan Mayen (1 quake mag 2.0), Karadağ (3 quakes between mag 1.5-2.1), Kolbeinsey Ridge (1 quake mag 3.5), Ljósufjöll (2 quakes between mag 1.1-1.5), Mayon (1 quake mag 1.6), Methana (1 quake mag 1.7), Mount Adams (5 quakes between mag 0.9-2.6), Novarupta (3 quakes between mag 0.6-2.0), Numazawa (1 quake mag 2.8), Paluweh (1 quake mag 3.2), Pocdol Mountains (1 quake mag 1.5), Santiaguito (1 quake mag 1.6), Svartsengi (1 quake mag 1.1), Tahual (1 quake mag 2.5), Tecuamburro (2 quakes between mag 1.3-2.6), Tjörnes Fracture Zone (3 quakes between mag 1.4-2.1), Torfajökull (10 quakes between mag 0.1-1.1), Trident (2 quakes between mag 0.5-1.3) (updated 17h50)\n\nNote: Earthquakes within 20 km from and at depths less than 50 km under active volcanoes are reported. The list is not complete because many volcanoes are not monitored and/or seismic data in high resolution is not available publicly.\n
Volcanoes with recent earthquakes above magnitude 2 or more than 10 quakes are listed below:

Agua volcano (Guatemala): magnitude 2.9 earthquake

A magnitude 2.9 earthquake occurred at the volcano 13 hours ago. The quake, which might be volcanic in origin, was located at a depth of 12.00 km depth at 8 km distance SSW from the volcano.
Earthquake details:
2.9 quake Departamento de Santa Rosa, 38 km southwest of Guatemala City, Guatemala, Sep 27, 2026 11:00 pm (GMT -6) (8 km SSW)
All earthquakes at Agua
Agua is a prominent 3,760 m stratovolcano beside Antigua, Guatemala. It has no recorded eruptions, while a devastating mudflow destroyed Ciudad Vieja in 1541.

Balut volcano (Mindanao): 2 earthquakes up to magnitude 2.9

2 earthquakes occurred near (under) the volcano during 22 hours, the last being recorded quake 32 minutes ago. Hypocenter depths ranged between 33.00 and 19.00 km.
Earthquake details:
2.9 quake Philippine Sea, 21 km south of Sarangani Island, Philippines, Sep 29, 2026 01:18 am (GMT +8) (16 km SSE)
2.1 quake Celebes Sea, 19 km southwest of Sarangani Island, Philippines, Sep 28, 2026 02:58 am (GMT +8) (7 km SW)
All earthquakes at Balut
Balut is an 840 m island stratovolcano south of Mindanao whose last known eruption occurred between about 2 million and 11,700 years ago. Hot springs and thermally altered ground occur on its western and southwestern flanks.

Biliran volcano (Central Philippines): magnitude 2.2 earthquake

A magnitude 2.2 earthquake occurred at the volcano 8 hours ago. The quake, which might be volcanic in origin, was located at a depth of 23.00 km depth at 18 km distance SSW from the volcano.
Earthquake details:
2.2 quake 42 km north of Ormoc, Province of Leyte, Eastern Visayas, Philippines, Sep 28, 2026 05:40 pm (GMT +8) (18 km SSW)
All earthquakes at Biliran
Biliran is a dome-rich volcanic island across a narrow strait from northern Leyte in the Philippines. Its only known historical eruption was a phreatic explosion with ash and a possible debris avalanche on 26 September 1939.

Clear Lake volcano (California): 26 earthquakes up to magnitude 1.6

Possible earthquake swarm: 26 earthquakes occurred near (under) the volcano during 21 hours, the last being recorded quake 1 hour 12 minutes ago. Hypocenter depths ranged between 15.91 and 0.26 km.
Earthquake details: (only 5 largest)
1.6 quake Sonoma County, 14 mi southwest of Clearlake, Lake County, California, United States, Sep 28, 2026 09:37 am (GMT -7) (18 km S)
1.5 quake 28 mi north of Santa Rosa, Sonoma County, California, United States, Sep 28, 2026 02:25 am (GMT -7) (17 km SSW)
1.5 quake 28 mi north of Santa Rosa, Sonoma County, California, United States, Sep 27, 2026 02:22 pm (GMT -7) (16 km SSW)
1.4 quake Lake County, 27 mi north of Santa Rosa, Sonoma County, California, United States, Sep 27, 2026 01:05 pm (GMT -7) (16 km S)
1.3 quake 28 mi north of Santa Rosa, Sonoma County, California, United States, Sep 28, 2026 12:57 am (GMT -7) (17 km SSW)
All earthquakes at Clear Lake

Conchagüita volcano (El Salvador): magnitude 2.8 earthquake

A magnitude 2.8 earthquake occurred at the volcano 10 hours ago. The quake, which might be volcanic in origin, was located at a depth of 6.00 km depth at 19 km distance WNW from the volcano.
Earthquake details:
2.8 quake 9.1 km west of La Union, Departamento de La Union, El Salvador, Sep 28, 2026 01:57 am (GMT -6) (19 km WNW)
All earthquakes at Conchagüita
Conchagüita is a 505-m-high island stratovolcano in El Salvador’s Gulf of Fonseca. Its last known eruption occurred more than about 11,700 years ago, and a reported 1892 eruption is discredited.

Corcovado volcano (Southern Chile and Argentina): magnitude 4.4 earthquake

A magnitude 4.4 earthquake occurred at the volcano 23 hours ago. The quake, which might be volcanic in origin, was located at a depth of 10.00 km depth at 18 km distance NE from the volcano.
Earthquake details:
4.4 quake Provincia de Palena, 81 km east of Quellon, Provincia de Chiloe, Region de los Lagos, Chile, Sep 27, 2026 03:55 pm (Santiago time) (18 km NE)
All earthquakes at Corcovado
Corcovado is an isolated, glacier-eroded stratovolcano in Chile, surrounded by younger cinder cones. Three prehistoric eruptions are confirmed, while reports of activity in 1834 and 1835 are uncertain.

Escanaba Segment volcano (Northern Pacific Ocean): magnitude 3.2 earthquake

A magnitude 3.2 earthquake occurred at the volcano 4 hours ago. The quake, which might be volcanic in origin, was located at a depth of 10.00 km depth at 18 km distance NNE from the volcano.
Earthquake details:
3.2 quake 275 km W of Indianola, California, Sep 28, 2026 05:30 am (GMT -8) (18 km NNE)
All earthquakes at Escanaba Segment
Escanaba Segment is a 130-km-long submarine volcanic rift off northern California. A basaltic lava flow there has been tentatively dated to about 2260 BCE.

Flores volcano (Guatemala): 18 earthquakes up to magnitude 2.7

Possible earthquake swarm: 18 earthquakes occurred near (under) the volcano during 18 hours, the last being recorded quake 5 hours ago. Hypocenter depths ranged between 11.10 and 1.30 km.
Earthquake details: (only 5 largest)
2.7 quake 24 km northeast of Cuilapa, Departamento de Santa Rosa, Guatemala, Sep 27, 2026 12:28 pm (GMT -6) (14 km WNW)
2.6 quake 18 km northeast of Cuilapa, Departamento de Santa Rosa, Guatemala, Sep 28, 2026 06:49 am (GMT -6) (18 km WNW)
2.4 quake 22 km northeast of Cuilapa, Departamento de Santa Rosa, Guatemala, Sep 28, 2026 12:49 am (GMT -6) (15 km WNW)
2.3 quake 22 km northeast of Cuilapa, Departamento de Santa Rosa, Guatemala, Sep 27, 2026 03:52 pm (GMT -6) (15 km WNW)
2.2 quake 22 km northeast of Cuilapa, Departamento de Santa Rosa, Guatemala, Sep 28, 2026 12:44 am (GMT -6) (15 km WNW)
All earthquakes at Flores
Flores, also known as Volcán Amayo, is a volcanic field about 10 km west of Jutiapa in southeastern Guatemala. Its last eruption is undated, and none are known from approximately the past 11,700 years.

Isarog volcano (Luzon Island): magnitude 2.4 earthquake

A magnitude 2.4 earthquake occurred at the volcano 15 hours ago. The quake, which might be volcanic in origin, was located at a depth of 16.00 km depth at 12 km distance NNE from the volcano.
Earthquake details:
2.4 quake 23 km east of Calabanga, Province of Camarines Sur, Bicol, Philippines, Sep 28, 2026 10:43 am (GMT +8) (12 km NNE)
All earthquakes at Isarog
Isarog is a 1,966 m stratovolcano in southeastern Luzon with a broad breached summit crater and a major debris-avalanche deposit. Its only confirmed eruptive period is dated to around 3500 BCE.

Karadağ volcano (Turkey): 3 earthquakes up to magnitude 2.1

3 earthquakes occurred near (under) the volcano during 18 minutes, the last being recorded quake 18 hours ago. Hypocenter depths ranged between 11.60 and 6.90 km.
Earthquake details:
2.1 quake 20 km north of Karaman, Karaman, Turkey, Sep 28, 2026 02:59 am (GMT +3) (12 km ESE)
1.8 quake 21 km north of Karaman, Karaman, Turkey, Sep 28, 2026 03:10 am (GMT +3) (12 km ESE)
1.5 quake 21 km north of Karaman, Karaman, Turkey, Sep 28, 2026 03:17 am (GMT +3) (14 km ESE)
All earthquakes at Karadağ

Kolbeinsey Ridge volcano (Iceland): magnitude 3.5 earthquake

A magnitude 3.5 earthquake occurred at the volcano 11 minutes ago. The quake, which might be volcanic in origin, was located at a depth of 12.20 km depth at 10 km distance WNW from the volcano.
Earthquake details:
3.5 quake 62 km north of Siglufjordur, Northeast, Iceland, Sep 28, 2026 05:38 pm (Reykjavik time) (10 km WNW)
All earthquakes at Kolbeinsey Ridge
Kolbeinsey Ridge is a submarine fissure-vent system north of Iceland, with tiny Kolbeinsey Island as its only expression above sea level. Historical eruption reports from 1372 and 1755 have uncertain locations.

Mount Adams volcano (Washington State): 5 earthquakes up to magnitude 2.6

5 earthquakes occurred near (under) the volcano during 11 hours, the last being recorded quake 7 hours ago. Hypocenter depths ranged between 1.95 and 0.09 km.
Earthquake details:
2.6 quake Skamania County, 55 mi southwest of Yakima, Yakima County, Washington, United States, Sep 27, 2026 05:12 pm (GMT -7) (3 km WNW)
1.4 quake 55 mi southwest of Yakima, Yakima County, Washington, United States, Sep 27, 2026 04:30 pm (GMT -7) (3 km NW)
1.2 quake Skamania County, 55 mi southwest of Yakima, Yakima County, Washington, United States, Sep 28, 2026 03:59 am (GMT -7) (3 km WNW)
1.1 quake 55 mi southwest of Yakima, Yakima County, Washington, United States, Sep 27, 2026 05:05 pm (GMT -7) (3 km NW)
0.9 quake 55 mi southwest of Yakima, Yakima County, Washington, United States, Sep 28, 2026 09:07 am (Universal Time) (3 km NW)
All earthquakes at Mount Adams
Mount Adams is a large stratovolcano in south-central Washington with more than 60 flank vents. Its last known eruption occurred around 950 CE, producing minor tephra and possibly a small east-flank lava flow.

Numazawa volcano (Honshu): magnitude 2.8 earthquake

A magnitude 2.8 earthquake occurred at the volcano 10 hours ago. The quake, which might be volcanic in origin, was located at a depth of 6.70 km depth at 12 km distance WSW from the volcano.
Earthquake details:
2.8 quake 46 km west of Aizu-Wakamatsu, Fukushima, Japan, Sep 28, 2026 04:24 pm (GMT +9) (12 km WSW)
All earthquakes at Numazawa
Numazawa is a Japanese shield volcano with a 1.5 × 2 km lake-filled caldera. Its only listed confirmed eruptive period was a major explosive and effusive event several thousand years ago.

Paluweh volcano (Lesser Sunda Islands): magnitude 3.2 earthquake

A magnitude 3.2 earthquake occurred at the volcano 4 hours ago. The quake, which might be volcanic in origin, was located at a depth of 13.00 km depth at 15 km distance NNW from the volcano.
Earthquake details:
3.2 quake Flores Sea, 72 km north of Ende, Kabupaten Ende, East Nusa Tenggara, Indonesia, Sep 28, 2026 10:16 pm (GMT +8) (15 km NNW)
All earthquakes at Paluweh
Paluweh is an island-forming stratovolcano north of Flores, Indonesia. Its major eruptions include a destructive, tsunami-producing event in 1928 and deadly pyroclastic flows in 2013.

Tahual volcano (Guatemala): magnitude 2.5 earthquake

A magnitude 2.5 earthquake occurred at the volcano 14 hours ago. The quake, which might be volcanic in origin, was located at a depth of 2.00 km depth at 15 km distance WNW from the volcano.
Earthquake details:
2.5 quake 20 km south of Jalapa, Departamento de Jalapa, Guatemala, Sep 27, 2026 09:52 pm (GMT -6) (15 km WNW)
All earthquakes at Tahual
Tahual is an eroded, forested stratovolcano south of Monjas in Guatemala. A cone near its northeastern base produced a short basaltic lava flow during approximately the past 11,700 years, but the date of the volcano’s last eruption is unknown.

Tecuamburro volcano (Guatemala): 2 earthquakes up to magnitude 2.6

2 earthquakes occurred near (under) the volcano during 7 minutes, the last being recorded quake 19 hours ago. Hypocenter depths ranged between 6.30 and 3.20 km.
Earthquake details:
2.6 quake 12 km southeast of Cuilapa, Departamento de Santa Rosa, Guatemala, Sep 27, 2026 05:00 pm (GMT -6) (17 km E)
1.3 quake 13 km southeast of Cuilapa, Departamento de Santa Rosa, Guatemala, Sep 27, 2026 05:07 pm (GMT -6) (18 km E)
All earthquakes at Tecuamburro
Tecuamburro is a forested stratovolcano and lava-dome complex in Guatemala. Its only dated eruption, about 2,900 years ago, formed the Laguna Ixpaco tuff ring.

Tjörnes Fracture Zone volcano (Iceland): 3 earthquakes up to magnitude 2.1

3 earthquakes occurred near (under) the volcano during 13 hours, the last being recorded quake 9 hours ago. Hypocenter depths ranged between 15.80 and 0.10 km.
Earthquake details:
2.1 quake Iceland: 32.2 km WNW of Kópasker Sep 27, 2026 07:22 pm (Reykjavik time) (15 km N)
1.6 quake Iceland: 26.2 km WNW of Kópasker Sep 27, 2026 11:47 pm (Reykjavik time) (14 km NNE)
1.4 quake Iceland: 28.0 km NE of Flatey Sep 28, 2026 08:32 am (Reykjavik time) (15 km WNW)
All earthquakes at Tjörnes Fracture Zone
The Tjörnes Fracture Zone is an offshore volcanic system north of Iceland. A poorly documented submarine eruption was reported near Manareyjar Island in 1867–1868.
https://www.volcanodiscovery.com/earthquakes-volcanoes/news/366474/Volcano-earthquake-report-2026-09-28.html