Volcano earthquake report for Sunday, 4 October 2026

Quakes detected near: Alaska Peninsula Arc at 155.4°W (1 quake mag 1.4), Apoyeque (2 quakes between mag 2.0-2.4), Askja (2 quakes between mag 1.1-1.4), Balut (10 quakes between mag 1.7-2.4), Brennisteinsfjöll (17 quakes between mag 0.0-3.3), Campi Flegrei (Phlegrean Fields) (10 quakes between mag 0.1-1.7)
Clear Lake (36 quakes between mag 0.2-2.2), Colima (4 quakes between mag 2.4-2.5), Cuilapa-Barbarena (4 quakes between mag 1.1-1.3), Esjufjöll (1 quake mag 1.5), Eyafjallajökull (1 quake mag 1.4), Flores (2 quakes between mag 1.4-1.5), Grímsvötn (2 quakes between mag 1.6-4.5), Hekla (2 quakes between mag 1.4-1.6), Katla (8 quakes between mag 0.6-3.0), Kerlingarfjöll (1 quake mag 2.2), Kilauea (8 quakes between mag 1.3-2.3), Kolbeinsey Ridge (4 quakes between mag 1.5-2.1), Krísuvík (5 quakes between mag 0.4-1.2), Loki-Fögrufjöll volcano (2 quakes between mag 1.4-1.7), Mauna Kea (1 quake mag 2.2), Olot Field (1 quake mag 1.0), Oshima (1 quake mag 2.1), Parker (1 quake mag 1.6), Prestahnukur (2 quakes between mag 1.3-1.8), Spurr (3 quakes between mag 0.6-1.0), Tenerife (1 quake mag 1.0), Tjörnes Fracture Zone (1 quake mag 1.1), Ukinrek Maars (1 quake mag 1.6) (updated 04h50)\n\nNote: 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.\n
Volcanoes with recent earthquakes above magnitude 2 or more than 10 quakes are listed below:

Apoyeque volcano (Nicaragua): 2 earthquakes up to magnitude 2.4

2 earthquakes occurred near (under) the volcano during 2 hours, the last being recorded quake 18 hours ago. Hypocenter depths ranged between 10.00 and 7.00 km.
Earthquake details:
2.4 quake 4 km Al Sureste De Mateare, Nicaragua, Oct 3, 2026 02:14 am (GMT -6) (7 km WSW)
2.0 quake 5 km Al Sureste De Mateare, Nicaragua, Oct 3, 2026 04:36 am (GMT -6) (7 km WSW)
All earthquakes at Apoyeque
Apoyeque is a lake-filled volcanic complex on Nicaragua’s Chiltepe Peninsula, near Managua. Geological deposits record four eruptions between about 4160 BCE and 50 BCE, but none has been documented in written history.

Balut volcano (Mindanao): 10 earthquakes up to magnitude 2.4

10 earthquakes occurred near (under) the volcano during 23 hours, the last being recorded quake 1 hour 2 minutes ago. Hypocenter depths ranged between 43.00 and 4.00 km.
Earthquake details: (only 5 largest)
2.4 quake 018 km S 50° W of Balut Island (Municipality of Sarangani) (Davao Occidental) Oct 4, 2026 12:52 am (GMT +8) (13 km SW)
2.4 quake 021 km S 77° W of Balut Island (Municipality of Sarangani) (Davao Occidental) Oct 3, 2026 01:11 pm (GMT +8) (15 km WSW)
2.4 quake Mindanao, Philippines, Oct 3, 2026 12:52 pm (GMT +8) (13 km SW)
2.1 quake Philippines: 008 km N 46° W of Balut Island (Municipality of Sarangani) (Davao Occidental) Oct 4, 2026 11:48 am (GMT +8) (7 km N)
1.8 quake 014 km N 81° W of Balut Island (Municipality of Sarangani) (Davao Occidental) Oct 4, 2026 05:12 am (GMT +8) (9 km WNW)
All earthquakes at Balut
Balut is an 840 m island stratovolcano south of Mindanao whose last known eruption occurred between about 2 million and 11,700 years ago. Hot springs and thermally altered ground occur on its western and southwestern flanks.

Brennisteinsfjöll volcano (Reykjanes Peninsula, Iceland): 17 earthquakes up to magnitude 3.3

Possible earthquake swarm: 17 earthquakes occurred near (under) the volcano during 23 hours, the last being recorded quake 1 hour 18 minutes ago. Hypocenter depths ranged between 5.60 and 0.00 km.
Earthquake details: (only 5 largest)
3.3 quake Iceland Region Oct 4, 2026 12:40 am (GMT +0) (5 km N)
2.3 quake Iceland: 6.6 km S of Helgafell Oct 4, 2026 03:32 am (Reykjavik time) (3 km N)
1.8 quake 6.9 km SSE of Helgafell Oct 4, 2026 02:58 am (Universal Time) (3 km N)
0.8 quake Iceland: 7.7 km S of Helgafell Oct 4, 2026 12:43 am (Reykjavik time) (2 km N)
0.7 quake Iceland: 5.1 km SE of Helgafell Oct 4, 2026 02:59 am (Reykjavik time) (7 km NNE)
All earthquakes at Brennisteinsfjöll
Brennisteinsfjöll is an Icelandic volcanic system of crater rows and small shield volcanoes with an eruptive record extending back about 11,000 years. Its last known eruption occurred around 1341.

Clear Lake volcano (California): 36 earthquakes up to magnitude 2.2

Possible earthquake swarm: 36 earthquakes occurred near (under) the volcano during 22 hours, the last being recorded quake 35 minutes ago. Hypocenter depths ranged between 8.19 and 0.72 km.
Earthquake details: (only 5 largest)
2.2 quake 12 km WNW of Cobb, CA, Oct 3, 2026 03:00 am (GMT -7) (14 km SSW)
2.0 quake 7 km NW of the Geysers, CA, Oct 3, 2026 06:09 am (GMT -7) (17 km SSW)
2.0 quake 12 km WNW of Cobb, CA, Oct 3, 2026 03:00 am (GMT -7) (14 km SSW)
1.8 quake 6 km NNW of the Geysers, CA, Oct 3, 2026 01:48 pm (GMT -7) (16 km S)
1.3 quake 6 km NW of the Geysers, CA, Oct 3, 2026 07:51 am (GMT -7) (17 km S)
All earthquakes at Clear Lake

Colima volcano (Western & Central Mexico): 4 earthquakes up to magnitude 2.5

4 earthquakes occurred near (under) the volcano during 6 minutes, the last being recorded quake 14 hours ago. Hypocenter depths ranged between 30.30 and 23.20 km.
Earthquake details:
2.5 quake Jalisco, Mexico, Oct 3, 2026 09:11 am (GMT -6) (19 km WNW)
2.5 quake Jalisco, Mexico, Oct 3, 2026 09:14 am (GMT -6) (18 km WNW)
2.4 quake Jalisco, Mexico, Oct 3, 2026 09:16 am (GMT -6) (16 km WNW)
2.4 quake Jalisco, Mexico, Oct 3, 2026 09:17 am (GMT -6) (18 km WNW)
All earthquakes at Colima
Colima, or Volcán de Fuego, is a frequently erupting stratovolcano in western Mexico. Its history includes summit-destroying explosions, lava-dome growth, pyroclastic flows and a confirmed eruption in 2019.

Grímsvötn volcano (Iceland): 2 earthquakes up to magnitude 4.5

2 earthquakes occurred near (under) the volcano at nearly the same time (11:54 UTC). Hypocenter depths ranged between 5.20 and 1.80 km.
Earthquake details:
4.5 quake Iceland: 11.7 km E of Grímsfjall Oct 3, 2026 11:53 am (Reykjavik time) (15 km E)
1.6 quake 17.3 km NNE of Grímsfjall Oct 3, 2026 11:54 am (Universal Time) (17 km NNE)
All earthquakes at Grímsvötn

Katla volcano (Iceland): 8 earthquakes up to magnitude 3.0

8 earthquakes occurred near (under) the volcano during 12 hours, the last being recorded quake 7 hours ago. Hypocenter depths ranged between 14.10 and 0.00 km.
Earthquake details: (only 5 largest)
3.0 quake Iceland Oct 3, 2026 09:44 pm (Reykjavik time) (2 km WNW)
2.9 quake Iceland Oct 3, 2026 09:27 pm (Universal Time) (2 km WNW)
1.9 quake Iceland: 6.4 km N of Hábunga Oct 3, 2026 09:51 pm (Reykjavik time) (2 km WNW)
1.1 quake Iceland: 7.5 km NNW of Goðabunga Oct 3, 2026 10:02 am (Reykjavik time) (14 km NW)
0.9 quake Iceland: 6.1 km N of Hábunga Oct 3, 2026 09:32 pm (Reykjavik time) (2 km W)
All earthquakes at Katla

Kerlingarfjöll volcano (Iceland): magnitude 2.2 earthquake

A magnitude 2.2 earthquake occurred at the volcano 4 hours ago. The quake, which might be volcanic in origin, was located at a depth of 0 km depth at 9 km distance SSE from the volcano.
Earthquake details:
2.2 quake Iceland: 37.0 km SSE of Hveravellir Oct 4, 2026 12:40 am (Reykjavik time) (9 km SSE)
All earthquakes at Kerlingarfjöll

Kilauea volcano (Hawai'i (Big Island)): 8 earthquakes up to magnitude 2.3

8 earthquakes occurred near (under) the volcano during 17 hours, the last being recorded quake 1 hour 43 minutes ago. Hypocenter depths ranged between 31.31 and 0.12 km.
Earthquake details: (only 5 largest)
2.3 quake 5 km WSW of Volcano, Hawaii, Oct 3, 2026 05:50 am (GMT -10) (1 km SE)
2.3 quake 5 km WSW of Volcano, Hawaii, Oct 3, 2026 05:48 am (GMT -10) (1 km ESE)
2.1 quake 13 km ENE of Pāhala, Hawaii, Oct 3, 2026 05:06 pm (GMT -10) (19 km SSW)
2.1 quake 7 km WSW of Volcano, Hawaii, Oct 3, 2026 12:09 am (GMT -10) (2 km SSW)
2.0 quake 6 km W of Volcano, Hawaii, Oct 3, 2026 04:14 pm (GMT -10) (3 km NNW)
All earthquakes at Kilauea

Kolbeinsey Ridge volcano (Iceland): 4 earthquakes up to magnitude 2.1

4 earthquakes occurred near (under) the volcano during 20 hours, the last being recorded quake 4 hours ago. Hypocenter depths ranged between 10.00 and 3.50 km.
Earthquake details:
2.1 quake Iceland: 36.4 km WNW of Grímsey Oct 4, 2026 12:59 am (Reykjavik time) (11 km WNW)
1.5 quake 34.0 km WNW of Grímsey Oct 3, 2026 12:33 pm (Universal Time) (8 km WNW)
1.5 quake 34.7 km WNW of Grímsey Oct 3, 2026 06:43 am (Universal Time) (9 km WNW)
1.5 quake 37.0 km WNW of Grímsey Oct 3, 2026 05:09 am (Universal Time) (11 km WNW)
All earthquakes at Kolbeinsey Ridge
Kolbeinsey Ridge is a submarine fissure-vent system north of Iceland, with tiny Kolbeinsey Island as its only expression above sea level. Historical eruption reports from 1372 and 1755 have uncertain locations.

Mauna Kea volcano (Hawai'i (Big Island)): magnitude 2.2 earthquake

A magnitude 2.2 earthquake occurred at the volcano 24 hours ago. The quake, which might be volcanic in origin, was located at a depth of 13.77 km depth at 12 km distance WSW from the volcano.
Earthquake details:
2.2 quake 30 km SE of Waikoloa, Hawaii, Oct 2, 2026 06:58 pm (GMT -10) (12 km WSW)
All earthquakes at Mauna Kea
Mauna Kea is Hawaiʻi’s highest volcano and last erupted about 4,500 years ago, producing cinder cones and lava flows. Numerous cones and astronomical observatories occupy its summit region.

Oshima volcano (Izu Islands): magnitude 2.1 earthquake

A magnitude 2.1 earthquake occurred at the volcano 31 minutes ago. The quake, which might be volcanic in origin, was located at a depth of 10.00 km depth at 8 km distance N from the volcano.
Earthquake details:
2.1 quake Near South Coast of Honshu, Japan, Oct 4, 2026 01:19 pm (GMT +9) (8 km N)
All earthquakes at Oshima
Izu-Oshima is an active island stratovolcano in Japan’s Izu Islands, with numerous recorded eruptions since the 7th century. Its major 1986 eruption produced high lava fountains, fissure-fed lava flows and the evacuation of more than 12,000 people.
https://www.volcanodiscovery.com/earthquakes-volcanoes/news/370876/Volcano-earthquake-report-2026-10-04.html