Earthquakes on September 27, 2023
249
EARTHQUAKES on September 27, 2023
24-hour UTC period · USGS data
LARGEST: M5.6 — Pacific-Antarctic Ridge
10 km deep
Normal activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
4
M4.0–4.9
29
M3.0–3.9
12
M2.0–2.9
53
M1.0–1.9
151
Activity Summary
249
Total earthquakes
~250
Daily average
Normal
Activity level
4
M5.0+ events
Geographic Breakdown
By US State
Top Countries (International)
Significant Earthquakes (M4.5+)
5.6
Pacific-Antarctic Ridge
17:37 UTC · 10.0 km deep
5.5
off the west coast of northern Sumatra
17:47 UTC · 10.0 km deep
5.0
6 km W of Amahai, Indonesia
16:15 UTC · 17.6 km deep
5.0
Izu Islands, Japan region
02:54 UTC · 11.8 km deep
4.8
296 km ESE of Levuka, Fiji
18:00 UTC · 613.9 km deep
4.7
68 km NNW of Masohi, Indonesia
22:32 UTC · 23.6 km deep
4.7
Kermadec Islands region
05:32 UTC · 10.4 km deep
4.7
40 km S of Sand Point, Alaska
02:14 UTC · 53.3 km deep
Felt by 6
Earthquake Map — September 27, 2023
All Earthquakes — September 27, 2023
Showing 30 of 98 (filtered from 249)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2023-09-27 2023-09-27 23:59:04 UTC | 4.5mb | south of Panama 4.997°, -82.771° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On September 27, 2023 at 23:59 UTC, a magnitude 4.5 earthquake struck south of Panama. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-27 2023-09-27 23:58:59 UTC | 2.8ml | northern Alaska 66.493°, -157.240° | 7.4 km | - | - | - | ✓ Reviewed | USGS → |
On September 27, 2023 at 23:58 UTC, a magnitude 2.8 earthquake struck near northern Alaska. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-27 2023-09-27 23:58:47 UTC | 4.0mb | 139 km N of Lae, Papua New Guinea -5.464°, 147.073° | 178.4 km | - | - | - | ✓ Reviewed | USGS → |
September 27, 2023 brought a magnitude 4.0 earthquake 139 km N of Lae, Papua New Guinea, logged at 23:58 UTC. The event was offshore. See the M4.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-27 2023-09-27 23:46:44 UTC | 4.0mb | 135 km NNE of Shi Yomi, India 29.721°, 94.667° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On September 27, 2023 at 23:46 UTC, a magnitude 4.0 earthquake struck 135 km NNE of Shi Yomi, India. See the M4.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-27 2023-09-27 23:43:11 UTC | 4.4mb | south of the Fiji Islands -22.186°, -179.537° | 579.6 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.4 earthquake south of the Fiji Islands came in on September 27, 2023 at 23:43 UTC. 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. | ||||||||
2023-09-27 2023-09-27 23:30:05 UTC | 2.3ml | 110 km WSW of Adak, Alaska 51.523°, -178.133° | 6.7 km | - | - | - | ✓ Reviewed | USGS → |
On September 27, 2023, worldwide seismic activity registered a magnitude 2.3 earthquake 110 km WSW of Adak, Alaska at 23:30 UTC. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-27 2023-09-27 23:02:38 UTC | 4.0mb | 71 km SSW of Atocha, Bolivia -21.480°, -66.590° | 234.7 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.0 earthquake was recorded 71 km SSW of Atocha, Bolivia on September 27, 2023 at 23:02 UTC. See the M4.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-27 2023-09-27 23:01:57 UTC | 2.3md | 5 km SSE of Parkfield, CA 35.859°, -120.402° | 5.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.3 seismic event took place 5 km SSE of Parkfield, CA on September 27, 2023 at 23:01 UTC. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-27 2023-09-27 22:55:21 UTC | 2.3ml | 4 km SSW of Pāhala, Hawaii 19.165°, -155.495° | 31.1 km | - | - | - | Auto | USGS → |
Reports of a magnitude 2.3 earthquake 4 km SSW of Pāhala, Hawaii came in on September 27, 2023 at 22:55 UTC. Coming 1 hours after a magnitude 2.9 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-27 2023-09-27 22:54:58 UTC | 4.3mb | 233 km E of Levuka, Fiji -18.020°, -178.474° | 592.4 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.3 earthquake was recorded 233 km E of Levuka, Fiji on September 27, 2023 at 22:54 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. | ||||||||
2023-09-27 2023-09-27 22:49:48 UTC | 2.9ml | 12 km ESE of Pāhala, Hawaii 19.140°, -155.376° | 30.4 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.9 seismic event took place 12 km ESE of Pāhala, Hawaii on September 27, 2023 at 22:49 UTC. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-27 2023-09-27 22:32:59 UTC | 4.7mb | 68 km NNW of Masohi, Indonesia -2.723°, 128.745° | 23.6 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.7 earthquake 68 km NNW of Masohi, Indonesia at 22:32 UTC on September 27, 2023. See the M4.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-27 2023-09-27 22:18:39 UTC | 2.0ml | 30 km SW of Hawthorne, Nevada 38.359°, -118.906° | 7.4 km | - | - | - | ✓ Reviewed | USGS → |
At 22:18 UTC on September 27, 2023, a magnitude 2.0 tremor occurred 30 km SW of Hawthorne, Nevada. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-27 2023-09-27 22:16:12 UTC | 4.4mb | Carlsberg Ridge 2.503°, 66.425° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.4 seismic event took place near Carlsberg Ridge on September 27, 2023 at 22:16 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-27 2023-09-27 22:10:37 UTC | 3.2md | Puerto Rico region 18.888°, -65.346° | 14.9 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 3.2 seismic event took place in the Puerto Rico region on September 27, 2023 at 22:10 UTC. See the M3.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-27 2023-09-27 21:49:54 UTC | 2.5md | 10 km NW of The Geysers, CA 38.838°, -122.836° | 1.1 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.5 earthquake 10 km NW of The Geysers, CA at 21:49 UTC on September 27, 2023. In the 72 hours after this event, the USGS recorded 6 smaller earthquakes within 20 km, consistent with an ongoing aftershock sequence rooted here. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-27 2023-09-27 21:49:02 UTC | 2.7md | 5 km SSE of Salinas, Puerto Rico 17.927°, -66.279° | 7.3 km | - | - | - | ✓ Reviewed | USGS → |
September 27, 2023 brought a magnitude 2.7 earthquake 5 km SSE of Salinas, Puerto Rico, logged at 21:49 UTC. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-27 2023-09-27 21:27:14 UTC | 4.5mb | Balleny Islands region -61.359°, 154.816° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.5 earthquake was recorded in the Balleny Islands region on September 27, 2023 at 21:27 UTC. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-27 2023-09-27 21:14:02 UTC | 2.1ml | 13 km S of Princeton, Canada 49.335°, -120.507° | -0.4 km | - | - | - | ✓ Reviewed | USGS → |
On September 27, 2023, worldwide seismic activity registered a magnitude 2.1 earthquake 13 km S of Princeton, Canada at 21:14 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. | ||||||||
2023-09-27 2023-09-27 20:36:20 UTC | 2.2ml | 54 km WNW of Aleknagik, Alaska 59.430°, -159.521° | 12.0 km | - | - | - | ✓ Reviewed | USGS → |
On September 27, 2023 at 20:36 UTC, a magnitude 2.2 earthquake struck 54 km WNW of Aleknagik, Alaska. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-27 2023-09-27 20:29:19 UTC | 2.3ml(texnet) | 54 km S of Whites City, New Mexico 31.690°, -104.296° | 6.5 km | - | - | - | ✓ Reviewed | USGS → |
At 20:29 UTC on September 27, 2023, a magnitude 2.3 tremor occurred 54 km S of Whites City, New Mexico. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-27 2023-09-27 20:21:21 UTC | 2.7ml | 26 km NW of Stanley, Idaho 44.416°, -115.130° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.7 event was detected 26 km NW of Stanley, Idaho on September 27, 2023, with origin time 20:21 UTC. The event was offshore. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-27 2023-09-27 20:07:42 UTC | 2.8ml | 182 km S of Atka, Alaska 50.558°, -174.130° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.8 earthquake was recorded 182 km S of Atka, Alaska on September 27, 2023 at 20:07 UTC. The event was offshore. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-27 2023-09-27 20:07:05 UTC | 3.2ml | 15 km ENE of Wright, Wyoming 43.798°, -105.307° | 0.0 km | - | - | - | ✓ Reviewed | USGS → |
On September 27, 2023 at 20:07 UTC, a magnitude 3.2 earthquake struck 15 km ENE of Wright, Wyoming. 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. | ||||||||
2023-09-27 2023-09-27 20:00:21 UTC | 3.6ml | 6 km NNW of Walker, CA 38.558°, -119.512° | 4.6 km | 9 | III | - | ✓ Reviewed | USGS → |
On September 27, 2023, worldwide seismic activity registered a magnitude 3.6 earthquake 6 km NNW of Walker, CA at 20:00 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. | ||||||||
2023-09-27 2023-09-27 19:56:54 UTC | 2.4ml | 73 km E of Ugashik, Alaska 57.479°, -156.177° | 88.9 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.4 earthquake 73 km E of Ugashik, Alaska came in on September 27, 2023 at 19:56 UTC. The event was offshore. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-27 2023-09-27 19:54:48 UTC | 2.7ml | 80 km SSE of Adak, Alaska 51.167°, -176.363° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.7 earthquake 80 km SSE of Adak, Alaska came in on September 27, 2023 at 19:54 UTC. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-27 2023-09-27 19:39:34 UTC | 2.5ml(texnet) | 65 km SSW of Whites City, New Mexico 31.601°, -104.550° | 5.5 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.5 earthquake 65 km SSW of Whites City, New Mexico with origin time 19:39 UTC on September 27, 2023. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-27 2023-09-27 19:34:27 UTC | 2.3ml(texnet) | western Texas 31.641°, -104.515° | 6.4 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.3 earthquake near western Texas at 19:34 UTC on September 27, 2023. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-27 2023-09-27 19:15:38 UTC | 2.1ml | 62 km S of Sand Point, Alaska 54.788°, -160.327° | 25.6 km | - | - | - | ✓ Reviewed | USGS → |
September 27, 2023 brought a magnitude 2.1 earthquake 62 km S of Sand Point, Alaska, logged at 19:15 UTC. The event was offshore. See the M2.1 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 27, 2023. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.