Time ↓	Mag ↕	Location ↕	Depth ↕	Felt ↕	MMI	Alert	Status	Details
2021-08-18 2021-08-18 23:47:17 UTC	2.0ml	1 km E of Quinton, Oklahoma 35.123°, -95.353°	5.1 km	-	-	-	✓ Reviewed	USGS →
On August 18, 2021 at 23:47 UTC, a magnitude 2.0 earthquake struck 1 km E of Quinton, Oklahoma. Coming 18 hours after a magnitude 2.1 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-08-18 2021-08-18 23:37:59 UTC	4.2mb	Banda Sea -6.436°, 130.162°	112.1 km	-	-	-	✓ Reviewed	USGS →
This magnitude 4.2 event was detected near Banda Sea on August 18, 2021, with origin time 23:37 UTC. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-08-18 2021-08-18 23:30:33 UTC	5.2mb	South Sandwich Islands region -58.698°, -23.299°	10.0 km	-	-	-	✓ Reviewed	USGS →
At 23:30 UTC on August 18, 2021, a magnitude 5.2 tremor occurred in the South Sandwich Islands region. See the M5.2 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-08-18 2021-08-18 23:27:18 UTC	2.0md	8 km E of P?hala, Hawaii 19.198°, -155.398°	30.9 km	-	-	-	Auto	USGS →
August 18, 2021 brought a magnitude 2.0 earthquake 8 km E of P?hala, Hawaii, logged at 23:27 UTC. This event falls inside the aftershock decay of a nearby magnitude 4.1 earthquake that occurred about 11 hours earlier. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-08-18 2021-08-18 23:22:32 UTC	4.3mb	103 km ENE of Amahai, Indonesia -3.129°, 129.825°	10.0 km	-	-	-	✓ Reviewed	USGS →
On August 18, 2021, worldwide seismic activity registered a magnitude 4.3 earthquake 103 km ENE of Amahai, Indonesia at 23:22 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-08-18 2021-08-18 23:16:47 UTC	4.5mb	South Sandwich Islands region -56.377°, -26.485°	35.0 km	-	-	-	✓ Reviewed	USGS →
Seismographs logged a magnitude 4.5 earthquake in the South Sandwich Islands region with origin time 23:16 UTC on August 18, 2021. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-08-18 2021-08-18 22:40:26 UTC	2.5ml	18km ESE of Ocotillo Wells, CA 33.065°, -115.965°	3.2 km	-	-	-	✓ Reviewed	USGS →
A magnitude 2.5 earthquake was recorded 18km ESE of Ocotillo Wells, CA on August 18, 2021 at 22:40 UTC. This event falls inside the aftershock decay of a nearby magnitude 4.0 earthquake that occurred about 1 hours earlier. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-08-18 2021-08-18 22:26:13 UTC	3.6mb	141 km WSW of Adak, Alaska 51.286°, -178.441°	31.1 km	-	II	-	✓ Reviewed	USGS →
A magnitude 3.6 seismic event took place 141 km WSW of Adak, Alaska on August 18, 2021 at 22:26 UTC. See the M3.6 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-08-18 2021-08-18 22:24:59 UTC	2.0ml	18km ESE of Ocotillo Wells, CA 33.072°, -115.955°	4.2 km	-	-	-	✓ Reviewed	USGS →
Seismographs logged a magnitude 2.0 earthquake 18km ESE of Ocotillo Wells, CA with origin time 22:24 UTC on August 18, 2021. This event falls inside the aftershock decay of a nearby magnitude 4.0 earthquake that occurred about 1 hours earlier. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-08-18 2021-08-18 22:16:20 UTC	2.0ml	93 km SSE of Sand Point, AK 54.537°, -160.061°	25.6 km	-	-	-	✓ Reviewed	USGS →
On August 18, 2021, worldwide seismic activity registered a magnitude 2.0 earthquake 93 km SSE of Sand Point, AK at 22:16 UTC. Coming 5 hours after a magnitude 2.8 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-08-18 2021-08-18 22:16:00 UTC	2.2ml	37 km SE of Mina, Nevada 38.183°, -117.772°	11.2 km	-	-	-	✓ Reviewed	USGS →
On August 18, 2021, worldwide seismic activity registered a magnitude 2.2 earthquake 37 km SE of Mina, Nevada at 22:16 UTC. Coming 16 hours after a magnitude 2.6 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-08-18 2021-08-18 22:14:29 UTC	4.4mb	171 km SSW of Severo-Kuril’sk, Russia 49.326°, 154.956°	93.2 km	-	-	-	✓ Reviewed	USGS →
On August 18, 2021, worldwide seismic activity registered a magnitude 4.4 earthquake 171 km SSW of Severo-Kuril’sk, Russia at 22:14 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-08-18 2021-08-18 22:13:54 UTC	5.3mb	South Sandwich Islands region -57.441°, -25.204°	24.5 km	-	-	-	✓ Reviewed	USGS →
On August 18, 2021, worldwide seismic activity registered a magnitude 5.3 earthquake in the South Sandwich Islands region at 22:13 UTC. See the M5.3 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-08-18 2021-08-18 22:13:16 UTC	4.3mb	South Sandwich Islands region -58.455°, -23.625°	10.0 km	-	-	-	✓ Reviewed	USGS →
At 22:13 UTC on August 18, 2021, a magnitude 4.3 tremor occurred in the South Sandwich Islands region. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-08-18 2021-08-18 21:53:27 UTC	2.4ml	18km ESE of Ocotillo Wells, CA 33.071°, -115.956°	1.9 km	-	-	-	✓ Reviewed	USGS →
August 18, 2021 brought a magnitude 2.4 earthquake 18km ESE of Ocotillo Wells, CA, logged at 21:53 UTC. It arrived roughly 1 hours after a larger magnitude 4.0 mainshock in the same 20 km area, placing it within the typical aftershock window. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-08-18 2021-08-18 21:50:59 UTC	2.4ml	33 km SSE of Funny River, Alaska 60.208°, -150.623°	10.5 km	-	-	-	✓ Reviewed	USGS →
This magnitude 2.4 event was detected 33 km SSE of Funny River, Alaska on August 18, 2021, with origin time 21:50 UTC. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-08-18 2021-08-18 21:50:22 UTC	3.8mw	17km ESE of Ocotillo Wells, CA 33.075°, -115.968°	3.8 km	7	IV	-	✓ Reviewed	USGS →
This magnitude 3.8 event was detected 17km ESE of Ocotillo Wells, CA on August 18, 2021, with origin time 21:50 UTC. It arrived roughly 1 hours after a larger magnitude 4.0 mainshock in the same 20 km area, placing it within the typical aftershock window. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M3.8 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-08-18 2021-08-18 21:49:55 UTC	6.0mww	South Sandwich Islands region -59.634°, -26.348°	28.0 km	-	IV	green	✓ Reviewed	USGS →
A magnitude 6.0 earthquake was recorded in the South Sandwich Islands region on August 18, 2021 at 21:49 UTC. The USGS PAGER system assigned a green alert level for this event, signalling no significant casualties or damage expected. See the M6.0 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-08-18 2021-08-18 21:46:14 UTC	2.1ml	7 km ENE of P?hala, Hawaii 19.217°, -155.412°	31.4 km	1	-	-	Auto	USGS →
Seismographs logged a magnitude 2.1 earthquake 7 km ENE of P?hala, Hawaii with origin time 21:46 UTC on August 18, 2021. Coming 10 hours after a magnitude 4.1 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-08-18 2021-08-18 21:45:14 UTC	4.0mw	18km ESE of Ocotillo Wells, CA 33.073°, -115.960°	7.1 km	46	IV	-	✓ Reviewed	USGS →
The USGS recorded this magnitude 4.0 earthquake 18km ESE of Ocotillo Wells, CA at 21:45 UTC on August 18, 2021. In the 72 hours after this event, the USGS recorded 6 smaller earthquakes within 20 km, consistent with an ongoing aftershock sequence rooted here. See the M4.0 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-08-18 2021-08-18 21:40:52 UTC	5.0mb	South Sandwich Islands region -56.481°, -25.175°	16.4 km	-	-	-	✓ Reviewed	USGS →
A magnitude 5.0 earthquake was recorded in the South Sandwich Islands region on August 18, 2021 at 21:40 UTC. See the M5.0 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-08-18 2021-08-18 21:39:57 UTC	2.6ml	61 km SE of Perryville, Alaska 55.535°, -158.424°	10.0 km	-	-	-	✓ Reviewed	USGS →
At 21:39 UTC on August 18, 2021, a magnitude 2.6 tremor occurred 61 km SE of Perryville, Alaska. The event was offshore. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-08-18 2021-08-18 21:36:45 UTC	2.0ml	18km ESE of Ocotillo Wells, CA 33.077°, -115.952°	4.7 km	-	-	-	✓ Reviewed	USGS →
A magnitude 2.0 seismic event took place 18km ESE of Ocotillo Wells, CA on August 18, 2021 at 21:36 UTC. It arrived roughly 4 hours after a larger magnitude 2.8 mainshock in the same 20 km area, placing it within the typical aftershock window. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-08-18 2021-08-18 21:35:38 UTC	2.2ml	19km ESE of Ocotillo Wells, CA 33.075°, -115.948°	3.4 km	-	-	-	✓ Reviewed	USGS →
Seismographs logged a magnitude 2.2 earthquake 19km ESE of Ocotillo Wells, CA with origin time 21:35 UTC on August 18, 2021. This event falls inside the aftershock decay of a nearby magnitude 2.8 earthquake that occurred about 4 hours earlier. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-08-18 2021-08-18 21:22:47 UTC	2.4ml	4 km SSW of Volcano, Hawaii 19.401°, -155.248°	-0.3 km	2	-	-	Auto	USGS →
A magnitude 2.4 earthquake was recorded 4 km SSW of Volcano, Hawaii on August 18, 2021 at 21:22 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-08-18 2021-08-18 21:21:54 UTC	2.5ml	63 km NE of Chignik, Alaska 56.639°, -157.583°	75.2 km	-	-	-	✓ Reviewed	USGS →
Seismographs logged a magnitude 2.5 earthquake 63 km NE of Chignik, Alaska with origin time 21:21 UTC on August 18, 2021. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-08-18 2021-08-18 21:09:17 UTC	2.3md	10 km N of Dyersburg, Tennessee 36.133°, -89.394°	8.7 km	1	-	-	✓ Reviewed	USGS →
August 18, 2021 brought a magnitude 2.3 earthquake 10 km N of Dyersburg, Tennessee, logged at 21:09 UTC. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-08-18 2021-08-18 21:07:32 UTC	2.1ml	6 km E of P?hala, Hawaii 19.215°, -155.413°	29.3 km	-	-	-	Auto	USGS →
A magnitude 2.1 earthquake was recorded 6 km E of P?hala, Hawaii on August 18, 2021 at 21:07 UTC. This event falls inside the aftershock decay of a nearby magnitude 4.1 earthquake that occurred about 9 hours earlier. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-08-18 2021-08-18 21:02:29 UTC	5.2mb	South Sandwich Islands region -58.474°, -23.270°	10.0 km	-	-	-	✓ Reviewed	USGS →
The USGS recorded this magnitude 5.2 earthquake in the South Sandwich Islands region at 21:02 UTC on August 18, 2021. See the M5.2 event page for the full report, ShakeMap, and citizen-reported intensity data.
2021-08-18 2021-08-18 20:59:44 UTC	4.7mb	South Sandwich Islands region -58.507°, -23.166°	10.0 km	-	-	-	✓ Reviewed	USGS →
At 20:59 UTC on August 18, 2021, a magnitude 4.7 tremor occurred in the South Sandwich Islands region. See the M4.7 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 August 18, 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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