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 (9 quakes between mag 1.7-2.4), Brennisteinsfjöll (15 quakes between mag 0.0-3.3), Campi Flegrei (Phlegrean Fields) (13 quakes between mag 0.1-1.7)
Clear Lake (33 quakes between mag 0.2-2.2), Colima (4 quakes between mag 2.4-2.5), Cuilapa-Barbarena (3 quakes between mag 1.1-1.3), Esjufjöll (1 quake mag 1.5), Eyafjallajökull (1 quake mag 1.4), Flores (3 quakes between mag 1.3-1.5), Grímsvötn (2 quakes between mag 1.6-4.5), Hekla (2 quakes between mag 1.4-1.6), Katla (9 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), 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 02h50)\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 16 hours ago. Hypocenter depths ranged between 10.00 and 7.00 km.
Earthquake details:
2.4 quake 18 km northwest of Managua, Departamento de Managua, Nicaragua, Oct 3, 2026 02:14 am (GMT -6) (7 km WSW)
2.0 quake 18 km northwest of Managua, Departamento de Managua, 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): 9 earthquakes up to magnitude 2.4

9 earthquakes occurred near (under) the volcano during 16 hours, the last being recorded quake 6 hours ago. Hypocenter depths ranged between 43.00 and 4.00 km.
Earthquake details: (only 5 largest)
2.4 quake Celebes Sea, 24 km southwest of Sarangani Island, Philippines, Oct 4, 2026 12:52 am (GMT +8) (13 km SW)
2.4 quake Celebes Sea, 27 km west of Sarangani Island, Philippines, Oct 3, 2026 01:11 pm (GMT +8) (15 km WSW)
2.4 quake Celebes Sea, 24 km southwest of Sarangani Island, Philippines, Oct 3, 2026 12:52 pm (GMT +8) (13 km SW)
1.8 quake Celebes Sea, 20 km west of Sarangani Island, Philippines, Oct 4, 2026 05:12 am (GMT +8) (9 km WNW)
1.8 quake Philippine Sea, 12 km northwest of Sarangani Island, Philippines, Oct 4, 2026 01:01 am (GMT +8) (11 km N)
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): 15 earthquakes up to magnitude 3.3

Possible earthquake swarm: 15 earthquakes occurred near (under) the volcano during 21 hours, the last being recorded quake 1 hour 46 minutes ago. Hypocenter depths ranged between 5.80 and 0.00 km.
Earthquake details: (only 5 largest)
3.3 quake Southern Peninsula, 19 km south of Reykjavik, Capital Region, Iceland, Oct 4, 2026 12:40 am (GMT +0) (5 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 6.9 km S of Helgafell Oct 4, 2026 01:04 am (Universal Time) (3 km N)
0.7 quake Iceland: 7.3 km S of Helgafell Oct 4, 2026 12:46 am (Reykjavik time) (3 km N)
0.7 quake 8.9 km SW of Bláfjallaskáli Oct 3, 2026 04:34 am (Universal Time) (3 km ENE)
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.

Campi Flegrei (Phlegrean Fields) volcano (Italy): 13 earthquakes up to magnitude 1.7

Possible earthquake swarm: 13 earthquakes occurred near (under) the volcano during 13 hours, the last being recorded quake 10 hours ago. Hypocenter depths ranged between 3.03 and 0.96 km.
Earthquake details: (only 5 largest)
1.7 quake 3.9 km west of Fuorigrotta, Napoli, Campania, Italy, Oct 3, 2026 08:05 am (GMT +2) (1 km E)
1.0 quake 1.9 km east of Pozzuoli, Napoli, Campania, Italy, Oct 3, 2026 10:07 am (GMT +2) (2 km NW)
1.0 quake 3.5 km southeast of Pozzuoli, Napoli, Campania, Italy, Oct 3, 2026 05:37 am (GMT +2) (1 km NW)
0.8 quake 2.5 km east of Pozzuoli, Napoli, Campania, Italy, Oct 3, 2026 05:04 am (GMT +2) (2 km NW)
0.7 quake 12 km west of Naples, Napoli, Campania, Italy, 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): 33 earthquakes up to magnitude 2.2

Possible earthquake swarm: 33 earthquakes occurred near (under) the volcano during 19 hours, the last being recorded quake 1 hour 18 minutes ago. Hypocenter depths ranged between 8.19 and 0.72 km.
Earthquake details: (only 5 largest)
2.2 quake Mendocino County, 14 mi southwest of Clearlake, Lake County, California, United States, Oct 3, 2026 03:00 am (GMT -7) (14 km SSW)
2.0 quake Sonoma County, 14 mi southwest of Clearlake, Lake County, California, United States, Oct 3, 2026 06:09 am (GMT -7) (17 km SSW)
2.0 quake Mendocino County, 14 mi southwest of Clearlake, Lake County, California, United States, Oct 3, 2026 03:00 am (GMT -7) (14 km SSW)
1.8 quake Sonoma County, 13 mi southwest of Clearlake, Lake County, California, United States, Oct 3, 2026 01:48 pm (GMT -7) (16 km S)
1.3 quake 27 mi north of Santa Rosa, Sonoma County, California, United States, 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 12 hours ago. Hypocenter depths ranged between 30.30 and 23.20 km.
Earthquake details:
2.5 quake 34 km west of Ciudad Guzman, Estado de Jalisco, Mexico, Oct 3, 2026 09:11 am (GMT -6) (19 km WNW)
2.5 quake 34 km west of Ciudad Guzman, Estado de Jalisco, Mexico, Oct 3, 2026 09:14 am (GMT -6) (18 km WNW)
2.4 quake 32 km west of Ciudad Guzman, Estado de Jalisco, Mexico, Oct 3, 2026 09:16 am (GMT -6) (16 km WNW)
2.4 quake 33 km west of Ciudad Guzman, Estado de 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): 9 earthquakes up to magnitude 3.0

9 earthquakes occurred near (under) the volcano during 18 hours, the last being recorded quake 5 hours ago. Hypocenter depths ranged between 14.10 and 0.00 km.
Earthquake details: (only 5 largest)
3.0 quake South, 148 km east of Reykjavik, Capital Region, Iceland, Oct 3, 2026 09:44 pm (Reykjavik time) (2 km WNW)
2.9 quake South, 147 km east of Reykjavik, Capital Region, 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 2 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 22 hours, the last being recorded quake 35 minutes ago. Hypocenter depths ranged between 3.06 and 0.12 km.
Earthquake details: (only 5 largest)
2.3 quake 3.5 mi southwest of Volcano, Hawaii County, Hawaii, United States, Oct 3, 2026 05:50 am (GMT -10) (1 km SE)
2.3 quake 25 mi southwest of Hilo, Hawaii County, Hawaii, United States, Oct 3, 2026 05:48 am (GMT -10) (1 km ESE)
2.1 quake 26 mi southwest of Hilo, Hawaii County, Hawaii, United States, Oct 3, 2026 12:09 am (GMT -10) (2 km SSW)
2.0 quake 24 mi southwest of Hilo, Hawaii County, Hawaii, United States, Oct 3, 2026 04:14 pm (GMT -10) (3 km NNW)
2.0 quake 25 mi southwest of Hilo, Hawaii County, Hawaii, United States, Oct 2, 2026 06:01 pm (GMT -10) (1 km SE)
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 1 hour 50 minutes 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 22 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 19 mi south of Waimea, Hawaii County, Hawaii, United States, 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 22 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