Earthquakes on September 20, 2025: 225 Worldwide, Largest M5.2

Time ↓	Mag ↕	Location ↕	Depth ↕	Felt ↕	MMI	Alert	Status	Details
2025-09-20 2025-09-20 23:30:31 UTC	4.3mb	168 km E of Petropavlovsk-Kamchatsky, Russia 52.972°, 161.128°	10.0 km	-	-	-	✓ Reviewed	USGS →
This magnitude 4.3 event was detected 168 km E of Petropavlovsk-Kamchatsky, Russia on September 20, 2025, with origin time 23:30 UTC. This event falls inside the aftershock decay of a nearby magnitude 5.0 earthquake that occurred about 17 hours earlier. The event originated approximately 10.0 km below the surface, classifying it as shallow crustal. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. Geolocation places the event at 52.972°N, 161.128°E. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data.
2025-09-20 2025-09-20 23:23:55 UTC	4.1mwr	37 km E of Camiña, Chile -19.372°, -69.073°	9.8 km	-	-	-	✓ Reviewed	USGS →
At 23:23 UTC on September 20, 2025, a magnitude 4.1 tremor occurred 37 km E of Camiña, Chile. The hypocenter lay at 9.8 km, placing this in the shallow crustal category. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. Geolocation places the event at -19.372°N, -69.073°E. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data.
2025-09-20 2025-09-20 23:16:23 UTC	4.1mb	15 km N of Simav, Turkey 39.229°, 28.970°	10.0 km	-	-	-	✓ Reviewed	USGS →
The USGS recorded this magnitude 4.1 earthquake 15 km N of Simav, Turkey at 23:16 UTC on September 20, 2025. At a depth of 10.0 km, the event was shallow crustal. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. Coordinates: 39.229°, 28.970°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data.
2025-09-20 2025-09-20 22:13:05 UTC	2.3md	3 km SW of Indios, Puerto Rico 17.975°, -66.845°	18.0 km	-	-	-	✓ Reviewed	USGS →
Seismographs logged a magnitude 2.3 earthquake 3 km SW of Indios, Puerto Rico with origin time 22:13 UTC on September 20, 2025. Coming 8 hours after a magnitude 2.7 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The hypocenter lay at 18.0 km, placing this in the shallow crustal category. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. Coordinates: 17.975°, -66.845°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data.
2025-09-20 2025-09-20 21:47:34 UTC	4.4mb	162 km SSE of Vilyuchinsk, Russia 51.567°, 159.248°	35.0 km	-	-	-	✓ Reviewed	USGS →
At 21:47 UTC on September 20, 2025, a magnitude 4.4 tremor occurred 162 km SSE of Vilyuchinsk, Russia. The event originated approximately 35.0 km below the surface, classifying it as shallow crustal. Geolocation places the event at 51.567°N, 159.248°E. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data.
2025-09-20 2025-09-20 21:47:23 UTC	4.4mb	14 km NE of Kuji, Japan 40.292°, 141.869°	35.0 km	-	-	-	✓ Reviewed	USGS →
The USGS recorded this magnitude 4.4 earthquake 14 km NE of Kuji, Japan at 21:47 UTC on September 20, 2025. This was a shallow crustal earthquake, focused at 35.0 km depth. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. Coordinates: 40.292°, 141.869°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data.
2025-09-20 2025-09-20 21:28:07 UTC	2.8md	9 km SSW of Mariposa, CA 37.408°, -120.007°	21.1 km	32	-	-	✓ Reviewed	USGS →
A magnitude 2.8 earthquake was recorded 9 km SSW of Mariposa, CA on September 20, 2025 at 21:28 UTC. Of every earthquake currently listed for worldwide seismic activity, this one generated the most felt reports from the public. 32 people reported feeling the earthquake via the USGS Did You Feel It? system. At a depth of 21.1 km, the event was shallow crustal. The epicenter is at 37.408°, -120.007°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data.
2025-09-20 2025-09-20 21:11:40 UTC	4.2mb	4 km SSE of San Terenziano, Italy 42.827°, 12.492°	10.0 km	6	-	-	✓ Reviewed	USGS →
A magnitude 4.2 seismic event took place 4 km SSE of San Terenziano, Italy on September 20, 2025 at 21:11 UTC. A small number of nearby observers (6) submitted felt reports to the USGS. The event originated approximately 10.0 km below the surface, classifying it as shallow crustal. Geolocation places the event at 42.827°N, 12.492°E. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data.
2025-09-20 2025-09-20 20:37:56 UTC	4.3mb	162 km SE of Petropavlovsk-Kamchatsky, Russia 52.250°, 160.619°	35.0 km	-	-	-	✓ Reviewed	USGS →
Reports of a magnitude 4.3 earthquake 162 km SE of Petropavlovsk-Kamchatsky, Russia came in on September 20, 2025 at 20:37 UTC. Coming 4 hours after a magnitude 4.4 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. This was a shallow crustal earthquake, focused at 35.0 km depth. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. Coordinates: 52.250°, 160.619°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data.
2025-09-20 2025-09-20 20:29:46 UTC	4.2mwr	101 km SSE of Sand Point, Alaska 54.489°, -159.918°	35.0 km	-	II	-	✓ Reviewed	USGS →
September 20, 2025 brought a magnitude 4.2 earthquake 101 km SSE of Sand Point, Alaska, logged at 20:29 UTC. Peak ground motion corresponded to MMI 2.8, classified as weak shaking. This was a shallow crustal earthquake, focused at 35.0 km depth. Coordinates: 54.489°, -159.918°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data.
2025-09-20 2025-09-20 20:01:18 UTC	3.6mb	66 km SW of Nikolski, Alaska 52.548°, -169.607°	35.0 km	-	I	-	✓ Reviewed	USGS →
Seismographs logged a magnitude 3.6 earthquake 66 km SW of Nikolski, Alaska with origin time 20:01 UTC on September 20, 2025. Maximum shaking intensity peaked at MMI 2.0 (weak). The hypocenter lay at 35.0 km, placing this in the shallow crustal category. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. The epicenter is at 52.548°, -169.607°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M3.6 event page for the full report, ShakeMap, and citizen-reported intensity data.
2025-09-20 2025-09-20 19:45:18 UTC	3.6md	140 km N of Isabela, Puerto Rico 19.758°, -66.857°	42.0 km	-	-	-	✓ Reviewed	USGS →
On September 20, 2025, worldwide seismic activity registered a magnitude 3.6 earthquake 140 km N of Isabela, Puerto Rico at 19:45 UTC. At a depth of 42.0 km, the event was shallow crustal. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. Geolocation places the event at 19.758°N, -66.857°E. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M3.6 event page for the full report, ShakeMap, and citizen-reported intensity data.
2025-09-20 2025-09-20 18:54:34 UTC	4.3mb	135 km SSW of Tambilil, Philippines 4.873°, 124.109°	452.3 km	-	-	-	✓ Reviewed	USGS →
A magnitude 4.3 seismic event took place 135 km SSW of Tambilil, Philippines on September 20, 2025 at 18:54 UTC. At 452.3 km, this deep-focus earthquake originated far below the brittle crust, deep inside the mantle. The epicenter is at 4.873°, 124.109°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data.
2025-09-20 2025-09-20 18:30:00 UTC	3.3ml	22 km SSW of Nixon, Texas 29.073°, -97.812°	5.8 km	6	-	-	✓ Reviewed	USGS →
This magnitude 3.3 event was detected 22 km SSW of Nixon, Texas on September 20, 2025, with origin time 18:30 UTC. In the 72 hours after this event, the USGS recorded 5 smaller earthquakes within 20 km, consistent with an ongoing aftershock sequence rooted here. A small number of nearby observers (6) submitted felt reports to the USGS. The hypocenter lay at 5.8 km, placing this in the shallow crustal category. Geolocation places the event at 29.073°N, -97.812°E. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M3.3 event page for the full report, ShakeMap, and citizen-reported intensity data.
2025-09-20 2025-09-20 17:49:16 UTC	4.5mb	85 km SSW of Severo-Kuril’sk, Russia 49.949°, 155.714°	82.5 km	-	-	-	✓ Reviewed	USGS →
This magnitude 4.5 event was detected 85 km SSW of Severo-Kuril’sk, Russia on September 20, 2025, with origin time 17:49 UTC. The event originated approximately 82.5 km below the surface, classifying it as intermediate depth. Coordinates: 49.949°, 155.714°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data.
2025-09-20 2025-09-20 17:09:22 UTC	4.8mb	77 km E of Petropavlovsk-Kamchatsky, Russia 53.093°, 159.776°	75.7 km	-	-	-	✓ Reviewed	USGS →
Seismographs logged a magnitude 4.8 earthquake 77 km E of Petropavlovsk-Kamchatsky, Russia with origin time 17:09 UTC on September 20, 2025. It arrived roughly 14 hours after a larger magnitude 5.1 mainshock in the same 20 km area, placing it within the typical aftershock window. The hypocenter lay at 75.7 km, placing this in the intermediate depth category. The offshore location combined with this depth is characteristic of seismicity along descending slabs. The epicenter is at 53.093°, 159.776°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M4.8 event page for the full report, ShakeMap, and citizen-reported intensity data.
2025-09-20 2025-09-20 16:56:44 UTC	4.4mb	163 km ESE of Petropavlovsk-Kamchatsky, Russia 52.276°, 160.671°	22.3 km	-	-	-	✓ Reviewed	USGS →
This magnitude 4.4 event was detected 163 km ESE of Petropavlovsk-Kamchatsky, Russia on September 20, 2025, with origin time 16:56 UTC. The hypocenter lay at 22.3 km, placing this in the shallow crustal category. The epicenter is at 52.276°, 160.671°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data.
2025-09-20 2025-09-20 16:56:17 UTC	4.6mb	Kermadec Islands region -31.871°, -178.649°	39.2 km	-	-	-	✓ Reviewed	USGS →
Reports of a magnitude 4.6 earthquake in the Kermadec Islands region came in on September 20, 2025 at 16:56 UTC. At a depth of 39.2 km, the event was shallow crustal. Coordinates: -31.871°, -178.649°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data.
2025-09-20 2025-09-20 16:47:45 UTC	4.1mb	16 km W of Cicurug, Indonesia -6.768°, 106.636°	7.4 km	-	-	-	✓ Reviewed	USGS →
This magnitude 4.1 event was detected 16 km W of Cicurug, Indonesia on September 20, 2025, with origin time 16:47 UTC. The event originated approximately 7.4 km below the surface, classifying it as shallow crustal. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. The epicenter is at -6.768°, 106.636°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data.
2025-09-20 2025-09-20 16:39:41 UTC	4.6mb	88 km SE of Alo, Wallis and Futuna -14.908°, -177.561°	377.9 km	-	-	-	✓ Reviewed	USGS →
A magnitude 4.6 seismic event took place 88 km SE of Alo, Wallis and Futuna on September 20, 2025 at 16:39 UTC. At 377.9 km, this deep-focus earthquake originated far below the brittle crust, deep inside the mantle. The offshore location combined with this depth is characteristic of seismicity along descending slabs. The epicenter is at -14.908°, -177.561°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data.
2025-09-20 2025-09-20 16:36:42 UTC	4.6mb	157 km E of Petropavlovsk-Kamchatsky, Russia 53.104°, 160.978°	40.7 km	-	-	-	✓ Reviewed	USGS →
September 20, 2025 brought a magnitude 4.6 earthquake 157 km E of Petropavlovsk-Kamchatsky, Russia, logged at 16:36 UTC. This was a shallow crustal earthquake, focused at 40.7 km depth. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. Geolocation places the event at 53.104°N, 160.978°E. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data.
2025-09-20 2025-09-20 16:07:54 UTC	4.2mb	79 km E of Petropavlovsk-Kamchatsky, Russia 53.016°, 159.806°	67.1 km	-	-	-	✓ Reviewed	USGS →
On September 20, 2025 at 16:07 UTC, a magnitude 4.2 earthquake struck 79 km E of Petropavlovsk-Kamchatsky, Russia. It arrived roughly 13 hours after a larger magnitude 5.1 mainshock in the same 20 km area, placing it within the typical aftershock window. The hypocenter lay at 67.1 km, placing this in the shallow crustal category. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. The epicenter is at 53.016°, 159.806°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data.
2025-09-20 2025-09-20 15:41:49 UTC	4.5mb	71 km SSW of San Pedro de Atacama, Chile -23.448°, -68.581°	104.8 km	1	-	-	✓ Reviewed	USGS →
Reports of a magnitude 4.5 earthquake 71 km SSW of San Pedro de Atacama, Chile came in on September 20, 2025 at 15:41 UTC. A small number of nearby observers (1) submitted felt reports to the USGS. This was a intermediate depth earthquake, focused at 104.8 km depth. The epicenter is at -23.448°, -68.581°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data.
2025-09-20 2025-09-20 15:38:28 UTC	4.3mb	195 km N of Kavieng, Papua New Guinea -0.825°, 150.551°	10.0 km	-	-	-	✓ Reviewed	USGS →
September 20, 2025 brought a magnitude 4.3 earthquake 195 km N of Kavieng, Papua New Guinea, logged at 15:38 UTC. At a depth of 10.0 km, the event was shallow crustal. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. Geolocation places the event at -0.825°N, 150.551°E. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data.
2025-09-20 2025-09-20 15:37:56 UTC	4.4mb	163 km SSE of Alo, Wallis and Futuna -15.608°, -177.383°	422.5 km	-	-	-	✓ Reviewed	USGS →
Reports of a magnitude 4.4 earthquake 163 km SSE of Alo, Wallis and Futuna came in on September 20, 2025 at 15:37 UTC. At 422.5 km, this deep-focus earthquake originated far below the brittle crust, deep inside the mantle. Geolocation places the event at -15.608°N, -177.383°E. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data.
2025-09-20 2025-09-20 15:31:09 UTC	5.2mb	South Sandwich Islands region -58.059°, -24.622°	10.0 km	-	-	-	✓ Reviewed	USGS →
On September 20, 2025 at 15:31 UTC, a magnitude 5.2 earthquake struck in the South Sandwich Islands region. It is the largest earthquake currently listed for worldwide seismic activity on September 20, 2025. The hypocenter lay at 10.0 km, placing this in the shallow crustal category. The epicenter is at -58.059°, -24.622°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M5.2 event page for the full report, ShakeMap, and citizen-reported intensity data.
2025-09-20 2025-09-20 15:15:12 UTC	3.3ml	51 km NNE of Venetie, Alaska 67.457°, -146.105°	9.6 km	-	-	-	✓ Reviewed	USGS →
Reports of a magnitude 3.3 earthquake 51 km NNE of Venetie, Alaska came in on September 20, 2025 at 15:15 UTC. At a depth of 9.6 km, the event was shallow crustal. Coordinates: 67.457°, -146.105°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M3.3 event page for the full report, ShakeMap, and citizen-reported intensity data.
2025-09-20 2025-09-20 15:05:03 UTC	4.5mb	91 km E of Petropavlovsk-Kamchatsky, Russia 53.049°, 159.998°	53.1 km	-	-	-	✓ Reviewed	USGS →
A magnitude 4.5 seismic event took place 91 km E of Petropavlovsk-Kamchatsky, Russia on September 20, 2025 at 15:05 UTC. This event falls inside the aftershock decay of a nearby magnitude 5.1 earthquake that occurred about 12 hours earlier. The hypocenter lay at 53.1 km, placing this in the shallow crustal category. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. Geolocation places the event at 53.049°N, 159.998°E. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data.
2025-09-20 2025-09-20 14:44:03 UTC	4.3mb	central Mid-Atlantic Ridge -0.968°, -21.963°	10.0 km	-	-	-	✓ Reviewed	USGS →
On September 20, 2025 at 14:44 UTC, a magnitude 4.3 earthquake struck near central Mid-Atlantic Ridge. The event originated approximately 10.0 km below the surface, classifying it as shallow crustal. Coordinates: -0.968°, -21.963°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data.
2025-09-20 2025-09-20 14:43:38 UTC	2.1md	24 km NW of Petrolia, CA 40.449°, -124.513°	20.3 km	-	-	-	✓ Reviewed	USGS →
At 14:43 UTC on September 20, 2025, a magnitude 2.1 tremor occurred 24 km NW of Petrolia, CA. The event originated approximately 20.3 km below the surface, classifying it as shallow crustal. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. Geolocation places the event at 40.449°N, -124.513°E. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data.

Legend:

Mag: Magnitude ({magType} = ml, mb, mw, etc.)

Felt: Number of DYFI felt reports

MMI: Modified Mercalli Intensity (I-X+)

Alert: PAGER alert level

Depth: Shallow (<70km), Intermediate, Deep (>300km)

Status: Auto = preliminary, Reviewed = verified by seismologist

Click any row to see additional technical details.

About This Page

This page shows all earthquakes recorded by the USGS Earthquake Hazards Program during the 24-hour UTC period on September 20, 2025. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.

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