Earthquakes on March 21, 2023
267
EARTHQUAKES on March 21, 2023
24-hour UTC period · USGS data
192 km deep · 1,084 people felt it
Normal activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
6
M4.0–4.9
39
M3.0–3.9
8
M2.0–2.9
53
M1.0–1.9
161
Activity Summary
267
Total earthquakes
~250
Daily average
Normal
Activity level
6
M5.0+ events
Geographic Breakdown
By US State
Top Countries (International)
Significant Earthquakes (M4.5+)
6.5
40 km SSE of Jurm, Afghanistan
16:47 UTC · 192.0 km deep
Felt by 1,084
5.6
14 km NW of Melipilla, Chile
17:38 UTC · 60.0 km deep
Felt by 233
5.5
northern Mid-Atlantic Ridge
20:41 UTC · 10.0 km deep
5.5
8 km SE of Quepos, Costa Rica
01:44 UTC · 35.0 km deep
Felt by 114
5.2
46 km SSW of Hualien City, Taiwan
01:45 UTC · 8.3 km deep
Felt by 12
5.0
northern Mid-Atlantic Ridge
20:49 UTC · 10.0 km deep
4.9
northern Mid-Atlantic Ridge
20:50 UTC · 10.0 km deep
4.9
northern Mid-Atlantic Ridge
20:48 UTC · 10.0 km deep
Earthquake Map — March 21, 2023
All Earthquakes — March 21, 2023
Showing 30 of 106 (filtered from 267)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2023-03-21 2023-03-21 23:40:35 UTC | 2.1ml | 23 km NNW of Three Rivers, Texas 28.656°, -98.267° | 5.7 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.1 event was detected 23 km NNW of Three Rivers, Texas on March 21, 2023, with origin time 23:40 UTC. Coming 11 hours after a magnitude 2.4 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. | ||||||||
2023-03-21 2023-03-21 23:24:40 UTC | 2.3ml | 6km WSW of Anza, CA 33.528°, -116.732° | 3.6 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.3 event was detected 6km WSW of Anza, CA on March 21, 2023, with origin time 23:24 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. | ||||||||
2023-03-21 2023-03-21 23:18:19 UTC | 4.5mw | 10km WSW of Ferndale, CA 40.541°, -124.373° | 18.1 km | 738 | IV | green | ✓ Reviewed | USGS → |
At 23:18 UTC on March 21, 2023, a magnitude 4.5 tremor occurred 10km WSW of Ferndale, CA. 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 M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-21 2023-03-21 23:16:25 UTC | 4.1mb | Kermadec Islands region -31.671°, -178.955° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.1 seismic event took place in the Kermadec Islands region on March 21, 2023 at 23:16 UTC. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-21 2023-03-21 23:11:16 UTC | 2.0md | 11km S of Tres Pinos, CA 36.691°, -121.331° | 4.4 km | 1 | - | - | ✓ Reviewed | USGS → |
On March 21, 2023, worldwide seismic activity registered a magnitude 2.0 earthquake 11km S of Tres Pinos, CA at 23:11 UTC. 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. | ||||||||
2023-03-21 2023-03-21 23:00:42 UTC | 4.1mb | 44 km NNE of Lae, Papua New Guinea -6.336°, 147.090° | 46.5 km | - | - | - | ✓ Reviewed | USGS → |
March 21, 2023 brought a magnitude 4.1 earthquake 44 km NNE of Lae, Papua New Guinea, logged at 23:00 UTC. It arrived roughly 1 hours after a larger magnitude 4.4 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-21 2023-03-21 22:49:44 UTC | 2.6ml | Eastern Montana 45.112°, -106.895° | 0.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.6 earthquake near Eastern Montana at 22:49 UTC on March 21, 2023. 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. | ||||||||
2023-03-21 2023-03-21 22:45:30 UTC | 4.4mb | 34 km NNE of Lae, Papua New Guinea -6.435°, 147.105° | 42.3 km | - | - | - | ✓ Reviewed | USGS → |
On March 21, 2023 at 22:45 UTC, a magnitude 4.4 earthquake struck 34 km NNE of Lae, Papua New Guinea. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-21 2023-03-21 22:34:55 UTC | 3.2ml | 12 km ESE of Wright, Wyoming 43.715°, -105.346° | 0.0 km | - | - | - | ✓ Reviewed | USGS → |
March 21, 2023 brought a magnitude 3.2 earthquake 12 km ESE of Wright, Wyoming, logged at 22:34 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. | ||||||||
2023-03-21 2023-03-21 22:09:20 UTC | 3.1md | 68 km N of Brenas, Puerto Rico 19.083°, -66.354° | 22.5 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 3.1 earthquake 68 km N of Brenas, Puerto Rico with origin time 22:09 UTC on March 21, 2023. The event was offshore. See the M3.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-21 2023-03-21 21:50:10 UTC | 2.3md | 7 km WSW of Guánica, Puerto Rico 17.944°, -66.968° | 14.6 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.3 earthquake was recorded 7 km WSW of Guánica, Puerto Rico on March 21, 2023 at 21:50 UTC. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-21 2023-03-21 21:46:38 UTC | 4.5mb | northern Mid-Atlantic Ridge 28.297°, -43.641° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.5 earthquake near northern Mid-Atlantic Ridge at 21:46 UTC on March 21, 2023. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-21 2023-03-21 21:45:57 UTC | 4.3mb | northern Mid-Atlantic Ridge 28.688°, -43.637° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.3 earthquake near northern Mid-Atlantic Ridge came in on March 21, 2023 at 21:45 UTC. It arrived roughly 1 hours after a larger magnitude 4.9 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. | ||||||||
2023-03-21 2023-03-21 21:27:28 UTC | 4.2mb | eastern Sichuan, China 29.628°, 104.715° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.2 earthquake near eastern Sichuan, China with origin time 21:27 UTC on March 21, 2023. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-21 2023-03-21 20:50:12 UTC | 4.9mb | northern Mid-Atlantic Ridge 28.506°, -43.649° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.9 event was detected near northern Mid-Atlantic Ridge on March 21, 2023, with origin time 20:50 UTC. It arrived roughly 1 hours after a larger magnitude 5.5 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-21 2023-03-21 20:49:21 UTC | 5.0mb | northern Mid-Atlantic Ridge 28.474°, -43.750° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 5.0 earthquake near northern Mid-Atlantic Ridge at 20:49 UTC on March 21, 2023. Coming 1 hours after a magnitude 5.5 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M5.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-21 2023-03-21 20:48:05 UTC | 4.9mb | northern Mid-Atlantic Ridge 28.692°, -43.739° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.9 earthquake near northern Mid-Atlantic Ridge came in on March 21, 2023 at 20:48 UTC. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-21 2023-03-21 20:47:34 UTC | 2.1ml | 6km WSW of Anza, CA 33.528°, -116.734° | 3.6 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.1 earthquake 6km WSW of Anza, CA at 20:47 UTC on March 21, 2023. 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. | ||||||||
2023-03-21 2023-03-21 20:46:54 UTC | 4.9mb | northern Mid-Atlantic Ridge 28.496°, -43.626° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.9 seismic event took place near northern Mid-Atlantic Ridge on March 21, 2023 at 20:46 UTC. Coming 1 hours after a magnitude 5.5 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-21 2023-03-21 20:43:49 UTC | 4.4mb | northern Mid-Atlantic Ridge 28.470°, -43.562° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.4 earthquake was recorded near northern Mid-Atlantic Ridge on March 21, 2023 at 20:43 UTC. It arrived roughly 1 hours after a larger magnitude 5.5 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. | ||||||||
2023-03-21 2023-03-21 20:41:31 UTC | 2.4ml | 10 km ENE of P?hala, Hawaii 19.243°, -155.389° | 30.7 km | - | - | - | Auto | USGS → |
On March 21, 2023 at 20:41 UTC, a magnitude 2.4 earthquake struck 10 km ENE of P?hala, Hawaii. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-21 2023-03-21 20:41:07 UTC | 5.5mww | northern Mid-Atlantic Ridge 28.507°, -43.593° | 10.0 km | - | - | green | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 5.5 earthquake near northern Mid-Atlantic Ridge with origin time 20:41 UTC on March 21, 2023. In the 72 hours after this event, the USGS recorded 4 smaller earthquakes within 20 km, consistent with an ongoing aftershock sequence rooted here. The USGS PAGER system assigned a green alert level for this event, signalling no significant casualties or damage expected. See the M5.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-21 2023-03-21 20:40:29 UTC | 2.0ml | 50 km NE of Chenega, Alaska 60.388°, -147.361° | 15.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.0 seismic event took place 50 km NE of Chenega, Alaska on March 21, 2023 at 20:40 UTC. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-21 2023-03-21 20:37:55 UTC | 4.4mb | Banda Sea -6.512°, 130.155° | 136.9 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.4 earthquake near Banda Sea with origin time 20:37 UTC on March 21, 2023. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-21 2023-03-21 20:06:53 UTC | 4.4mb | Fiji region -19.069°, -177.641° | 552.7 km | - | - | - | ✓ Reviewed | USGS → |
On March 21, 2023, worldwide seismic activity registered a magnitude 4.4 earthquake in the Fiji region at 20:06 UTC. This deep-focus earthquake originated far below the brittle crust, deep inside the mantle. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-21 2023-03-21 20:05:46 UTC | 2.2md | 1 km ENE of Lluveras, Puerto Rico 18.046°, -66.891° | 15.7 km | - | - | - | ✓ Reviewed | USGS → |
On March 21, 2023, worldwide seismic activity registered a magnitude 2.2 earthquake 1 km ENE of Lluveras, Puerto Rico at 20:05 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.2 earthquake that occurred about 7 hours earlier. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-21 2023-03-21 19:32:44 UTC | 4.5mb | near the north coast of Papua, Indonesia -2.604°, 140.655° | 31.1 km | 1 | - | - | ✓ Reviewed | USGS → |
This magnitude 4.5 event was detected near near the north coast of Papua, Indonesia on March 21, 2023, with origin time 19:32 UTC. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-21 2023-03-21 19:13:41 UTC | 2.2ml | 99 km W of Adak, Alaska 51.869°, -178.081° | 5.0 km | - | - | - | ✓ Reviewed | USGS → |
At 19:13 UTC on March 21, 2023, a magnitude 2.2 tremor occurred 99 km W of Adak, Alaska. Coming 3 hours after a magnitude 2.5 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. | ||||||||
2023-03-21 2023-03-21 19:10:28 UTC | 2.2ml | 35 km WSW of Salamatof, Alaska 60.500°, -151.927° | 75.8 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.2 earthquake 35 km WSW of Salamatof, Alaska at 19:10 UTC on March 21, 2023. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-21 2023-03-21 19:06:10 UTC | 4.1mb | Near the south coast of Papua, Indonesia -4.094°, 133.561° | 21.4 km | - | - | - | ✓ Reviewed | USGS → |
On March 21, 2023 at 19:06 UTC, a magnitude 4.1 earthquake struck near Near the south coast of Papua, Indonesia. See the M4.1 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 March 21, 2023. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.