Earthquakes on December 9, 2021
320
EARTHQUAKES on December 9, 2021
24-hour UTC period · USGS data
LARGEST: M6.0 — 116 km N of Naze, Japan
7 km deep · 14 people felt it
Elevated activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
5
M4.0–4.9
54
M3.0–3.9
31
M2.0–2.9
55
M1.0–1.9
175
Activity Summary
320
Total earthquakes
~250
Daily average
Elevated
Activity level
5
M5.0+ events
Geographic Breakdown
Top Countries (International)
Significant Earthquakes (M4.5+)
6.0
116 km N of Naze, Japan
02:05 UTC · 7.0 km deep
Felt by 14
5.7
79 km S of Kokopo, Papua New Guinea
13:52 UTC · 34.0 km deep
Felt by 4
5.4
off the coast of Oregon
23:32 UTC · 10.0 km deep
Felt by 1
5.2
off the coast of Oregon
21:08 UTC · 10.0 km deep
Felt by 5
5.1
256 km S of ‘Ohonua, Tonga
22:09 UTC · 10.0 km deep
4.9
9 km E of Santa Monica, Philippines
12:44 UTC · 35.0 km deep
4.8
7 km NNE of Cepitá, Colombia
23:14 UTC · 153.4 km deep
Felt by 1
4.8
off the coast of Oregon
15:05 UTC · 10.0 km deep
Earthquake Map — December 9, 2021
All Earthquakes — December 9, 2021
Showing 30 of 145 (filtered from 320)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2021-12-09 2021-12-09 23:49:27 UTC | 4.2mb | 273 km WSW of Adak, Alaska 51.105°, 179.621° | 25.1 km | - | II | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.2 earthquake 273 km WSW of Adak, Alaska at 23:49 UTC on December 9, 2021. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-09 2021-12-09 23:46:54 UTC | 3.8mb | off the coast of Oregon 44.182°, -129.188° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On December 9, 2021 at 23:46 UTC, a magnitude 3.8 earthquake struck near off the coast of Oregon. It arrived roughly 9 hours after a larger magnitude 4.8 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M3.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-09 2021-12-09 23:42:39 UTC | 2.1ml | 19 km NW of Fox River, Alaska 59.970°, -151.219° | 45.5 km | - | - | - | ✓ Reviewed | USGS → |
At 23:42 UTC on December 9, 2021, a magnitude 2.1 tremor occurred 19 km NW of Fox River, Alaska. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-09 2021-12-09 23:32:16 UTC | 5.4mww | off the coast of Oregon 44.163°, -129.519° | 10.0 km | 1 | - | green | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 5.4 earthquake near off the coast of Oregon with origin time 23:32 UTC on December 9, 2021. 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 M5.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-09 2021-12-09 23:25:06 UTC | 2.0ml | 55 km S of Whites City, New Mexico 31.683°, -104.460° | 6.6 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.0 earthquake 55 km S of Whites City, New Mexico with origin time 23:25 UTC on December 9, 2021. This event falls inside the aftershock decay of a nearby magnitude 3.1 earthquake that occurred about 7 hours earlier. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-09 2021-12-09 23:22:15 UTC | 2.6ml | 6 km E of P?hala, Hawaii 19.212°, -155.419° | 33.4 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.6 earthquake was recorded 6 km E of P?hala, Hawaii on December 9, 2021 at 23:22 UTC. Coming 12 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 M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-09 2021-12-09 23:14:40 UTC | 4.8mb | 7 km NNE of Cepitá, Colombia 6.815°, -72.949° | 153.4 km | 1 | - | - | ✓ Reviewed | USGS → |
This magnitude 4.8 event was detected 7 km NNE of Cepitá, Colombia on December 9, 2021, with origin time 23:14 UTC. See the M4.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-09 2021-12-09 23:07:36 UTC | 4.4mb | 109 km SSE of Kencong, Indonesia -9.251°, 113.578° | 46.4 km | - | - | - | ✓ Reviewed | USGS → |
On December 9, 2021 at 23:07 UTC, a magnitude 4.4 earthquake struck 109 km SSE of Kencong, Indonesia. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-09 2021-12-09 22:53:08 UTC | 2.0md | 3 km SSE of La Parguera, Puerto Rico 17.945°, -67.029° | 13.0 km | 1 | - | - | ✓ Reviewed | USGS → |
A magnitude 2.0 earthquake was recorded 3 km SSE of La Parguera, Puerto Rico on December 9, 2021 at 22:53 UTC. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-09 2021-12-09 22:37:48 UTC | 4.4mb | 160 km N of The Valley, Anguilla 19.645°, -63.334° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.4 earthquake was recorded 160 km N of The Valley, Anguilla on December 9, 2021 at 22:37 UTC. The event was offshore. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-09 2021-12-09 22:36:40 UTC | 2.6ml | Rat Islands, Aleutian Islands, Alaska 52.053°, 178.420° | 6.5 km | - | - | - | ✓ Reviewed | USGS → |
On December 9, 2021 at 22:36 UTC, a magnitude 2.6 earthquake struck near Rat Islands, Aleutian Islands, Alaska. This event falls inside the aftershock decay of a nearby magnitude 4.3 earthquake that occurred about 3 hours earlier. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-09 2021-12-09 22:32:33 UTC | 3.4md | 15 km SW of San Rafael del Yuma, Dominican Republic 18.333°, -68.778° | 94.0 km | 1 | - | - | ✓ Reviewed | USGS → |
A magnitude 3.4 seismic event took place 15 km SW of San Rafael del Yuma, Dominican Republic on December 9, 2021 at 22:32 UTC. The event was offshore. See the M3.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-09 2021-12-09 22:15:59 UTC | 3.0ml | Rat Islands, Aleutian Islands, Alaska 52.044°, 178.378° | 2.8 km | - | - | - | ✓ Reviewed | USGS → |
On December 9, 2021 at 22:15 UTC, a magnitude 3.0 earthquake struck near Rat Islands, Aleutian Islands, Alaska. 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. 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. | ||||||||
2021-12-09 2021-12-09 22:15:57 UTC | 3.2ml | Alaska, United States 52.041°, 178.245° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 3.2 earthquake near Alaska, United States with origin time 22:15 UTC on December 9, 2021. This event falls inside the aftershock decay of a nearby magnitude 4.3 earthquake that occurred about 3 hours earlier. See the M3.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-09 2021-12-09 22:09:40 UTC | 5.1mb | 256 km S of ‘Ohonua, Tonga -23.629°, -175.266° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
At 22:09 UTC on December 9, 2021, a magnitude 5.1 tremor occurred 256 km S of ‘Ohonua, Tonga. The event was offshore. See the M5.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-09 2021-12-09 22:06:32 UTC | 3.3ml | Rat Islands, Aleutian Islands, Alaska 52.011°, 178.240° | 5.9 km | - | - | - | ✓ Reviewed | USGS → |
On December 9, 2021 at 22:06 UTC, a magnitude 3.3 earthquake struck near Rat Islands, Aleutian Islands, Alaska. Coming 3 hours after a magnitude 4.3 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M3.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-09 2021-12-09 21:56:27 UTC | 2.5ml | 34 km NW of Stanley, Idaho 44.460°, -115.214° | 10.0 km | 1 | - | - | ✓ Reviewed | USGS → |
A magnitude 2.5 seismic event took place 34 km NW of Stanley, Idaho on December 9, 2021 at 21:56 UTC. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-09 2021-12-09 21:55:23 UTC | 3.3ml | Rat Islands, Aleutian Islands, Alaska 51.950°, 178.260° | 10.9 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 3.3 earthquake was recorded near Rat Islands, Aleutian Islands, Alaska on December 9, 2021 at 21:55 UTC. 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 M3.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-09 2021-12-09 21:40:40 UTC | 4.3mb | 64 km NE of Santa Rosa, Peru -10.480°, -74.495° | 125.8 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.3 seismic event took place 64 km NE of Santa Rosa, Peru on December 9, 2021 at 21:40 UTC. The event was offshore. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-09 2021-12-09 21:37:33 UTC | 4.0mb | 6 km ESE of Polkowice, Poland 51.477°, 16.151° | 5.0 km | 7 | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.0 earthquake 6 km ESE of Polkowice, Poland came in on December 9, 2021 at 21:37 UTC. See the M4.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-09 2021-12-09 21:16:38 UTC | 2.6ml | Rat Islands, Aleutian Islands, Alaska 52.022°, 178.362° | 13.7 km | - | - | - | ✓ Reviewed | USGS → |
On December 9, 2021, worldwide seismic activity registered a magnitude 2.6 earthquake near Rat Islands, Aleutian Islands, Alaska at 21:16 UTC. This event falls inside the aftershock decay of a nearby magnitude 4.3 earthquake that occurred about 2 hours earlier. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-09 2021-12-09 21:08:55 UTC | 5.2mww | off the coast of Oregon 44.143°, -129.595° | 10.0 km | 5 | - | - | ✓ Reviewed | USGS → |
On December 9, 2021, worldwide seismic activity registered a magnitude 5.2 earthquake near off the coast of Oregon at 21:08 UTC. A tsunami evaluation was automatically initiated given the magnitude and location. See the M5.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-09 2021-12-09 20:33:17 UTC | 2.4ml | Rat Islands, Aleutian Islands, Alaska 52.019°, 178.298° | 1.6 km | - | - | - | ✓ Reviewed | USGS → |
At 20:33 UTC on December 9, 2021, a magnitude 2.4 tremor occurred near Rat Islands, Aleutian Islands, Alaska. It arrived roughly 1 hours after a larger magnitude 4.3 mainshock in the same 20 km area, placing it within the typical aftershock window. 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. | ||||||||
2021-12-09 2021-12-09 20:15:17 UTC | 2.1md | 8 km E of P?hala, Hawaii 19.209°, -155.403° | 32.6 km | - | - | - | Auto | USGS → |
On December 9, 2021 at 20:15 UTC, a magnitude 2.1 earthquake struck 8 km E of P?hala, Hawaii. Coming 8 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 M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-09 2021-12-09 20:14:36 UTC | 2.1ml | 22 km ENE of Honaunau-Napoopoo, Hawaii 19.514°, -155.663° | 4.9 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.1 earthquake 22 km ENE of Honaunau-Napoopoo, Hawaii with origin time 20:14 UTC on December 9, 2021. 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. | ||||||||
2021-12-09 2021-12-09 20:11:54 UTC | 2.1md | 1 km W of P?hala, Hawaii 19.203°, -155.490° | 34.2 km | - | - | - | Auto | USGS → |
On December 9, 2021, worldwide seismic activity registered a magnitude 2.1 earthquake 1 km W of P?hala, Hawaii at 20:11 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.6 earthquake that occurred about 8 hours earlier. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-09 2021-12-09 20:06:40 UTC | 2.3ml | Rat Islands, Aleutian Islands, Alaska 52.017°, 178.332° | 5.7 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.3 seismic event took place near Rat Islands, Aleutian Islands, Alaska on December 9, 2021 at 20:06 UTC. This event falls inside the aftershock decay of a nearby magnitude 4.3 earthquake that occurred about 1 hours earlier. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-09 2021-12-09 19:54:59 UTC | 2.5ml | Rat Islands, Aleutian Islands, Alaska 51.992°, 178.323° | 5.1 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.5 earthquake near Rat Islands, Aleutian Islands, Alaska with origin time 19:54 UTC on December 9, 2021. This event falls inside the aftershock decay of a nearby magnitude 4.3 earthquake that occurred about 1 hours earlier. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-09 2021-12-09 19:24:15 UTC | 3.2ml | Rat Islands, Aleutian Islands, Alaska 52.007°, 178.286° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On December 9, 2021, worldwide seismic activity registered a magnitude 3.2 earthquake near Rat Islands, Aleutian Islands, Alaska at 19:24 UTC. Coming 1 hours after a magnitude 4.3 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M3.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-12-09 2021-12-09 19:24:00 UTC | 2.9ml | Rat Islands, Aleutian Islands, Alaska 51.995°, 178.290° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.9 earthquake was recorded near Rat Islands, Aleutian Islands, Alaska on December 9, 2021 at 19:24 UTC. This event falls inside the aftershock decay of a nearby magnitude 4.3 earthquake that occurred about 1 hours earlier. See the M2.9 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 9, 2021. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.