Time ↓	Mag ↕	Location ↕	Depth ↕	Felt ↕	MMI	Alert	Status	Details
2021-10-21 2021-10-21 23:51:47 UTC	2.2md	4 km SW of Volcano, Hawaii 19.414°, -155.260°	12.8 km	-	-	-	✓ Reviewed	USGS →
The USGS recorded this magnitude 2.2 earthquake 4 km SW of Volcano, Hawaii at 23:51 UTC on October 21, 2021. It arrived roughly 6 hours after a larger magnitude 3.0 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-10-21 2021-10-21 23:38:28 UTC	2.6ml	54 km W of Nanwalek, Alaska 59.282°, -152.862°	80.0 km	-	-	-	✓ Reviewed	USGS →
At 23:38 UTC on October 21, 2021, a magnitude 2.6 tremor occurred 54 km W of Nanwalek, Alaska. The event was offshore. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-10-21 2021-10-21 23:31:59 UTC	2.8ml	65 km N of Petersville, Alaska 63.079°, -150.823°	122.0 km	-	-	-	✓ Reviewed	USGS →
On October 21, 2021 at 23:31 UTC, a magnitude 2.8 earthquake struck 65 km N of Petersville, Alaska. The event was offshore. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-10-21 2021-10-21 23:05:34 UTC	4.4mb	294 km NE of Hadibu, Yemen 14.342°, 56.117°	10.0 km	-	-	-	✓ Reviewed	USGS →
Seismographs logged a magnitude 4.4 earthquake 294 km NE of Hadibu, Yemen with origin time 23:05 UTC on October 21, 2021. The event was offshore. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-10-21 2021-10-21 22:59:06 UTC	2.0ml	119 km N of Ambler, Alaska 68.155°, -157.936°	9.7 km	-	-	-	✓ Reviewed	USGS →
A magnitude 2.0 earthquake was recorded 119 km N of Ambler, Alaska on October 21, 2021 at 22:59 UTC. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-10-21 2021-10-21 22:55:30 UTC	4.4mb	Fiji region -18.772°, -177.661°	569.6 km	-	-	-	✓ Reviewed	USGS →
On October 21, 2021, worldwide seismic activity registered a magnitude 4.4 earthquake in the Fiji region at 22:55 UTC. This is the deepest earthquake in the current dataset — a deep-focus event. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-10-21 2021-10-21 22:35:35 UTC	2.8ml	14km NNE of Shaver Lake, CA 37.223°, -119.277°	13.5 km	6	-	-	✓ Reviewed	USGS →
Seismographs logged a magnitude 2.8 earthquake 14km NNE of Shaver Lake, CA with origin time 22:35 UTC on October 21, 2021. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-10-21 2021-10-21 22:23:16 UTC	2.4ml	56 km NW of Toyah, Texas 31.649°, -104.236°	7.3 km	-	-	-	✓ Reviewed	USGS →
At 22:23 UTC on October 21, 2021, a magnitude 2.4 tremor occurred 56 km NW of Toyah, Texas. This event falls inside the aftershock decay of a nearby magnitude 3.2 earthquake that occurred about 7 hours earlier. The event was offshore. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-10-21 2021-10-21 21:58:20 UTC	5.6mww	63 km E of Waitara, New Zealand -39.020°, 174.976°	224.2 km	35	III	green	✓ Reviewed	USGS →
A magnitude 5.6 earthquake was recorded 63 km E of Waitara, New Zealand on October 21, 2021 at 21:58 UTC. The USGS PAGER system assigned a green alert level for this event, signalling no significant casualties or damage expected. The event was offshore. See the M5.6 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-10-21 2021-10-21 21:31:35 UTC	2.1ml	73 km NNE of Petersville, Alaska 63.142°, -150.429°	102.7 km	-	-	-	✓ Reviewed	USGS →
On October 21, 2021 at 21:31 UTC, a magnitude 2.1 earthquake struck 73 km NNE of Petersville, Alaska. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-10-21 2021-10-21 21:12:44 UTC	4.1mb	168 km NNW of Neiafu, Tonga -17.340°, -174.796°	308.3 km	-	-	-	✓ Reviewed	USGS →
A magnitude 4.1 earthquake was recorded 168 km NNW of Neiafu, Tonga on October 21, 2021 at 21:12 UTC. This deep-focus earthquake originated far below the brittle crust, deep inside the mantle. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-10-21 2021-10-21 20:38:35 UTC	2.1ml	54 km S of Whites City, New Mexico 31.683°, -104.431°	7.1 km	-	-	-	✓ Reviewed	USGS →
A magnitude 2.1 earthquake was recorded 54 km S of Whites City, New Mexico on October 21, 2021 at 20:38 UTC. It arrived roughly 3 hours after a larger magnitude 3.2 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-10-21 2021-10-21 20:31:53 UTC	4.3mb	186 km ESE of Kokopo, Papua New Guinea -5.053°, 153.795°	70.6 km	-	-	-	✓ Reviewed	USGS →
On October 21, 2021 at 20:31 UTC, a magnitude 4.3 earthquake struck 186 km ESE of Kokopo, Papua New Guinea. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-10-21 2021-10-21 20:30:26 UTC	2.1ml	5 km ESE of P?hala, Hawaii 19.189°, -155.429°	32.8 km	-	-	-	Auto	USGS →
October 21, 2021 brought a magnitude 2.1 earthquake 5 km ESE of P?hala, Hawaii, logged at 20:30 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.4 earthquake that occurred about 16 hours earlier. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-10-21 2021-10-21 20:28:44 UTC	2.0ml	17 km E of Ninilchik, Alaska 60.073°, -151.355°	52.2 km	-	-	-	✓ Reviewed	USGS →
Seismographs logged a magnitude 2.0 earthquake 17 km E of Ninilchik, Alaska with origin time 20:28 UTC on October 21, 2021. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-10-21 2021-10-21 20:23:15 UTC	2.5ml	86 km NW of Aleneva, Alaska 58.652°, -153.855°	77.7 km	-	-	-	✓ Reviewed	USGS →
Reports of a magnitude 2.5 earthquake 86 km NW of Aleneva, Alaska came in on October 21, 2021 at 20:23 UTC. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-10-21 2021-10-21 20:22:08 UTC	4.4mb	12 km SSE of La Línea, Mexico 16.025°, -94.003°	84.9 km	1	-	-	✓ Reviewed	USGS →
At 20:22 UTC on October 21, 2021, a magnitude 4.4 tremor occurred 12 km SSE of La Línea, Mexico. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-10-21 2021-10-21 19:34:36 UTC	4.3mb	118 km S of Katabu, Indonesia -6.002°, 122.532°	10.0 km	-	-	-	✓ Reviewed	USGS →
A magnitude 4.3 earthquake was recorded 118 km S of Katabu, Indonesia on October 21, 2021 at 19:34 UTC. The event was offshore. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-10-21 2021-10-21 19:10:31 UTC	2.1ml	15 km SSE of Sunnyside, Utah 39.429°, -110.304°	-1.9 km	-	-	-	✓ Reviewed	USGS →
This magnitude 2.1 event was detected 15 km SSE of Sunnyside, Utah on October 21, 2021, with origin time 19:10 UTC. In the 72 hours after this event, the USGS recorded 3 smaller earthquakes within 20 km, consistent with an ongoing aftershock sequence rooted here. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-10-21 2021-10-21 18:44:34 UTC	4.4ml	60 km SSE of Cantwell, Alaska 62.928°, -148.325°	72.4 km	43	III	green	✓ Reviewed	USGS →
The USGS recorded this magnitude 4.4 earthquake 60 km SSE of Cantwell, Alaska at 18:44 UTC on October 21, 2021. The USGS PAGER system assigned a green alert level for this event, signalling no significant casualties or damage expected. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-10-21 2021-10-21 18:19:06 UTC	4.1mb	83 km E of Lakatoro, Vanuatu -16.091°, 168.197°	179.9 km	-	-	-	✓ Reviewed	USGS →
Seismographs logged a magnitude 4.1 earthquake 83 km E of Lakatoro, Vanuatu with origin time 18:19 UTC on October 21, 2021. The event was offshore. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-10-21 2021-10-21 18:17:27 UTC	4.5mb	Kermadec Islands region -28.794°, -177.096°	35.0 km	-	-	-	✓ Reviewed	USGS →
October 21, 2021 brought a magnitude 4.5 earthquake in the Kermadec Islands region, logged at 18:17 UTC. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-10-21 2021-10-21 18:01:20 UTC	4.0mb	Rat Islands, Aleutian Islands, Alaska 51.810°, 178.429°	97.1 km	-	-	-	✓ Reviewed	USGS →
At 18:01 UTC on October 21, 2021, a magnitude 4.0 tremor occurred near Rat Islands, Aleutian Islands, Alaska. See the M4.0 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-10-21 2021-10-21 18:00:20 UTC	4.4mb	61 km SW of Basco, Philippines 20.094°, 121.516°	32.1 km	-	-	-	✓ Reviewed	USGS →
This magnitude 4.4 event was detected 61 km SW of Basco, Philippines on October 21, 2021, with origin time 18:00 UTC. The event was offshore. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-10-21 2021-10-21 17:56:08 UTC	3.2ml	48 km SSW of Whites City, New Mexico 31.774°, -104.590°	4.0 km	-	-	-	✓ Reviewed	USGS →
October 21, 2021 brought a magnitude 3.2 earthquake 48 km SSW of Whites City, New Mexico, logged at 17:56 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M3.2 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-10-21 2021-10-21 17:46:06 UTC	4.2mb	85 km W of Murghob, Tajikistan 38.173°, 72.993°	59.0 km	-	-	-	✓ Reviewed	USGS →
At 17:46 UTC on October 21, 2021, a magnitude 4.2 tremor occurred 85 km W of Murghob, Tajikistan. The event was offshore. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-10-21 2021-10-21 17:37:36 UTC	2.1ml	17 km NW of Susitna, Alaska 61.673°, -150.709°	57.2 km	-	-	-	✓ Reviewed	USGS →
Seismographs logged a magnitude 2.1 earthquake 17 km NW of Susitna, Alaska with origin time 17:37 UTC on October 21, 2021. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-10-21 2021-10-21 17:28:38 UTC	3.0ml	14 km SSE of Volcano, Hawaii 19.321°, -155.188°	1.6 km	2	-	-	✓ Reviewed	USGS →
Reports of a magnitude 3.0 earthquake 14 km SSE of Volcano, Hawaii came in on October 21, 2021 at 17:28 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-10-21 2021-10-21 17:22:23 UTC	2.4ml	10km NNW of Anza, CA 33.633°, -116.717°	14.6 km	5	-	-	✓ Reviewed	USGS →
Seismographs logged a magnitude 2.4 earthquake 10km NNW of Anza, CA with origin time 17:22 UTC on October 21, 2021. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-10-21 2021-10-21 16:57:40 UTC	3.1ml	Gulf of Alaska 57.181°, -146.581°	10.0 km	-	-	-	✓ Reviewed	USGS →
On October 21, 2021, worldwide seismic activity registered a magnitude 3.1 earthquake near Gulf of Alaska at 16:57 UTC. See the M3.1 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 October 21, 2021. 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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