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 (7 quakes between mag 1.7-2.4), Campi Flegrei (Phlegrean Fields) (14 quakes between mag 0.1-1.7), Clear Lake (30 quakes between mag 0.2-2.2)
Cuilapa-Barbarena (2 quakes between mag 1.3-1.3), Esjufjöll (1 quake mag 1.5), Eyafjallajökull (1 quake mag 1.4), Fani Maoré (1 quake mag 2.0), Flores (4 quakes between mag 1.3-2.0), Grímsvötn (2 quakes between mag 1.6-4.5), Hekla (2 quakes between mag 1.4-1.6), Katla (10 quakes between mag 0.6-3.0), Kilauea (8 quakes between mag 1.3-2.3), Kolbeinsey Ridge (3 quakes between mag 1.5-1.5), 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), Parker (1 quake mag 1.6), Prestahnukur (2 quakes between mag 1.3-1.8), Salton Buttes (1 quake mag 1.1), Spurr (3 quakes between mag 0.6-1.0), Tenerife (1 quake mag 1.0), Theistareykjarbunga (1 quake mag 2.2), Tjörnes Fracture Zone (1 quake mag 1.1), Ukinrek Maars (1 quake mag 1.6) (updated 00h50)\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 14 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): 7 earthquakes up to magnitude 2.4

7 earthquakes occurred near (under) the volcano during 16 hours, the last being recorded quake 4 hours ago. Hypocenter depths ranged between 43.00 and 28.00 km.
Earthquake details: (only 5 largest)
2.4 quake Philippines: 021 km S 77° W of Balut Island (Municipality of Sarangani) (Davao Occidental) Oct 3, 2026 01:11 pm (GMT +8) (15 km WSW)
1.8 quake Philippines: 014 km N 81° W of Balut Island (Municipality of Sarangani) (Davao Occidental) Oct 4, 2026 05:12 am (GMT +8) (9 km WNW)
1.8 quake 010 km N 25° W of Balut Island (Municipality of Sarangani) (Davao Occidental) Oct 4, 2026 01:01 am (GMT +8) (11 km N)
1.8 quake 006 km S 88° E of Balut Island (Municipality of Sarangani) (Davao Occidental) Oct 3, 2026 04:43 pm (GMT +8) (12 km E)
1.7 quake 006 km S 57° W of Balut Island (Municipality of Sarangani) (Davao Occidental) Oct 3, 2026 11:02 pm (GMT +8) (2 km SSE)
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.

Campi Flegrei (Phlegrean Fields) volcano (Italy): 14 earthquakes up to magnitude 1.7

Possible earthquake swarm: 14 earthquakes occurred near (under) the volcano during 15 hours, the last being recorded quake 8 hours ago. Hypocenter depths ranged between 3.03 and 0.96 km.
Earthquake details: (only 5 largest)
1.7 quake Campi Flegrei Oct 3, 2026 08:05 am (GMT +2) (1 km E)
1.0 quake Campi Flegrei Oct 3, 2026 10:07 am (GMT +2) (2 km NW)
1.0 quake Campi Flegrei Oct 3, 2026 05:37 am (GMT +2) (1 km NW)
0.8 quake Italy: Flegrei Oct 3, 2026 05:04 am (GMT +2) (2 km NW)
0.7 quake Flegrei Oct 3, 2026 09:53 am (GMT +2) (2 km NW)
All earthquakes at Campi Flegrei (Phlegrean Fields)
Campi Flegrei is a 13-km-wide volcanic caldera encompassing part of Naples and the Gulf of Pozzuoli. Its last known eruption formed the Monte Nuovo cone in 1538.

Clear Lake volcano (California): 30 earthquakes up to magnitude 2.2

Possible earthquake swarm: 30 earthquakes occurred near (under) the volcano during 17 hours, the last being recorded quake 1 hour 31 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

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): 10 earthquakes up to magnitude 3.0

10 earthquakes occurred near (under) the volcano during 19 hours, the last being recorded quake 3 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

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

8 earthquakes occurred near (under) the volcano during 15 hours, the last being recorded quake 7 hours ago. Hypocenter depths ranged between 0.83 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 7 km WSW of Volcano, Hawaii, Oct 3, 2026 12:09 am (GMT -10) (2 km SSW)
2.0 quake 5 km SW of Volcano, Hawaii, Oct 2, 2026 06:01 pm (GMT -10) (1 km SE)
1.9 quake 7 km SW of Volcano, Hawaii, Oct 3, 2026 01:02 am (GMT -10) (2 km SSW)
All earthquakes at Kilauea

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

A magnitude 2.2 earthquake occurred at the volcano 20 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.

Theistareykjarbunga volcano (Iceland): magnitude 2.2 earthquake

A magnitude 2.2 earthquake occurred at the volcano 20 hours ago. The quake, which might be volcanic in origin, was located at a depth of 4.40 km depth at 8 km distance W from the volcano.
Earthquake details:
2.2 quake 2.5 km W of Þeistareykir Oct 3, 2026 04:26 am (Universal Time) (8 km W)
All earthquakes at Theistareykjarbunga
Theistareykjarbunga is a 563 m-high basaltic shield volcano in northern Iceland. Three eruption periods are dated to approximately 9500 BCE, 6800 BCE and 900 BCE, with uncertainty attached to the two older dates.
https://www.volcanodiscovery.com/earthquakes-volcanoes/news/370876/Volcano-earthquake-report-2026-10-04.html