Earthquakes on September 15, 2023
256
EARTHQUAKES on September 15, 2023
24-hour UTC period · USGS data
LARGEST: M5.7 — 122 km W of Copiapó, Chile
8 km deep
Normal activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
6
M4.0–4.9
39
M3.0–3.9
16
M2.0–2.9
52
M1.0–1.9
143
Activity Summary
256
Total earthquakes
~250
Daily average
Normal
Activity level
6
M5.0+ events
Geographic Breakdown
By US State
Significant Earthquakes (M4.5+)
5.7
122 km W of Copiapó, Chile
18:07 UTC · 8.0 km deep
5.1
Kermadec Islands, New Zealand
13:02 UTC · 36.7 km deep
5.1
South Sandwich Islands region
02:37 UTC · 10.0 km deep
5.0
south of Tonga
23:07 UTC · 35.0 km deep
5.0
124 km WNW of Ternate, Indonesia
18:16 UTC · 12.1 km deep
5.0
South Sandwich Islands region
09:30 UTC · 10.0 km deep
4.8
82 km NW of Hihifo, Tonga
17:04 UTC · 184.1 km deep
4.8
42 km NNW of Saipan, Northern Mariana Islands
08:00 UTC · 10.0 km deep
Earthquake Map — September 15, 2023
All Earthquakes — September 15, 2023
Showing 30 of 113 (filtered from 256)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2023-09-15 2023-09-15 23:57:50 UTC | 2.1md | 18 km SSW of Guánica, Puerto Rico 17.813°, -66.950° | 6.9 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.1 earthquake 18 km SSW of Guánica, Puerto Rico with origin time 23:57 UTC on September 15, 2023. Coming 15 hours after a magnitude 3.4 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. | ||||||||
2023-09-15 2023-09-15 23:47:41 UTC | 2.1ml | northern Alaska 68.922°, -145.275° | 3.7 km | - | - | - | ✓ Reviewed | USGS → |
At 23:47 UTC on September 15, 2023, a magnitude 2.1 tremor occurred near northern Alaska. 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. | ||||||||
2023-09-15 2023-09-15 23:07:01 UTC | 5.0mb | south of Tonga -24.226°, -175.666° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
On September 15, 2023, worldwide seismic activity registered a magnitude 5.0 earthquake south of Tonga at 23:07 UTC. See the M5.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-15 2023-09-15 23:05:44 UTC | 3.0ml | 55 km SE of Nikolski, Alaska 52.619°, -168.225° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 3.0 seismic event took place 55 km SE of Nikolski, Alaska on September 15, 2023 at 23:05 UTC. The event was offshore. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-15 2023-09-15 22:58:45 UTC | 4.3mb | 110 km NNW of Finschhafen, Papua New Guinea -5.634°, 147.471° | 178.4 km | - | - | - | ✓ Reviewed | USGS → |
September 15, 2023 brought a magnitude 4.3 earthquake 110 km NNW of Finschhafen, Papua New Guinea, logged at 22:58 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-15 2023-09-15 22:57:15 UTC | 4.2mb | 51 km SE of Ýdra, Greece 37.062°, 23.920° | 119.4 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.2 earthquake 51 km SE of Ýdra, Greece at 22:57 UTC on September 15, 2023. The event was offshore. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-15 2023-09-15 22:31:27 UTC | 4.2mb | 54 km ESE of Ollagüe, Chile -21.345°, -67.745° | 228.3 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.2 event was detected 54 km ESE of Ollagüe, Chile on September 15, 2023, with origin time 22:31 UTC. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-15 2023-09-15 22:24:16 UTC | 3.2ml | 27 km S of Mina, Nevada 38.151°, -118.163° | 11.4 km | 2 | - | - | ✓ Reviewed | USGS → |
This magnitude 3.2 event was detected 27 km S of Mina, Nevada on September 15, 2023, with origin time 22:24 UTC. The event was offshore. See the M3.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-15 2023-09-15 21:45:36 UTC | 2.4md | 15 km E of Johnstonville, CA 40.409°, -120.412° | -1.7 km | - | - | - | ✓ Reviewed | USGS → |
On September 15, 2023, worldwide seismic activity registered a magnitude 2.4 earthquake 15 km E of Johnstonville, CA at 21:45 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. | ||||||||
2023-09-15 2023-09-15 21:41:15 UTC | 2.8md | 8 km W of Fall River Mills, CA 40.998°, -121.537° | 13.7 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.8 earthquake 8 km W of Fall River Mills, CA with origin time 21:41 UTC on September 15, 2023. The event was offshore. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-15 2023-09-15 21:22:58 UTC | 2.2ml | Kenai Peninsula, Alaska 59.808°, -148.555° | 2.6 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.2 earthquake near Kenai Peninsula, Alaska came in on September 15, 2023 at 21:22 UTC. 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. | ||||||||
2023-09-15 2023-09-15 20:53:32 UTC | 4.2mb | 126 km NNW of Finschhafen, Papua New Guinea -5.525°, 147.347° | 201.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.2 earthquake 126 km NNW of Finschhafen, Papua New Guinea came in on September 15, 2023 at 20:53 UTC. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-15 2023-09-15 20:44:19 UTC | 2.6ml | 91 km SE of Akutan, Alaska 53.656°, -164.641° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.6 earthquake was recorded 91 km SE of Akutan, Alaska on September 15, 2023 at 20:44 UTC. Coming 8 hours after a magnitude 3.3 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-15 2023-09-15 20:34:48 UTC | 2.1ml | 194 km W of Adak, Alaska 51.626°, -179.427° | 74.9 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.1 earthquake 194 km W of Adak, Alaska at 20:34 UTC on September 15, 2023. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-15 2023-09-15 20:33:09 UTC | 2.1ml | 11 km SE of Pāhala, Hawaii 19.127°, -155.399° | 31.8 km | - | - | - | Auto | USGS → |
On September 15, 2023, worldwide seismic activity registered a magnitude 2.1 earthquake 11 km SE of Pāhala, Hawaii at 20:33 UTC. It arrived roughly 15 hours after a larger magnitude 3.3 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-15 2023-09-15 20:22:29 UTC | 2.1md | 2 km S of Pāhala, Hawaii 19.183°, -155.479° | 33.3 km | - | - | - | Auto | USGS → |
A magnitude 2.1 earthquake was recorded 2 km S of Pāhala, Hawaii on September 15, 2023 at 20:22 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.3 earthquake that occurred about 15 hours earlier. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-15 2023-09-15 20:15:37 UTC | 3.3ml | 101 km NNE of Adak, Alaska 52.655°, -175.871° | 199.5 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 3.3 earthquake was recorded 101 km NNE of Adak, Alaska on September 15, 2023 at 20:15 UTC. See the M3.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-15 2023-09-15 19:51:29 UTC | 4.4mb | 211 km SSE of Ambon, Indonesia -5.451°, 128.935° | 296.6 km | - | - | - | ✓ Reviewed | USGS → |
On September 15, 2023 at 19:51 UTC, a magnitude 4.4 earthquake struck 211 km SSE of Ambon, Indonesia. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-15 2023-09-15 19:42:15 UTC | 2.1ml | 73 km N of Petersville, Alaska 63.146°, -150.520° | 111.7 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.1 event was detected 73 km N of Petersville, Alaska on September 15, 2023, with origin time 19:42 UTC. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-15 2023-09-15 19:35:57 UTC | 4.5mb | 46 km ESE of Tomioka, Japan 37.197°, 141.516° | 42.1 km | 1 | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.5 earthquake 46 km ESE of Tomioka, Japan at 19:35 UTC on September 15, 2023. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-15 2023-09-15 19:29:58 UTC | 4.4mb | 144 km WNW of Mosquera, Colombia 2.804°, -79.714° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.4 earthquake was recorded 144 km WNW of Mosquera, Colombia on September 15, 2023 at 19:29 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-15 2023-09-15 19:13:09 UTC | 2.2md | 1 km NW of Green Valley, CA 38.261°, -122.173° | 8.8 km | - | - | - | ✓ Reviewed | USGS → |
On September 15, 2023 at 19:13 UTC, a magnitude 2.2 earthquake struck 1 km NW of Green Valley, CA. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-15 2023-09-15 19:09:55 UTC | 3.8mb | 78 km SE of Adak, Alaska 51.405°, -175.784° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 3.8 earthquake 78 km SE of Adak, Alaska came in on September 15, 2023 at 19:09 UTC. The event was offshore. See the M3.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-15 2023-09-15 18:34:47 UTC | 2.8ml | 91 km SE of Akutan, Alaska 53.651°, -164.649° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
On September 15, 2023, worldwide seismic activity registered a magnitude 2.8 earthquake 91 km SE of Akutan, Alaska at 18:34 UTC. It arrived roughly 5 hours after a larger magnitude 3.3 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-15 2023-09-15 18:17:44 UTC | 4.5mb | South Sandwich Islands region -56.927°, -26.947° | 146.8 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.5 event was detected in the South Sandwich Islands region on September 15, 2023, with origin time 18:17 UTC. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-15 2023-09-15 18:16:01 UTC | 5.0mb | 124 km WNW of Ternate, Indonesia 1.131°, 126.320° | 12.1 km | - | - | - | ✓ Reviewed | USGS → |
At 18:16 UTC on September 15, 2023, a magnitude 5.0 tremor occurred 124 km WNW of Ternate, Indonesia. See the M5.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-15 2023-09-15 18:08:36 UTC | 4.3mb | 87 km NE of Khandūd, Afghanistan 37.396°, 73.131° | 72.5 km | - | - | - | ✓ Reviewed | USGS → |
On September 15, 2023 at 18:08 UTC, a magnitude 4.3 earthquake struck 87 km NE of Khandūd, Afghanistan. The event was offshore. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-15 2023-09-15 18:07:39 UTC | 5.7mww | 122 km W of Copiapó, Chile -27.305°, -71.567° | 8.0 km | - | IV | green | ✓ Reviewed | USGS → |
On September 15, 2023 at 18:07 UTC, a magnitude 5.7 earthquake struck 122 km W of Copiapó, Chile. 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 15, 2023. See the M5.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-15 2023-09-15 18:02:26 UTC | 2.7md | 2 km NE of Almanor, CA 40.231°, -121.159° | 0.0 km | 3 | - | - | ✓ Reviewed | USGS → |
This magnitude 2.7 event was detected 2 km NE of Almanor, CA on September 15, 2023, with origin time 18:02 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-15 2023-09-15 18:00:46 UTC | 3.9md | 131 km N of Cruz Bay, U.S. Virgin Islands 19.522°, -64.728° | 85.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 3.9 event was detected 131 km N of Cruz Bay, U.S. Virgin Islands on September 15, 2023, with origin time 18:00 UTC. The event was offshore. See the M3.9 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 15, 2023. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.