Volcano earthquake report for Monday, 30 Aug 2021
World map showing volcanoes with shallow (less than 20 km) earthquakes within 20 km radius during the past 24 hours on 30 Aug 2021 Number in brackets indicate nr of quakes.

Quakes detected near: Akagi (1 quake mag 3.6), Clear Lake (18 quakes between mag 0.5-2.1), Coso (8 quakes between mag 0.7-1.9), Don Joao de Castro Bank (1 quake mag 2.4), Fagradalsfjall (2 quakes between mag 0.6-1.2), Grímsnes (3 quakes between mag 0.6-1.0)
Grímsvötn (2 quakes between mag 1.0-1.4), Herdubreid (3 quakes between mag 0.5-1.0), Katla (4 quakes between mag 0.5-2.1), Kilauea (54 quakes between mag 0.3-3.7), Krísuvík (2 quakes between mag 0.7-1.0), Kuju (1 quake mag 3.5), Miravalles (1 quake mag 2.3), Montagu Island (1 quake mag 3.0), Nisyros (1 quake mag 1.9), Ruapehu (1 quake mag 1.1), Spurr (2 quakes between mag 1.3-2.0), Taupo (1 quake mag 3.0), Tenorio (1 quake mag 3.3), Theistareykjarbunga (1 quake mag 1.0), Tjörnes Fracture Zone (1 quake mag 1.4), Ubehebe Craters (1 quake mag 1.4) (updated 20h50)

Note: Earthquakes within 20 km from and at depths less than 20 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:


Akagi volcano (Honshu): magnitude 3.6 earthquake

A magnitude 3.6 earthquake occurred at the volcano 9 hours ago. The quake, which might be volcanic in origin, was located at a depth of 7.8 km depth at 19 km distance N from the volcano.
Earthquake details:
3.6 quake Tone-gun, 37 km north of Maebashi, Gunma, Japan, Aug 30, 2021 8:39 pm (GMT +9) (19 km N)All earthquakes at Akagi

Clear Lake volcano (California): 18 earthquakes up to magnitude 2.1

Possible earthquake swarm: 18 earthquakes occurred near (under) the volcano during 23 hours, the last being recorded quake 24 minutes ago. Hypocenter depths ranged between 3.3 and 0.0 km.
Earthquake details: (only 5 largest)
2.1 quake 7km NW of The Geysers, CA, Aug 30, 2021 9:27 am (GMT -7) (16 km S)2.0 quake 5km NW of The Geysers, CA, Aug 29, 2021 10:36 pm (GMT -7) (18 km S)1.6 quake 3km WNW of Cobb, CA, Aug 29, 2021 3:30 pm (GMT -7) (16 km S)1.4 quake 3km WNW of Cobb, CA, Aug 30, 2021 5:53 am (GMT -7) (15 km S)1.3 quake 6km WNW of Cobb, CA, Aug 30, 2021 11:36 am (GMT -7) (15 km S)All earthquakes at Clear Lake

Don Joao de Castro Bank volcano (Azores): magnitude 2.4 earthquake

A magnitude 2.4 earthquake occurred at the volcano 10 hours ago. The quake, which might be volcanic in origin, was located at a depth of 0 km depth at 12 km distance SSE from the volcano.
Earthquake details:
2.4 quake North Atlantic Ocean, 91 km northwest of Ponta Delgada, Azoren, Portugal, Aug 30, 2021 10:31 am (GMT +0) (12 km SSE)All earthquakes at Don Joao de Castro Bank

Katla volcano (Iceland): 4 earthquakes up to magnitude 2.1

4 earthquakes occurred near (under) the volcano during 31 minutes, the last being recorded quake 11 hours ago. Hypocenter depths ranged between 1.1 and 0.1 km.
Earthquake details:
2.1 quake Iceland: 5.5 Km NE of Goðabunga Aug 30, 2021 9:26 am (GMT +0) (7 km NW)1.1 quake Iceland: 3.8 Km ENE of Goðabunga Aug 30, 2021 9:26 am (GMT +0) (6 km WNW)0.6 quake Iceland: 6.9 Km N of Hábunga Aug 30, 2021 9:56 am (GMT +0) (1 km NW)0.5 quake Iceland: 6.4 Km N of Hábunga Aug 30, 2021 9:57 am (GMT +0) (1 km WNW)All earthquakes at Katla

Kilauea volcano (Hawai'i (Big Island)): 54 earthquakes up to magnitude 3.7

Possible earthquake swarm: 54 earthquakes occurred near (under) the volcano during 23 hours, the last being recorded quake 33 minutes ago. Hypocenter depths ranged between 7.8 and 0.1 km.
Earthquake details: (only 5 largest)
3.7 quake 28 mi south of Hilo, Hawaii County, USA, Aug 29, 2021 2:16 pm (GMT -10) (19 km ESE)2.4 quake 26 mi southwest of Hilo, Hawaii County, USA, Aug 30, 2021 10:17 am (GMT -10) (1 km S)2.4 quake 12 Km SW of Volcano, Hawaii, Aug 29, 2021 5:36 pm (GMT -10) (6 km SSW)2.0 quake 5 Km SW of Volcano, Hawaii, Aug 29, 2021 7:50 pm (GMT -10) (1 km ESE)1.9 quake 13 Km SW of Volcano, Hawaii, Aug 30, 2021 2:14 am (GMT -10) (7 km SSW)All earthquakes at Kilauea

Kuju volcano (Kyushu): magnitude 3.5 earthquake

A magnitude 3.5 earthquake occurred at the volcano 19 hours ago. The quake, which might be volcanic in origin, was located at a depth of 9.4 km depth at 9 km distance WSW from the volcano.
Earthquake details:
3.5 quake Aso-gun, Kumamoto, 45 km southwest of Ōita, Oita, Japan, Aug 30, 2021 11:15 am (GMT +9) (9 km WSW)All earthquakes at Kuju

Miravalles volcano (Costa Rica): magnitude 2.3 earthquake

A magnitude 2.3 earthquake occurred at the volcano 4 hours ago. The quake, which might be volcanic in origin, was located at a depth of 3.0 km depth at 11 km distance SW from the volcano.
Earthquake details:
2.3 quake Bagaces, 25 km east of Liberia, Provincia de Guanacaste, Costa Rica, Aug 30, 2021 10:24 am (GMT -6) (11 km SW)All earthquakes at Miravalles

Montagu Island volcano (South Sandwich Islands): magnitude 3.0 earthquake

A magnitude 3.0 earthquake occurred at the volcano 22 hours ago. The quake, which might be volcanic in origin, was located at a depth of 10.0 km depth at 5 km distance SSW from the volcano.
Earthquake details:
Reported seismic-like event (likely no quake): South Georgia & South Sandwich Islands Aug 29, 2021 8:22 pm (GMT -2) (5 km SSW)All earthquakes at Montagu Island

Taupo volcano (New Zealand): magnitude 3.0 earthquake

A magnitude 3.0 earthquake occurred at the volcano 21 hours ago. The quake, which might be volcanic in origin, was located at a depth of 10.0 km depth at 17 km distance NNE from the volcano.
Earthquake details:
Reported seismic-like event (likely no quake): 1.1 km east of Taupo, Waikato, New Zealand, Aug 30, 2021 11:27 am (GMT +12) (17 km NNE)All earthquakes at Taupo

Tenorio volcano (Costa Rica): magnitude 3.3 earthquake

A magnitude 3.3 earthquake occurred at the volcano 15 hours ago. The quake, which might be volcanic in origin, was located at a depth of 5.0 km depth at 2 km distance SE from the volcano.
Earthquake details:
3.3 quake 28 km north of Canas, Cañas, Provincia de Guanacaste, Costa Rica, Aug 30, 2021 12:09 am (GMT -6) (2 km SE)All earthquakes at Tenorio
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