Earthquakes on December 21, 2023
269
EARTHQUAKES on December 21, 2023
24-hour UTC period · USGS data
LARGEST: M6.1 — 116 km SE of Adak, Alaska
20 km deep · 3 people felt it
Normal activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
5
M4.0–4.9
38
M3.0–3.9
13
M2.0–2.9
56
M1.0–1.9
157
Activity Summary
269
Total earthquakes
~250
Daily average
Normal
Activity level
5
M5.0+ events
Geographic Breakdown
By US State
Significant Earthquakes (M4.5+)
6.1
116 km SE of Adak, Alaska
14:55 UTC · 20.0 km deep
Felt by 3
5.6
21 km N of Tocopilla, Chile
16:21 UTC · 61.7 km deep
Felt by 21
5.2
56 km E of Ōhara, Japan
14:04 UTC · 10.0 km deep
Felt by 10
5.0
50 km E of Ōhara, Japan
20:45 UTC · 13.2 km deep
5.0
11 km SSW of San Fernando, Peru
11:36 UTC · 13.9 km deep
Felt by 2
4.8
66 km E of Ōhara, Japan
16:11 UTC · 21.0 km deep
4.8
43 km ESE of Ōhara, Japan
15:02 UTC · 27.3 km deep
4.7
82 km N of Gorontalo, Indonesia
21:11 UTC · 70.0 km deep
Earthquake Map — December 21, 2023
All Earthquakes — December 21, 2023
Showing 30 of 112 (filtered from 269)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2023-12-21 2023-12-21 23:32:31 UTC | 2.7ml | 107 km SE of Adak, Alaska 51.301°, -175.386° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
December 21, 2023 brought a magnitude 2.7 earthquake 107 km SE of Adak, Alaska, logged at 23:32 UTC. It arrived roughly 9 hours after a larger magnitude 6.1 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-12-21 2023-12-21 23:10:44 UTC | 4.0mb | 61 km S of Muara Bungo, Indonesia -2.043°, 102.159° | 214.7 km | - | - | - | ✓ Reviewed | USGS → |
On December 21, 2023 at 23:10 UTC, a magnitude 4.0 earthquake struck 61 km S of Muara Bungo, Indonesia. The event was offshore. See the M4.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-12-21 2023-12-21 23:02:27 UTC | 2.2ml | 56 km ESE of St. Michael, Alaska 63.356°, -160.948° | 19.1 km | - | - | - | ✓ Reviewed | USGS → |
On December 21, 2023, worldwide seismic activity registered a magnitude 2.2 earthquake 56 km ESE of St. Michael, Alaska at 23:02 UTC. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-12-21 2023-12-21 23:00:48 UTC | 3.6ml | 116 km SE of Adak, Alaska 51.206°, -175.346° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
On December 21, 2023, worldwide seismic activity registered a magnitude 3.6 earthquake 116 km SE of Adak, Alaska at 23:00 UTC. This event falls inside the aftershock decay of a nearby magnitude 6.1 earthquake that occurred about 8 hours earlier. The event was offshore. See the M3.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-12-21 2023-12-21 22:43:15 UTC | 2.2ml | 110 km SSE of Chenega, Alaska 59.218°, -146.988° | 3.9 km | - | - | - | ✓ Reviewed | USGS → |
At 22:43 UTC on December 21, 2023, a magnitude 2.2 tremor occurred 110 km SSE of Chenega, Alaska. 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. | ||||||||
2023-12-21 2023-12-21 22:40:51 UTC | 4.3mb | Kepulauan Babar, Indonesia -7.072°, 129.702° | 124.1 km | - | - | - | ✓ Reviewed | USGS → |
On December 21, 2023, worldwide seismic activity registered a magnitude 4.3 earthquake near Kepulauan Babar, Indonesia at 22:40 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-12-21 2023-12-21 22:14:19 UTC | 3.4ml | 58 km NW of Ninilchik, Alaska 60.418°, -152.415° | 94.0 km | 1 | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 3.4 earthquake 58 km NW of Ninilchik, Alaska at 22:14 UTC on December 21, 2023. The event was offshore. See the M3.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-12-21 2023-12-21 21:56:51 UTC | 3.5ml | 13 km SE of Wright, Wyoming 43.671°, -105.370° | 0.0 km | - | - | - | ✓ Reviewed | USGS → |
At 21:56 UTC on December 21, 2023, a magnitude 3.5 tremor occurred 13 km SE of Wright, Wyoming. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M3.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-12-21 2023-12-21 21:48:06 UTC | 3.3ml | 128 km SE of Adak, Alaska 51.132°, -175.214° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 3.3 event was detected 128 km SE of Adak, Alaska on December 21, 2023, with origin time 21:48 UTC. This event falls inside the aftershock decay of a nearby magnitude 6.1 earthquake that occurred about 7 hours earlier. The event was offshore. See the M3.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-12-21 2023-12-21 21:40:44 UTC | 2.9ml | 34 km SE of Mina, Nevada 38.169°, -117.835° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.9 event was detected 34 km SE of Mina, Nevada on December 21, 2023, with origin time 21:40 UTC. The event was offshore. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-12-21 2023-12-21 21:38:58 UTC | 4.4mb | 88 km ENE of Tadine, New Caledonia -21.155°, 168.629° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On December 21, 2023 at 21:38 UTC, a magnitude 4.4 earthquake struck 88 km ENE of Tadine, New Caledonia. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-12-21 2023-12-21 21:29:27 UTC | 3.2ml | 48 km SW of Primo Tapia, B.C., MX 31.904°, -117.258° | 21.7 km | 1 | - | - | ✓ Reviewed | USGS → |
December 21, 2023 brought a magnitude 3.2 earthquake 48 km SW of Primo Tapia, B.C., MX, logged at 21:29 UTC. The event was offshore. See the M3.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-12-21 2023-12-21 21:20:17 UTC | 4.2mb | 94 km E of Aras-asan, Philippines 8.903°, 127.169° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.2 earthquake was recorded 94 km E of Aras-asan, Philippines on December 21, 2023 at 21:20 UTC. This event falls inside the aftershock decay of a nearby magnitude 4.6 earthquake that occurred about 4 hours earlier. The event was offshore. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-12-21 2023-12-21 21:16:25 UTC | 2.5md | 2 km W of Round Valley, CA 37.418°, -118.623° | 9.3 km | - | - | - | ✓ Reviewed | USGS → |
On December 21, 2023 at 21:16 UTC, a magnitude 2.5 earthquake struck 2 km W of Round Valley, CA. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-12-21 2023-12-21 21:11:02 UTC | 4.7mb | 82 km N of Gorontalo, Indonesia 1.282°, 123.142° | 70.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.7 earthquake 82 km N of Gorontalo, Indonesia came in on December 21, 2023 at 21:11 UTC. The event was offshore. See the M4.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-12-21 2023-12-21 21:03:52 UTC | 2.6md | 5 km SSE of Salinas, Puerto Rico 17.927°, -66.283° | 14.0 km | - | - | - | ✓ Reviewed | USGS → |
On December 21, 2023, worldwide seismic activity registered a magnitude 2.6 earthquake 5 km SSE of Salinas, Puerto Rico at 21:03 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.9 earthquake that occurred about 14 hours earlier. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-12-21 2023-12-21 20:45:23 UTC | 5.0mww | 50 km E of Ōhara, Japan 35.205°, 140.942° | 13.2 km | - | - | - | ✓ Reviewed | USGS → |
On December 21, 2023, worldwide seismic activity registered a magnitude 5.0 earthquake 50 km E of Ōhara, Japan at 20:45 UTC. It arrived roughly 7 hours after a larger magnitude 5.2 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M5.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-12-21 2023-12-21 19:46:53 UTC | 2.6ml | 41 km E of Port Alsworth, Alaska 60.240°, -153.579° | 177.8 km | - | - | - | ✓ Reviewed | USGS → |
At 19:46 UTC on December 21, 2023, a magnitude 2.6 tremor occurred 41 km E of Port Alsworth, Alaska. Coming 4 hours after a magnitude 3.1 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. | ||||||||
2023-12-21 2023-12-21 19:45:14 UTC | 2.1ml | 114 km NW of Yakutat, Alaska 60.234°, -141.248° | 14.1 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.1 earthquake 114 km NW of Yakutat, Alaska with origin time 19:45 UTC on December 21, 2023. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-12-21 2023-12-21 19:40:07 UTC | 2.8md | 5 km SSE of Salinas, Puerto Rico 17.936°, -66.277° | 7.8 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.8 earthquake 5 km SSE of Salinas, Puerto Rico came in on December 21, 2023 at 19:40 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.9 earthquake that occurred about 13 hours earlier. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-12-21 2023-12-21 19:30:59 UTC | 4.5mb | 111 km ENE of Barcelona, Philippines 8.572°, 127.360° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.5 earthquake 111 km ENE of Barcelona, Philippines at 19:30 UTC on December 21, 2023. It arrived roughly 10 hours after a larger magnitude 4.6 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-12-21 2023-12-21 19:28:29 UTC | 4.7mwr | 120 km SE of Adak, Alaska 51.227°, -175.232° | 29.3 km | - | II | - | ✓ Reviewed | USGS → |
A magnitude 4.7 seismic event took place 120 km SE of Adak, Alaska on December 21, 2023 at 19:28 UTC. Coming 5 hours after a magnitude 6.1 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M4.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-12-21 2023-12-21 19:09:16 UTC | 2.1ml | 79 km NNW of Emmonak, Alaska 63.479°, -164.852° | 16.0 km | - | - | - | ✓ Reviewed | USGS → |
On December 21, 2023, worldwide seismic activity registered a magnitude 2.1 earthquake 79 km NNW of Emmonak, Alaska at 19:09 UTC. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-12-21 2023-12-21 19:09:04 UTC | 4.2mwr | 23 km SW of Ovalle, Chile -30.743°, -71.379° | 49.8 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.2 earthquake 23 km SW of Ovalle, Chile with origin time 19:09 UTC on December 21, 2023. The event was offshore. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-12-21 2023-12-21 19:06:00 UTC | 4.5mb | south of the Fiji Islands -26.762°, -176.477° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.5 event was detected south of the Fiji Islands on December 21, 2023, with origin time 19:06 UTC. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-12-21 2023-12-21 18:36:32 UTC | 4.3mb | 60 km SSE of Hasaki, Japan 35.245°, 141.135° | 29.1 km | - | - | - | ✓ Reviewed | USGS → |
At 18:36 UTC on December 21, 2023, a magnitude 4.3 tremor occurred 60 km SSE of Hasaki, Japan. It arrived roughly 5 hours after a larger magnitude 5.2 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-12-21 2023-12-21 18:24:33 UTC | 4.2mb | 1 km NNW of Anayazı, Turkey 36.334°, 36.184° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On December 21, 2023, worldwide seismic activity registered a magnitude 4.2 earthquake 1 km NNW of Anayazı, Turkey at 18:24 UTC. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-12-21 2023-12-21 18:11:39 UTC | 2.2ml | 16 km S of Princeton, Canada 49.312°, -120.471° | -0.5 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.2 earthquake 16 km S of Princeton, Canada came in on December 21, 2023 at 18:11 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. | ||||||||
2023-12-21 2023-12-21 17:35:11 UTC | 4.5mb | Pacific-Antarctic Ridge -55.243°, -128.869° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.5 earthquake near Pacific-Antarctic Ridge came in on December 21, 2023 at 17:35 UTC. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-12-21 2023-12-21 17:33:55 UTC | 3.0ml | 114 km SE of Adak, Alaska 51.209°, -175.377° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
At 17:33 UTC on December 21, 2023, a magnitude 3.0 tremor occurred 114 km SE of Adak, Alaska. It arrived roughly 3 hours after a larger magnitude 6.1 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M3.0 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 December 21, 2023. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.