Earthquakes on December 21, 2021
341
EARTHQUAKES on December 21, 2021
24-hour UTC period · USGS data
151 km deep · 1,888 people felt it
Elevated activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
7
M4.0–4.9
38
M3.0–3.9
15
M2.0–2.9
81
M1.0–1.9
200
Activity Summary
341
Total earthquakes
~250
Daily average
Elevated
Activity level
7
M5.0+ events
Geographic Breakdown
Top Countries (International)
Significant Earthquakes (M4.5+)
5.9
58 km E of Port Alsworth, Alaska
22:42 UTC · 151.2 km deep
Felt by 1,888
5.1
Izu Islands, Japan region
16:42 UTC · 10.0 km deep
5.0
Andaman Islands, India region
21:08 UTC · 10.0 km deep
5.0
Izu Islands, Japan region
16:46 UTC · 10.0 km deep
5.0
South Atlantic Ocean
04:24 UTC · 10.0 km deep
5.0
86 km E of Sarangani, Philippines
02:55 UTC · 70.3 km deep
5.0
56 km ENE of Lakatoro, Vanuatu
01:34 UTC · 158.2 km deep
4.9
South Sandwich Islands region
08:54 UTC · 10.0 km deep
Earthquake Map — December 21, 2021
All Earthquakes — December 21, 2021
Showing 30 of 141 (filtered from 341)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2021-12-21 2021-12-21 23:08:18 UTC | 2.8md | 25km W of Petrolia, CA 40.290°, -124.577° | 19.8 km | 2 | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.8 earthquake 25km W of Petrolia, CA came in on December 21, 2021 at 23:08 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.2 earthquake that occurred about 6 hours earlier. The event was offshore. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-21 2021-12-21 22:58:48 UTC | 3.5md | 121 km NE of Punta Cana, Dominican Republic 19.484°, -67.751° | 29.0 km | - | - | - | ✓ Reviewed | USGS → |
December 21, 2021 brought a magnitude 3.5 earthquake 121 km NE of Punta Cana, Dominican Republic, logged at 22:58 UTC. The event was offshore. See the M3.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-21 2021-12-21 22:47:48 UTC | 2.4ml | 13km SE of Bodfish, CA 35.519°, -118.380° | 6.6 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.4 event was detected 13km SE of Bodfish, CA on December 21, 2021, with origin time 22:47 UTC. The event was offshore. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-21 2021-12-21 22:42:15 UTC | 5.9mww | 58 km E of Port Alsworth, Alaska 60.124°, -153.274° | 151.2 km | 1,888 | IV | green | ✓ Reviewed | USGS → |
On December 21, 2021 at 22:42 UTC, a magnitude 5.9 earthquake struck 58 km E of Port Alsworth, Alaska. A tsunami evaluation was automatically initiated given the magnitude and location. The USGS PAGER system assigned a green alert level for this event, signalling no significant casualties or damage expected. See the M5.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-21 2021-12-21 22:38:59 UTC | 2.1md | 6km NE of Bonadelle Ranchos-Madera Ranchos, CA 37.017°, -119.817° | -0.4 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.1 event was detected 6km NE of Bonadelle Ranchos-Madera Ranchos, CA on December 21, 2021, with origin time 22:38 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. | ||||||||
2021-12-21 2021-12-21 22:38:38 UTC | 2.7ml | 3km NW of Palomar Observatory, CA 33.375°, -116.880° | 4.8 km | 53 | - | - | ✓ Reviewed | USGS → |
On December 21, 2021 at 22:38 UTC, a magnitude 2.7 earthquake struck 3km NW of Palomar Observatory, CA. 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. | ||||||||
2021-12-21 2021-12-21 22:36:45 UTC | 3.6ml | 9 km E of Springdale, Utah 37.191°, -112.894° | 19.6 km | 161 | III | - | ✓ Reviewed | USGS → |
A magnitude 3.6 seismic event took place 9 km E of Springdale, Utah on December 21, 2021 at 22:36 UTC. The event was offshore. See the M3.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-21 2021-12-21 22:34:33 UTC | 2.3ml | 202 km WSW of Adak, Alaska 51.298°, -179.408° | 13.9 km | - | - | - | ✓ Reviewed | USGS → |
On December 21, 2021, worldwide seismic activity registered a magnitude 2.3 earthquake 202 km WSW of Adak, Alaska at 22:34 UTC. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-21 2021-12-21 22:34:15 UTC | 4.1mb | 29 km NW of Colonia Dora, Argentina -28.402°, -63.147° | 593.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.1 earthquake was recorded 29 km NW of Colonia Dora, Argentina on December 21, 2021 at 22:34 UTC. This is the deepest earthquake in the current dataset — a deep-focus event. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-21 2021-12-21 22:31:31 UTC | 4.4mb | Arafura Sea -8.527°, 134.904° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On December 21, 2021 at 22:31 UTC, a magnitude 4.4 earthquake struck near Arafura Sea. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-21 2021-12-21 22:04:09 UTC | 4.3mb | 248 km NNE of Tobelo, Indonesia 3.892°, 128.622° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.3 earthquake 248 km NNE of Tobelo, Indonesia came in on December 21, 2021 at 22:04 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-21 2021-12-21 22:03:32 UTC | 2.1ml | 3km NNW of Palomar Observatory, CA 33.377°, -116.879° | 4.9 km | - | - | - | ✓ Reviewed | USGS → |
On December 21, 2021, worldwide seismic activity registered a magnitude 2.1 earthquake 3km NNW of Palomar Observatory, CA at 22:03 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. | ||||||||
2021-12-21 2021-12-21 21:46:46 UTC | 2.5ml | 23 km NW of Stanley, Idaho 44.368°, -115.153° | 10.0 km | 1 | - | - | ✓ Reviewed | USGS → |
December 21, 2021 brought a magnitude 2.5 earthquake 23 km NW of Stanley, Idaho, logged at 21:46 UTC. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-21 2021-12-21 21:37:02 UTC | 2.1md | 5 km SE of Maria Antonia, Puerto Rico 17.947°, -66.846° | 13.0 km | - | - | - | ✓ Reviewed | USGS → |
At 21:37 UTC on December 21, 2021, a magnitude 2.1 tremor occurred 5 km SE of Maria Antonia, Puerto Rico. Coming 14 hours after a magnitude 2.7 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-21 2021-12-21 21:35:37 UTC | 2.8md | 38km WNW of Petrolia, CA 40.395°, -124.721° | 22.0 km | - | - | - | ✓ Reviewed | USGS → |
At 21:35 UTC on December 21, 2021, a magnitude 2.8 tremor occurred 38km WNW of Petrolia, CA. This event falls inside the aftershock decay of a nearby magnitude 3.2 earthquake that occurred about 4 hours earlier. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-21 2021-12-21 21:22:23 UTC | 2.3ml | 9 km ENE of Big Lake, Alaska 61.543°, -149.779° | 51.3 km | 4 | - | - | ✓ Reviewed | USGS → |
At 21:22 UTC on December 21, 2021, a magnitude 2.3 tremor occurred 9 km ENE of Big Lake, Alaska. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-21 2021-12-21 21:18:02 UTC | 2.5ml | 19 km SW of Falls City, Texas 28.853°, -98.160° | 5.4 km | - | - | - | ✓ Reviewed | USGS → |
On December 21, 2021 at 21:18 UTC, a magnitude 2.5 earthquake struck 19 km SW of Falls City, Texas. It arrived roughly 1 hours after a larger magnitude 3.0 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-21 2021-12-21 21:14:00 UTC | 2.1md | 2 km SE of Palomas, Puerto Rico 17.994°, -66.858° | 9.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.1 earthquake 2 km SE of Palomas, Puerto Rico with origin time 21:14 UTC on December 21, 2021. It arrived roughly 14 hours after a larger magnitude 2.7 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. | ||||||||
2021-12-21 2021-12-21 21:10:34 UTC | 2.3ml | 2 km SE of P?hala, Hawaii 19.186°, -155.456° | 37.8 km | - | - | - | Auto | USGS → |
A magnitude 2.3 earthquake was recorded 2 km SE of P?hala, Hawaii on December 21, 2021 at 21:10 UTC. Coming 12 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. | ||||||||
2021-12-21 2021-12-21 21:08:33 UTC | 5.0mb | Andaman Islands, India region 10.299°, 94.042° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 5.0 earthquake in the Andaman Islands, India region with origin time 21:08 UTC on December 21, 2021. See the M5.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-21 2021-12-21 21:01:40 UTC | 3.2ml | 20 km SE of Wright, Wyoming 43.613°, -105.319° | 0.0 km | - | - | - | ✓ Reviewed | USGS → |
On December 21, 2021, worldwide seismic activity registered a magnitude 3.2 earthquake 20 km SE of Wright, Wyoming at 21:01 UTC. 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. | ||||||||
2021-12-21 2021-12-21 21:00:51 UTC | 2.3ml | 8 km ENE of P?hala, Hawaii 19.232°, -155.401° | 31.8 km | - | - | - | Auto | USGS → |
Seismographs logged a magnitude 2.3 earthquake 8 km ENE of P?hala, Hawaii with origin time 21:00 UTC on December 21, 2021. This event falls inside the aftershock decay of a nearby magnitude 2.4 earthquake that occurred about 12 hours earlier. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-21 2021-12-21 20:55:52 UTC | 2.8ml | 43 km SSE of False Pass, Alaska 54.481°, -163.230° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.8 seismic event took place 43 km SSE of False Pass, Alaska on December 21, 2021 at 20:55 UTC. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-21 2021-12-21 20:50:35 UTC | 2.3ml | 16 km SSE of Sunnyside, Utah 39.419°, -110.296° | -3.2 km | - | - | - | ✓ Reviewed | USGS → |
December 21, 2021 brought a magnitude 2.3 earthquake 16 km SSE of Sunnyside, Utah, logged at 20:50 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. | ||||||||
2021-12-21 2021-12-21 20:33:59 UTC | 3.7md | 24 km SE of Boca de Yuma, Dominican Republic 18.238°, -68.432° | 111.0 km | 1 | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 3.7 earthquake 24 km SE of Boca de Yuma, Dominican Republic came in on December 21, 2021 at 20:33 UTC. The event was offshore. See the M3.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-21 2021-12-21 20:13:38 UTC | 4.7mb | southern East Pacific Rise -55.514°, -124.775° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.7 event was detected near southern East Pacific Rise on December 21, 2021, with origin time 20:13 UTC. See the M4.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-21 2021-12-21 20:12:30 UTC | 2.3ml | 63 km ESE of Nikolski, Alaska 52.731°, -167.979° | 21.5 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.3 earthquake 63 km ESE of Nikolski, Alaska at 20:12 UTC on December 21, 2021. It arrived roughly 3 hours after a larger magnitude 4.3 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-21 2021-12-21 20:10:30 UTC | 4.3mb | 150 km N of Tobelo, Indonesia 3.087°, 128.041° | 109.6 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.3 seismic event took place 150 km N of Tobelo, Indonesia on December 21, 2021 at 20:10 UTC. The event was offshore. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-21 2021-12-21 20:03:16 UTC | 3.1ml | 3km E of Covelo, CA 39.798°, -123.213° | -1.2 km | 11 | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 3.1 earthquake 3km E of Covelo, CA came in on December 21, 2021 at 20:03 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M3.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-21 2021-12-21 19:57:50 UTC | 3.0ml | 19 km SW of Falls City, Texas 28.857°, -98.158° | 4.7 km | 2 | - | - | ✓ Reviewed | USGS → |
A magnitude 3.0 seismic event took place 19 km SW of Falls City, Texas on December 21, 2021 at 19:57 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. 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, 2021. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.