Earthquakes on September 21, 2020
274
EARTHQUAKES on September 21, 2020
24-hour UTC period · USGS data
LARGEST: M5.8 — central East Pacific Rise
10 km deep
Normal activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
3
M4.0–4.9
28
M3.0–3.9
12
M2.0–2.9
51
M1.0–1.9
180
Activity Summary
274
Total earthquakes
~250
Daily average
Normal
Activity level
3
M5.0+ events
Significant Earthquakes (M4.5+)
5.8
central East Pacific Rise
13:37 UTC · 10.0 km deep
5.5
21 km NW of Kultuk, Russia
18:04 UTC · 10.0 km deep
Felt by 46
5.5
central East Pacific Rise
12:27 UTC · 10.0 km deep
4.9
Revilla Gigedo Islands region
09:00 UTC · 10.0 km deep
4.7
127 km ENE of ‘Ohonua, Tonga
17:57 UTC · 10.0 km deep
4.7
119 km W of Santa Genoveva de Docordó, Colombia
14:59 UTC · 10.0 km deep
4.7
central East Pacific Rise
12:06 UTC · 10.0 km deep
4.6
15 km WNW of Kultuk, Russia
18:19 UTC · 10.0 km deep
Felt by 4
Earthquake Map — September 21, 2020
All Earthquakes — September 21, 2020
Showing 30 of 94 (filtered from 274)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2020-09-21 2020-09-21 23:51:05 UTC | 2.7md | 9 km S of Guánica, Puerto Rico 17.886°, -66.898° | 13.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.7 earthquake 9 km S of Guánica, Puerto Rico at 23:51 UTC on September 21, 2020. This event falls inside the aftershock decay of a nearby magnitude 3.4 earthquake that occurred about 2 hours earlier. The event was offshore. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-09-21 2020-09-21 23:42:54 UTC | 4.5mb | South Shetland Islands -62.310°, -58.267° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.5 earthquake near South Shetland Islands with origin time 23:42 UTC on September 21, 2020. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-09-21 2020-09-21 23:41:27 UTC | 2.1ml | 4 km W of Lucien, Oklahoma 36.278°, -97.499° | 6.6 km | - | - | - | ✓ Reviewed | USGS → |
At 23:41 UTC on September 21, 2020, a magnitude 2.1 tremor occurred 4 km W of Lucien, Oklahoma. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-09-21 2020-09-21 23:22:31 UTC | 3.1md | 4 km SW of La Parguera, Puerto Rico 17.948°, -67.080° | 11.0 km | - | - | - | ✓ Reviewed | USGS → |
September 21, 2020 brought a magnitude 3.1 earthquake 4 km SW of La Parguera, Puerto Rico, logged at 23:22 UTC. The event was offshore. See the M3.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-09-21 2020-09-21 23:06:12 UTC | 2.1md | 3 km SW of Indios, Puerto Rico 17.967°, -66.839° | 11.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.1 earthquake 3 km SW of Indios, Puerto Rico at 23:06 UTC on September 21, 2020. This event falls inside the aftershock decay of a nearby magnitude 3.4 earthquake that occurred about 1 hours earlier. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-09-21 2020-09-21 22:57:45 UTC | 2.6ml | 152 km SW of Yakutat, Alaska 58.547°, -141.534° | 10.0 km | 1 | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.6 earthquake 152 km SW of Yakutat, Alaska came in on September 21, 2020 at 22:57 UTC. The event was offshore. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-09-21 2020-09-21 22:34:57 UTC | 2.8ml | 191 km S of Atka, Alaska 50.485°, -174.453° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.8 earthquake 191 km S of Atka, Alaska came in on September 21, 2020 at 22:34 UTC. The event was offshore. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-09-21 2020-09-21 22:03:18 UTC | 3.4md | 10 km S of Guánica, Puerto Rico 17.878°, -66.893° | 11.0 km | - | II | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 3.4 earthquake 10 km S of Guánica, Puerto Rico at 22:03 UTC on September 21, 2020. The event was offshore. See the M3.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-09-21 2020-09-21 21:34:07 UTC | 2.0ml | 43 km W of Nanwalek, Alaska 59.291°, -152.675° | 73.2 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.0 earthquake was recorded 43 km W of Nanwalek, Alaska on September 21, 2020 at 21:34 UTC. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-09-21 2020-09-21 21:08:06 UTC | 3.0ml | 111 km SE of Nikolski, Alaska 52.140°, -167.858° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 3.0 earthquake was recorded 111 km SE of Nikolski, Alaska on September 21, 2020 at 21:08 UTC. The event was offshore. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-09-21 2020-09-21 20:48:19 UTC | 4.5mb | South Shetland Islands -62.263°, -58.240° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On September 21, 2020, worldwide seismic activity registered a magnitude 4.5 earthquake near South Shetland Islands at 20:48 UTC. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-09-21 2020-09-21 20:18:47 UTC | 4.1mb | 49 km E of Arica, Chile -18.494°, -69.829° | 103.0 km | 1 | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.1 earthquake 49 km E of Arica, Chile at 20:18 UTC on September 21, 2020. The event was offshore. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-09-21 2020-09-21 20:12:03 UTC | 4.2mb | 194 km SSW of Belaya Gora, Russia 66.837°, 145.129° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.2 earthquake 194 km SSW of Belaya Gora, Russia with origin time 20:12 UTC on September 21, 2020. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-09-21 2020-09-21 20:05:20 UTC | 2.5md | 4 km WSW of Guánica, Puerto Rico 17.959°, -66.947° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
September 21, 2020 brought a magnitude 2.5 earthquake 4 km WSW of Guánica, Puerto Rico, logged at 20:05 UTC. Coming 10 hours after a magnitude 2.9 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-09-21 2020-09-21 19:58:34 UTC | 4.4mb | 21 km W of H?jo, India 26.280°, 91.317° | 39.6 km | 36 | - | - | ✓ Reviewed | USGS → |
A magnitude 4.4 seismic event took place 21 km W of H?jo, India on September 21, 2020 at 19:58 UTC. The event was offshore. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-09-21 2020-09-21 19:55:46 UTC | 2.1ml | 55 km SSE of Adak, Alaska 51.396°, -176.394° | 25.6 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.1 event was detected 55 km SSE of Adak, Alaska on September 21, 2020, with origin time 19:55 UTC. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-09-21 2020-09-21 18:55:31 UTC | 4.1ml | 36 km NE of Larsen Bay, Alaska 57.804°, -153.625° | 51.9 km | - | III | green | ✓ Reviewed | USGS → |
This magnitude 4.1 event was detected 36 km NE of Larsen Bay, Alaska on September 21, 2020, with origin time 18:55 UTC. A tsunami evaluation was automatically initiated given the magnitude and location. The USGS PAGER system assigned a green alert level for this event, signalling no significant casualties or damage expected. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-09-21 2020-09-21 18:55:23 UTC | 2.4ml | 16 km SW of Stanley, Idaho 44.133°, -115.103° | 12.8 km | 1 | - | - | ✓ Reviewed | USGS → |
At 18:55 UTC on September 21, 2020, a magnitude 2.4 tremor occurred 16 km SW of Stanley, Idaho. This event falls inside the aftershock decay of a nearby magnitude 2.7 earthquake that occurred about 17 hours earlier. The event was offshore. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-09-21 2020-09-21 18:40:31 UTC | 2.4ml | 10 km ESE of P?hala, Hawaii 19.179°, -155.386° | 34.2 km | - | - | - | Auto | USGS → |
A magnitude 2.4 seismic event took place 10 km ESE of P?hala, Hawaii on September 21, 2020 at 18:40 UTC. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-09-21 2020-09-21 18:31:58 UTC | 2.8md | 8km NNW of Round Valley, CA 37.474°, -118.643° | 5.8 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.8 earthquake 8km NNW of Round Valley, CA at 18:31 UTC on September 21, 2020. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-09-21 2020-09-21 18:19:55 UTC | 4.6mb | 15 km WNW of Kultuk, Russia 51.790°, 103.494° | 10.0 km | 4 | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.6 earthquake 15 km WNW of Kultuk, Russia came in on September 21, 2020 at 18:19 UTC. This event falls inside the aftershock decay of a nearby magnitude 5.5 earthquake that occurred about 1 hours earlier. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-09-21 2020-09-21 18:19:44 UTC | 2.7md | 2 km WNW of Guayanilla, Puerto Rico 18.029°, -66.811° | 17.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.7 event was detected 2 km WNW of Guayanilla, Puerto Rico on September 21, 2020, with origin time 18:19 UTC. Coming 8 hours after a magnitude 2.9 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-09-21 2020-09-21 18:10:30 UTC | 2.2ml | 26 km S of Eureka Roadhouse, Alaska 61.700°, -147.157° | 28.9 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.2 seismic event took place 26 km S of Eureka Roadhouse, Alaska on September 21, 2020 at 18:10 UTC. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-09-21 2020-09-21 18:04:57 UTC | 5.5mww | 21 km NW of Kultuk, Russia 51.857°, 103.480° | 10.0 km | 46 | VI | green | ✓ Reviewed | USGS → |
A magnitude 5.5 earthquake was recorded 21 km NW of Kultuk, Russia on September 21, 2020 at 18:04 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 M5.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-09-21 2020-09-21 17:57:53 UTC | 2.3ml | 29 km SSE of Mina, Nevada 38.145°, -117.974° | 9.6 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.3 earthquake 29 km SSE of Mina, Nevada with origin time 17:57 UTC on September 21, 2020. It arrived roughly 13 hours after a larger magnitude 3.3 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-09-21 2020-09-21 17:57:38 UTC | 4.7mb | 127 km ENE of ‘Ohonua, Tonga -20.983°, -173.781° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
At 17:57 UTC on September 21, 2020, a magnitude 4.7 tremor occurred 127 km ENE of ‘Ohonua, Tonga. See the M4.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-09-21 2020-09-21 17:55:38 UTC | 2.0ml | 22 km NW of Glacier View, Alaska 61.920°, -148.000° | 35.6 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.0 earthquake 22 km NW of Glacier View, Alaska with origin time 17:55 UTC on September 21, 2020. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-09-21 2020-09-21 16:56:48 UTC | 4.0mb | 15 km SSE of Kocaaliler, Turkey 37.186°, 30.798° | 105.1 km | - | - | - | ✓ Reviewed | USGS → |
September 21, 2020 brought a magnitude 4.0 earthquake 15 km SSE of Kocaaliler, Turkey, logged at 16:56 UTC. See the M4.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-09-21 2020-09-21 15:42:08 UTC | 2.1ml | 12 km E of Happy Valley, Alaska 59.945°, -151.500° | 51.1 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.1 earthquake 12 km E of Happy Valley, Alaska came in on September 21, 2020 at 15:42 UTC. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-09-21 2020-09-21 15:28:36 UTC | 3.1md | 51 km N of Dorado, Puerto Rico 18.923°, -66.225° | 14.0 km | 1 | - | - | ✓ Reviewed | USGS → |
On September 21, 2020 at 15:28 UTC, a magnitude 3.1 earthquake struck 51 km N of Dorado, Puerto Rico. The event was offshore. 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 September 21, 2020. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.