Volcano earthquake report for Saturday, 23 Aug 2025

Quakes detected near: Abu (31 quakes between mag 0.1-1.1), Akuseki-jima (8 quakes between mag 1.5-3.0), Akyarlar (1 quake mag 3.0), Aso (1 quake mag 1.3), Brennisteinsfjöll (5 quakes between mag 0.2-1.6), Campi Flegrei (Phlegrean Fields) (15 quakes between mag 0.1-2.4)
Canlaon (1 quake mag 1.2), Cerro Singüil (3 quakes between mag 2.1-2.6), Chiquimula Volcanic Field (1 quake mag 3.0), Clear Lake (17 quakes between mag 0.2-1.4), Coatepeque (1 quake mag 1.9), Coso (4 quakes between mag 0.3-1.1), Daisen (2 quakes between mag 0.2-1.2), El Chichón (5 quakes between mag 2.4-2.8), Eldey (1 quake mag 1.8), Fourpeaked (1 quake mag 1.3), Geureudong (1 quake mag 3.1), Hiuchi (3 quakes between mag 0.4-1.1), Irazu (1 quake mag 2.4), Kenger (1 quake mag 1.6), Klyuchevskoy (1 quake mag 1.9), Kolumbo (2 quakes between mag 1.0-1.7), Kozushima (1 quake mag 1.2), Loki-Fögrufjöll volcano (1 quake mag 1.0), Long Valley (1 quake mag 1.6), Machin (1 quake mag 3.0), Michoacán-Guanajuato (2 quakes between mag 2.7-2.9), Norikura (2 quakes between mag 0.9-1.4), Ontake-san (5 quakes between mag 0.1-1.4), Osore-yama (2 quakes between mag 0.9-1.0), Pocdol Mountains (1 quake mag 1.5), Salton Buttes (1 quake mag 1.0), Sangeang Api (1 quake mag 2.5), Santorini (1 quake mag 1.1), Sousaki (1 quake mag 1.2), Teon (1 quake mag 4.1), Tjörnes Fracture Zone (1 quake mag 1.0), To-shima (4 quakes between mag 1.2-1.7), Torfajökull (3 quakes between mag 0.9-1.1), Unzen (3 quakes between mag 0.4-1.2), White Island (2 quakes between mag 2.2-2.5), Zapatera (1 quake mag 3.5), unnamed (1 quake mag 1.8) (updated 23h50)

Note: 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.

Volcanoes with recent earthquakes above magnitude 2 or more than 10 quakes are listed below:

Abu volcano (Honshu): 31 earthquakes up to magnitude 1.1

Possible earthquake swarm: 31 earthquakes occurred near (under) the volcano during 19 hours, the last being recorded quake 4 hours ago. Hypocenter depths ranged between 28.00 and 23.30 km.
Earthquake details: (only 5 largest)
1.1 quake 37 km north of Yamaguchi, Yamaguchi, Japan, Aug 24, 2025 12:33 am (GMT +9) (3 km W)
0.9 quake Japan: Yamaguchi Pref Aug 23, 2025 07:08 pm (GMT +9) (3 km WNW)
0.9 quake Japan: Yamaguchi Pref Aug 23, 2025 10:39 am (GMT +9) (4 km WNW)
0.9 quake Japan: Yamaguchi Pref Aug 23, 2025 10:37 am (GMT +9) (3 km W)
0.8 quake Japan: Yamaguchi Pref Aug 23, 2025 12:47 pm (GMT +9) (3 km W)
All earthquakes at Abu

Akuseki-jima volcano (Ryukyu Islands): 8 earthquakes up to magnitude 3.0

8 earthquakes occurred near (under) the volcano during 17 hours, the last being recorded quake 5 hours ago. Hypocenter depths ranged between 30.00 and 0.00 km.
Earthquake details: (only 5 largest)
3.0 quake East China Sea, Kagoshima-ken, 33 km southwest of Suwanose-jima Island, Japan, Aug 24, 2025 01:19 am (GMT +9) (12 km SW)
2.7 quake East China Sea, Kagoshima-ken, 33 km southwest of Suwanose-jima Island, Japan, Aug 23, 2025 10:31 am (GMT +9) (12 km WSW)
2.6 quake East China Sea, Kagoshima-ken, 16 km southwest of Suwanose-jima Island, Japan, Aug 23, 2025 11:50 pm (GMT +9) (11 km N)
2.2 quake East China Sea, Kagoshima-ken, 37 km southwest of Suwanose-jima Island, Japan, Aug 24, 2025 01:22 am (GMT +9) (15 km SSW)
1.8 quake East China Sea, Kagoshima-ken, 22 km west of Suwanose-jima Island, Japan, Aug 23, 2025 04:06 pm (GMT +9) (18 km NNW)
All earthquakes at Akuseki-jima

Akyarlar volcano (Turkey): magnitude 3.0 earthquake

A magnitude 3.0 earthquake occurred at the volcano 8 hours ago. The quake, which might be volcanic in origin, was located at a depth of 10.00 km depth at 17 km distance SW from the volcano.
Earthquake details:
Reported seismic-like event (likely no quake): 12 km west of Kos, Dodecanese, South Aegean, Greece, Aug 23, 2025 06:30 pm (GMT +3) (17 km SW)
All earthquakes at Akyarlar

Campi Flegrei (Phlegrean Fields) volcano (Italy): 15 earthquakes up to magnitude 2.4

Possible earthquake swarm: 15 earthquakes occurred near (under) the volcano during 19 hours, the last being recorded quake 2 hours ago. Hypocenter depths ranged between 2.71 and 0.03 km.
Earthquake details: (only 5 largest)
2.4 quake 11 km west of Naples, Napoli, Campania, Italy, Aug 23, 2025 10:57 pm (GMT +2) (2 km SSE)
1.6 quake 4.8 km southeast of Pozzuoli, Napoli, Campania, Italy, Aug 23, 2025 11:00 pm (GMT +2) (1 km S)
1.6 quake 4.8 km southeast of Pozzuoli, Napoli, Campania, Italy, Aug 23, 2025 10:55 pm (GMT +2) (1 km S)
1.2 quake 3 km east of Pozzuoli, Napoli, Campania, Italy, Aug 23, 2025 04:50 am (GMT +2) (1 km NW)
0.8 quake 2.1 km east of Pozzuoli, Napoli, Campania, Italy, Aug 23, 2025 12:52 pm (GMT +2) (2 km NW)
All earthquakes at Campi Flegrei (Phlegrean Fields)

Cerro Singüil volcano (El Salvador): 3 earthquakes up to magnitude 2.6

3 earthquakes occurred near (under) the volcano during 6 hours, the last being recorded quake 13 hours ago. Hypocenter depths ranged between 9.00 and 5.00 km.
Earthquake details:
2.6 quake 25 km south of Jutiapa, Departamento de Jutiapa, Guatemala, Aug 22, 2025 11:42 pm (GMT -6) (18 km W)
2.2 quake 15 km northwest of Chalchuapa, Departamento de Santa Ana, El Salvador, Aug 22, 2025 10:25 pm (GMT -6) (16 km W)
2.1 quake 15 km north of Ahuachapan, Departamento de Ahuachapan, El Salvador, Aug 23, 2025 04:30 am (GMT -6) (16 km W)
All earthquakes at Cerro Singüil

Chiquimula Volcanic Field volcano (Guatemala): magnitude 3.0 earthquake

A magnitude 3.0 earthquake occurred at the volcano 3 hours ago. The quake, which might be volcanic in origin, was located at a depth of 10.00 km depth at 11 km distance NNW from the volcano.
Earthquake details:
Reported seismic-like event (likely no quake): 14 km north of Chiquimula, Departamento de Chiquimula, Guatemala, Aug 23, 2025 03:00 pm (GMT -6) (11 km NNW)
All earthquakes at Chiquimula Volcanic Field

Clear Lake volcano (California): 17 earthquakes up to magnitude 1.4

Possible earthquake swarm: 17 earthquakes occurred near (under) the volcano during 23 hours, the last being recorded quake 46 minutes ago. Hypocenter depths ranged between 9.23 and 1.17 km.
Earthquake details: (only 5 largest)
1.4 quake 28 mi north of Santa Rosa, Sonoma County, California, United States, Aug 22, 2025 08:04 pm (GMT -7) (16 km SSW)
1.2 quake 28 mi north of Santa Rosa, Sonoma County, California, United States, Aug 22, 2025 05:02 pm (GMT -7) (15 km SSW)
1.2 quake Lake County, 28 mi north of Santa Rosa, Sonoma County, California, United States, Aug 22, 2025 11:12 pm (GMT -7) (15 km S)
1.1 quake 28 mi north of Santa Rosa, Sonoma County, California, United States, Aug 22, 2025 05:39 pm (GMT -7) (16 km SSW)
1.0 quake 26 mi north of Santa Rosa, Sonoma County, California, United States, Aug 22, 2025 07:47 pm (GMT -7) (17 km S)
All earthquakes at Clear Lake

El Chichón volcano (Southern Mexico): 5 earthquakes up to magnitude 2.8

5 earthquakes occurred near (under) the volcano during 1 hour 48 minutes, the last being recorded quake 22 hours ago. Hypocenter depths ranged between 2.00 and 2.00 km.
Earthquake details:
2.8 quake Estado de Chiapas, 36 km southwest of Teapa, Estado de Tabasco, Mexico, Aug 22, 2025 06:55 pm (GMT -6) (0 km NE)
2.6 quake Estado de Chiapas, 36 km southwest of Teapa, Estado de Tabasco, Mexico, Aug 22, 2025 07:51 pm (GMT -6) (1 km NW)
2.5 quake Estado de Chiapas, 36 km southwest of Teapa, Estado de Tabasco, Mexico, Aug 22, 2025 08:17 pm (GMT -6) (4 km NNW)
2.4 quake Estado de Chiapas, 36 km southwest of Teapa, Estado de Tabasco, Mexico, Aug 22, 2025 06:29 pm (GMT -6) (1 km N)
2.4 quake Estado de Chiapas, 36 km southwest of Teapa, Estado de Tabasco, Mexico, Aug 22, 2025 08:06 pm (GMT -6) (0 km NW)
All earthquakes at El Chichón

Geureudong volcano (Sumatra): magnitude 3.1 earthquake

A magnitude 3.1 earthquake occurred at the volcano 14 hours ago. The quake, which might be volcanic in origin, was located at a depth of 10.00 km depth at 14 km distance SSW from the volcano.
Earthquake details:
3.1 quake Kabupaten Aceh Tengah, 72 km southwest of Lhokseumawe, Indonesia, Aug 23, 2025 04:22 pm (GMT +7) (14 km SSW)
All earthquakes at Geureudong

Irazu volcano (Costa Rica): magnitude 2.4 earthquake

A magnitude 2.4 earthquake occurred at the volcano 17 hours ago. The quake, which might be volcanic in origin, was located at a depth of 6.00 km depth at 15 km distance W from the volcano.
Earthquake details:
2.4 quake 11 km northeast of San Jose, Provincia de San Jose, Costa Rica, Aug 23, 2025 12:31 am (GMT -6) (15 km W)
All earthquakes at Irazu

Machin volcano (Colombia): magnitude 3.0 earthquake

A magnitude 3.0 earthquake occurred at the volcano 19 hours ago. The quake, which might be volcanic in origin, was located at a depth of 10.00 km depth at 6 km distance SW from the volcano.
Earthquake details:
Reported seismic-like event (likely no quake): 22 km west of Ibague, Departamento de Tolima, Colombia, Aug 23, 2025 12:07 am (GMT -5) (6 km SW)
All earthquakes at Machin

Michoacán-Guanajuato volcano (Western & Central Mexico): 2 earthquakes up to magnitude 2.9

2 earthquakes occurred near (under) the volcano during 1 hour 11 minutes, the last being recorded quake 13 hours ago. Hypocenter depths ranged between 17.50 and 16.40 km.
Earthquake details:
2.9 quake 33 km west of Uruapan, Estado de Michoacan de Ocampo, Mexico, Aug 23, 2025 04:20 am (GMT -6) (15 km SW)
2.7 quake 31 km west of Uruapan, Estado de Michoacan de Ocampo, Mexico, Aug 23, 2025 03:09 am (GMT -6) (14 km SW)
All earthquakes at Michoacán-Guanajuato

Sangeang Api volcano (Lesser Sunda Islands): magnitude 2.5 earthquake

A magnitude 2.5 earthquake occurred at the volcano 6 hours ago. The quake, which might be volcanic in origin, was located at a depth of 12.00 km depth at 14 km distance ESE from the volcano.
Earthquake details:
2.5 quake Flores Sea, 15 km east of Pulau Sangeang Island, West Nusa Tenggara, Indonesia, Aug 24, 2025 02:10 am (GMT +8) (14 km ESE)
All earthquakes at Sangeang Api

Teon volcano (Banda Sea): magnitude 4.1 earthquake

A magnitude 4.1 earthquake occurred at the volcano 12 hours ago. The quake, which might be volcanic in origin, was located at a depth of 28.00 km depth at 18 km distance E from the volcano.
Earthquake details:
4.1 quake Banda Sea, 78 km east of Pulau Damar Island, Maluku, Indonesia, Aug 23, 2025 08:21 pm (Jayapura time) (18 km E)
All earthquakes at Teon

White Island volcano (New Zealand): 2 earthquakes up to magnitude 2.5

2 earthquakes occurred near (under) the volcano during 7 hours, the last being recorded quake 14 hours ago. Hypocenter depths ranged between 12.00 and 5.00 km.
Earthquake details:
2.5 quake South Pacific Ocean, 68 km north of Whakatane, Bay of Plenty, New Zealand, Aug 23, 2025 02:50 pm (GMT +12) (17 km NNE)
2.2 quake South Pacific Ocean, 67 km north of Whakatane, Bay of Plenty, New Zealand, Aug 23, 2025 09:56 pm (GMT +12) (16 km N)
All earthquakes at White Island

Zapatera volcano (Nicaragua): magnitude 3.5 earthquake

A magnitude 3.5 earthquake occurred at the volcano 15 hours ago. The quake, which might be volcanic in origin, was located at a depth of 45.00 km depth at 11 km distance NNW from the volcano.
Earthquake details:
3.5 quake 17 km southeast of Granada, Departamento de Granada, Nicaragua, Aug 23, 2025 03:15 am (GMT -6) (11 km NNW)
All earthquakes at Zapatera
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