Earthquakes on September 23, 2021
289
EARTHQUAKES on September 23, 2021
24-hour UTC period · USGS data
10 km deep · 10 people felt it
Normal activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
2
M4.0–4.9
45
M3.0–3.9
15
M2.0–2.9
55
M1.0–1.9
172
Activity Summary
289
Total earthquakes
~250
Daily average
Normal
Activity level
2
M5.0+ events
Geographic Breakdown
By US State
Top Countries (International)
Significant Earthquakes (M4.5+)
5.7
140 km SW of Empaque Tarriba, Mexico
16:47 UTC · 10.0 km deep
Felt by 10
5.2
143 km SW of Empaque Tarriba, Mexico
16:47 UTC · 10.0 km deep
4.9
87 km SSE of Panguna, Papua New Guinea
18:59 UTC · 97.3 km deep
4.9
South Sandwich Islands region
16:02 UTC · 45.4 km deep
4.9
127 km WNW of Hovd, Mongolia
00:03 UTC · 10.0 km deep
Felt by 1
4.8
75 km SW of Jiquilillo, Nicaragua
22:17 UTC · 36.5 km deep
4.8
174 km NE of Neiafu, Tonga
18:32 UTC · 10.0 km deep
4.8
61 km SW of Novaya Chara, Russia
17:05 UTC · 10.0 km deep
Earthquake Map — September 23, 2021
All Earthquakes — September 23, 2021
Showing 30 of 117 (filtered from 289)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2021-09-23 2021-09-23 23:46:31 UTC | 2.0ml | 133 km W of Adak, Alaska 52.017°, -178.556° | 132.1 km | - | - | - | ✓ Reviewed | USGS → |
On September 23, 2021, worldwide seismic activity registered a magnitude 2.0 earthquake 133 km W of Adak, Alaska at 23:46 UTC. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-23 2021-09-23 23:37:23 UTC | 4.7mb | Kermadec Islands, New Zealand -29.823°, -177.003° | 10.0 km | 1 | - | - | ✓ Reviewed | USGS → |
A magnitude 4.7 seismic event took place near Kermadec Islands, New Zealand on September 23, 2021 at 23:37 UTC. See the M4.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-23 2021-09-23 23:31:44 UTC | 4.3mb | Kermadec Islands region -28.368°, -177.620° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.3 earthquake in the Kermadec Islands region at 23:31 UTC on September 23, 2021. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-23 2021-09-23 23:20:26 UTC | 3.2ml | 54 km S of Whites City, New Mexico 31.684°, -104.379° | 6.4 km | 1 | - | - | ✓ Reviewed | USGS → |
September 23, 2021 brought a magnitude 3.2 earthquake 54 km S of Whites City, New Mexico, logged at 23:20 UTC. The event was offshore. See the M3.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-23 2021-09-23 23:14:51 UTC | 2.4md | 4 km ESE of Indios, Puerto Rico 17.974°, -66.785° | 17.0 km | - | - | - | ✓ Reviewed | USGS → |
September 23, 2021 brought a magnitude 2.4 earthquake 4 km ESE of Indios, Puerto Rico, logged at 23:14 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.6 earthquake that occurred about 5 hours earlier. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-23 2021-09-23 22:58:45 UTC | 4.3mb | Fiji region -21.394°, -178.254° | 555.4 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.3 event was detected in the Fiji region on September 23, 2021, with origin time 22:58 UTC. This deep-focus earthquake originated far below the brittle crust, deep inside the mantle. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-23 2021-09-23 22:51:39 UTC | 2.4md | 24 km SE of Waimea, Hawaii 19.845°, -155.528° | 24.6 km | 1 | - | - | ✓ Reviewed | USGS → |
On September 23, 2021 at 22:51 UTC, a magnitude 2.4 earthquake struck 24 km SE of Waimea, Hawaii. The event was offshore. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-23 2021-09-23 22:41:10 UTC | 4.4mwr | 39 km ESE of Nikolski, Alaska 52.751°, -168.364° | 39.2 km | - | - | - | ✓ Reviewed | USGS → |
On September 23, 2021, worldwide seismic activity registered a magnitude 4.4 earthquake 39 km ESE of Nikolski, Alaska at 22:41 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-23 2021-09-23 22:24:46 UTC | 4.4mb | 258 km WNW of Haveluloto, Tonga -20.538°, -177.611° | 527.2 km | - | - | - | ✓ Reviewed | USGS → |
At 22:24 UTC on September 23, 2021, a magnitude 4.4 tremor occurred 258 km WNW of Haveluloto, Tonga. This deep-focus earthquake originated far below the brittle crust, deep inside the mantle. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-23 2021-09-23 22:17:45 UTC | 4.8mwr | 75 km SW of Jiquilillo, Nicaragua 12.181°, -87.839° | 36.5 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.8 earthquake 75 km SW of Jiquilillo, Nicaragua at 22:17 UTC on September 23, 2021. The event was offshore. See the M4.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-23 2021-09-23 21:55:57 UTC | 2.2ml | 86 km SSE of King Cove, Alaska 54.398°, -161.621° | 25.5 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.2 earthquake was recorded 86 km SSE of King Cove, Alaska on September 23, 2021 at 21:55 UTC. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-23 2021-09-23 21:34:37 UTC | 2.5ml | 35 km SE of Mina, Nevada 38.176°, -117.800° | 7.2 km | 1 | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.5 earthquake 35 km SE of Mina, Nevada with origin time 21:34 UTC on September 23, 2021. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-23 2021-09-23 20:47:34 UTC | 4.5mb | Falkland Islands region -54.421°, -56.988° | 10.0 km | 1 | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.5 earthquake in the Falkland Islands region at 20:47 UTC on September 23, 2021. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-23 2021-09-23 20:45:25 UTC | 2.8ml | 56 km NW of Toyah, Texas 31.654°, -104.235° | 7.3 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.8 event was detected 56 km NW of Toyah, Texas on September 23, 2021, with origin time 20:45 UTC. The event was offshore. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-23 2021-09-23 20:24:54 UTC | 2.1md | 6km SW of Laytonville, CA 39.647°, -123.523° | 3.1 km | - | - | - | ✓ Reviewed | USGS → |
September 23, 2021 brought a magnitude 2.1 earthquake 6km SW of Laytonville, CA, logged at 20:24 UTC. 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. | ||||||||
2021-09-23 2021-09-23 20:13:18 UTC | 3.2ml | 7 km WSW of Colstrip, Montana 45.847°, -106.711° | 0.0 km | - | - | - | ✓ Reviewed | USGS → |
On September 23, 2021 at 20:13 UTC, a magnitude 3.2 earthquake struck 7 km WSW of Colstrip, Montana. 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. | ||||||||
2021-09-23 2021-09-23 20:08:34 UTC | 4.6mb | 57 km SSE of Xunchang, China 28.009°, 105.023° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On September 23, 2021 at 20:08 UTC, a magnitude 4.6 earthquake struck 57 km SSE of Xunchang, China. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-23 2021-09-23 20:00:25 UTC | 4.2mb | near the coast of Nicaragua 12.340°, -87.661° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.2 earthquake was recorded near near the coast of Nicaragua on September 23, 2021 at 20:00 UTC. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-23 2021-09-23 19:48:30 UTC | 4.5mb | Laccadive Sea 5.591°, 78.943° | 10.0 km | 3 | - | - | ✓ Reviewed | USGS → |
This magnitude 4.5 event was detected near Laccadive Sea on September 23, 2021, with origin time 19:48 UTC. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-23 2021-09-23 19:43:24 UTC | 2.1md | 2 km SSW of P?hala, Hawaii 19.185°, -155.489° | 31.0 km | - | - | - | Auto | USGS → |
A magnitude 2.1 seismic event took place 2 km SSW of P?hala, Hawaii on September 23, 2021 at 19:43 UTC. It arrived roughly 3 hours after a larger magnitude 2.3 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-23 2021-09-23 19:18:33 UTC | 3.6md | 147 km NNE of Vieques, Puerto Rico 19.666°, -65.316° | 40.0 km | - | - | - | ✓ Reviewed | USGS → |
On September 23, 2021, worldwide seismic activity registered a magnitude 3.6 earthquake 147 km NNE of Vieques, Puerto Rico at 19:18 UTC. See the M3.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-23 2021-09-23 19:00:38 UTC | 2.3ml | 26 km NW of Anchor Point, Alaska 59.919°, -152.221° | 85.4 km | 1 | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.3 earthquake 26 km NW of Anchor Point, Alaska at 19:00 UTC on September 23, 2021. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-23 2021-09-23 18:59:38 UTC | 4.9mb | 87 km SSE of Panguna, Papua New Guinea -7.052°, 155.786° | 97.3 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.9 earthquake 87 km SSE of Panguna, Papua New Guinea with origin time 18:59 UTC on September 23, 2021. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-23 2021-09-23 18:57:49 UTC | 2.2ml | 7km SW of Holtville, CA 32.761°, -115.433° | 12.3 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.2 earthquake 7km SW of Holtville, CA with origin time 18:57 UTC on September 23, 2021. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-23 2021-09-23 18:53:17 UTC | 2.2ml | 7km SW of Holtville, CA 32.762°, -115.430° | 13.4 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.2 earthquake 7km SW of Holtville, CA came in on September 23, 2021 at 18:53 UTC. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-23 2021-09-23 18:53:12 UTC | 2.5md | 8 km SSE of Maria Antonia, Puerto Rico 17.904°, -66.859° | 14.0 km | - | - | - | ✓ Reviewed | USGS → |
On September 23, 2021, worldwide seismic activity registered a magnitude 2.5 earthquake 8 km SSE of Maria Antonia, Puerto Rico at 18:53 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.6 earthquake that occurred about 1 hours earlier. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-23 2021-09-23 18:32:31 UTC | 4.8mb | 174 km NE of Neiafu, Tonga -17.368°, -173.019° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.8 event was detected 174 km NE of Neiafu, Tonga on September 23, 2021, with origin time 18:32 UTC. The event was offshore. See the M4.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-23 2021-09-23 18:32:05 UTC | 4.2mb | 50 km SW of Leava, Wallis and Futuna -14.554°, -178.543° | 435.7 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.2 earthquake 50 km SW of Leava, Wallis and Futuna with origin time 18:32 UTC on September 23, 2021. This deep-focus earthquake originated far below the brittle crust, deep inside the mantle. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-23 2021-09-23 18:29:14 UTC | 4.3mb | 100 km SW of Abepura, Indonesia -3.321°, 140.092° | 32.7 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.3 earthquake 100 km SW of Abepura, Indonesia came in on September 23, 2021 at 18:29 UTC. The event was offshore. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-23 2021-09-23 18:24:39 UTC | 2.2md | 29km SE of Markleeville, CA 38.536°, -119.529° | 4.3 km | - | - | - | ✓ Reviewed | USGS → |
On September 23, 2021 at 18:24 UTC, a magnitude 2.2 earthquake struck 29km SE of Markleeville, CA. It arrived roughly 17 hours after a larger magnitude 3.6 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 M2.2 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 23, 2021. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.