Volcano earthquake report for Monday, 28 September 2026

Quakes detected near: Agua (1 quake mag 2.9), Alaska Peninsula Arc at 155.4°W (2 quakes between mag 1.0-1.2), Askja (2 quakes between mag 0.3-1.4), Augustine (1 quake mag 1.1), Balut (1 quake mag 2.1), Bardarbunga (5 quakes between mag 0.3-1.4)
Biliran (1 quake mag 2.2), Camiguin de Babuyanes (1 quake mag 2.0), Chingo (2 quakes between mag 1.1-1.6), Clear Lake (24 quakes between mag 0.3-1.5), Conchagüita (1 quake mag 2.8), Corcovado (1 quake mag 4.4), Eldey (3 quakes between mag 0.7-1.1), Etna (3 quakes between mag 0.5-1.2), Flores (16 quakes between mag 0.9-2.7), Hofsjökull (1 quake mag 1.3), Isarog (1 quake mag 2.4), Kanlaon (2 quakes between mag 2.4-2.8), Karadağ (3 quakes between mag 1.5-2.1), La Palma (1 quake mag 1.3), Ljósufjöll (2 quakes between mag 1.1-1.5), Mayon (1 quake mag 1.6), Methana (1 quake mag 1.7), Mount Adams (1 quake mag 2.6), Novarupta (3 quakes between mag 0.6-2.0), Numazawa (1 quake mag 2.8), Pocdol Mountains (1 quake mag 1.5), Prestahnukur (1 quake mag 1.7), Santiaguito (1 quake mag 1.6), Svartsengi (1 quake mag 1.1), Tahual (1 quake mag 2.5), Tecuamburro (2 quakes between mag 1.3-2.6), Tjörnes Fracture Zone (3 quakes between mag 1.4-2.1), Torfajökull (18 quakes between mag 0.0-1.1), Trident (2 quakes between mag 0.5-1.3) (updated 13h50)\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:

Agua volcano (Guatemala): magnitude 2.9 earthquake

A magnitude 2.9 earthquake occurred at the volcano 9 hours ago. The quake, which might be volcanic in origin, was located at a depth of 12.00 km depth at 8 km distance SSW from the volcano.
Earthquake details:
2.9 quake Departamento de Santa Rosa, 38 km southwest of Guatemala City, Guatemala, Sep 27, 2026 11:00 pm (GMT -6) (8 km SSW)
All earthquakes at Agua
Agua is a prominent 3,760 m stratovolcano beside Antigua, Guatemala. It has no recorded eruptions, while a devastating mudflow destroyed Ciudad Vieja in 1541.

Balut volcano (Mindanao): magnitude 2.1 earthquake

A magnitude 2.1 earthquake occurred at the volcano 19 hours ago. The quake, which might be volcanic in origin, was located at a depth of 19.00 km depth at 7 km distance SW from the volcano.
Earthquake details:
2.1 quake Celebes Sea, 19 km southwest of Sarangani Island, Philippines, Sep 28, 2026 02:58 am (GMT +8) (7 km SW)
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.

Biliran volcano (Central Philippines): 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 23.00 km depth at 18 km distance SSW from the volcano.
Earthquake details:
2.2 quake 42 km north of Ormoc, Province of Leyte, Eastern Visayas, Philippines, Sep 28, 2026 05:40 pm (GMT +8) (18 km SSW)
All earthquakes at Biliran
Biliran is a dome-rich volcanic island across a narrow strait from northern Leyte in the Philippines. Its only known historical eruption was a phreatic explosion with ash and a possible debris avalanche on 26 September 1939.

Clear Lake volcano (California): 24 earthquakes up to magnitude 1.5

Possible earthquake swarm: 24 earthquakes occurred near (under) the volcano during 21 hours, the last being recorded quake 18 minutes ago. Hypocenter depths ranged between 15.91 and 0.26 km.
Earthquake details: (only 5 largest)
1.5 quake 28 mi north of Santa Rosa, Sonoma County, California, United States, Sep 28, 2026 02:25 am (GMT -7) (17 km SSW)
1.5 quake 28 mi north of Santa Rosa, Sonoma County, California, United States, Sep 27, 2026 02:22 pm (GMT -7) (16 km SSW)
1.4 quake Lake County, 27 mi north of Santa Rosa, Sonoma County, California, United States, Sep 27, 2026 01:05 pm (GMT -7) (16 km S)
1.3 quake 28 mi north of Santa Rosa, Sonoma County, California, United States, Sep 28, 2026 12:57 am (GMT -7) (17 km SSW)
1.2 quake 28 mi north of Santa Rosa, Sonoma County, California, United States, Sep 27, 2026 02:03 pm (GMT -7) (15 km SSW)
All earthquakes at Clear Lake

Conchagüita volcano (El Salvador): magnitude 2.8 earthquake

A magnitude 2.8 earthquake occurred at the volcano 6 hours ago. The quake, which might be volcanic in origin, was located at a depth of 6.00 km depth at 19 km distance WNW from the volcano.
Earthquake details:
2.8 quake 9.1 km west of La Union, Departamento de La Union, El Salvador, Sep 28, 2026 01:57 am (GMT -6) (19 km WNW)
All earthquakes at Conchagüita
Conchagüita is a 505-m-high island stratovolcano in El Salvador’s Gulf of Fonseca. Its last known eruption occurred more than about 11,700 years ago, and a reported 1892 eruption is discredited.

Corcovado volcano (Southern Chile and Argentina): magnitude 4.4 earthquake

A magnitude 4.4 earthquake occurred at the volcano 19 hours ago. The quake, which might be volcanic in origin, was located at a depth of 10.00 km depth at 18 km distance NE from the volcano.
Earthquake details:
4.4 quake Provincia de Palena, 81 km east of Quellon, Provincia de Chiloe, Region de los Lagos, Chile, Sep 27, 2026 03:55 pm (Santiago time) (18 km NE)
All earthquakes at Corcovado
Corcovado is an isolated, glacier-eroded stratovolcano in Chile, surrounded by younger cinder cones. Three prehistoric eruptions are confirmed, while reports of activity in 1834 and 1835 are uncertain.

Flores volcano (Guatemala): 16 earthquakes up to magnitude 2.7

Possible earthquake swarm: 16 earthquakes occurred near (under) the volcano during 22 hours, the last being recorded quake 1 hour 1 minutes ago. Hypocenter depths ranged between 15.20 and 1.30 km.
Earthquake details: (only 5 largest)
2.7 quake 24 km northeast of Cuilapa, Departamento de Santa Rosa, Guatemala, Sep 27, 2026 12:28 pm (GMT -6) (14 km WNW)
2.6 quake 18 km northeast of Cuilapa, Departamento de Santa Rosa, Guatemala, Sep 28, 2026 06:49 am (GMT -6) (18 km WNW)
2.4 quake 22 km northeast of Cuilapa, Departamento de Santa Rosa, Guatemala, Sep 28, 2026 12:49 am (GMT -6) (15 km WNW)
2.3 quake 22 km northeast of Cuilapa, Departamento de Santa Rosa, Guatemala, Sep 27, 2026 03:52 pm (GMT -6) (15 km WNW)
2.2 quake 22 km northeast of Cuilapa, Departamento de Santa Rosa, Guatemala, Sep 28, 2026 12:44 am (GMT -6) (15 km WNW)
All earthquakes at Flores
Flores, also known as Volcán Amayo, is a volcanic field about 10 km west of Jutiapa in southeastern Guatemala. Its last eruption is undated, and none are known from approximately the past 11,700 years.

Isarog volcano (Luzon Island): magnitude 2.4 earthquake

A magnitude 2.4 earthquake occurred at the volcano 11 hours ago. The quake, which might be volcanic in origin, was located at a depth of 16.00 km depth at 12 km distance NNE from the volcano.
Earthquake details:
2.4 quake 23 km east of Calabanga, Province of Camarines Sur, Bicol, Philippines, Sep 28, 2026 10:43 am (GMT +8) (12 km NNE)
All earthquakes at Isarog
Isarog is a 1,966 m stratovolcano in southeastern Luzon with a broad breached summit crater and a major debris-avalanche deposit. Its only confirmed eruptive period is dated to around 3500 BCE.

Kanlaon volcano (Central Philippines): 2 earthquakes up to magnitude 2.8

2 earthquakes occurred near (under) the volcano during 2 hours, the last being recorded quake 21 hours ago. Hypocenter depths ranged between 9.00 and 4.00 km.
Earthquake details:
2.8 quake 11 km east of Tinongan, Philippines, Sep 28, 2026 12:45 am (GMT +8) (18 km S)
2.4 quake Province of Negros Occidental, Western Visayas, 8.5 km north of Canlaon, Philippines, Sep 27, 2026 10:36 pm (GMT +8) (9 km NE)
All earthquakes at Kanlaon
Kanlaon is a 2,422-m-high stratovolcano and the highest point on the Philippine island of Negros. Its frequently explosive historical activity includes a deadly 1996 eruption and stronger eruptions during 2024-26.

Karadağ volcano (Turkey): 3 earthquakes up to magnitude 2.1

3 earthquakes occurred near (under) the volcano during 18 minutes, the last being recorded quake 14 hours ago. Hypocenter depths ranged between 11.60 and 6.90 km.
Earthquake details:
2.1 quake 20 km north of Karaman, Karaman, Turkey, Sep 28, 2026 02:59 am (GMT +3) (12 km ESE)
1.8 quake 21 km north of Karaman, Karaman, Turkey, Sep 28, 2026 03:10 am (GMT +3) (12 km ESE)
1.5 quake 21 km north of Karaman, Karaman, Turkey, Sep 28, 2026 03:17 am (GMT +3) (14 km ESE)
All earthquakes at Karadağ

Mount Adams volcano (Washington State): magnitude 2.6 earthquake

A magnitude 2.6 earthquake occurred at the volcano 14 hours ago. The quake, which might be volcanic in origin, was located at a depth of 2.27 km depth at 3 km distance W from the volcano.
Earthquake details:
2.6 quake Skamania County, 56 mi southwest of Yakima, Yakima County, Washington, United States, Sep 27, 2026 05:12 pm (GMT -7) (3 km W)
All earthquakes at Mount Adams
Mount Adams is a large stratovolcano in south-central Washington with more than 60 flank vents. Its last known eruption occurred around 950 CE, producing minor tephra and possibly a small east-flank lava flow.

Numazawa volcano (Honshu): magnitude 2.8 earthquake

A magnitude 2.8 earthquake occurred at the volcano 6 hours ago. The quake, which might be volcanic in origin, was located at a depth of 6.70 km depth at 12 km distance WSW from the volcano.
Earthquake details:
2.8 quake 46 km west of Aizu-Wakamatsu, Fukushima, Japan, Sep 28, 2026 04:24 pm (GMT +9) (12 km WSW)
All earthquakes at Numazawa
Numazawa is a Japanese shield volcano with a 1.5 × 2 km lake-filled caldera. Its only listed confirmed eruptive period was a major explosive and effusive event several thousand years ago.

Tahual volcano (Guatemala): magnitude 2.5 earthquake

A magnitude 2.5 earthquake occurred at the volcano 10 hours ago. The quake, which might be volcanic in origin, was located at a depth of 2.00 km depth at 15 km distance WNW from the volcano.
Earthquake details:
2.5 quake 20 km south of Jalapa, Departamento de Jalapa, Guatemala, Sep 27, 2026 09:52 pm (GMT -6) (15 km WNW)
All earthquakes at Tahual
Tahual is an eroded, forested stratovolcano south of Monjas in Guatemala. A cone near its northeastern base produced a short basaltic lava flow during approximately the past 11,700 years, but the date of the volcano’s last eruption is unknown.

Tecuamburro volcano (Guatemala): 2 earthquakes up to magnitude 2.6

2 earthquakes occurred near (under) the volcano during 7 minutes, the last being recorded quake 15 hours ago. Hypocenter depths ranged between 6.30 and 3.20 km.
Earthquake details:
2.6 quake 12 km southeast of Cuilapa, Departamento de Santa Rosa, Guatemala, Sep 27, 2026 05:00 pm (GMT -6) (17 km E)
1.3 quake 13 km southeast of Cuilapa, Departamento de Santa Rosa, Guatemala, Sep 27, 2026 05:07 pm (GMT -6) (18 km E)
All earthquakes at Tecuamburro
Tecuamburro is a forested stratovolcano and lava-dome complex in Guatemala. Its only dated eruption, about 2,900 years ago, formed the Laguna Ixpaco tuff ring.

Tjörnes Fracture Zone volcano (Iceland): 3 earthquakes up to magnitude 2.1

3 earthquakes occurred near (under) the volcano during 13 hours, the last being recorded quake 5 hours ago. Hypocenter depths ranged between 15.80 and 0.10 km.
Earthquake details:
2.1 quake Iceland: 32.2 km WNW of Kópasker Sep 27, 2026 07:22 pm (Reykjavik time) (15 km N)
1.6 quake Iceland: 26.2 km WNW of Kópasker Sep 27, 2026 11:47 pm (Reykjavik time) (14 km NNE)
1.4 quake Iceland: 28.0 km NE of Flatey Sep 28, 2026 08:32 am (Reykjavik time) (15 km WNW)
All earthquakes at Tjörnes Fracture Zone
The Tjörnes Fracture Zone is an offshore volcanic system north of Iceland. A poorly documented submarine eruption was reported near Manareyjar Island in 1867–1868.

Torfajökull volcano (Iceland): 18 earthquakes up to magnitude 1.1

Possible earthquake swarm: 18 earthquakes occurred near (under) the volcano during 20 hours, the last being recorded quake 4 hours ago. Hypocenter depths ranged between 5.40 and 0.00 km.
Earthquake details: (only 5 largest)
1.1 quake 10.4 km NNW of Álftavatn Sep 28, 2026 06:31 am (Universal Time) (7 km W)
0.9 quake 12.8 km NW of Álftavatn Sep 27, 2026 08:28 pm (Universal Time) (10 km WNW)
0.9 quake Iceland: 10.3 km NNW of Álftavatn Sep 27, 2026 02:05 pm (Reykjavik time) (5 km WNW)
0.6 quake Iceland: 9.3 km NNW of Álftavatn Sep 28, 2026 08:51 am (Reykjavik time) (6 km W)
0.6 quake 12.5 km NNW of Álftavatn Sep 28, 2026 12:13 am (Universal Time) (9 km WNW)
All earthquakes at Torfajökull
Torfajökull contains Iceland’s largest exposed area of silicic and intermediate volcanism. Ten recorded eruptive periods span about 8,000 years, with the last known eruption in 1477.
https://www.volcanodiscovery.com/earthquakes-volcanoes/news/366474/Volcano-earthquake-report-2026-09-28.html

M 5.4 - north of Svalbard

Time

2026-09-28 13:22:39 UTC

2026-09-28 13:22:39 UTC at epicenter

Location

82.639°N 7.192°W

Depth

10.00 km (6.21 mi)

https://earthquake.usgs.gov/earthquakes/eventpage/us6000ty57

M 2.4 - 70 km SSW of Nikolski, Alaska

Time

2026-09-03 13:34:38 UTC

2026-09-03 13:34:38 UTC at epicenter

Location

52.332°N 169.142°W

Depth

10.00 km (6.21 mi)

https://earthquake.usgs.gov/earthquakes/eventpage/us7000te3b

M 4.1 - 105 km SSW of Nikolski, Alaska

ShakeMap - II

Time

2026-09-03 13:27:16 UTC

2026-09-03 13:27:16 UTC at epicenter

Location

52.017°N 169.220°W

Depth

10.00 km (6.21 mi)

https://earthquake.usgs.gov/earthquakes/eventpage/us7000tdzd

M 1.3 - 11 km SSE of Portola Valley, CA

Time

2026-09-28 12:57:55 UTC

2026-09-28 12:57:55 UTC at epicenter

Location

37.293°N 122.198°W

Depth

1.90 km (1.18 mi)

https://earthquake.usgs.gov/earthquakes/eventpage/nc75443797

M 1.5 - 28 km WNW of Enoch, Utah

Time

2026-09-27 13:08:42 UTC

2026-09-27 13:08:42 UTC at epicenter

Location

37.895°N 113.304°W

Depth

6.54 km (4.06 mi)

https://earthquake.usgs.gov/earthquakes/eventpage/uu80158111

M 1.3 Quarry Blast - 8 km ESE of Dougherty, Oklahoma

Time

2026-09-25 21:02:40 UTC

2026-09-25 21:02:40 UTC at epicenter

Location

34.370°N 96.976°W

Depth

0.00 km (0.00 mi)

https://earthquake.usgs.gov/earthquakes/eventpage/ok2026svkz

M 1.5 - 19 km ESE of Anza, CA

Time

2026-09-27 18:42:54 UTC

2026-09-27 18:42:54 UTC at epicenter

Location

33.486°N 116.482°W

Depth

12.99 km (8.07 mi)

https://earthquake.usgs.gov/earthquakes/eventpage/ci41339983

M 1.1 - 12 km NW of Big Bear Lake, CA

Time

2026-09-27 18:36:31 UTC

2026-09-27 18:36:31 UTC at epicenter

Location

34.328°N 117.001°W

Depth

9.25 km (5.75 mi)

https://earthquake.usgs.gov/earthquakes/eventpage/ci41339975

M 1.2 - 7 km NE of Banning, CA

Time

2026-09-27 21:39:32 UTC

2026-09-27 21:39:32 UTC at epicenter

Location

33.975°N 116.830°W

Depth

18.42 km (11.45 mi)

https://earthquake.usgs.gov/earthquakes/eventpage/ci41339999

M 1.1 - 7 km NE of Banning, CA

Time

2026-09-27 21:40:01 UTC

2026-09-27 21:40:01 UTC at epicenter

Location

33.978°N 116.826°W

Depth

17.69 km (10.99 mi)

https://earthquake.usgs.gov/earthquakes/eventpage/ci41340007

M 1.7 - 9 km WNW of Anza, CA

Time

2026-09-28 02:42:40 UTC

2026-09-28 02:42:40 UTC at epicenter

Location

33.574°N 116.766°W

Depth

12.05 km (7.49 mi)

https://earthquake.usgs.gov/earthquakes/eventpage/ci41340071

M 0.5 - 3 km WSW of Anza, CA

Time

2026-09-27 23:12:22 UTC

2026-09-27 23:12:22 UTC at epicenter

Location

33.539°N 116.706°W

Depth

5.91 km (3.67 mi)

https://earthquake.usgs.gov/earthquakes/eventpage/ci41340023

M 0.8 - 2 km E of Loma Linda, CA

Time

2026-09-27 23:43:28 UTC

2026-09-27 23:43:28 UTC at epicenter

Location

34.047°N 117.243°W

Depth

15.73 km (9.77 mi)

https://earthquake.usgs.gov/earthquakes/eventpage/ci41340039

M 3.1 - 12 km SSE of Fern Forest, Hawaii

ShakeMap - IV DYFI? - III

Time

2026-09-27 13:30:35 UTC

2026-09-27 13:30:35 UTC at epicenter

Location

19.364°N 155.081°W

Depth

7.61 km (4.73 mi)

https://earthquake.usgs.gov/earthquakes/eventpage/hv75044217

M 0.8 - 4 km SW of Anza, CA

Time

2026-09-27 23:52:37 UTC

2026-09-27 23:52:37 UTC at epicenter

Location

33.535°N 116.707°W

Depth

5.51 km (3.42 mi)

https://earthquake.usgs.gov/earthquakes/eventpage/ci41340047

M 0.8 - 4 km NNW of Big Bear City, CA

Time

2026-09-28 00:47:47 UTC

2026-09-28 00:47:47 UTC at epicenter

Location

34.294°N 116.860°W

Depth

4.28 km (2.66 mi)

https://earthquake.usgs.gov/earthquakes/eventpage/ci41340055

M 0.8 - 4 km NNW of The Geysers, CA

Time

2026-09-28 13:32:23 UTC

2026-09-28 13:32:23 UTC at epicenter

Location

38.807°N 122.780°W

Depth

3.06 km (1.90 mi)

https://earthquake.usgs.gov/earthquakes/eventpage/nc75443827

M 1.1 - 11 km SSW of Idyllwild, CA

Time

2026-09-28 03:24:27 UTC

2026-09-28 03:24:27 UTC at epicenter

Location

33.649°N 116.763°W

Depth

14.24 km (8.85 mi)

https://earthquake.usgs.gov/earthquakes/eventpage/ci41340103

M 3.6 - 94 km SSW of Nikolski, Alaska

ShakeMap - II

Time

2026-09-03 13:20:25 UTC

2026-09-03 13:20:25 UTC at epicenter

Location

52.143°N 169.342°W

Depth

10.00 km (6.21 mi)

https://earthquake.usgs.gov/earthquakes/eventpage/us7000tdzc

M 0.8 - 4 km E of Calimesa, CA

Time

2026-09-28 05:48:56 UTC

2026-09-28 05:48:56 UTC at epicenter

Location

33.996°N 117.007°W

Depth

14.71 km (9.14 mi)

https://earthquake.usgs.gov/earthquakes/eventpage/ci41340135

M 5.2 - 102 km SSW of Nikolski, Alaska

ShakeMap - III

Time

2026-09-03 13:03:18 UTC

2026-09-03 13:03:18 UTC at epicenter

Location

52.048°N 169.226°W

Depth

10.00 km (6.21 mi)

https://earthquake.usgs.gov/earthquakes/eventpage/us7000tdys

M 0.2 - 9 km WNW of Anza, CA

Time

2026-09-28 04:24:52 UTC

2026-09-28 04:24:52 UTC at epicenter

Location

33.583°N 116.759°W

Depth

12.50 km (7.77 mi)

https://earthquake.usgs.gov/earthquakes/eventpage/ci41340127

M 2.3 - 8 km SSW of Pāhala, Hawaii

Time

2026-09-28 13:27:05 UTC

2026-09-28 13:27:05 UTC at epicenter

Location

19.137°N 155.512°W

Depth

32.90 km (20.44 mi)

https://earthquake.usgs.gov/earthquakes/eventpage/hv75044692

M 1.0 - 5 km E of Calimesa, CA

Time

2026-09-28 05:49:39 UTC

2026-09-28 05:49:39 UTC at epicenter

Location

33.994°N 117.005°W

Depth

14.29 km (8.88 mi)

https://earthquake.usgs.gov/earthquakes/eventpage/ci41340143