Earthquakes on September 23, 2023
305
EARTHQUAKES on September 23, 2023
24-hour UTC period · USGS data
10 km deep
Elevated activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
1
M4.0–4.9
28
M3.0–3.9
13
M2.0–2.9
56
M1.0–1.9
207
Activity Summary
305
Total earthquakes
~250
Daily average
Elevated
Activity level
1
M5.0+ events
Geographic Breakdown
By US State
Significant Earthquakes (M4.5+)
5.3
275 km ESE of Tadine, New Caledonia
15:51 UTC · 10.0 km deep
4.8
38 km N of Yangon, Myanmar
14:24 UTC · 10.0 km deep
Felt by 71
4.8
Pacific-Antarctic Ridge
13:25 UTC · 10.0 km deep
4.7
56 km SSE of Kigoma, Tanzania
16:52 UTC · 10.0 km deep
Felt by 1
4.6
Mid-Indian Ridge
00:37 UTC · 10.0 km deep
4.5
Masbate region, Philippines
22:21 UTC · 10.0 km deep
4.5
125 km E of Kimbe, Papua New Guinea
18:50 UTC · 10.0 km deep
4.5
Izu Islands, Japan region
10:08 UTC · 10.0 km deep
Earthquake Map — September 23, 2023
All Earthquakes — September 23, 2023
Showing 30 of 98 (filtered from 305)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2023-09-23 2023-09-23 23:42:57 UTC | 3.5ml | 173 km E of Atka, Alaska 52.289°, -171.669° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 3.5 earthquake 173 km E of Atka, Alaska with origin time 23:42 UTC on September 23, 2023. The event was offshore. See the M3.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-23 2023-09-23 23:40:42 UTC | 3.9mb | Pagan region, Northern Mariana Islands 18.753°, 145.069° | 364.3 km | - | - | - | ✓ Reviewed | USGS → |
September 23, 2023 brought a magnitude 3.9 earthquake in the Pagan region, Northern Mariana Islands, logged at 23:40 UTC. This deep-focus earthquake originated far below the brittle crust, deep inside the mantle. See the M3.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-23 2023-09-23 23:25:36 UTC | 2.4ml | 72 km SE of Ugashik, Alaska 57.141°, -156.405° | 2.0 km | - | - | - | ✓ Reviewed | USGS → |
September 23, 2023 brought a magnitude 2.4 earthquake 72 km SE of Ugashik, Alaska, logged at 23:25 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-23 2023-09-23 23:22:10 UTC | 2.4ml | 71 km SE of Ugashik, Alaska 57.147°, -156.413° | 2.6 km | - | - | - | ✓ Reviewed | USGS → |
On September 23, 2023 at 23:22 UTC, a magnitude 2.4 earthquake struck 71 km SE of Ugashik, Alaska. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-23 2023-09-23 23:07:55 UTC | 2.5ml | northern Alaska 65.148°, -150.254° | 16.4 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.5 earthquake near northern Alaska with origin time 23:07 UTC on September 23, 2023. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-23 2023-09-23 23:06:44 UTC | 2.0ml(texnet) | 59 km SSW of Whites City, New Mexico 31.668°, -104.577° | 4.5 km | - | - | - | ✓ Reviewed | USGS → |
At 23:06 UTC on September 23, 2023, a magnitude 2.0 tremor occurred 59 km SSW of Whites City, New Mexico. This event falls inside the aftershock decay of a nearby magnitude 2.5 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. | ||||||||
2023-09-23 2023-09-23 22:40:37 UTC | 4.4mb | 6 km E of San Fernando, Philippines 12.482°, 123.819° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.4 earthquake was recorded 6 km E of San Fernando, Philippines on September 23, 2023 at 22:40 UTC. Coming 1 hours after a magnitude 4.5 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-23 2023-09-23 22:23:46 UTC | 2.4ml | 11 km SSW of Port Clarence, Alaska 65.174°, -166.959° | 7.7 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.4 earthquake was recorded 11 km SSW of Port Clarence, Alaska on September 23, 2023 at 22:23 UTC. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-23 2023-09-23 22:21:31 UTC | 4.5mb | Masbate region, Philippines 12.367°, 123.715° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.5 earthquake in the Masbate region, Philippines at 22:21 UTC on September 23, 2023. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-23 2023-09-23 22:11:54 UTC | 2.2md | 3 km ESE of Strawberry, Arkansas 35.953°, -91.286° | 11.8 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.2 event was detected 3 km ESE of Strawberry, Arkansas on September 23, 2023, with origin time 22:11 UTC. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-23 2023-09-23 22:02:35 UTC | 2.7md | 9 km NE of Alum Rock, CA 37.431°, -121.772° | 11.1 km | 37 | - | - | ✓ Reviewed | USGS → |
This magnitude 2.7 event was detected 9 km NE of Alum Rock, CA on September 23, 2023, with origin time 22:02 UTC. The event was offshore. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-23 2023-09-23 21:52:39 UTC | 3.3ml | 109 km SSW of Port Alexander, Alaska 55.375°, -135.431° | 4.5 km | 2 | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 3.3 earthquake 109 km SSW of Port Alexander, Alaska at 21:52 UTC on September 23, 2023. 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. | ||||||||
2023-09-23 2023-09-23 21:50:18 UTC | 2.9ml(texnet) | 8 km NE of Hermleigh, Texas 32.682°, -100.686° | 6.8 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.9 earthquake 8 km NE of Hermleigh, Texas with origin time 21:50 UTC on September 23, 2023. The event was offshore. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-23 2023-09-23 21:49:50 UTC | 2.8ml | Andreanof Islands, Aleutian Islands, Alaska 52.013°, -176.030° | 138.2 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.8 event was detected near Andreanof Islands, Aleutian Islands, Alaska on September 23, 2023, with origin time 21:49 UTC. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-23 2023-09-23 21:49:21 UTC | 3.4mb | 207 km SE of Nikolski, Alaska 51.913°, -166.307° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On September 23, 2023, worldwide seismic activity registered a magnitude 3.4 earthquake 207 km SE of Nikolski, Alaska at 21:49 UTC. The event was offshore. See the M3.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-23 2023-09-23 21:43:08 UTC | 2.7ml | 193 km SE of Chignik, Alaska 55.006°, -156.345° | 9.1 km | - | - | - | ✓ Reviewed | USGS → |
On September 23, 2023 at 21:43 UTC, a magnitude 2.7 earthquake struck 193 km SE of Chignik, Alaska. The event was offshore. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-23 2023-09-23 21:41:46 UTC | 2.5ml | Alaska Peninsula 54.455°, -162.483° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On September 23, 2023, worldwide seismic activity registered a magnitude 2.5 earthquake near Alaska Peninsula at 21:41 UTC. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-23 2023-09-23 21:05:17 UTC | 2.4md | 3 km SSE of Salinas, Puerto Rico 17.950°, -66.280° | 9.4 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.4 seismic event took place 3 km SSE of Salinas, Puerto Rico on September 23, 2023 at 21:05 UTC. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-23 2023-09-23 20:56:55 UTC | 2.0ml | 9 km ESE of Jefferson, Oklahoma 36.693°, -97.687° | 7.0 km | - | - | - | ✓ Reviewed | USGS → |
On September 23, 2023, worldwide seismic activity registered a magnitude 2.0 earthquake 9 km ESE of Jefferson, Oklahoma at 20:56 UTC. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-23 2023-09-23 20:52:30 UTC | 2.4ml | 9 km ENE of Honaunau-Napoopoo, Hawaii 19.479°, -155.778° | -1.6 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.4 earthquake 9 km ENE of Honaunau-Napoopoo, Hawaii came in on September 23, 2023 at 20:52 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-23 2023-09-23 20:38:15 UTC | 3.8ml | 36 km S of Sand Point, Alaska 55.007°, -160.447° | 40.5 km | - | II | - | ✓ Reviewed | USGS → |
A magnitude 3.8 earthquake was recorded 36 km S of Sand Point, Alaska on September 23, 2023 at 20:38 UTC. The event was offshore. See the M3.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-23 2023-09-23 20:24:18 UTC | 2.1ml | 14 km E of Milford, Utah 38.374°, -112.848° | 7.5 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.1 earthquake was recorded 14 km E of Milford, Utah on September 23, 2023 at 20:24 UTC. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-23 2023-09-23 20:23:19 UTC | 4.4mb | Myanmar 17.500°, 95.732° | 61.2 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.4 earthquake near Myanmar with origin time 20:23 UTC on September 23, 2023. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-23 2023-09-23 20:16:32 UTC | 4.3mwr | 54 km W of Ollagüe, Chile -21.148°, -68.768° | 125.5 km | - | - | - | ✓ Reviewed | USGS → |
September 23, 2023 brought a magnitude 4.3 earthquake 54 km W of Ollagüe, Chile, logged at 20:16 UTC. The event was offshore. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-23 2023-09-23 20:15:05 UTC | 4.3mb | south of the Fiji Islands -22.810°, 179.607° | 553.0 km | - | - | - | ✓ Reviewed | USGS → |
On September 23, 2023 at 20:15 UTC, a magnitude 4.3 earthquake struck south of the Fiji Islands. 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. | ||||||||
2023-09-23 2023-09-23 20:08:38 UTC | 2.0ml(texnet) | 40 km W of Mentone, Texas 31.649°, -104.023° | 6.1 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.0 earthquake 40 km W of Mentone, Texas at 20:08 UTC on September 23, 2023. Coming 6 hours after a magnitude 2.6 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-23 2023-09-23 19:43:12 UTC | 4.1mb | 136 km N of Maumere, Indonesia -7.404°, 122.002° | 10.2 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.1 event was detected 136 km N of Maumere, Indonesia on September 23, 2023, with origin time 19:43 UTC. The event was offshore. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-23 2023-09-23 19:29:45 UTC | 4.2mb | Fiji region -17.286°, -177.548° | 646.7 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.2 earthquake in the Fiji region with origin time 19:29 UTC on September 23, 2023. This is the deepest earthquake in the current dataset — a deep-focus event. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-23 2023-09-23 18:52:31 UTC | 4.0mb | 71 km WNW of La Ligua, Chile -32.136°, -71.890° | 34.9 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.0 seismic event took place 71 km WNW of La Ligua, Chile on September 23, 2023 at 18:52 UTC. See the M4.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-23 2023-09-23 18:50:16 UTC | 4.5mb | 125 km E of Kimbe, Papua New Guinea -5.651°, 151.264° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.5 event was detected 125 km E of Kimbe, Papua New Guinea on September 23, 2023, with origin time 18:50 UTC. The event was offshore. See the M4.5 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, 2023. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.