Volcano earthquake report for Wednesday, 21 Apr 2021

Quakes detected near: Banua Wuhu (1 quake mag 3.4), Bardarbunga (5 quakes between mag 0.7-1.6), Clear Lake (23 quakes between mag 0.1-1.2), Coso (10 quakes between mag 0.5-1.9), Eyafjallajökull (1 quake mag 1.0), Fagradalsfjall (35 quakes between mag 0.2-2.1)
Gunung Semuning (Ranau caldera) (1 quake mag 2.5), Hrómundartindur (4 quakes between mag 0.1-1.4), Izu-Tobu (5 quakes between mag 2.7-3.7), Katmai (1 quake mag 1.1), Kilauea (1 quake mag 2.1), Krísuvík (8 quakes between mag 0.1-1.8), Las Pilas (1 quake mag 2.0), Liamuiga (1 quake mag 3.0), Maroa (1 quake mag 2.3), Maunaloa (4 quakes between mag 0.9-2.4), Methana (1 quake mag 1.5), Nisyros (21 quakes between mag 1.5-3.9), Oshima (1 quake mag 2.5), Reykjanes (26 quakes between mag 0.1-2.8), Sabancaya (1 quake mag 3.7), Tatun Group (1 quake mag 3.0), Tjörnes Fracture Zone (4 quakes between mag 0.9-1.3), Toba (1 quake mag 2.1), Torfajökull (2 quakes between mag 1.0-2.2), Tungnafellsjökull (3 quakes between mag 0.7-1.4) (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:

Banua Wuhu volcano (Sulawesi & Sangihe Islands): magnitude 3.4 earthquake

A magnitude 3.4 earthquake occurred at the volcano 4 hours ago. The quake, which might be volcanic in origin, was located at a depth of 10.0 km depth at 14 km distance NNW from the volcano.
Earthquake details:
3.4 quake Mindanao Sea, 209 km north of Manado, North Sulawesi, Indonesia, 21 April 2021 20:03 GMT (14 km NNW)
All earthquakes at Banua Wuhu

Clear Lake volcano (California): 23 earthquakes up to magnitude 1.2

Possible earthquake swarm: 23 earthquakes occurred near (under) the volcano during 23 hours, the last being recorded quake 39 minutes ago. Hypocenter depths ranged between 4.3 and 0.9 km.
Earthquake details: (only 5 largest)
1.2 quake 8km NW of The Geysers, CA, USA, 21 April 2021 05:03 GMT (16 km SSW)
1.2 quake 7km NW of The Geysers, CA, USA, 21 April 2021 04:40 GMT (16 km S)
1.1 quake 8km WNW of Cobb, CA, USA, 21 April 2021 08:02 GMT (14 km SSW)
1.0 quake 8km NW of The Geysers, CA, USA, 21 April 2021 10:05 GMT (16 km SSW)
0.9 quake 7km NW of The Geysers, CA, USA, 21 April 2021 23:09 GMT (17 km SSW)
All earthquakes at Clear Lake

Fagradalsfjall volcano (Reykjanes Peninsula, Iceland): 35 earthquakes up to magnitude 2.1

Possible earthquake swarm: 35 earthquakes occurred near (under) the volcano during 18 hours, the last being recorded quake 6 hours ago. Hypocenter depths ranged between 6.5 and 0.0 km.
Earthquake details: (only 5 largest)
2.1 quake 5.7 Km NNE of Grindavík, Iceland, 21 April 2021 13:30 GMT (6 km WSW)
1.9 quake 5.3 Km NNE of Grindavík, Iceland, 21 April 2021 01:10 GMT (6 km WSW)
1.7 quake 5.0 Km NNE of Grindavík, Iceland, 21 April 2021 09:22 GMT (6 km WSW)
1.5 quake 5.8 Km WSW of Fagradalsfjall, Iceland, 21 April 2021 17:46 GMT (6 km W)
1.2 quake 5.1 Km NNE of Grindavík, Iceland, 21 April 2021 00:30 GMT (6 km WSW)
All earthquakes at Fagradalsfjall

Gunung Semuning (Ranau caldera) volcano (Sumatra): magnitude 2.5 earthquake

A magnitude 2.5 earthquake occurred at the volcano 2 hours ago. The quake, which might be volcanic in origin, was located at a depth of 10.0 km depth at 3 km distance SW from the volcano.
Earthquake details:
2.5 quake Lampung, 93 km south of Baturaja, South Sumatra, Indonesia, 21 April 2021 21:47 GMT (3 km SW)
All earthquakes at Gunung Semuning (Ranau caldera)

Izu-Tobu volcano (Honshu): 5 earthquakes up to magnitude 3.7

5 earthquakes occurred near (under) the volcano during 3 hours, the last being recorded quake 9 hours ago. Hypocenter depths ranged between 12.2 and 5.5 km.
Earthquake details:
3.7 quake North Pacific Ocean, 23 km southeast of Itō, Shizuoka, Japan, Apr 21, 2021 21:29:50.07 (16 km SE)
3.1 quake North Pacific Ocean, 22 km southeast of Itō, Shizuoka, Japan, Apr 21, 2021 20:55:21.38 (16 km SE)
2.9 quake North Pacific Ocean, 23 km southeast of Itō, Shizuoka, Japan, Apr 21, 2021 22:07:38.87 (16 km SE)
2.9 quake North Pacific Ocean, 22 km southeast of Itō, Shizuoka, Japan, Apr 21, 2021 20:46:50.41 (15 km SE)
2.7 quake North Pacific Ocean, 23 km southeast of Itō, Shizuoka, Japan, Apr 21, 2021 23:20:08.20 (17 km SE)
All earthquakes at Izu-Tobu

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

A magnitude 2.1 earthquake occurred at the volcano 12 hours ago. The quake, which might be volcanic in origin, was located at a depth of 6.5 km depth at 17 km distance WNW from the volcano.
Earthquake details:
2.1 quake 21 Km WNW of Volcano, Hawaii, USA, 21 April 2021 12:15 GMT (17 km WNW)
All earthquakes at Kilauea

Liamuiga volcano (Caribbean): magnitude 3.0 earthquake

A magnitude 3.0 earthquake occurred at the volcano 4 hours ago. The quake, which might be volcanic in origin, was located at a depth of 10.0 km depth at 14 km distance ESE from the volcano.
Earthquake details:
Unconfirmed quake reported: Near Basseterre, Saint George Basseterre, St. Kitts & Nevis, 21 April 2021 19:39 GMT (14 km ESE)
All earthquakes at Liamuiga

Maroa volcano (New Zealand): magnitude 2.3 earthquake

A magnitude 2.3 earthquake occurred at the volcano 20 hours ago. The quake, which might be volcanic in origin, was located at a depth of 1.8 km depth at 16 km distance SSE from the volcano.
Earthquake details:
2.3 quake Rotorua District, Bay of Plenty, 17 km northeast of Taupo, Waikato, New Zealand, 21 April 2021 04:04 GMT (16 km SSE)
All earthquakes at Maroa

Maunaloa volcano (Hawai'i (Big Island)): 4 earthquakes up to magnitude 2.4

4 earthquakes occurred near (under) the volcano during 15 hours, the last being recorded quake 3 hours ago. Hypocenter depths ranged between 8.0 and 0.2 km.
Earthquake details:
2.4 quake 41 mi southwest of Hilo, Hawaii County, USA, 21 April 2021 05:51 GMT (5 km SSW)
2.3 quake 28 Km ENE of Honaunau-Napoopoo, Hawaii, USA, 21 April 2021 20:54 GMT (9 km N)
1.1 quake 35 Km ENE of Honaunau-Napoopoo, Hawaii, USA, 21 April 2021 16:21 GMT (13 km NNE)
0.9 quake 22 Km E of Honaunau-Napoopoo, Hawaii, USA, 21 April 2021 12:42 GMT (5 km WNW)
All earthquakes at Maunaloa

Nisyros volcano (Greece): 21 earthquakes up to magnitude 3.9

Possible earthquake swarm: 21 earthquakes occurred near (under) the volcano during 23 hours, the last being recorded quake 37 minutes ago. Hypocenter depths ranged between 19.8 and 5.0 km.
Earthquake details: (only 5 largest)
3.9 quake Aegean Sea, 49 km south of Kos Town, Dodecanese, South Aegean, Greece, 21 Apr 7:07 pm (GMT +3) (13 km S)
3.1 quake Aegean Sea, 53 km south of Kos Town, Dodecanese, South Aegean, Greece, 21 April 2021 22:38 GMT (17 km S)
3.0 quake Aegean Sea, 59 km south of Kos Town, Dodecanese, South Aegean, Greece, 21 April 2021 01:12 GMT (16 km SSW)
2.7 quake Aegean Sea, 52 km south of Kos Town, Dodecanese, South Aegean, Greece, 21 April 2021 05:07 GMT (15 km S)
2.6 quake Aegean Sea, 52 km south of Kos Town, Dodecanese, South Aegean, Greece, 21 April 2021 03:51 GMT (17 km S)
All earthquakes at Nisyros

Oshima volcano (Izu Islands): magnitude 2.5 earthquake

A magnitude 2.5 earthquake occurred at the volcano 9 hours ago. The quake, which might be volcanic in origin, was located at a depth of 4.1 km depth at 17 km distance WNW from the volcano.
Earthquake details:
2.5 quake North Pacific Ocean, 24 km southeast of Itō, Shizuoka, Japan, Apr 21, 2021 23:28:04.68 (17 km WNW)
All earthquakes at Oshima

Reykjanes volcano (Reykjanes Peninsula, Iceland): 26 earthquakes up to magnitude 2.8

Possible earthquake swarm: 26 earthquakes occurred near (under) the volcano during 18 hours, the last being recorded quake 5 hours ago. Hypocenter depths ranged between 13.3 and 2.3 km.
Earthquake details: (only 5 largest)
2.8 quake 3.9 Km N of Grindavík, Iceland, 21 April 2021 05:38 GMT (4 km ESE)
2.8 quake 4.3 Km NNE of Grindavík, Iceland, 21 April 2021 14:27 GMT (6 km ESE)
2.6 quake 4.3 Km NNE of Grindavík, Iceland, 21 April 2021 13:13 GMT (6 km ESE)
2.2 quake 4.7 Km NNE of Grindavík, Iceland, 21 April 2021 13:32 GMT (6 km ESE)
2.1 quake 4.2 Km NNE of Grindavík, Iceland, 21 April 2021 13:36 GMT (6 km ESE)
All earthquakes at Reykjanes

Sabancaya volcano (Peru): magnitude 3.7 earthquake

A magnitude 3.7 earthquake occurred at the volcano 11 hours ago. The quake, which might be volcanic in origin, was located at a depth of 9.0 km depth at 15 km distance NNE from the volcano.
Earthquake details:
3.7 quake Provincia de Caylloma, 88 km north of Arequipa, Peru, 21 April 2021 13:19 GMT (15 km NNE)
All earthquakes at Sabancaya

Tatun Group volcano (Taiwan): magnitude 3.0 earthquake

A magnitude 3.0 earthquake occurred at the volcano 13 hours ago. The quake, which might be volcanic in origin, was located at a depth of 10.0 km depth at 15 km distance S from the volcano.
Earthquake details:
Unconfirmed quake reported: Near Taipei, Taiwan, Taiwan, 21 April 2021 10:57 GMT (15 km S)
All earthquakes at Tatun Group

Toba volcano (Sumatra): magnitude 2.1 earthquake

A magnitude 2.1 earthquake occurred at the volcano 16 hours ago. The quake, which might be volcanic in origin, was located at a depth of 10.0 km depth at 10 km distance NNE from the volcano.
Earthquake details:
2.1 quake 64 km south of Pematangsiantar, North Sumatra, Indonesia, 21 April 2021 08:06 GMT (10 km NNE)
All earthquakes at Toba

Torfajökull volcano (Iceland): 2 earthquakes up to magnitude 2.2

2 earthquakes occurred near (under) the volcano during 52 seconds, the last being recorded quake 1 hour 39 minutes ago. Hypocenter depths ranged between 5.0 and 1.1 km.
Earthquake details:
2.2 quake 9.8 Km NNW of Álftavatn, Iceland, 21 April 2021 22:09 GMT (6 km WNW)
1.0 quake 9.5 Km NNW of Álftavatn, Iceland, 21 April 2021 22:10 GMT (5 km W)
All earthquakes at Torfajökull