Earthquakes on December 23, 2021
314
EARTHQUAKES on December 23, 2021
24-hour UTC period · USGS data
LARGEST: M4.9 — Nicobar Islands, India region
10 km deep
Elevated activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
0
M4.0–4.9
32
M3.0–3.9
11
M2.0–2.9
76
M1.0–1.9
195
Activity Summary
314
Total earthquakes
~250
Daily average
Elevated
Activity level
0
M5.0+ events
Geographic Breakdown
By US State
Significant Earthquakes (M4.5+)
4.9
Nicobar Islands, India region
22:39 UTC · 10.0 km deep
4.9
southeast of Easter Island
20:55 UTC · 10.0 km deep
4.9
118 km WSW of Sabang, Indonesia
20:03 UTC · 35.0 km deep
4.8
4 km WNW of Imzouren, Morocco
01:54 UTC · 10.0 km deep
Felt by 8
4.7
175 km SW of Sechura, Peru
23:02 UTC · 10.0 km deep
4.7
southern Mid-Atlantic Ridge
17:19 UTC · 10.0 km deep
4.7
33 km E of Port-Olry, Vanuatu
00:47 UTC · 116.5 km deep
4.6
South Sandwich Islands region
14:11 UTC · 10.0 km deep
Earthquake Map — December 23, 2021
All Earthquakes — December 23, 2021
Showing 30 of 119 (filtered from 314)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2021-12-23 2021-12-23 23:39:44 UTC | 2.2md | 11km WSW of Squaw Valley, CA 36.718°, -119.367° | 19.2 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.2 event was detected 11km WSW of Squaw Valley, CA on December 23, 2021, with origin time 23:39 UTC. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-23 2021-12-23 23:35:07 UTC | 2.6ml | 7 km E of P?hala, Hawaii 19.215°, -155.405° | 33.5 km | - | - | - | ✓ Reviewed | USGS → |
On December 23, 2021, worldwide seismic activity registered a magnitude 2.6 earthquake 7 km E of P?hala, Hawaii at 23:35 UTC. The event was offshore. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-23 2021-12-23 23:14:49 UTC | 2.8ml | 82 km SSE of Sand Point, Alaska 54.680°, -159.911° | 16.0 km | - | - | - | ✓ Reviewed | USGS → |
December 23, 2021 brought a magnitude 2.8 earthquake 82 km SSE of Sand Point, Alaska, logged at 23:14 UTC. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-23 2021-12-23 23:02:30 UTC | 4.7mb | 175 km SW of Sechura, Peru -6.459°, -82.122° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
At 23:02 UTC on December 23, 2021, a magnitude 4.7 tremor occurred 175 km SW of Sechura, Peru. The event was offshore. See the M4.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-23 2021-12-23 22:55:08 UTC | 2.2ml | 90 km SSE of Sand Point, Alaska 54.613°, -159.837° | 14.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.2 earthquake was recorded 90 km SSE of Sand Point, Alaska on December 23, 2021 at 22:55 UTC. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-23 2021-12-23 22:50:59 UTC | 2.3md | 15 km SSE of Sunnyside, Utah 39.426°, -110.308° | -2.1 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.3 earthquake 15 km SSE of Sunnyside, Utah came in on December 23, 2021 at 22:50 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-23 2021-12-23 22:39:06 UTC | 4.9mww | Nicobar Islands, India region 7.125°, 92.543° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On December 23, 2021 at 22:39 UTC, a magnitude 4.9 earthquake struck in the Nicobar Islands, India region. It is the largest earthquake currently listed for worldwide seismic activity on December 23, 2021. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-23 2021-12-23 22:34:46 UTC | 2.3ml | 11km SSW of Searles Valley, CA 35.681°, -117.469° | 6.6 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.3 earthquake 11km SSW of Searles Valley, CA with origin time 22:34 UTC on December 23, 2021. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-23 2021-12-23 22:29:00 UTC | 2.6ml | 38 km NNW of Valdez, Alaska 61.450°, -146.641° | 12.6 km | - | - | - | ✓ Reviewed | USGS → |
At 22:29 UTC on December 23, 2021, a magnitude 2.6 tremor occurred 38 km NNW of Valdez, Alaska. It arrived roughly 18 hours after a larger magnitude 3.2 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-23 2021-12-23 22:23:16 UTC | 3.0ml | 191 km ESE of Chiniak, Alaska 56.686°, -149.607° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On December 23, 2021 at 22:23 UTC, a magnitude 3.0 earthquake struck 191 km ESE of Chiniak, Alaska. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-23 2021-12-23 22:15:24 UTC | 2.1md | 5 km ENE of P?hala, Hawaii 19.219°, -155.426° | 34.5 km | - | - | - | Auto | USGS → |
On December 23, 2021 at 22:15 UTC, a magnitude 2.1 earthquake struck 5 km ENE of P?hala, Hawaii. This event falls inside the aftershock decay of a nearby magnitude 2.6 earthquake that occurred about 20 hours earlier. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-23 2021-12-23 22:13:55 UTC | 4.4mb | 18 km SSW of Gleno, Timor Leste -8.871°, 125.355° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.4 earthquake 18 km SSW of Gleno, Timor Leste at 22:13 UTC on December 23, 2021. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-23 2021-12-23 21:33:44 UTC | 4.3mb | 9 km NNE of Carlentini, Italy 37.358°, 15.059° | 10.0 km | 21 | - | - | ✓ Reviewed | USGS → |
A magnitude 4.3 earthquake was recorded 9 km NNE of Carlentini, Italy on December 23, 2021 at 21:33 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-23 2021-12-23 21:30:44 UTC | 2.1ml | 66 km ESE of Sand Point, Alaska 55.074°, -159.558° | 5.0 km | - | - | - | ✓ Reviewed | USGS → |
On December 23, 2021, worldwide seismic activity registered a magnitude 2.1 earthquake 66 km ESE of Sand Point, Alaska at 21:30 UTC. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-23 2021-12-23 21:20:23 UTC | 2.6ml | 4 km S of Houston, Alaska 61.594°, -149.808° | 18.6 km | 2 | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.6 earthquake 4 km S of Houston, Alaska at 21:20 UTC on December 23, 2021. The event was offshore. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-23 2021-12-23 21:18:41 UTC | 2.0ml | 64 km WSW of Karluk, Alaska 57.277°, -155.379° | 59.7 km | - | - | - | ✓ Reviewed | USGS → |
On December 23, 2021, worldwide seismic activity registered a magnitude 2.0 earthquake 64 km WSW of Karluk, Alaska at 21:18 UTC. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-23 2021-12-23 21:09:55 UTC | 2.2ml | 3 km SSE of P?hala, Hawaii 19.172°, -155.466° | 30.7 km | - | - | - | Auto | USGS → |
December 23, 2021 brought a magnitude 2.2 earthquake 3 km SSE of P?hala, Hawaii, logged at 21:09 UTC. Coming 19 hours after a magnitude 2.6 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-23 2021-12-23 20:55:54 UTC | 4.9mb | southeast of Easter Island -41.005°, -91.546° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.9 earthquake was recorded southeast of Easter Island on December 23, 2021 at 20:55 UTC. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-23 2021-12-23 20:54:25 UTC | 4.4mb | southeast of Easter Island -41.123°, -91.626° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.4 event was detected southeast of Easter Island on December 23, 2021, with origin time 20:54 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-23 2021-12-23 20:18:35 UTC | 2.0ml | 52 km W of Anchor Point, Alaska 59.741°, -152.762° | 90.3 km | - | - | - | ✓ Reviewed | USGS → |
At 20:18 UTC on December 23, 2021, a magnitude 2.0 tremor occurred 52 km W of Anchor Point, Alaska. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-23 2021-12-23 20:03:43 UTC | 4.9mb | 118 km WSW of Sabang, Indonesia 5.664°, 94.272° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.9 earthquake 118 km WSW of Sabang, Indonesia with origin time 20:03 UTC on December 23, 2021. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-23 2021-12-23 19:54:58 UTC | 3.0ml | 39 km SSE of False Pass, Alaska 54.508°, -163.268° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 3.0 earthquake was recorded 39 km SSE of False Pass, Alaska on December 23, 2021 at 19:54 UTC. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-23 2021-12-23 19:54:56 UTC | 2.3md | 2 km SW of Indios, Puerto Rico 17.977°, -66.840° | 17.0 km | - | - | - | ✓ Reviewed | USGS → |
On December 23, 2021 at 19:54 UTC, a magnitude 2.3 earthquake struck 2 km SW of Indios, Puerto Rico. Coming 13 hours after a magnitude 2.4 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-23 2021-12-23 19:29:28 UTC | 2.1md | 9km NNE of Petrolia, CA 40.400°, -124.255° | 25.0 km | - | - | - | ✓ Reviewed | USGS → |
At 19:29 UTC on December 23, 2021, a magnitude 2.1 tremor occurred 9km NNE of Petrolia, CA. Coming 16 hours after a magnitude 3.9 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. | ||||||||
2021-12-23 2021-12-23 19:24:00 UTC | 2.4md | 10 km NNW of Tiptonville, Tennessee 36.475°, -89.497° | 4.7 km | 2 | - | - | ✓ Reviewed | USGS → |
At 19:24 UTC on December 23, 2021, a magnitude 2.4 tremor occurred 10 km NNW of Tiptonville, Tennessee. 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. | ||||||||
2021-12-23 2021-12-23 18:57:11 UTC | 2.4md | 11km WSW of Petrolia, CA 40.274°, -124.391° | 28.6 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.4 seismic event took place 11km WSW of Petrolia, CA on December 23, 2021 at 18:57 UTC. Coming 15 hours after a magnitude 3.9 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-23 2021-12-23 18:55:48 UTC | 2.9md | 7km WSW of Petrolia, CA 40.307°, -124.364° | 29.9 km | 2 | - | - | ✓ Reviewed | USGS → |
A magnitude 2.9 seismic event took place 7km WSW of Petrolia, CA on December 23, 2021 at 18:55 UTC. It arrived roughly 15 hours after a larger magnitude 3.9 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-23 2021-12-23 18:32:59 UTC | 2.9mh | 15km NW of Petrolia, CA 40.434°, -124.383° | 27.2 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.9 earthquake 15km NW of Petrolia, CA at 18:32 UTC on December 23, 2021. It arrived roughly 15 hours after a larger magnitude 3.9 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-23 2021-12-23 18:30:14 UTC | 2.2md | 8 km E of P?hala, Hawaii 19.206°, -155.400° | 32.1 km | - | - | - | Auto | USGS → |
Reports of a magnitude 2.2 earthquake 8 km E of P?hala, Hawaii came in on December 23, 2021 at 18:30 UTC. It arrived roughly 16 hours after a larger magnitude 2.6 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. | ||||||||
2021-12-23 2021-12-23 18:04:03 UTC | 2.3md | 5 km S of P?hala, Hawaii 19.152°, -155.483° | 32.5 km | - | - | - | Auto | USGS → |
On December 23, 2021, worldwide seismic activity registered a magnitude 2.3 earthquake 5 km S of P?hala, Hawaii at 18:04 UTC. Coming 15 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 M2.3 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 23, 2021. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.