Earthquakes on December 4, 2020
500
EARTHQUAKES on December 4, 2020
24-hour UTC period · USGS data
LARGEST: M5.1 — Mid-Indian Ridge
10 km deep
Elevated activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
4
M4.0–4.9
37
M3.0–3.9
18
M2.0–2.9
106
M1.0–1.9
335
Activity Summary
500
Total earthquakes
~250
Daily average
Elevated
Activity level
4
M5.0+ events
Geographic Breakdown
By US State
Top Countries (International)
Significant Earthquakes (M4.5+)
5.1
Mid-Indian Ridge
20:30 UTC · 10.0 km deep
5.1
45 km NNW of San Antonio de los Cobres, Argentina
04:06 UTC · 193.4 km deep
5.0
32 km NW of Villa Basilio Nievas, Argentina
05:48 UTC · 105.4 km deep
Felt by 1
5.0
70 km WSW of Masachapa, Nicaragua
02:19 UTC · 10.0 km deep
4.9
Mid-Indian Ridge
02:43 UTC · 10.0 km deep
4.8
223 km N of Lospalos, Timor Leste
09:57 UTC · 405.5 km deep
4.7
Mid-Indian Ridge
23:36 UTC · 10.0 km deep
4.7
Mid-Indian Ridge
18:10 UTC · 10.0 km deep
Earthquake Map — December 4, 2020
All Earthquakes — December 4, 2020
Showing 30 of 165 (filtered from 500)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2020-12-04 2020-12-04 23:55:36 UTC | 3.9mb | 16 km SSE of La Troncal, Ecuador -2.561°, -79.287° | 10.0 km | 1 | - | - | ✓ Reviewed | USGS → |
A magnitude 3.9 earthquake was recorded 16 km SSE of La Troncal, Ecuador on December 4, 2020 at 23:55 UTC. See the M3.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-12-04 2020-12-04 23:53:27 UTC | 3.9mb | 20 km S of La Troncal, Ecuador -2.610°, -79.312° | 2.3 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 3.9 earthquake 20 km S of La Troncal, Ecuador with origin time 23:53 UTC on December 4, 2020. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M3.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-12-04 2020-12-04 23:36:00 UTC | 4.7mb | Mid-Indian Ridge -40.169°, 77.714° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.7 event was detected near Mid-Indian Ridge on December 4, 2020, with origin time 23:36 UTC. It arrived roughly 3 hours after a larger magnitude 5.1 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M4.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-12-04 2020-12-04 23:27:19 UTC | 2.2ml | 101 km SSE of Sand Point, Alaska 54.442°, -160.168° | 15.3 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.2 earthquake 101 km SSE of Sand Point, Alaska at 23:27 UTC on December 4, 2020. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-12-04 2020-12-04 23:25:35 UTC | 2.6ml | 8 km SSE of Volcano, Hawaii 19.369°, -155.215° | 1.9 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.6 earthquake 8 km SSE of Volcano, Hawaii at 23:25 UTC on December 4, 2020. This event falls inside the aftershock decay of a nearby magnitude 2.8 earthquake that occurred about 3 hours earlier. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-12-04 2020-12-04 23:18:08 UTC | 3.0ml | 13 km SW of Susitna, Alaska 61.468°, -150.715° | 73.7 km | 10 | II | - | ✓ Reviewed | USGS → |
At 23:18 UTC on December 4, 2020, a magnitude 3.0 tremor occurred 13 km SW of Susitna, Alaska. The event was offshore. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-12-04 2020-12-04 23:03:08 UTC | 2.5ml | 53 km ENE of Pedro Bay, Alaska 59.888°, -153.181° | 119.6 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.5 earthquake 53 km ENE of Pedro Bay, Alaska came in on December 4, 2020 at 23:03 UTC. It arrived roughly 2 hours after a larger magnitude 2.8 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-12-04 2020-12-04 22:54:03 UTC | 2.0ml | 21 km WNW of Happy Valley, Alaska 60.008°, -152.099° | 83.7 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.0 earthquake was recorded 21 km WNW of Happy Valley, Alaska on December 4, 2020 at 22:54 UTC. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-12-04 2020-12-04 22:41:15 UTC | 3.1ml | 28 km SSE of Mina, Nevada 38.148°, -117.992° | 7.9 km | - | - | - | ✓ Reviewed | USGS → |
On December 4, 2020, worldwide seismic activity registered a magnitude 3.1 earthquake 28 km SSE of Mina, Nevada at 22:41 UTC. Coming 5 hours after a magnitude 3.2 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M3.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-12-04 2020-12-04 22:40:42 UTC | 2.1ml | 22 km NNE of Trout Creek, Montana 48.004°, -115.439° | 7.1 km | - | - | - | ✓ Reviewed | USGS → |
At 22:40 UTC on December 4, 2020, a magnitude 2.1 tremor occurred 22 km NNE of Trout Creek, Montana. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-12-04 2020-12-04 22:24:32 UTC | 2.2ml | 69 km W of Happy Valley, Alaska 60.052°, -152.952° | 114.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.2 event was detected 69 km W of Happy Valley, Alaska on December 4, 2020, with origin time 22:24 UTC. Coming 3 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 M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-12-04 2020-12-04 22:10:24 UTC | 2.5ml | 71 km ESE of Sand Point, Alaska 55.010°, -159.538° | 23.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.5 seismic event took place 71 km ESE of Sand Point, Alaska on December 4, 2020 at 22:10 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.5 earthquake that occurred about 1 hours earlier. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-12-04 2020-12-04 22:08:39 UTC | 4.1mb | 26 km NE of Barcelona, Philippines 8.330°, 126.603° | 47.5 km | - | - | - | ✓ Reviewed | USGS → |
On December 4, 2020, worldwide seismic activity registered a magnitude 4.1 earthquake 26 km NE of Barcelona, Philippines at 22:08 UTC. The event was offshore. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-12-04 2020-12-04 22:04:22 UTC | 2.0ml | 7km SW of Anza, CA 33.520°, -116.734° | 2.9 km | - | - | - | ✓ Reviewed | USGS → |
December 4, 2020 brought a magnitude 2.0 earthquake 7km SW of Anza, CA, logged at 22:04 UTC. Coming 10 hours after a magnitude 2.9 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-12-04 2020-12-04 21:54:39 UTC | 2.1ml | 18km SSE of Lone Pine, CA 36.441°, -117.988° | 4.3 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.1 event was detected 18km SSE of Lone Pine, CA on December 4, 2020, with origin time 21:54 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. | ||||||||
2020-12-04 2020-12-04 21:52:55 UTC | 4.3mb | 65 km SSW of Bengkulu, Indonesia -4.382°, 102.144° | 42.5 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.3 earthquake was recorded 65 km SSW of Bengkulu, Indonesia on December 4, 2020 at 21:52 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-12-04 2020-12-04 21:41:24 UTC | 3.5ml | 71 km ESE of Sand Point, Alaska 55.018°, -159.525° | 25.4 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 3.5 earthquake 71 km ESE of Sand Point, Alaska at 21:41 UTC on December 4, 2020. See the M3.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-12-04 2020-12-04 21:36:34 UTC | 4.0mb | 94 km NW of Madang, Papua New Guinea -4.716°, 145.103° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.0 seismic event took place 94 km NW of Madang, Papua New Guinea on December 4, 2020 at 21:36 UTC. The event was offshore. See the M4.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-12-04 2020-12-04 21:26:31 UTC | 2.7ml | 126 km SSE of Sand Point, Alaska 54.247°, -159.938° | 16.8 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.7 earthquake 126 km SSE of Sand Point, Alaska at 21:26 UTC on December 4, 2020. It arrived roughly 8 hours after a larger magnitude 3.2 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-12-04 2020-12-04 21:16:24 UTC | 2.7ml | 4 km SW of Glencoe, Oklahoma 36.203°, -96.969° | 7.8 km | - | - | - | ✓ Reviewed | USGS → |
December 4, 2020 brought a magnitude 2.7 earthquake 4 km SW of Glencoe, Oklahoma, logged at 21:16 UTC. The event was offshore. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-12-04 2020-12-04 21:01:42 UTC | 2.7md | 2 km SSE of Palomas, Puerto Rico 17.989°, -66.863° | 15.0 km | - | - | - | ✓ Reviewed | USGS → |
On December 4, 2020 at 21:01 UTC, a magnitude 2.7 earthquake struck 2 km SSE of Palomas, Puerto Rico. Coming 7 hours after a magnitude 3.0 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-12-04 2020-12-04 20:45:20 UTC | 3.5ml | 22 km E of Point Possession, Alaska 60.893°, -150.271° | 48.3 km | 55 | II | - | ✓ Reviewed | USGS → |
This magnitude 3.5 event was detected 22 km E of Point Possession, Alaska on December 4, 2020, with origin time 20:45 UTC. The event was offshore. See the M3.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-12-04 2020-12-04 20:43:33 UTC | 2.4ml | 128 km SSE of Sand Point, Alaska 54.261°, -159.794° | 25.5 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.4 seismic event took place 128 km SSE of Sand Point, Alaska on December 4, 2020 at 20:43 UTC. Coming 7 hours after a magnitude 3.2 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. | ||||||||
2020-12-04 2020-12-04 20:39:46 UTC | 2.8ml | Southern Alaska 59.849°, -153.322° | 116.5 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.8 seismic event took place near Southern Alaska on December 4, 2020 at 20:39 UTC. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-12-04 2020-12-04 20:30:11 UTC | 5.1mww | Mid-Indian Ridge -40.229°, 77.922° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On December 4, 2020 at 20:30 UTC, a magnitude 5.1 earthquake struck near Mid-Indian Ridge. It is the largest earthquake currently listed for worldwide seismic activity on December 4, 2020. See the M5.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-12-04 2020-12-04 20:29:35 UTC | 4.4mb | Mid-Indian Ridge -40.209°, 77.830° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.4 earthquake near Mid-Indian Ridge at 20:29 UTC on December 4, 2020. It arrived roughly 2 hours after a larger magnitude 4.7 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-12-04 2020-12-04 20:26:51 UTC | 2.0ml | 118 km WSW of Adak, Alaska 51.436°, -178.196° | 15.9 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.0 earthquake 118 km WSW of Adak, Alaska with origin time 20:26 UTC on December 4, 2020. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-12-04 2020-12-04 20:18:20 UTC | 4.3mb | south of the Fiji Islands -22.210°, -179.507° | 582.2 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.3 earthquake south of the Fiji Islands with origin time 20:18 UTC on December 4, 2020. This is the deepest earthquake in the current dataset — a deep-focus event. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-12-04 2020-12-04 20:14:56 UTC | 2.8ml | 9 km S of Volcano, Hawaii 19.359°, -155.219° | 0.5 km | - | - | - | Auto | USGS → |
At 20:14 UTC on December 4, 2020, a magnitude 2.8 tremor occurred 9 km S of Volcano, Hawaii. Coming 1 hours after a magnitude 2.8 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2020-12-04 2020-12-04 20:14:55 UTC | 2.8ml | 8 km SSE of Volcano, Hawaii 19.372°, -155.210° | 1.8 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.8 earthquake 8 km SSE of Volcano, Hawaii came in on December 4, 2020 at 20:14 UTC. In the 72 hours after this event, the USGS recorded 7 smaller earthquakes within 20 km, consistent with an ongoing aftershock sequence rooted here. See the M2.8 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 4, 2020. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.