Earthquakes on September 20, 2021
268
EARTHQUAKES on September 20, 2021
24-hour UTC period · USGS data
LARGEST: M6.1 — Kuril Islands
35 km deep · 6 people felt it
Normal activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
6
M4.0–4.9
30
M3.0–3.9
9
M2.0–2.9
63
M1.0–1.9
160
Activity Summary
268
Total earthquakes
~250
Daily average
Normal
Activity level
6
M5.0+ events
Significant Earthquakes (M4.5+)
6.1
Kuril Islands
20:25 UTC · 35.0 km deep
Felt by 6
5.8
80 km ENE of ‘Ohonua, Tonga
18:34 UTC · 14.0 km deep
5.4
South Sandwich Islands region
19:07 UTC · 35.0 km deep
5.3
Kermadec Islands region
18:08 UTC · 410.5 km deep
Felt by 1
5.1
76 km W of Talcahuano, Chile
13:12 UTC · 9.6 km deep
Felt by 4
5.1
Pacific-Antarctic Ridge
03:42 UTC · 10.0 km deep
4.9
105 km ENE of Laikit, Laikit II (Dimembe), Indonesia
23:56 UTC · 56.4 km deep
4.7
northern Mid-Atlantic Ridge
20:49 UTC · 10.0 km deep
Earthquake Map — September 20, 2021
All Earthquakes — September 20, 2021
Showing 30 of 108 (filtered from 268)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2021-09-20 2021-09-20 23:59:40 UTC | 2.4md | 4 km SW of Indios, Puerto Rico 17.961°, -66.848° | 15.0 km | - | - | - | ✓ Reviewed | USGS → |
September 20, 2021 brought a magnitude 2.4 earthquake 4 km SW of Indios, Puerto Rico, logged at 23:59 UTC. It arrived roughly 2 hours after a larger magnitude 3.8 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. | ||||||||
2021-09-20 2021-09-20 23:56:57 UTC | 4.9mb | 105 km ENE of Laikit, Laikit II (Dimembe), Indonesia 1.800°, 125.866° | 56.4 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.9 event was detected 105 km ENE of Laikit, Laikit II (Dimembe), Indonesia on September 20, 2021, with origin time 23:56 UTC. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-20 2021-09-20 23:46:12 UTC | 2.2md | 27km ENE of Dardanelle, CA 38.427°, -119.543° | 5.2 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.2 earthquake 27km ENE of Dardanelle, CA came in on September 20, 2021 at 23:46 UTC. It arrived roughly 1 hours after a larger magnitude 2.8 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. | ||||||||
2021-09-20 2021-09-20 23:45:58 UTC | 2.8md | 25km ENE of Dardanelle, CA 38.416°, -119.559° | 5.7 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.8 earthquake 25km ENE of Dardanelle, CA with origin time 23:45 UTC on September 20, 2021. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-20 2021-09-20 23:44:59 UTC | 3.9md | 152 km NE of Cruz Bay, U.S. Virgin Islands 19.381°, -63.852° | 120.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 3.9 event was detected 152 km NE of Cruz Bay, U.S. Virgin Islands on September 20, 2021, with origin time 23:44 UTC. The event was offshore. See the M3.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-20 2021-09-20 23:40:56 UTC | 2.1ml | 19km SW of La Quinta, CA 33.532°, -116.449° | 9.8 km | 3 | - | - | ✓ Reviewed | USGS → |
This magnitude 2.1 event was detected 19km SW of La Quinta, CA on September 20, 2021, with origin time 23:40 UTC. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-20 2021-09-20 23:39:55 UTC | 2.9ml | 33 km SSW of Playas, New Mexico 31.656°, -108.714° | 19.8 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.9 earthquake 33 km SSW of Playas, New Mexico at 23:39 UTC on September 20, 2021. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-20 2021-09-20 23:18:42 UTC | 2.2ml | 15 km ENE of Hebgen Lake Estates, Montana 44.807°, -110.997° | 7.6 km | - | - | - | ✓ Reviewed | USGS → |
On September 20, 2021, worldwide seismic activity registered a magnitude 2.2 earthquake 15 km ENE of Hebgen Lake Estates, Montana at 23:18 UTC. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-20 2021-09-20 22:54:45 UTC | 2.2ml | 5 km ENE of P?hala, Hawaii 19.228°, -155.431° | 31.5 km | - | - | - | Auto | USGS → |
The USGS recorded this magnitude 2.2 earthquake 5 km ENE of P?hala, Hawaii at 22:54 UTC on September 20, 2021. This event falls inside the aftershock decay of a nearby magnitude 3.6 earthquake that occurred about 1 hours earlier. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-20 2021-09-20 22:49:42 UTC | 3.6ml | 9 km ENE of P?hala, Hawaii 19.244°, -155.396° | 32.0 km | 20 | IV | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 3.6 earthquake 9 km ENE of P?hala, Hawaii with origin time 22:49 UTC on September 20, 2021. See the M3.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-20 2021-09-20 22:41:20 UTC | 2.5ml | 55 km S of Whites City, New Mexico 31.676°, -104.463° | 5.4 km | - | - | - | ✓ Reviewed | USGS → |
At 22:41 UTC on September 20, 2021, a magnitude 2.5 tremor occurred 55 km S of Whites City, New Mexico. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-20 2021-09-20 22:15:26 UTC | 2.3ml | 9 km SW of Mina, Nevada 38.340°, -118.198° | 11.5 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.3 event was detected 9 km SW of Mina, Nevada on September 20, 2021, with origin time 22:15 UTC. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-20 2021-09-20 22:14:06 UTC | 2.5ml | 12 km N of Midland, Texas 32.107°, -102.102° | 9.5 km | 7 | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.5 earthquake 12 km N of Midland, Texas at 22:14 UTC on September 20, 2021. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-20 2021-09-20 22:06:47 UTC | 2.0md | 4 km S of P?hala, Hawaii 19.159°, -155.482° | 31.6 km | - | - | - | Auto | USGS → |
On September 20, 2021 at 22:06 UTC, a magnitude 2.0 earthquake struck 4 km S of P?hala, Hawaii. This event falls inside the aftershock decay of a nearby magnitude 2.9 earthquake that occurred about 1 hours earlier. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-20 2021-09-20 21:58:25 UTC | 3.8md | 4 km SW of Indios, Puerto Rico 17.965°, -66.849° | 11.0 km | 20 | III | - | ✓ Reviewed | USGS → |
On September 20, 2021 at 21:58 UTC, a magnitude 3.8 earthquake struck 4 km SW of Indios, Puerto Rico. The event was offshore. See the M3.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-20 2021-09-20 21:53:52 UTC | 4.3mb | 254 km ESE of Attu Station, Alaska 51.716°, 176.433° | 41.5 km | - | - | - | ✓ Reviewed | USGS → |
On September 20, 2021, worldwide seismic activity registered a magnitude 4.3 earthquake 254 km ESE of Attu Station, Alaska at 21:53 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-20 2021-09-20 21:46:44 UTC | 2.9ml | 2 km SSW of P?hala, Hawaii 19.183°, -155.488° | 34.9 km | 1 | - | - | ✓ Reviewed | USGS → |
A magnitude 2.9 seismic event took place 2 km SSW of P?hala, Hawaii on September 20, 2021 at 21:46 UTC. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-20 2021-09-20 21:18:13 UTC | 2.1ml | 12 km SSE of Volcano, Hawaii 19.336°, -155.191° | 5.1 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.1 earthquake 12 km SSE of Volcano, Hawaii came in on September 20, 2021 at 21:18 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.1 earthquake that occurred about 19 hours earlier. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-20 2021-09-20 20:49:19 UTC | 4.3mb | 115 km NW of San Antonio de los Cobres, Argentina -23.454°, -67.093° | 212.4 km | - | - | - | ✓ Reviewed | USGS → |
At 20:49 UTC on September 20, 2021, a magnitude 4.3 tremor occurred 115 km NW of San Antonio de los Cobres, Argentina. The event was offshore. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-20 2021-09-20 20:49:09 UTC | 4.7mb | northern Mid-Atlantic Ridge 50.921°, -29.874° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.7 earthquake near northern Mid-Atlantic Ridge came in on September 20, 2021 at 20:49 UTC. See the M4.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-20 2021-09-20 20:48:07 UTC | 2.4md | 4 km SW of P?hala, Hawaii 19.168°, -155.506° | 35.8 km | - | - | - | Auto | USGS → |
On September 20, 2021, worldwide seismic activity registered a magnitude 2.4 earthquake 4 km SW of P?hala, Hawaii at 20:48 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.4 earthquake that occurred about 15 hours earlier. The event was offshore. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-20 2021-09-20 20:25:26 UTC | 6.1mww | Kuril Islands 46.393°, 152.488° | 35.0 km | 6 | IV | green | ✓ Reviewed | USGS → |
On September 20, 2021 at 20:25 UTC, a magnitude 6.1 earthquake struck near Kuril Islands. The USGS PAGER system assigned a green alert level for this event, signalling no significant casualties or damage expected. It is the largest earthquake currently listed for worldwide seismic activity on September 20, 2021. See the M6.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-20 2021-09-20 19:52:06 UTC | 2.3ml | 59 km WNW of Ninilchik, Alaska 60.177°, -152.704° | 112.2 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.3 earthquake 59 km WNW of Ninilchik, Alaska came in on September 20, 2021 at 19:52 UTC. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-20 2021-09-20 19:50:48 UTC | 4.6mb | South Sandwich Islands region -59.681°, -26.243° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.6 earthquake in the South Sandwich Islands region with origin time 19:50 UTC on September 20, 2021. It arrived roughly 12 hours after a larger magnitude 4.7 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-20 2021-09-20 19:30:34 UTC | 2.0ml | 38 km E of Pedro Bay, Alaska 59.840°, -153.423° | 128.3 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.0 earthquake was recorded 38 km E of Pedro Bay, Alaska on September 20, 2021 at 19:30 UTC. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-20 2021-09-20 19:14:05 UTC | 2.9ml | 7 km SE of Wright, Wyoming 43.710°, -105.412° | 0.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.9 event was detected 7 km SE of Wright, Wyoming on September 20, 2021, with origin time 19:14 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-20 2021-09-20 19:12:11 UTC | 2.7ml | 77 km SE of Atka, Alaska 51.778°, -173.289° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.7 earthquake 77 km SE of Atka, Alaska at 19:12 UTC on September 20, 2021. The event was offshore. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-20 2021-09-20 19:07:45 UTC | 5.4mb | South Sandwich Islands region -59.788°, -26.593° | 35.0 km | - | III | green | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 5.4 earthquake in the South Sandwich Islands region with origin time 19:07 UTC on September 20, 2021. The USGS PAGER system assigned a green alert level for this event, signalling no significant casualties or damage expected. See the M5.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-20 2021-09-20 18:54:55 UTC | 2.9ml | 70 km NE of Adak, Alaska 52.389°, -176.044° | 227.6 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.9 earthquake 70 km NE of Adak, Alaska came in on September 20, 2021 at 18:54 UTC. The event was offshore. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-20 2021-09-20 18:41:28 UTC | 2.2md | 4 km SE of P?hala, Hawaii 19.180°, -155.448° | 32.0 km | - | - | - | Auto | USGS → |
A magnitude 2.2 seismic event took place 4 km SE of P?hala, Hawaii on September 20, 2021 at 18:41 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.4 earthquake that occurred about 13 hours earlier. The event was offshore. See the M2.2 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 20, 2021. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.