Earthquakes on September 21, 2023
282
EARTHQUAKES on September 21, 2023
24-hour UTC period · USGS data
LARGEST: M6.1 — Vanuatu
185 km deep · 2 people felt it
Normal activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
5
M4.0–4.9
32
M3.0–3.9
3
M2.0–2.9
54
M1.0–1.9
188
Activity Summary
282
Total earthquakes
~250
Daily average
Normal
Activity level
5
M5.0+ events
Geographic Breakdown
By US State
Top Countries (International)
Significant Earthquakes (M4.5+)
6.1
Vanuatu
21:11 UTC · 185.0 km deep
Felt by 2
5.7
Izu Islands, Japan region
21:22 UTC · 12.8 km deep
5.6
Kermadec Islands, New Zealand
15:20 UTC · 34.0 km deep
5.4
47 km S of Sand Point, Alaska
01:13 UTC · 50.3 km deep
Felt by 4
5.0
36 km NNW of Dededo Village, Guam
09:48 UTC · 151.9 km deep
Felt by 33
4.7
eastern Greenland
22:41 UTC · 10.0 km deep
4.6
88 km S of Baubau, Indonesia
18:23 UTC · 10.4 km deep
4.6
75 km ESE of Teluk Dalam, Indonesia
04:07 UTC · 29.4 km deep
Earthquake Map — September 21, 2023
All Earthquakes — September 21, 2023
Showing 30 of 94 (filtered from 282)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2023-09-21 2023-09-21 23:42:02 UTC | 2.1ml | 10 km WNW of Longbranch, Washington 47.235°, -122.890° | 48.8 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.1 earthquake 10 km WNW of Longbranch, Washington at 23:42 UTC on September 21, 2023. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-21 2023-09-21 23:29:44 UTC | 4.4mb | Izu Islands, Japan region 30.940°, 142.003° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
At 23:29 UTC on September 21, 2023, a magnitude 4.4 tremor occurred in the Izu Islands, Japan region. Coming 2 hours after a magnitude 5.7 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-21 2023-09-21 22:49:19 UTC | 4.4mwr | Potosi, Bolivia -21.820°, -67.191° | 194.5 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.4 earthquake near Potosi, Bolivia at 22:49 UTC on September 21, 2023. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-21 2023-09-21 22:41:40 UTC | 4.7mb | eastern Greenland 79.585°, -18.464° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.7 earthquake near eastern Greenland at 22:41 UTC on September 21, 2023. See the M4.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-21 2023-09-21 22:17:27 UTC | 2.1md | 3 km NW of Hydesville, CA 40.568°, -124.122° | 21.6 km | - | - | - | ✓ Reviewed | USGS → |
September 21, 2023 brought a magnitude 2.1 earthquake 3 km NW of Hydesville, CA, logged at 22:17 UTC. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-21 2023-09-21 21:39:56 UTC | 4.3mb | Izu Islands, Japan region 31.106°, 142.300° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.3 earthquake in the Izu Islands, Japan region came in on September 21, 2023 at 21:39 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-21 2023-09-21 21:29:07 UTC | 3.0ml | 8 km WNW of Velma, Oklahoma 34.480°, -97.768° | 6.6 km | 3 | - | - | ✓ Reviewed | USGS → |
A magnitude 3.0 earthquake was recorded 8 km WNW of Velma, Oklahoma on September 21, 2023 at 21:29 UTC. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-21 2023-09-21 21:26:10 UTC | 2.3ml | 12 km E of Yucaipa, CA 34.031°, -116.912° | 14.1 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.3 event was detected 12 km E of Yucaipa, CA on September 21, 2023, with origin time 21:26 UTC. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-21 2023-09-21 21:22:12 UTC | 5.7mww | Izu Islands, Japan region 30.966°, 141.801° | 12.8 km | - | III | green | ✓ Reviewed | USGS → |
A magnitude 5.7 earthquake was recorded in the Izu Islands, Japan region on September 21, 2023 at 21:22 UTC. 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. | ||||||||
2023-09-21 2023-09-21 21:16:25 UTC | 2.4ml | 3 km S of Princeton, Canada 49.430°, -120.510° | -0.5 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.4 earthquake 3 km S of Princeton, Canada came in on September 21, 2023 at 21:16 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. | ||||||||
2023-09-21 2023-09-21 21:14:24 UTC | 2.2ml(texnet) | 49 km NW of Toyah, Texas 31.596°, -104.197° | 6.1 km | - | - | - | ✓ Reviewed | USGS → |
September 21, 2023 brought a magnitude 2.2 earthquake 49 km NW of Toyah, Texas, logged at 21:14 UTC. It arrived roughly 18 hours after a larger magnitude 2.5 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-21 2023-09-21 21:11:48 UTC | 6.1mww | Vanuatu -14.019°, 167.247° | 185.0 km | 2 | IV | green | ✓ Reviewed | USGS → |
On September 21, 2023 at 21:11 UTC, a magnitude 6.1 earthquake struck near Vanuatu. 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 21, 2023. See the M6.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-21 2023-09-21 20:56:07 UTC | 4.4mb | Kermadec Islands, New Zealand -29.906°, -177.373° | 33.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.4 event was detected near Kermadec Islands, New Zealand on September 21, 2023, with origin time 20:56 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-21 2023-09-21 19:58:12 UTC | 4.0mb | 31 km E of Meulaboh, Indonesia 4.158°, 96.412° | 10.6 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.0 earthquake 31 km E of Meulaboh, Indonesia at 19:58 UTC on September 21, 2023. The event was offshore. See the M4.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-21 2023-09-21 19:57:42 UTC | 2.4md | 1 km NE of Valley Ranch, CA 39.743°, -120.563° | 3.4 km | - | - | - | ✓ Reviewed | USGS → |
At 19:57 UTC on September 21, 2023, a magnitude 2.4 tremor occurred 1 km NE of Valley Ranch, CA. 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. | ||||||||
2023-09-21 2023-09-21 19:35:48 UTC | 2.5ml(texnet) | 32 km SE of Malaga, New Mexico 32.008°, -103.842° | 5.9 km | - | - | - | ✓ Reviewed | USGS → |
On September 21, 2023 at 19:35 UTC, a magnitude 2.5 earthquake struck 32 km SE of Malaga, New Mexico. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-21 2023-09-21 19:26:18 UTC | 4.3mb | Pagan region, Northern Mariana Islands 18.571°, 146.628° | 65.8 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.3 seismic event took place in the Pagan region, Northern Mariana Islands on September 21, 2023 at 19:26 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-21 2023-09-21 19:17:47 UTC | 2.1ml | 32 km NE of Pedro Bay, Alaska 59.959°, -153.645° | 162.6 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.1 event was detected 32 km NE of Pedro Bay, Alaska on September 21, 2023, with origin time 19:17 UTC. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-21 2023-09-21 19:12:59 UTC | 2.0ml | Ohio 41.798°, -81.067° | 5.0 km | 9 | - | - | ✓ Reviewed | USGS → |
This magnitude 2.0 event was detected near Ohio on September 21, 2023, with origin time 19:12 UTC. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-21 2023-09-21 19:11:32 UTC | 4.1mb | south of the Kermadec Islands -32.037°, -178.454° | 36.6 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.1 earthquake south of the Kermadec Islands with origin time 19:11 UTC on September 21, 2023. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-21 2023-09-21 18:41:56 UTC | 4.2mb | 4 km SE of Abasolo del Valle, Mexico 17.754°, -95.518° | 107.6 km | - | - | - | ✓ Reviewed | USGS → |
On September 21, 2023 at 18:41 UTC, a magnitude 4.2 earthquake struck 4 km SE of Abasolo del Valle, Mexico. The event was offshore. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-21 2023-09-21 18:41:18 UTC | 2.1ml | 62 km W of Happy Valley, Alaska 60.023°, -152.838° | 89.6 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.1 earthquake 62 km W of Happy Valley, Alaska came in on September 21, 2023 at 18:41 UTC. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-21 2023-09-21 18:32:32 UTC | 2.3ml | 10 km NE of Pāhala, Hawaii 19.267°, -155.402° | 30.2 km | - | - | - | Auto | USGS → |
A magnitude 2.3 seismic event took place 10 km NE of Pāhala, Hawaii on September 21, 2023 at 18:32 UTC. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-21 2023-09-21 18:23:22 UTC | 4.6mb | 88 km S of Baubau, Indonesia -6.258°, 122.647° | 10.4 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.6 event was detected 88 km S of Baubau, Indonesia on September 21, 2023, with origin time 18:23 UTC. The event was offshore. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-21 2023-09-21 18:20:22 UTC | 2.1ml | 16 km E of Willow, Alaska 61.772°, -149.734° | 20.6 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.1 seismic event took place 16 km E of Willow, Alaska on September 21, 2023 at 18:20 UTC. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-21 2023-09-21 18:13:37 UTC | 4.4mb | 182 km WSW of Bandar Lampung, Indonesia -6.256°, 103.836° | 39.1 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.4 earthquake 182 km WSW of Bandar Lampung, Indonesia came in on September 21, 2023 at 18:13 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-21 2023-09-21 17:29:24 UTC | 2.0ml | 45 km ENE of Lake Minchumina, Alaska 64.066°, -151.492° | 23.2 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.0 earthquake 45 km ENE of Lake Minchumina, Alaska came in on September 21, 2023 at 17:29 UTC. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-21 2023-09-21 17:27:48 UTC | 2.2ml(texnet) | 8 km NE of Hermleigh, Texas 32.696°, -100.698° | 5.2 km | - | - | - | ✓ Reviewed | USGS → |
On September 21, 2023 at 17:27 UTC, a magnitude 2.2 earthquake struck 8 km NE of Hermleigh, Texas. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-21 2023-09-21 17:19:47 UTC | 2.0ml | 92 km ENE of Ouzinkie, Alaska 58.333°, -151.127° | 19.4 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.0 seismic event took place 92 km ENE of Ouzinkie, Alaska on September 21, 2023 at 17:19 UTC. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-21 2023-09-21 17:12:55 UTC | 2.5ml | 85 km S of False Pass, Alaska 54.084°, -163.468° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.5 earthquake was recorded 85 km S of False Pass, Alaska on September 21, 2023 at 17:12 UTC. The event was offshore. See the M2.5 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 21, 2023. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.