Earthquakes on September 4, 2023
285
EARTHQUAKES on September 4, 2023
24-hour UTC period · USGS data
LARGEST: M5.1 — north of Ascension Island
10 km deep
Normal activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
3
M4.0–4.9
36
M3.0–3.9
18
M2.0–2.9
66
M1.0–1.9
162
Activity Summary
285
Total earthquakes
~250
Daily average
Normal
Activity level
3
M5.0+ events
Geographic Breakdown
By US State
Top Countries (International)
Significant Earthquakes (M4.5+)
5.1
north of Ascension Island
14:47 UTC · 10.0 km deep
5.0
southern Mid-Atlantic Ridge
13:52 UTC · 10.0 km deep
5.0
98 km WNW of Tobelo, Indonesia
09:11 UTC · 104.3 km deep
4.8
Pacific-Antarctic Ridge
23:16 UTC · 10.0 km deep
4.7
north of Ascension Island
14:11 UTC · 10.0 km deep
4.6
Pacific-Antarctic Ridge
20:14 UTC · 10.0 km deep
4.6
59 km SW of Kaohsiung, Taiwan
13:56 UTC · 11.5 km deep
4.6
62 km WNW of Yonakuni, Japan
07:50 UTC · 36.9 km deep
Earthquake Map — September 4, 2023
All Earthquakes — September 4, 2023
Showing 30 of 123 (filtered from 285)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2023-09-04 2023-09-04 23:41:00 UTC | 4.1mb | Banda Sea -6.925°, 129.856° | 96.0 km | - | - | - | ✓ Reviewed | USGS → |
On September 4, 2023, worldwide seismic activity registered a magnitude 4.1 earthquake near Banda Sea at 23:41 UTC. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-04 2023-09-04 23:20:05 UTC | 2.5ml | 56 km S of Whites City, New Mexico 31.668°, -104.447° | 5.9 km | - | - | - | ✓ Reviewed | USGS → |
On September 4, 2023 at 23:20 UTC, a magnitude 2.5 earthquake struck 56 km S of Whites City, New Mexico. Coming 7 hours after a magnitude 2.7 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-04 2023-09-04 23:16:56 UTC | 4.8mb | Pacific-Antarctic Ridge -56.060°, -143.761° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On September 4, 2023, worldwide seismic activity registered a magnitude 4.8 earthquake near Pacific-Antarctic Ridge at 23:16 UTC. See the M4.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-04 2023-09-04 23:13:32 UTC | 4.0mwr | 90 km W of Copiapó, Chile -27.254°, -71.237° | 15.8 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.0 event was detected 90 km W of Copiapó, Chile on September 4, 2023, with origin time 23:13 UTC. It arrived roughly 5 hours after a larger magnitude 4.4 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M4.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-04 2023-09-04 23:12:52 UTC | 3.0ml | 214 km W of Adak, Alaska 51.779°, -179.740° | 105.6 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 3.0 earthquake 214 km W of Adak, Alaska at 23:12 UTC on September 4, 2023. The event was offshore. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-04 2023-09-04 23:05:43 UTC | 2.0ml | 37 km SSW of Tatitlek, Alaska 60.537°, -146.844° | 23.2 km | - | - | - | ✓ Reviewed | USGS → |
At 23:05 UTC on September 4, 2023, a magnitude 2.0 tremor occurred 37 km SSW of Tatitlek, Alaska. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-04 2023-09-04 22:55:52 UTC | 2.6ml | 42 km WNW of Nanwalek, Alaska 59.474°, -152.624° | 88.3 km | - | - | - | ✓ Reviewed | USGS → |
At 22:55 UTC on September 4, 2023, a magnitude 2.6 tremor occurred 42 km WNW of Nanwalek, Alaska. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-04 2023-09-04 22:45:39 UTC | 4.1mwr | 64 km W of San Antonio de los Cobres, Argentina -24.125°, -66.946° | 181.2 km | - | - | - | ✓ Reviewed | USGS → |
At 22:45 UTC on September 4, 2023, a magnitude 4.1 tremor occurred 64 km W of San Antonio de los Cobres, Argentina. The event was offshore. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-04 2023-09-04 22:43:32 UTC | 2.0md | 7 km SW of Volcano, Hawaii 19.389°, -155.277° | 1.7 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.0 earthquake 7 km SW of Volcano, Hawaii with origin time 22:43 UTC on September 4, 2023. This event falls inside the aftershock decay of a nearby magnitude 2.4 earthquake that occurred about 22 hours earlier. 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. | ||||||||
2023-09-04 2023-09-04 22:34:01 UTC | 4.5mb | 123 km SE of Lata, Solomon Islands -11.630°, 166.462° | 120.3 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.5 seismic event took place 123 km SE of Lata, Solomon Islands on September 4, 2023 at 22:34 UTC. The event was offshore. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-04 2023-09-04 21:43:42 UTC | 3.7md | 142 km N of Charlotte Amalie, U.S. Virgin Islands 19.631°, -64.948° | 25.0 km | - | - | - | ✓ Reviewed | USGS → |
On September 4, 2023, worldwide seismic activity registered a magnitude 3.7 earthquake 142 km N of Charlotte Amalie, U.S. Virgin Islands at 21:43 UTC. The event was offshore. See the M3.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-04 2023-09-04 21:24:19 UTC | 2.1ml | Island of Hawaii, Hawaii 19.224°, -155.383° | -1.7 km | - | - | - | Auto | USGS → |
On September 4, 2023, worldwide seismic activity registered a magnitude 2.1 earthquake near Island of Hawaii, Hawaii at 21:24 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.7 earthquake that occurred about 20 hours earlier. 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. | ||||||||
2023-09-04 2023-09-04 21:18:52 UTC | 3.6ml | 13 km E of Wright, Wyoming 43.769°, -105.325° | 0.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 3.6 event was detected 13 km E of Wright, Wyoming on September 4, 2023, with origin time 21:18 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M3.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-04 2023-09-04 21:16:12 UTC | 2.3ml | 47 km SW of Cantwell, Alaska 63.118°, -149.683° | 84.6 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.3 earthquake was recorded 47 km SW of Cantwell, Alaska on September 4, 2023 at 21:16 UTC. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-04 2023-09-04 21:12:40 UTC | 4.4mb | 76 km ESE of Tomioka, Japan 37.013°, 141.774° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.4 earthquake was recorded 76 km ESE of Tomioka, Japan on September 4, 2023 at 21:12 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-04 2023-09-04 21:08:17 UTC | 2.0ml | 73 km SE of Ugashik, Alaska 57.108°, -156.438° | 3.5 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.0 earthquake 73 km SE of Ugashik, Alaska at 21:08 UTC on September 4, 2023. This event falls inside the aftershock decay of a nearby magnitude 2.5 earthquake that occurred about 1 hours earlier. 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. | ||||||||
2023-09-04 2023-09-04 20:23:25 UTC | 2.5ml | Alaska Peninsula 57.139°, -156.401° | 2.2 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.5 earthquake was recorded near Alaska Peninsula on September 4, 2023 at 20:23 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-04 2023-09-04 20:14:16 UTC | 4.6mb | Pacific-Antarctic Ridge -65.850°, -175.649° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.6 earthquake near Pacific-Antarctic Ridge at 20:14 UTC on September 4, 2023. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-04 2023-09-04 20:01:38 UTC | 4.0mb | 143 km SSE of Nikolski, Alaska 51.772°, -167.974° | 36.2 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.0 earthquake 143 km SSE of Nikolski, Alaska came in on September 4, 2023 at 20:01 UTC. See the M4.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-04 2023-09-04 19:59:59 UTC | 2.6ml | 58 km S of Whites City, New Mexico 31.654°, -104.458° | 6.8 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.6 earthquake 58 km S of Whites City, New Mexico at 19:59 UTC on September 4, 2023. It arrived roughly 4 hours after a larger magnitude 2.7 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-04 2023-09-04 19:57:32 UTC | 4.3mb | 87 km WNW of Mohr, Iran 27.962°, 52.122° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
September 4, 2023 brought a magnitude 4.3 earthquake 87 km WNW of Mohr, Iran, logged at 19:57 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-04 2023-09-04 19:33:33 UTC | 2.2md | 13 km NNE of Shingletown, CA 40.602°, -121.829° | 14.4 km | - | - | - | ✓ Reviewed | USGS → |
At 19:33 UTC on September 4, 2023, a magnitude 2.2 tremor occurred 13 km NNE of Shingletown, CA. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-04 2023-09-04 19:33:05 UTC | 2.1ml | 209 km WSW of Adak, Alaska 51.322°, -179.527° | 15.7 km | - | - | - | ✓ Reviewed | USGS → |
At 19:33 UTC on September 4, 2023, a magnitude 2.1 tremor occurred 209 km WSW of Adak, Alaska. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-04 2023-09-04 19:07:04 UTC | 2.8ml | 40 km SSW of Sand Point, Alaska 54.994°, -160.704° | 26.3 km | - | - | - | ✓ Reviewed | USGS → |
On September 4, 2023, worldwide seismic activity registered a magnitude 2.8 earthquake 40 km SSW of Sand Point, Alaska at 19:07 UTC. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-04 2023-09-04 17:58:46 UTC | 2.4ml | 20 km SSE of Tanana, Alaska 65.015°, -151.850° | 17.0 km | - | - | - | ✓ Reviewed | USGS → |
At 17:58 UTC on September 4, 2023, a magnitude 2.4 tremor occurred 20 km SSE of Tanana, Alaska. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-04 2023-09-04 17:56:45 UTC | 3.4ml | 19 km SW of Lamont, CA 35.117°, -119.034° | 12.8 km | 7 | - | - | ✓ Reviewed | USGS → |
A magnitude 3.4 earthquake was recorded 19 km SW of Lamont, CA on September 4, 2023 at 17:56 UTC. The event was offshore. See the M3.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-04 2023-09-04 17:56:11 UTC | 2.4md | Tennessee-North Carolina border region 35.927°, -83.958° | 21.5 km | 2 | - | - | ✓ Reviewed | USGS → |
September 4, 2023 brought a magnitude 2.4 earthquake in the Tennessee-North Carolina border region, logged at 17:56 UTC. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-04 2023-09-04 17:54:25 UTC | 2.1ml | 137 km WSW of Nikolski, Alaska 52.684°, -170.852° | 1.2 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.1 earthquake 137 km WSW of Nikolski, Alaska at 17:54 UTC on September 4, 2023. It arrived roughly 1 hours after a larger magnitude 3.1 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. | ||||||||
2023-09-04 2023-09-04 17:53:07 UTC | 2.0ml | 94 km SSW of Nikolski, Alaska 52.142°, -169.360° | 32.4 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.0 event was detected 94 km SSW of Nikolski, Alaska on September 4, 2023, with origin time 17:53 UTC. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-04 2023-09-04 17:49:29 UTC | 3.6md | Puerto Rico region 19.267°, -65.675° | 44.0 km | 1 | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 3.6 earthquake in the Puerto Rico region came in on September 4, 2023 at 17:49 UTC. See the M3.6 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 4, 2023. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.