Earthquakes on September 20, 2023
270
EARTHQUAKES on September 20, 2023
24-hour UTC period · USGS data
LARGEST: M5.9 — central East Pacific Rise
10 km deep · 1 person felt it
Normal activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
6
M4.0–4.9
29
M3.0–3.9
9
M2.0–2.9
43
M1.0–1.9
183
Activity Summary
270
Total earthquakes
~250
Daily average
Normal
Activity level
6
M5.0+ events
Geographic Breakdown
By US State
Significant Earthquakes (M4.5+)
5.9
central East Pacific Rise
14:45 UTC · 10.0 km deep
Felt by 1
5.8
central East Pacific Rise
15:03 UTC · 10.0 km deep
5.7
Prince Edward Islands region
19:22 UTC · 10.0 km deep
5.2
central East Pacific Rise
14:45 UTC · 10.0 km deep
5.1
Kermadec Islands, New Zealand
02:38 UTC · 49.9 km deep
5.0
102 km SSE of Sola, Vanuatu
09:32 UTC · 10.0 km deep
4.9
West Chile Rise
00:27 UTC · 10.0 km deep
4.7
257 km SSE of Hiroo, Japan
00:49 UTC · 10.0 km deep
Earthquake Map — September 20, 2023
All Earthquakes — September 20, 2023
Showing 30 of 87 (filtered from 270)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2023-09-20 2023-09-20 23:27:57 UTC | 2.0ml | 94 km SW of Karluk, Alaska 57.089°, -155.746° | 63.0 km | - | - | - | ✓ Reviewed | USGS → |
On September 20, 2023, worldwide seismic activity registered a magnitude 2.0 earthquake 94 km SW of Karluk, Alaska at 23:27 UTC. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-20 2023-09-20 23:26:09 UTC | 2.4ml | 103 km SSE of Sand Point, Alaska 54.526°, -159.717° | 25.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.4 earthquake 103 km SSE of Sand Point, Alaska with origin time 23:26 UTC on September 20, 2023. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-20 2023-09-20 23:25:14 UTC | 4.4mb | 223 km NNW of Tobelo, Indonesia 3.469°, 126.988° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.4 earthquake 223 km NNW of Tobelo, Indonesia at 23:25 UTC on September 20, 2023. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-20 2023-09-20 23:15:47 UTC | 3.4ml | Central Alaska 63.009°, -150.921° | 117.8 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 3.4 seismic event took place near Central Alaska on September 20, 2023 at 23:15 UTC. See the M3.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-20 2023-09-20 23:12:29 UTC | 2.4ml | 47 km ESE of Pedro Bay, Alaska 59.697°, -153.283° | 107.4 km | - | - | - | ✓ Reviewed | USGS → |
On September 20, 2023, worldwide seismic activity registered a magnitude 2.4 earthquake 47 km ESE of Pedro Bay, Alaska at 23:12 UTC. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-20 2023-09-20 22:49:25 UTC | 2.1ml | 10 km NW of Velma, Oklahoma 34.515°, -97.769° | 14.8 km | - | - | - | ✓ Reviewed | USGS → |
At 22:49 UTC on September 20, 2023, a magnitude 2.1 tremor occurred 10 km NW of Velma, Oklahoma. Coming 12 hours after a magnitude 2.9 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. | ||||||||
2023-09-20 2023-09-20 22:47:28 UTC | 2.8md | 0 km E of Valley Ranch, CA 39.739°, -120.563° | 1.1 km | 5 | - | - | ✓ Reviewed | USGS → |
This magnitude 2.8 event was detected 0 km E of Valley Ranch, CA on September 20, 2023, with origin time 22:47 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-20 2023-09-20 22:38:13 UTC | 4.1mb | 98 km W of Copiapó, Chile -27.282°, -71.323° | 13.4 km | - | - | - | ✓ Reviewed | USGS → |
On September 20, 2023 at 22:38 UTC, a magnitude 4.1 earthquake struck 98 km W of Copiapó, Chile. The event was offshore. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-20 2023-09-20 22:17:33 UTC | 4.6mb | 216 km NW of Kuril’sk, Russia 46.790°, 146.207° | 347.8 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.6 seismic event took place 216 km NW of Kuril’sk, Russia on September 20, 2023 at 22:17 UTC. This deep-focus earthquake originated far below the brittle crust, deep inside the mantle. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-20 2023-09-20 22:03:26 UTC | 3.1ml | Unimak Island region, Alaska 53.619°, -164.815° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
On September 20, 2023, worldwide seismic activity registered a magnitude 3.1 earthquake in the Unimak Island region, Alaska at 22:03 UTC. See the M3.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-20 2023-09-20 21:45:13 UTC | 2.1md | Island of Hawaii, Hawaii 19.247°, -155.391° | 32.1 km | - | - | - | Auto | USGS → |
On September 20, 2023 at 21:45 UTC, a magnitude 2.1 earthquake struck near Island of Hawaii, Hawaii. Coming 20 hours after a magnitude 2.1 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. | ||||||||
2023-09-20 2023-09-20 21:26:15 UTC | 2.0ml | 10 km W of Point MacKenzie, Alaska 61.361°, -150.172° | 43.3 km | - | - | - | ✓ Reviewed | USGS → |
At 21:26 UTC on September 20, 2023, a magnitude 2.0 tremor occurred 10 km W of Point MacKenzie, Alaska. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-20 2023-09-20 20:55:13 UTC | 4.4mb | central East Pacific Rise -8.884°, -108.268° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.4 event was detected near central East Pacific Rise on September 20, 2023, with origin time 20:55 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-20 2023-09-20 20:08:23 UTC | 2.5ml | Southern Alaska 60.013°, -153.475° | 158.5 km | 1 | - | - | ✓ Reviewed | USGS → |
September 20, 2023 brought a magnitude 2.5 earthquake near Southern Alaska, logged at 20:08 UTC. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-20 2023-09-20 20:05:07 UTC | 4.2mb | 82 km SSW of Labuan, Indonesia -7.074°, 105.568° | 69.6 km | - | - | - | ✓ Reviewed | USGS → |
At 20:05 UTC on September 20, 2023, a magnitude 4.2 tremor occurred 82 km SSW of Labuan, Indonesia. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-20 2023-09-20 19:46:19 UTC | 2.1md | 4 km SW of La Parguera, Puerto Rico 17.953°, -67.081° | 7.4 km | - | - | - | ✓ Reviewed | USGS → |
On September 20, 2023, worldwide seismic activity registered a magnitude 2.1 earthquake 4 km SW of La Parguera, Puerto Rico at 19:46 UTC. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-20 2023-09-20 19:39:59 UTC | 2.3ml | Rat Islands, Aleutian Islands, Alaska 51.802°, 178.465° | 97.9 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.3 event was detected near Rat Islands, Aleutian Islands, Alaska on September 20, 2023, with origin time 19:39 UTC. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-20 2023-09-20 19:34:41 UTC | 3.3ml | 9 km SE of Wright, Wyoming 43.700°, -105.395° | 0.0 km | - | - | - | ✓ Reviewed | USGS → |
September 20, 2023 brought a magnitude 3.3 earthquake 9 km SE of Wright, Wyoming, logged at 19:34 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M3.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-20 2023-09-20 19:30:59 UTC | 4.4mb | South Sandwich Islands region -55.407°, -28.858° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.4 earthquake in the South Sandwich Islands region came in on September 20, 2023 at 19:30 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-20 2023-09-20 19:22:32 UTC | 5.7mww | Prince Edward Islands region -44.894°, 35.202° | 10.0 km | - | - | green | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 5.7 earthquake in the Prince Edward Islands region with origin time 19:22 UTC on September 20, 2023. The USGS PAGER system assigned a green alert level for this event, signalling no significant casualties or damage expected. See the M5.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-20 2023-09-20 19:15:32 UTC | 2.8mb_lg | 7 km NNW of El Moro, Colorado 37.293°, -104.490° | 5.2 km | 8 | - | - | ✓ Reviewed | USGS → |
A magnitude 2.8 seismic event took place 7 km NNW of El Moro, Colorado on September 20, 2023 at 19:15 UTC. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-20 2023-09-20 19:12:26 UTC | 3.2ml | Rat Islands, Aleutian Islands, Alaska 51.860°, 179.936° | 146.3 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 3.2 earthquake was recorded near Rat Islands, Aleutian Islands, Alaska on September 20, 2023 at 19:12 UTC. See the M3.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-20 2023-09-20 18:55:59 UTC | 2.3ml | 130 km N of Nikolski, Alaska 54.116°, -168.909° | 21.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.3 earthquake 130 km N of Nikolski, Alaska came in on September 20, 2023 at 18:55 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.7 earthquake that occurred about 4 hours earlier. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-20 2023-09-20 18:55:47 UTC | 2.2ml | 48 km E of Pedro Bay, Alaska 59.727°, -153.246° | 126.2 km | - | - | - | ✓ Reviewed | USGS → |
September 20, 2023 brought a magnitude 2.2 earthquake 48 km E of Pedro Bay, Alaska, logged at 18:55 UTC. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-20 2023-09-20 18:45:59 UTC | 2.2ml | Rat Islands, Aleutian Islands, Alaska 51.468°, 178.833° | 34.6 km | - | - | - | ✓ Reviewed | USGS → |
On September 20, 2023 at 18:45 UTC, a magnitude 2.2 earthquake struck near Rat Islands, Aleutian Islands, Alaska. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-20 2023-09-20 18:04:44 UTC | 2.1ml | Rat Islands, Aleutian Islands, Alaska 51.842°, 178.619° | 96.3 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.1 earthquake near Rat Islands, Aleutian Islands, Alaska came in on September 20, 2023 at 18:04 UTC. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-20 2023-09-20 18:00:45 UTC | 4.2mb | 32 km NNE of Ransiki, Indonesia -1.254°, 134.324° | 29.7 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.2 earthquake 32 km NNE of Ransiki, Indonesia at 18:00 UTC on September 20, 2023. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-20 2023-09-20 17:09:47 UTC | 2.1ml(texnet) | 57 km S of Whites City, New Mexico 31.655°, -104.362° | 5.5 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.1 seismic event took place 57 km S of Whites City, New Mexico on September 20, 2023 at 17:09 UTC. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-20 2023-09-20 17:05:58 UTC | 2.7ml | Andreanof Islands, Aleutian Islands, Alaska 51.096°, -177.623° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.7 earthquake near Andreanof Islands, Aleutian Islands, Alaska with origin time 17:05 UTC on September 20, 2023. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-20 2023-09-20 16:09:55 UTC | 2.8ml(texnet) | 41 km WNW of Toyah, Texas 31.519°, -104.164° | 6.6 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.8 earthquake 41 km WNW of Toyah, Texas came in on September 20, 2023 at 16:09 UTC. See the M2.8 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, 2023. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.