Earthquakes on March 21, 2026: 232 Worldwide, Largest M6.6

Time ↓	Mag ↕	Location ↕	Depth ↕	Felt ↕	MMI	Alert	Status	Details
2026-03-21 2026-03-21 23:46:38 UTC	2.9ml	143 km SE of Akutan, Alaska 53.265°, -164.177°	35.0 km	-	-	-	✓ Reviewed	USGS →
A magnitude 2.9 seismic event took place 143 km SE of Akutan, Alaska on March 21, 2026 at 23:46 UTC. The event originated approximately 35.0 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 53.265°N, -164.177°E. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data.
2026-03-21 2026-03-21 23:42:20 UTC	2.9ml	142 km SE of Akutan, Alaska 53.266°, -164.186°	35.0 km	-	-	-	✓ Reviewed	USGS →
March 21, 2026 brought a magnitude 2.9 earthquake 142 km SE of Akutan, Alaska, logged at 23:42 UTC. 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: 53.266°, -164.186°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data.
2026-03-21 2026-03-21 23:25:45 UTC	2.4ml	93 km SSW of Atka, Alaska 51.384°, -174.571°	8.3 km	-	-	-	✓ Reviewed	USGS →
Reports of a magnitude 2.4 earthquake 93 km SSW of Atka, Alaska came in on March 21, 2026 at 23:25 UTC. At a depth of 8.3 km, the event was shallow crustal. Coordinates: 51.384°, -174.571°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data.
2026-03-21 2026-03-21 23:09:19 UTC	2.3md	3 km W of Fuig, Puerto Rico 17.990°, -66.948°	10.4 km	-	-	-	✓ Reviewed	USGS →
Seismographs logged a magnitude 2.3 earthquake 3 km W of Fuig, Puerto Rico with origin time 23:09 UTC on March 21, 2026. This event falls inside the aftershock decay of a nearby magnitude 2.5 earthquake that occurred about 13 hours earlier. The event originated approximately 10.4 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 17.990°N, -66.948°E. 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.
2026-03-21 2026-03-21 23:05:39 UTC	2.8md	60 km W of Petrolia, CA 40.377°, -124.989°	13.8 km	-	-	-	✓ Reviewed	USGS →
This magnitude 2.8 event was detected 60 km W of Petrolia, CA on March 21, 2026, with origin time 23:05 UTC. The event originated approximately 13.8 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 40.377°, -124.989°. 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.
2026-03-21 2026-03-21 23:04:10 UTC	2.5ml	14 km W of Johannesburg, CA 35.360°, -117.787°	6.3 km	-	-	-	✓ Reviewed	USGS →
Seismographs logged a magnitude 2.5 earthquake 14 km W of Johannesburg, CA with origin time 23:04 UTC on March 21, 2026. The hypocenter lay at 6.3 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 35.360°, -117.787°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data.
2026-03-21 2026-03-21 23:03:01 UTC	4.3mb	Pulau Pulau Tanimbar, Indonesia -7.822°, 130.243°	10.0 km	-	-	-	✓ Reviewed	USGS →
Seismographs logged a magnitude 4.3 earthquake near Pulau Pulau Tanimbar, Indonesia with origin time 23:03 UTC on March 21, 2026. The event originated approximately 10.0 km below the surface, classifying it as shallow crustal. Geolocation places the event at -7.822°N, 130.243°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.
2026-03-21 2026-03-21 22:36:52 UTC	2.4ml	22 km ESE of Forsan, Texas 32.068°, -101.129°	8.5 km	-	-	-	✓ Reviewed	USGS →
A magnitude 2.4 seismic event took place 22 km ESE of Forsan, Texas on March 21, 2026 at 22:36 UTC. The event originated approximately 8.5 km below the surface, classifying it as shallow crustal. The epicenter is at 32.068°, -101.129°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data.
2026-03-21 2026-03-21 22:32:15 UTC	4.2mb	112 km WNW of Houma, Tonga -20.969°, -176.361°	218.4 km	-	-	-	✓ Reviewed	USGS →
On March 21, 2026, worldwide seismic activity registered a magnitude 4.2 earthquake 112 km WNW of Houma, Tonga at 22:32 UTC. At a depth of 218.4 km, the event was intermediate depth. The epicenter is at -20.969°, -176.361°. 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.
2026-03-21 2026-03-21 22:25:09 UTC	4.3mb	88 km WSW of Buala, Solomon Islands -8.498°, 158.876°	101.5 km	-	-	-	✓ Reviewed	USGS →
On March 21, 2026, worldwide seismic activity registered a magnitude 4.3 earthquake 88 km WSW of Buala, Solomon Islands at 22:25 UTC. This was a intermediate depth earthquake, focused at 101.5 km depth. Coordinates: -8.498°, 158.876°. 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.
2026-03-21 2026-03-21 22:15:57 UTC	2.9ml	61 km WNW of Happy Valley, Alaska 60.144°, -152.772°	113.4 km	-	-	-	✓ Reviewed	USGS →
On March 21, 2026 at 22:15 UTC, a magnitude 2.9 earthquake struck 61 km WNW of Happy Valley, Alaska. The hypocenter lay at 113.4 km, placing this in the intermediate depth category. The epicenter is at 60.144°, -152.772°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data.
2026-03-21 2026-03-21 21:40:08 UTC	2.0ml	65 km SE of Cantwell, Alaska 62.911°, -148.203°	0.6 km	-	-	-	✓ Reviewed	USGS →
A magnitude 2.0 seismic event took place 65 km SE of Cantwell, Alaska on March 21, 2026 at 21:40 UTC. At a depth of just 0.6 km, this was a very shallow event, close enough to the surface that modest magnitudes can produce significant local shaking. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. The epicenter is at 62.911°, -148.203°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data.
2026-03-21 2026-03-21 21:38:36 UTC	4.5mb	Kermadec Islands region -28.763°, -176.537°	10.0 km	-	-	-	✓ Reviewed	USGS →
At 21:38 UTC on March 21, 2026, a magnitude 4.5 tremor occurred in the Kermadec Islands region. The event originated approximately 10.0 km below the surface, classifying it as shallow crustal. Coordinates: -28.763°, -176.537°. 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.
2026-03-21 2026-03-21 21:32:11 UTC	2.0ml	20 km ENE of Chickaloon, Alaska 61.834°, -148.076°	22.3 km	-	-	-	Auto	USGS →
March 21, 2026 brought a magnitude 2.0 earthquake 20 km ENE of Chickaloon, Alaska, logged at 21:32 UTC. At a depth of 22.3 km, the event was shallow crustal. Geolocation places the event at 61.834°N, -148.076°E. The automatic solution is preliminary and may be refined as additional station data arrives. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data.
2026-03-21 2026-03-21 21:13:05 UTC	4.2mb	46 km WSW of Jurm, Afghanistan 36.667°, 70.379°	200.2 km	-	-	-	✓ Reviewed	USGS →
At 21:13 UTC on March 21, 2026, a magnitude 4.2 tremor occurred 46 km WSW of Jurm, Afghanistan. The event originated approximately 200.2 km below the surface, classifying it as intermediate depth. Geolocation places the event at 36.667°N, 70.379°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.
2026-03-21 2026-03-21 20:35:51 UTC	2.0ml	109 km N of Yakutat, Alaska 60.525°, -139.841°	6.1 km	-	-	-	✓ Reviewed	USGS →
On March 21, 2026 at 20:35 UTC, a magnitude 2.0 earthquake struck 109 km N of Yakutat, Alaska. Coming 3 hours after a magnitude 2.2 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event originated approximately 6.1 km below the surface, classifying it as shallow crustal. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. Coordinates: 60.525°, -139.841°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data.
2026-03-21 2026-03-21 20:07:25 UTC	5.0mb	Kermadec Islands region -29.245°, -179.052°	303.1 km	-	-	-	✓ Reviewed	USGS →
This magnitude 5.0 event was detected in the Kermadec Islands region on March 21, 2026, with origin time 20:07 UTC. At 303.1 km, this deep-focus earthquake originated far below the brittle crust, deep inside the mantle. The epicenter is at -29.245°, -179.052°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M5.0 event page for the full report, ShakeMap, and citizen-reported intensity data.
2026-03-21 2026-03-21 20:04:55 UTC	4.3mb	266 km SE of Vilyuchinsk, Russia 51.204°, 161.103°	10.0 km	-	-	-	✓ Reviewed	USGS →
At 20:04 UTC on March 21, 2026, a magnitude 4.3 tremor occurred 266 km SE of Vilyuchinsk, Russia. The hypocenter lay at 10.0 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 51.204°, 161.103°. 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.
2026-03-21 2026-03-21 20:04:01 UTC	4.1mb	Banda Sea -6.763°, 129.657°	148.6 km	-	-	-	✓ Reviewed	USGS →
On March 21, 2026 at 20:04 UTC, a magnitude 4.1 earthquake struck near Banda Sea. The hypocenter lay at 148.6 km, placing this in the intermediate depth category. Geolocation places the event at -6.763°N, 129.657°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.
2026-03-21 2026-03-21 19:53:58 UTC	4.2mb	128 km SSW of Luwuk, Indonesia -2.081°, 122.520°	10.0 km	-	-	-	✓ Reviewed	USGS →
The USGS recorded this magnitude 4.2 earthquake 128 km SSW of Luwuk, Indonesia at 19:53 UTC on March 21, 2026. This was a shallow crustal earthquake, focused at 10.0 km depth. Coordinates: -2.081°, 122.520°. 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.
2026-03-21 2026-03-21 19:47:09 UTC	4.5mb	62 km SW of Atocha, Bolivia -21.331°, -66.649°	228.2 km	-	-	-	✓ Reviewed	USGS →
The USGS recorded this magnitude 4.5 earthquake 62 km SW of Atocha, Bolivia at 19:47 UTC on March 21, 2026. This was a intermediate depth earthquake, focused at 228.2 km depth. The offshore location combined with this depth is characteristic of seismicity along descending slabs. The epicenter is at -21.331°, -66.649°. 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.
2026-03-21 2026-03-21 19:39:26 UTC	2.3ml	53 km E of Pedro Bay, Alaska 59.753°, -153.155°	123.3 km	-	-	-	✓ Reviewed	USGS →
On March 21, 2026, worldwide seismic activity registered a magnitude 2.3 earthquake 53 km E of Pedro Bay, Alaska at 19:39 UTC. This was a intermediate depth earthquake, focused at 123.3 km depth. The offshore location combined with this depth is characteristic of seismicity along descending slabs. Coordinates: 59.753°, -153.155°. 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.
2026-03-21 2026-03-21 19:36:40 UTC	2.4ml	38 km ESE of Ugashik, Alaska 57.411°, -156.787°	124.5 km	-	-	-	✓ Reviewed	USGS →
March 21, 2026 brought a magnitude 2.4 earthquake 38 km ESE of Ugashik, Alaska, logged at 19:36 UTC. This was a intermediate depth earthquake, focused at 124.5 km depth. Geolocation places the event at 57.411°N, -156.787°E. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data.
2026-03-21 2026-03-21 19:14:45 UTC	4.3mb	43 km S of Metahāra, Ethiopia 8.509°, 39.962°	10.0 km	-	-	-	✓ Reviewed	USGS →
The USGS recorded this magnitude 4.3 earthquake 43 km S of Metahāra, Ethiopia at 19:14 UTC on March 21, 2026. 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 8.509°N, 39.962°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.
2026-03-21 2026-03-21 19:06:57 UTC	2.3ml	86 km SW of Adak, Alaska 51.364°, -177.586°	28.7 km	-	-	-	✓ Reviewed	USGS →
At 19:06 UTC on March 21, 2026, a magnitude 2.3 tremor occurred 86 km SW of Adak, Alaska. The hypocenter lay at 28.7 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 51.364°, -177.586°. 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.
2026-03-21 2026-03-21 18:23:27 UTC	2.6ml	36 km ENE of Ouzinkie, Alaska 58.081°, -151.965°	1.2 km	-	-	-	✓ Reviewed	USGS →
On March 21, 2026 at 18:23 UTC, a magnitude 2.6 earthquake struck 36 km ENE of Ouzinkie, Alaska. At a depth of just 1.2 km, this was a very shallow event, close enough to the surface that modest magnitudes can produce significant local shaking. Geolocation places the event at 58.081°N, -151.965°E. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data.
2026-03-21 2026-03-21 18:08:53 UTC	5.1mww	158 km SW of Labuan, Indonesia -7.550°, 105.003°	10.0 km	2	-	-	✓ Reviewed	USGS →
The USGS recorded this magnitude 5.1 earthquake 158 km SW of Labuan, Indonesia at 18:08 UTC on March 21, 2026. A small number of nearby observers (2) submitted felt reports to the USGS. 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: -7.550°, 105.003°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M5.1 event page for the full report, ShakeMap, and citizen-reported intensity data.
2026-03-21 2026-03-21 18:04:52 UTC	4.3mb	1 km SSE of Reitano, Italy 37.956°, 14.355°	10.0 km	-	-	-	✓ Reviewed	USGS →
This magnitude 4.3 event was detected 1 km SSE of Reitano, Italy on March 21, 2026, with origin time 18:04 UTC. The event originated approximately 10.0 km below the surface, classifying it as shallow crustal. Coordinates: 37.956°, 14.355°. 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.
2026-03-21 2026-03-21 17:52:44 UTC	2.2ml	67 km SSE of Kokhanok, Alaska 58.853°, -154.513°	124.2 km	-	-	-	✓ Reviewed	USGS →
A magnitude 2.2 earthquake was recorded 67 km SSE of Kokhanok, Alaska on March 21, 2026 at 17:52 UTC. This was a intermediate depth earthquake, focused at 124.2 km depth. Geolocation places the event at 58.853°N, -154.513°E. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data.
2026-03-21 2026-03-21 17:48:27 UTC	2.0ml	55 km E of Pedro Bay, Alaska 59.783°, -153.124°	119.1 km	-	-	-	✓ Reviewed	USGS →
A magnitude 2.0 earthquake was recorded 55 km E of Pedro Bay, Alaska on March 21, 2026 at 17:48 UTC. This was a intermediate depth earthquake, focused at 119.1 km depth. The offshore location combined with this depth is characteristic of seismicity along descending slabs. The epicenter is at 59.783°, -153.124°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.0 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 March 21, 2026. 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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