Earthquakes on October 20, 2021
277
EARTHQUAKES on October 20, 2021
24-hour UTC period · USGS data
211 km deep · 1 person felt it
Normal activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
2
M4.0–4.9
20
M3.0–3.9
9
M2.0–2.9
61
M1.0–1.9
185
Activity Summary
277
Total earthquakes
~250
Daily average
Normal
Activity level
2
M5.0+ events
Geographic Breakdown
By US State
Top Countries (International)
South Sandwich Islands
2
Significant Earthquakes (M4.5+)
5.2
172 km SE of Lata, Solomon Islands
06:38 UTC · 210.7 km deep
Felt by 1
5.0
152 km WNW of Abepura, Indonesia
06:10 UTC · 10.0 km deep
4.9
South Sandwich Islands region
19:37 UTC · 35.0 km deep
4.8
30 km NNE of Labuan Lombok, Indonesia
09:21 UTC · 10.0 km deep
Felt by 1
4.8
1 km N of Alkhan-Yurt, Russia
04:45 UTC · 10.0 km deep
Felt by 3
4.8
Mariana Islands region
03:28 UTC · 81.1 km deep
4.8
South Sandwich Islands region
01:02 UTC · 10.0 km deep
4.6
40 km SSE of Kirakira, Solomon Islands
05:47 UTC · 74.1 km deep
Earthquake Map — October 20, 2021
All Earthquakes — October 20, 2021
Showing 30 of 92 (filtered from 277)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2021-10-20 2021-10-20 23:39:43 UTC | 2.0ml | 11km E of Ridgecrest, CA 35.635°, -117.557° | 3.7 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.0 earthquake 11km E of Ridgecrest, CA with origin time 23:39 UTC on October 20, 2021. 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. | ||||||||
2021-10-20 2021-10-20 23:36:27 UTC | 2.4md | 1 km NE of P?hala, Hawaii 19.211°, -155.472° | 33.9 km | - | - | - | Auto | USGS → |
A magnitude 2.4 earthquake was recorded 1 km NE of P?hala, Hawaii on October 20, 2021 at 23:36 UTC. It arrived roughly 17 hours after a larger magnitude 2.4 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-20 2021-10-20 23:34:08 UTC | 4.3mb | Greenland Sea 79.546°, 1.702° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.3 earthquake was recorded near Greenland Sea on October 20, 2021 at 23:34 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-20 2021-10-20 23:27:35 UTC | 4.1mb | 202 km ENE of Gisborne, New Zealand -37.847°, -179.925° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.1 seismic event took place 202 km ENE of Gisborne, New Zealand on October 20, 2021 at 23:27 UTC. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-20 2021-10-20 23:26:48 UTC | 2.1md | 21 km SSE of Naalehu, Hawaii 18.877°, -155.524° | 35.9 km | - | - | - | ✓ Reviewed | USGS → |
On October 20, 2021, worldwide seismic activity registered a magnitude 2.1 earthquake 21 km SSE of Naalehu, Hawaii at 23:26 UTC. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-20 2021-10-20 23:08:35 UTC | 2.2md | 5 km NW of P?hala, Hawaii 19.235°, -155.522° | 4.0 km | - | - | - | Auto | USGS → |
On October 20, 2021 at 23:08 UTC, a magnitude 2.2 earthquake struck 5 km NW of P?hala, Hawaii. This event falls inside the aftershock decay of a nearby magnitude 2.4 earthquake that occurred about 16 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. | ||||||||
2021-10-20 2021-10-20 22:58:23 UTC | 2.3ml | 114 km W of Akhiok, Alaska 56.765°, -156.026° | 76.8 km | - | - | - | ✓ Reviewed | USGS → |
On October 20, 2021, worldwide seismic activity registered a magnitude 2.3 earthquake 114 km W of Akhiok, Alaska at 22:58 UTC. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-20 2021-10-20 22:21:21 UTC | 2.2ml | 23 km SE of Fox River, Alaska 59.714°, -150.643° | 31.2 km | - | - | - | ✓ Reviewed | USGS → |
On October 20, 2021, worldwide seismic activity registered a magnitude 2.2 earthquake 23 km SE of Fox River, Alaska at 22:21 UTC. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-20 2021-10-20 22:05:58 UTC | 2.6ml | 35 km SSE of Chignik, Alaska 56.013°, -158.129° | 87.1 km | - | - | - | ✓ Reviewed | USGS → |
October 20, 2021 brought a magnitude 2.6 earthquake 35 km SSE of Chignik, Alaska, logged at 22:05 UTC. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-20 2021-10-20 22:03:38 UTC | 2.2ml | 15 km SW of Hiko, Nevada 37.500°, -115.343° | 2.6 km | - | - | - | ✓ Reviewed | USGS → |
At 22:03 UTC on October 20, 2021, a magnitude 2.2 tremor occurred 15 km SW of Hiko, Nevada. 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. | ||||||||
2021-10-20 2021-10-20 21:48:46 UTC | 4.3mb | 15 km WSW of Claveria, Philippines 18.556°, 120.947° | 42.4 km | 3 | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.3 earthquake 15 km WSW of Claveria, Philippines with origin time 21:48 UTC on October 20, 2021. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-20 2021-10-20 21:29:40 UTC | 2.1md | 11 km ESE of P?hala, Hawaii 19.155°, -155.379° | 30.1 km | - | - | - | Auto | USGS → |
At 21:29 UTC on October 20, 2021, a magnitude 2.1 tremor occurred 11 km ESE of P?hala, Hawaii. Coming 15 hours after a magnitude 2.4 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. | ||||||||
2021-10-20 2021-10-20 21:05:01 UTC | 2.1md | 3 km S of P?hala, Hawaii 19.173°, -155.476° | 34.3 km | - | - | - | Auto | USGS → |
A magnitude 2.1 earthquake was recorded 3 km S of P?hala, Hawaii on October 20, 2021 at 21:05 UTC. Coming 14 hours after a magnitude 2.4 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-20 2021-10-20 20:08:40 UTC | 2.5ml | 65 km ESE of Egegik, Alaska 57.900°, -156.444° | 136.6 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.5 earthquake 65 km ESE of Egegik, Alaska with origin time 20:08 UTC on October 20, 2021. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-20 2021-10-20 19:37:45 UTC | 3.6md | 24 km SE of Boca de Yuma, Dominican Republic 18.212°, -68.457° | 66.0 km | - | - | - | ✓ Reviewed | USGS → |
On October 20, 2021, worldwide seismic activity registered a magnitude 3.6 earthquake 24 km SE of Boca de Yuma, Dominican Republic at 19:37 UTC. The event was offshore. See the M3.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-20 2021-10-20 19:37:07 UTC | 4.9mb | South Sandwich Islands region -57.800°, -25.368° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.9 earthquake in the South Sandwich Islands region with origin time 19:37 UTC on October 20, 2021. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-20 2021-10-20 19:28:27 UTC | 2.8ml | 42 km NW of Stevens Village, Alaska 66.247°, -149.822° | 14.8 km | - | - | - | ✓ Reviewed | USGS → |
At 19:28 UTC on October 20, 2021, a magnitude 2.8 tremor occurred 42 km NW of Stevens Village, Alaska. The event was offshore. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-20 2021-10-20 19:27:05 UTC | 2.6ml | 56km W of Ferndale, CA 40.594°, -124.926° | 24.6 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.6 seismic event took place 56km W of Ferndale, CA on October 20, 2021 at 19:27 UTC. The event was offshore. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-20 2021-10-20 19:24:20 UTC | 2.0md | 3 km SSE of P?hala, Hawaii 19.172°, -155.464° | 34.4 km | - | - | - | Auto | USGS → |
The USGS recorded this magnitude 2.0 earthquake 3 km SSE of P?hala, Hawaii at 19:24 UTC on October 20, 2021. This event falls inside the aftershock decay of a nearby magnitude 2.4 earthquake that occurred about 13 hours earlier. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-20 2021-10-20 18:53:17 UTC | 4.5mb | 101 km S of Pelabuhanratu, Indonesia -7.901°, 106.455° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.5 seismic event took place 101 km S of Pelabuhanratu, Indonesia on October 20, 2021 at 18:53 UTC. The event was offshore. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-20 2021-10-20 18:41:32 UTC | 2.2md | 4 km SSW of P?hala, Hawaii 19.172°, -155.500° | 35.7 km | - | - | - | Auto | USGS → |
October 20, 2021 brought a magnitude 2.2 earthquake 4 km SSW of P?hala, Hawaii, logged at 18:41 UTC. It arrived roughly 12 hours after a larger magnitude 2.4 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-20 2021-10-20 17:49:48 UTC | 3.6ml | 93 km ESE of Adak, Alaska 51.666°, -175.315° | 23.5 km | - | - | - | ✓ Reviewed | USGS → |
At 17:49 UTC on October 20, 2021, a magnitude 3.6 tremor occurred 93 km ESE of Adak, Alaska. See the M3.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-20 2021-10-20 17:10:38 UTC | 3.0ml | 50 km ESE of Adak, Alaska 51.729°, -175.936° | 3.1 km | 1 | - | - | ✓ Reviewed | USGS → |
October 20, 2021 brought a magnitude 3.0 earthquake 50 km ESE of Adak, Alaska, logged at 17:10 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. | ||||||||
2021-10-20 2021-10-20 17:10:37 UTC | 4.1mb | 147 km NNE of Adak, Alaska 53.142°, -176.023° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
October 20, 2021 brought a magnitude 4.1 earthquake 147 km NNE of Adak, Alaska, logged at 17:10 UTC. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-20 2021-10-20 17:00:51 UTC | 3.6ml | 86 km ENE of Nikolski, Alaska 53.228°, -167.658° | 76.4 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 3.6 earthquake 86 km ENE of Nikolski, Alaska at 17:00 UTC on October 20, 2021. See the M3.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-20 2021-10-20 16:32:34 UTC | 2.3ml | 87 km N of Yakutat, Alaska 60.325°, -139.970° | 2.9 km | - | - | - | ✓ Reviewed | USGS → |
At 16:32 UTC on October 20, 2021, a magnitude 2.3 tremor occurred 87 km N of Yakutat, Alaska. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-20 2021-10-20 16:31:25 UTC | 2.0ml | 64 km SE of Kokhanok, Alaska 59.009°, -154.010° | 102.4 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.0 event was detected 64 km SE of Kokhanok, Alaska on October 20, 2021, with origin time 16:31 UTC. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-20 2021-10-20 16:20:20 UTC | 2.3ml | 61 km WNW of Nanwalek, Alaska 59.560°, -152.926° | 87.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.3 earthquake 61 km WNW of Nanwalek, Alaska at 16:20 UTC on October 20, 2021. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-20 2021-10-20 16:16:54 UTC | 2.1ml | 50 km SSW of Whites City, New Mexico 31.759°, -104.592° | 4.6 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.1 earthquake 50 km SSW of Whites City, New Mexico at 16:16 UTC on October 20, 2021. It arrived roughly 15 hours after a larger magnitude 2.4 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 M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-20 2021-10-20 15:05:47 UTC | 4.4mb | 12 km NNW of Van, Turkey 38.608°, 43.351° | 10.0 km | 2 | - | - | ✓ Reviewed | USGS → |
October 20, 2021 brought a magnitude 4.4 earthquake 12 km NNW of Van, Turkey, logged at 15:05 UTC. See the M4.4 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 20, 2021. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.