Volcano earthquake report for Monday, 18 Dec 2023

Quakes detected near: Apaneca Range (2 quakes between mag 2.2-2.4), Askja (4 quakes between mag 0.2-2.0), Bardarbunga (2 quakes between mag 0.5-1.5), Clear Lake (20 quakes between mag 0.4-2.0), Coso (2 quakes between mag 1.3-2.5), Eldey (8 quakes between mag 0.6-2.1)
Etna (1 quake mag 3.0), Fagradalsfjall (186 quakes between mag 0.1-4.2), Grímsvötn (2 quakes between mag 0.9-2.1), Harra of Arhab (1 quake mag 3.0), Hengill (12 quakes between mag 0.2-1.8), Hofsjökull volcano (1 quake mag 1.9), Hrómundartindur (4 quakes between mag 0.2-1.1), Irazu (1 quake mag 2.3), Jan Mayen (1 quake mag 1.7), Katla (3 quakes between mag 0.7-1.4), Kilauea (8 quakes between mag 0.7-2.6), Krísuvík (6 quakes between mag 0.1-1.0), Maroa (1 quake mag 1.5), Ragang (1 quake mag 2.4), Raung (1 quake mag 2.6), Reykjanes (103 quakes between mag 0.1-4.1), Rincón de la Vieja (1 quake mag 3.4), Salton Buttes (1 quake mag 1.4), San Diego (1 quake mag 2.4), Santorini (1 quake mag 2.0), Taupo (1 quake mag 1.1), Terceira (1 quake mag 2.5), Tjörnes Fracture Zone (1 quake mag 1.0) (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:

Apaneca Range volcano (El Salvador): 2 earthquakes up to magnitude 2.4

2 earthquakes occurred near (under) the volcano during 30 minutes, the last being recorded quake 11 hours ago. Hypocenter depths ranged between 7.0 and 5.0 km.
Earthquake details:
2.4 quake 5.5 km east of Ahuachapan, Ahuachapán, Departamento de Ahuachapan, El Salvador, Dec 18, 2023 06:17 am (El Salvador time) (2 km NW)
2.2 quake 7.4 km east of Ahuachapan, Ahuachapán, Departamento de Ahuachapan, El Salvador, Dec 18, 2023 06:48 am (El Salvador time) (2 km NNE)
All earthquakes at Apaneca Range

Clear Lake volcano (California): 20 earthquakes up to magnitude 2.0

Possible earthquake swarm: 20 earthquakes occurred near (under) the volcano during 21 hours, the last being recorded quake 56 minutes ago. Hypocenter depths ranged between 8.4 and 0.8 km.
Earthquake details: (only 5 largest)
2.0 quake Sonoma County, 13 mi southwest of Clearlake, Lake County, California, USA, Dec 18, 2023 08:18 am (Los Angeles time) (16 km SSW)
1.5 quake 28 mi north of Santa Rosa, Sonoma County, California, USA, Dec 18, 2023 12:21 pm (Los Angeles time) (16 km SSW)
1.4 quake 27 mi north of Santa Rosa, Sonoma County, California, USA, Dec 17, 2023 06:44 pm (Los Angeles time) (16 km SSW)
1.3 quake 27 mi north of Santa Rosa, Sonoma County, California, USA, Dec 18, 2023 03:54 pm (Los Angeles time) (16 km SSW)
1.3 quake 26 mi north of Santa Rosa, Sonoma County, California, USA, Dec 17, 2023 09:42 pm (Los Angeles time) (19 km SSW)
All earthquakes at Clear Lake

Coso volcano (California): 2 earthquakes up to magnitude 2.5

2 earthquakes occurred near (under) the volcano during 12 hours, the last being recorded quake 3 hours ago. Hypocenter depths ranged between 1.4 and 1.0 km.
Earthquake details:
2.5 quake Inyo County, 30 mi north of Ridgecrest, Kern County, California, USA, Dec 18, 2023 02:14 pm (Los Angeles time) (11 km ENE)
1.3 quake Inyo County, 40 mi northwest of Ridgecrest, Kern County, California, USA, Dec 18, 2023 12:51 am (Los Angeles time) (17 km NW)
All earthquakes at Coso

Eldey volcano (Iceland): 8 earthquakes up to magnitude 2.1

8 earthquakes occurred near (under) the volcano during 4 hours, the last being recorded quake 1 hour 3 minutes ago. Hypocenter depths ranged between 31.8 and 1.1 km.
Earthquake details: (only 5 largest)
2.1 quake Iceland: 9.0 Km SSE of Geirfugladrangur Dec 18, 2023 10:18 pm (Reykjavik time) (17 km SW)
1.9 quake Iceland: 13.6 Km SSE of Geirfuglasker Dec 18, 2023 10:46 pm (Reykjavik time) (17 km SSW)
1.9 quake 5.1 Km N of Geirfuglasker Dec 18, 2023 06:53 pm (Reykjavik time) (11 km W)
1.3 quake Iceland: 6.4 Km SE of Eldey Dec 18, 2023 09:22 pm (Reykjavik time) (7 km SE)
1.2 quake Iceland: 13.4 Km SE of Eldey Dec 18, 2023 09:18 pm (Reykjavik time) (14 km SE)
All earthquakes at Eldey
Eldey is located at the beginning of the Reykjanes Ridge off the SW tip of Iceland. Its highest elevation is the top of Eldey Island, but most of the volcanic edifice is submerged.

Several eruptions occurred in historic times, last in 1926.

Etna volcano (Italy): 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 0 km distance SW from the volcano.
Earthquake details:
Reported seismic-like event (likely no quake): Near Barcellona Pozzo di Gotto, Sicily, Italy, Dec 18, 2023 11:23 am (GMT +1) (0 km SW)
All earthquakes at Etna

Fagradalsfjall volcano (Reykjanes Peninsula, Iceland): 186 earthquakes up to magnitude 4.2

Possible earthquake swarm: 186 earthquakes occurred near (under) the volcano during 24 hours, the last being recorded quake 16 minutes ago. Hypocenter depths ranged between 16.1 and 0.0 km.
Earthquake details: (only 5 largest)
4.2 quake Iceland: 4.8 Km W of Fagradalsfjall Dec 18, 2023 10:03 pm (Reykjavik time) (5 km WNW)
3.8 quake Iceland: 3.7 Km W of Fagradalsfjall Dec 18, 2023 09:54 pm (Reykjavik time) (4 km W)
3.7 quake Iceland: 3.2 Km W of Fagradalsfjall Dec 18, 2023 11:24 pm (Reykjavik time) (4 km WNW)
3.0 quake 3.5 Km W of Fagradalsfjall Dec 18, 2023 09:37 pm (Reykjavik time) (4 km WNW)
2.7 quake Iceland: 4.9 Km W of Fagradalsfjall Dec 18, 2023 09:55 pm (Reykjavik time) (5 km W)
All earthquakes at Fagradalsfjall

Grímsvötn volcano (Iceland): 2 earthquakes up to magnitude 2.1

2 earthquakes occurred near (under) the volcano during 6 hours, the last being recorded quake 16 hours ago. Hypocenter depths ranged between 5.7 and 1.6 km.
Earthquake details:
2.1 quake Iceland: 6.6 Km NNW of Grímsfjall Dec 18, 2023 08:10 am (Reykjavik time) (4 km N)
0.9 quake Iceland: 8.0 Km SW of Grímsfjall Dec 18, 2023 01:47 am (Reykjavik time) (8 km SSW)
All earthquakes at Grímsvötn

Harra of Arhab volcano (Arabian Peninsula): magnitude 3.0 earthquake

A magnitude 3.0 earthquake occurred at the volcano 6 hours ago. The quake, which might be volcanic in origin, was located at a depth of 10.0 km depth at 6 km distance SE from the volcano.
Earthquake details:
Reported quake or seismic-like event: Near ‘Amrān, Omran, Yemen, Dec 18, 2023 08:54 pm (GMT +3) (6 km SE)
All earthquakes at Harra of Arhab

Hengill volcano (Iceland): 12 earthquakes up to magnitude 1.8

Possible earthquake swarm: 12 earthquakes occurred near (under) the volcano during 7 hours, the last being recorded quake 17 hours ago. Hypocenter depths ranged between 5.3 and 3.5 km.
Earthquake details: (only 5 largest)
1.8 quake Iceland: 2.7 Km N of Skeggi_á_Hengli Dec 18, 2023 03:54 am (Reykjavik time) (7 km S)
1.1 quake Iceland: 3.1 Km N of Skeggi_á_Hengli Dec 18, 2023 07:08 am (Reykjavik time) (7 km S)
1.0 quake Iceland: 3.1 Km N of Skeggi_á_Hengli Dec 18, 2023 04:03 am (Reykjavik time) (7 km S)
1.0 quake Iceland: 3.1 Km N of Skeggi_á_Hengli Dec 18, 2023 04:14 am (Reykjavik time) (7 km S)
0.7 quake Iceland: 3.0 Km N of Skeggi_á_Hengli Dec 18, 2023 04:12 am (Reykjavik time) (7 km S)
All earthquakes at Hengill

Irazu volcano (Costa Rica): magnitude 2.3 earthquake

A magnitude 2.3 earthquake occurred at the volcano 19 hours ago. The quake, which might be volcanic in origin, was located at a depth of 14.0 km depth at 10 km distance WNW from the volcano.
Earthquake details:
2.3 quake 19 km northeast of San Jose, San José, Costa Rica, Dec 17, 2023 10:47 pm (Costa Rica time) (10 km WNW)
All earthquakes at Irazu

Kilauea volcano (Hawai'i (Big Island)): 8 earthquakes up to magnitude 2.6

8 earthquakes occurred near (under) the volcano during 23 hours, the last being recorded quake 40 minutes ago. Hypocenter depths ranged between 11.9 and 1.3 km.
Earthquake details: (only 5 largest)
2.6 quake 26 mi south of Hilo, Hawaii County, USA, Dec 17, 2023 05:13 pm (Honolulu time) (5 km ESE)
2.4 quake 12 mi southwest of Volcano Village, Hawaii County, USA, Dec 17, 2023 09:20 pm (Honolulu time) (13 km SSW)
2.1 quake 29 mi south of Hilo, Hawaii County, USA, Dec 18, 2023 01:09 pm (Honolulu time) (13 km SE)
1.8 quake 26 mi south of Hilo, Hawaii County, USA, Dec 18, 2023 01:48 am (Honolulu time) (6 km ESE)
1.8 quake 25 mi southwest of Hilo, Hawaii County, USA, Dec 17, 2023 01:58 pm (Honolulu time) (2 km NE)
All earthquakes at Kilauea

Ragang volcano (Mindanao): magnitude 2.4 earthquake

A magnitude 2.4 earthquake occurred at the volcano 6 hours ago. The quake, which might be volcanic in origin, was located at a depth of 3.0 km depth at 17 km distance SE from the volcano.
Earthquake details:
2.4 quake Province of Cotabato, Soccsksargen, 9.1 km southwest of Wao, Philippines, Dec 19, 2023 01:50 am (Manila time) (17 km SE)
All earthquakes at Ragang

Raung volcano (East Java): magnitude 2.6 earthquake

A magnitude 2.6 earthquake occurred at the volcano 12 hours ago. The quake, which might be volcanic in origin, was located at a depth of 10.0 km depth at 16 km distance SSW from the volcano.
Earthquake details:
2.6 quake Kabupaten Banyuwangi, 22 km northwest of Genteng, East Java, Indonesia, Dec 18, 2023 07:02 pm (Jakarta time) (16 km SSW)
All earthquakes at Raung

Reykjanes volcano (Reykjanes Peninsula, Iceland): 103 earthquakes up to magnitude 4.1

Possible earthquake swarm: 103 earthquakes occurred near (under) the volcano during 24 hours, the last being recorded quake 18 minutes ago. Hypocenter depths ranged between 13.2 and 0.1 km.
Earthquake details: (only 5 largest)
4.1 quake 3.3 Km NE of Grindavík Dec 18, 2023 11:25 pm (Reykjavik time) (7 km ESE)
2.9 quake Iceland: 4.0 Km NNE of Grindavík Dec 18, 2023 11:00 pm (Reykjavik time) (7 km ESE)
2.5 quake Iceland: 3.9 Km N of Grindavík Dec 18, 2023 11:07 pm (Reykjavik time) (5 km ESE)
2.5 quake 3.7 Km NNE of Grindavík Dec 18, 2023 11:22 pm (Reykjavik time) (7 km ESE)
2.0 quake Iceland: 3.1 Km NNE of Reykjanestá Dec 18, 2023 10:49 pm (Reykjavik time) (11 km SW)
All earthquakes at Reykjanes

Rincón de la Vieja volcano (Costa Rica): magnitude 3.4 earthquake

A magnitude 3.4 earthquake occurred at the volcano 13 hours ago. The quake, which might be volcanic in origin, was located at a depth of 11.0 km depth at 15 km distance SSW from the volcano.
Earthquake details:
3.4 quake 11 km northeast of Liberia, Provincia de Guanacaste, Costa Rica, Dec 18, 2023 04:52 am (Costa Rica time) (15 km SSW)
All earthquakes at Rincón de la Vieja

San Diego volcano (El Salvador): magnitude 2.4 earthquake

A magnitude 2.4 earthquake occurred at the volcano 16 hours ago. The quake, which might be volcanic in origin, was located at a depth of 9.0 km depth at 7 km distance NE from the volcano.
Earthquake details:
2.4 quake 3.7 km southeast of Metapan, Santa Ana, El Salvador, Dec 18, 2023 01:51 am (El Salvador time) (7 km NE)
All earthquakes at San Diego

Terceira volcano (Azores): magnitude 2.5 earthquake

A magnitude 2.5 earthquake occurred at the volcano 22 hours ago. The quake, which might be volcanic in origin, was located at a depth of 0 km depth at 3 km distance NW from the volcano.
Earthquake details:
2.5 quake 16 km northwest of Angra do Heroismo, Azores, Portugal, Dec 18, 2023 12:55 am (Azores time) (3 km NW)
All earthquakes at Terceira
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