Volcano earthquake report for Friday, 23 Apr 2021

Quakes detected near: Bratan (1 quake mag 1.2), Brennisteinsfjöll (8 quakes between mag 0.1-1.7), Cabalian (3 quakes between mag 2.3-3.8), Clear Lake (28 quakes between mag 0.4-2.3), Denison (2 quakes between mag 0.5-2.1), Fagradalsfjall (8 quakes between mag 0.1-1.8)
Great Sitkin (6 quakes between mag 0.2-2.6), Gunung Semuning (Ranau caldera) (1 quake mag 1.6), Hrómundartindur (4 quakes between mag 0.3-2.0), Kilauea (1 quake mag 2.1), Krísuvík (13 quakes between mag 0.2-1.4), Long Valley (4 quakes between mag 0.3-2.1), Maunaloa (2 quakes between mag 1.2-1.5), Monte Albano (1 quake mag 1.2), Mount Rainier (1 quake mag 1.4), Nisyros (21 quakes between mag 1.7-3.6), Okataina (Tarawera) (1 quake mag 1.8), Penguin Island (1 quake mag 4.3), Reykjanes (4 quakes between mag 0.7-1.6), Sabancaya (1 quake mag 3.7), Salton Buttes (1 quake mag 1.4), Ubehebe Craters (1 quake mag 1.5) (updated 23h50)

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:

Cabalian volcano (Central Philippines): 3 earthquakes up to magnitude 3.8

3 earthquakes occurred near (under) the volcano during 7 hours, the last being recorded quake 10 hours ago. Hypocenter depths ranged between 14.0 and 2.0 km.
Earthquake details:
3.8 quake Southern Leyte, 33 km south of Abuyog, Philippines, 23 April 2021 - 03:04 PM (PST) (15 km NW)
3.6 quake 41 km northeast of Maasin, Southern Leyte, Eastern Visayas, Philippines, 23 April 2021 13:38 GMT (17 km NW)
2.3 quake 18 km east of Sogod, Southern Leyte, Eastern Visayas, Philippines, 23 April 2021 - 06:11 PM (PST) (11 km WNW)
All earthquakes at Cabalian

Clear Lake volcano (California): 28 earthquakes up to magnitude 2.3

Possible earthquake swarm: 28 earthquakes occurred near (under) the volcano during 22 hours, the last being recorded quake 1 hour 4 minutes ago. Hypocenter depths ranged between 6.3 and 1.1 km.
Earthquake details: (only 5 largest)
2.3 quake 7km WNW of Cobb, CA, USA, 23 April 2021 00:43 GMT (15 km S)
1.8 quake 7km NW of The Geysers, CA, USA, 23 April 2021 12:44 GMT (16 km S)
1.8 quake 6km NW of The Geysers, CA, USA, 23 April 2021 17:11 GMT (16 km S)
1.6 quake 6km WNW of The Geysers, CA, USA, 23 April 2021 16:26 GMT (18 km SSW)
1.5 quake 7km WNW of The Geysers, CA, USA, 23 April 2021 06:43 GMT (18 km SSW)
All earthquakes at Clear Lake

Denison volcano (Alaska Peninsula): 2 earthquakes up to magnitude 2.1

2 earthquakes occurred near (under) the volcano during 8 minutes, the last being recorded quake 16 hours ago. Hypocenter depths ranged between 4.6 and 0.0 km.
Earthquake details:
2.1 quake 91 Km N of Karluk, Alaska, USA, 23 April 2021 07:40 GMT (3 km S)
0.5 quake 92 Km N of Karluk, Alaska, USA, 23 April 2021 07:48 GMT (4 km WSW)
All earthquakes at Denison

Great Sitkin volcano (Aleutian Islands): 6 earthquakes up to magnitude 2.6

6 earthquakes occurred near (under) the volcano during 1 hour 47 minutes, the last being recorded quake 18 hours ago. Hypocenter depths ranged between 10.2 and 8.7 km.
Earthquake details: (only 5 largest)
2.6 quake 36 Km NE of Adak, Alaska, USA, 23 April 2021 03:50 GMT (4 km WSW)
2.2 quake 32 Km NE of Adak, Alaska, USA, 23 April 2021 03:37 GMT (6 km W)
0.5 quake 34 Km NE of Adak, Alaska, USA, 23 April 2021 04:02 GMT (9 km W)
0.5 quake 34 Km NE of Adak, Alaska, USA, 23 April 2021 03:38 GMT (9 km W)
0.3 quake 35 Km NE of Adak, Alaska, USA, 23 April 2021 05:24 GMT (7 km W)
All earthquakes at Great Sitkin

Kilauea volcano (Hawai'i (Big Island)): magnitude 2.1 earthquake

A magnitude 2.1 earthquake occurred at the volcano 8 hours ago. The quake, which might be volcanic in origin, was located at a depth of 2.0 km depth at 4 km distance S from the volcano.
Earthquake details:
2.1 quake Island of Hawaii, Hawaii, USA, 23 April 2021 15:55 GMT (4 km S)
All earthquakes at Kilauea

Krísuvík volcano (Reykjanes Peninsula, Iceland): 13 earthquakes up to magnitude 1.4

Possible earthquake swarm: 13 earthquakes occurred near (under) the volcano during 14 hours, the last being recorded quake 9 hours ago. Hypocenter depths ranged between 8.2 and 1.3 km.
Earthquake details: (only 5 largest)
1.4 quake 1.6 Km SSW of Keilir, Iceland, 23 April 2021 01:07 GMT (4 km W)
1.1 quake 1.9 Km SSW of Keilir, Iceland, 23 April 2021 01:15 GMT (4 km W)
1.0 quake 4.3 Km ENE of Keilir, Iceland, 23 April 2021 06:33 GMT (2 km NNE)
0.9 quake 2.9 Km SSW of Keilir, Iceland, 23 April 2021 03:14 GMT (5 km WSW)
0.8 quake 4.2 Km N of Krýsuvík, Iceland, 23 April 2021 10:09 GMT (1 km ESE)
All earthquakes at Krísuvík

Long Valley volcano (California): 4 earthquakes up to magnitude 2.1

4 earthquakes occurred near (under) the volcano during 11 hours, the last being recorded quake 4 hours ago. Hypocenter depths ranged between 9.7 and 4.0 km.
Earthquake details:
2.1 quake 13km W of Toms Place, CA, USA, 23 April 2021 19:30 GMT (15 km SSE)
0.6 quake 12km W of Toms Place, CA, USA, 23 April 2021 20:13 GMT (18 km SSE)
0.5 quake 11km W of Toms Place, CA, USA, 23 April 2021 09:34 GMT (15 km SSE)
0.3 quake 13km W of Toms Place, CA, USA, 23 April 2021 11:05 GMT (17 km SSE)
All earthquakes at Long Valley

Nisyros volcano (Greece): 21 earthquakes up to magnitude 3.6

Possible earthquake swarm: 21 earthquakes occurred near (under) the volcano during 22 hours, the last being recorded quake 1 hour 44 minutes ago. Hypocenter depths ranged between 18.1 and 2.0 km.
Earthquake details: (only 5 largest)
3.6 quake Aegean Sea, 50 km south of Kos Town, Dodecanese, South Aegean, Greece, 23 April 2021 12:19 GMT (16 km S)
3.3 quake Aegean Sea, 53 km south of Kos Town, Dodecanese, South Aegean, Greece, 23 April 2021 04:46 GMT (17 km S)
3.0 quake Aegean Sea, 53 km south of Kos Town, Dodecanese, South Aegean, Greece, 23 April 2021 06:13 GMT (15 km S)
2.9 quake Aegean Sea, 56 km south of Kos Town, Dodecanese, South Aegean, Greece, 23 April 2021 02:44 GMT (14 km S)
2.9 quake Aegean Sea, 46 km south of Kos Town, Dodecanese, South Aegean, Greece, 23 April 2021 15:31 GMT (10 km S)
All earthquakes at Nisyros

Penguin Island volcano (Antarctica): magnitude 4.3 earthquake

A magnitude 4.3 earthquake occurred at the volcano 6 hours ago. The quake, which might be volcanic in origin, was located at a depth of 5.0 km depth at 12 km distance SW from the volcano.
Earthquake details:
4.3 quake South Atlantic Ocean, Antarctica, 23 Apr 3:12 pm (GMT -3) (12 km SW)
All earthquakes at Penguin Island

Sabancaya volcano (Peru): magnitude 3.7 earthquake

A magnitude 3.7 earthquake occurred at the volcano 15 hours ago. The quake, which might be volcanic in origin, was located at a depth of 11.0 km depth at 15 km distance NNW from the volcano.
Earthquake details:
3.7 quake Provincia de Caylloma, 91 km northwest of Arequipa, Peru, 23 April 2021 08:59 GMT (15 km NNW)
All earthquakes at Sabancaya