Earthquakes on March 31, 2023
326
EARTHQUAKES on March 31, 2023
24-hour UTC period · USGS data
10 km deep
Elevated activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
3
M4.0–4.9
30
M3.0–3.9
12
M2.0–2.9
68
M1.0–1.9
213
Activity Summary
326
Total earthquakes
~250
Daily average
Elevated
Activity level
3
M5.0+ events
Significant Earthquakes (M4.5+)
5.6
western Indian-Antarctic Ridge
22:36 UTC · 10.0 km deep
5.3
Bonin Islands, Japan region
05:52 UTC · 64.4 km deep
5.2
81 km NNE of Taltal, Chile
10:46 UTC · 49.4 km deep
Felt by 2
4.9
73 km NNE of Ruteng, Indonesia
17:55 UTC · 24.5 km deep
4.9
108 km S of Honchō, Japan
15:29 UTC · 50.3 km deep
4.8
37 km WNW of Sérifos, Greece
16:05 UTC · 129.1 km deep
Felt by 4
4.8
90 km S of Nusa Dua, Indonesia
08:28 UTC · 61.4 km deep
Felt by 9
4.7
western Indian-Antarctic Ridge
08:27 UTC · 10.0 km deep
Earthquake Map — March 31, 2023
All Earthquakes — March 31, 2023
Showing 30 of 113 (filtered from 326)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2023-03-31 2023-03-31 23:57:07 UTC | 2.9ml | Andreanof Islands, Aleutian Islands, Alaska 51.444°, -176.533° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.9 earthquake near Andreanof Islands, Aleutian Islands, Alaska at 23:57 UTC on March 31, 2023. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-31 2023-03-31 23:30:13 UTC | 2.0ml | 45 km NW of Toyah, Texas 31.616°, -104.116° | 6.5 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.0 earthquake was recorded 45 km NW of Toyah, Texas on March 31, 2023 at 23:30 UTC. Coming 3 hours after a magnitude 2.2 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-31 2023-03-31 22:57:38 UTC | 4.4mb | western Indian-Antarctic Ridge -50.242°, 114.766° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.4 earthquake was recorded near western Indian-Antarctic Ridge on March 31, 2023 at 22:57 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-31 2023-03-31 22:57:19 UTC | 2.5md | 10km NW of Petrolia, CA 40.396°, -124.367° | 20.7 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.5 earthquake 10km NW of Petrolia, CA at 22:57 UTC on March 31, 2023. Coming 23 hours after a magnitude 2.8 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-31 2023-03-31 22:37:21 UTC | 2.2ml | 60 km W of Anchor Point, Alaska 59.884°, -152.885° | 93.8 km | - | - | - | ✓ Reviewed | USGS → |
March 31, 2023 brought a magnitude 2.2 earthquake 60 km W of Anchor Point, Alaska, logged at 22:37 UTC. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-31 2023-03-31 22:36:11 UTC | 5.6mww | western Indian-Antarctic Ridge -50.002°, 114.065° | 10.0 km | - | - | green | ✓ Reviewed | USGS → |
On March 31, 2023 at 22:36 UTC, a magnitude 5.6 earthquake struck near western Indian-Antarctic Ridge. The USGS PAGER system assigned a green alert level for this event, signalling no significant casualties or damage expected. It is the largest earthquake currently listed for worldwide seismic activity on March 31, 2023. See the M5.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-31 2023-03-31 22:24:25 UTC | 2.0ml | 79 km SW of Karluk, Alaska 57.142°, -155.522° | 55.7 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.0 earthquake 79 km SW of Karluk, Alaska with origin time 22:24 UTC on March 31, 2023. It arrived roughly 7 hours after a larger magnitude 2.3 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-31 2023-03-31 21:51:44 UTC | 2.1ml | western Texas 31.619°, -104.123° | 6.1 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.1 earthquake near western Texas with origin time 21:51 UTC on March 31, 2023. Coming 2 hours after a magnitude 2.2 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. | ||||||||
2023-03-31 2023-03-31 21:35:47 UTC | 4.1mb | 222 km WNW of Bandon, Oregon 43.596°, -127.072° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
March 31, 2023 brought a magnitude 4.1 earthquake 222 km WNW of Bandon, Oregon, logged at 21:35 UTC. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-31 2023-03-31 21:30:17 UTC | 2.4md | 16km SSE of Tres Pinos, CA 36.655°, -121.278° | 5.9 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.4 seismic event took place 16km SSE of Tres Pinos, CA on March 31, 2023 at 21:30 UTC. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-31 2023-03-31 21:23:26 UTC | 2.5md | 20 km NNW of Brenas, Puerto Rico 18.643°, -66.397° | 63.9 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.5 earthquake was recorded 20 km NNW of Brenas, Puerto Rico on March 31, 2023 at 21:23 UTC. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-31 2023-03-31 20:58:22 UTC | 4.2mb | Kermadec Islands region -30.349°, -176.703° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.2 earthquake in the Kermadec Islands region with origin time 20:58 UTC on March 31, 2023. This event falls inside the aftershock decay of a nearby magnitude 4.4 earthquake that occurred about 14 hours earlier. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-31 2023-03-31 20:56:28 UTC | 2.3ml | 12 km SSE of Red Dog Mine, Alaska 67.941°, -162.772° | 11.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.3 earthquake 12 km SSE of Red Dog Mine, Alaska with origin time 20:56 UTC on March 31, 2023. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-31 2023-03-31 20:53:40 UTC | 4.3mb | Owen Fracture Zone region 14.548°, 56.189° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.3 event was detected in the Owen Fracture Zone region on March 31, 2023, with origin time 20:53 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-31 2023-03-31 20:48:56 UTC | 2.0ml | 44 km E of Pedro Bay, Alaska 59.759°, -153.318° | 124.0 km | - | - | - | ✓ Reviewed | USGS → |
On March 31, 2023, worldwide seismic activity registered a magnitude 2.0 earthquake 44 km E of Pedro Bay, Alaska at 20:48 UTC. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-31 2023-03-31 20:35:42 UTC | 2.2md | 27 km SE of Baker City, Oregon 44.625°, -117.556° | -1.1 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.2 event was detected 27 km SE of Baker City, Oregon on March 31, 2023, with origin time 20:35 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-31 2023-03-31 20:34:29 UTC | 3.2ml | 49 km SE of Atka, Alaska 51.834°, -173.773° | 149.6 km | - | - | - | ✓ Reviewed | USGS → |
On March 31, 2023 at 20:34 UTC, a magnitude 3.2 earthquake struck 49 km SE of Atka, Alaska. The event was offshore. See the M3.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-31 2023-03-31 20:25:16 UTC | 3.2ml | 123 km WSW of Nikolski, Alaska 52.625°, -170.617° | 127.1 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 3.2 earthquake was recorded 123 km WSW of Nikolski, Alaska on March 31, 2023 at 20:25 UTC. See the M3.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-31 2023-03-31 20:22:35 UTC | 3.7mb | 40 km NNW of Yigo Village, Guam 13.870°, 144.742° | 151.7 km | - | - | - | ✓ Reviewed | USGS → |
At 20:22 UTC on March 31, 2023, a magnitude 3.7 tremor occurred 40 km NNW of Yigo Village, Guam. See the M3.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-31 2023-03-31 20:21:17 UTC | 2.2ml | 47 km NW of Toyah, Texas 31.566°, -104.198° | 8.2 km | - | - | - | ✓ Reviewed | USGS → |
On March 31, 2023 at 20:21 UTC, a magnitude 2.2 earthquake struck 47 km NW of Toyah, Texas. In the 72 hours after this event, the USGS recorded 3 smaller earthquakes within 20 km, consistent with an ongoing aftershock sequence rooted here. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-31 2023-03-31 20:17:24 UTC | 2.0ml | 5 km SSW of P?hala, Hawaii 19.154°, -155.494° | 33.7 km | - | - | - | Auto | USGS → |
At 20:17 UTC on March 31, 2023, a magnitude 2.0 tremor occurred 5 km SSW of P?hala, Hawaii. Coming 1 hours after a magnitude 2.3 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-31 2023-03-31 20:14:30 UTC | 2.1ml | 10 km ENE of P?hala, Hawaii 19.242°, -155.390° | 28.6 km | - | - | - | Auto | USGS → |
Reports of a magnitude 2.1 earthquake 10 km ENE of P?hala, Hawaii came in on March 31, 2023 at 20:14 UTC. It arrived roughly 1 hours after a larger magnitude 2.3 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-31 2023-03-31 20:00:50 UTC | 2.7ml | 14km E of San Miguel Is., CA 34.039°, -120.215° | -0.4 km | 3 | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.7 earthquake 14km E of San Miguel Is., CA at 20:00 UTC on March 31, 2023. 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. | ||||||||
2023-03-31 2023-03-31 19:58:21 UTC | 2.2ml | 1 km NE of Lindsay, Texas 31.383°, -103.524° | 5.5 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.2 earthquake was recorded 1 km NE of Lindsay, Texas on March 31, 2023 at 19:58 UTC. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-31 2023-03-31 19:52:36 UTC | 4.2mb | 146 km NW of Tumxuk, China 40.961°, 78.096° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On March 31, 2023, worldwide seismic activity registered a magnitude 4.2 earthquake 146 km NW of Tumxuk, China at 19:52 UTC. The event was offshore. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-31 2023-03-31 19:34:21 UTC | 2.0ml | 32 km ENE of Ouzinkie, Alaska 57.987°, -151.964° | 29.1 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.0 earthquake 32 km ENE of Ouzinkie, Alaska at 19:34 UTC on March 31, 2023. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-31 2023-03-31 19:33:13 UTC | 4.3mb | near the east coast of Honshu, Japan 38.699°, 142.046° | 56.7 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.3 earthquake near near the east coast of Honshu, Japan came in on March 31, 2023 at 19:33 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-31 2023-03-31 19:33:12 UTC | 2.7ml | 28 km SW of Atka, Alaska 52.007°, -174.483° | 100.1 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.7 earthquake was recorded 28 km SW of Atka, Alaska on March 31, 2023 at 19:33 UTC. The event was offshore. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-31 2023-03-31 19:29:12 UTC | 2.3md | 5 km WSW of Guánica, Puerto Rico 17.957°, -66.954° | 9.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.3 earthquake was recorded 5 km WSW of Guánica, Puerto Rico on March 31, 2023 at 19:29 UTC. Coming 3 hours after a magnitude 2.7 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-03-31 2023-03-31 19:19:17 UTC | 3.0ml | 92 km SW of Unalaska, Alaska 53.304°, -167.559° | 93.6 km | - | - | - | ✓ Reviewed | USGS → |
At 19:19 UTC on March 31, 2023, a magnitude 3.0 tremor occurred 92 km SW of Unalaska, Alaska. The event was offshore. 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 March 31, 2023. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.