Earthquakes on February 28, 2023
332
EARTHQUAKES on February 28, 2023
24-hour UTC period · USGS data
LARGEST: M5.4 — Carlsberg Ridge
10 km deep
Elevated activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
7
M4.0–4.9
53
M3.0–3.9
12
M2.0–2.9
58
M1.0–1.9
202
Activity Summary
332
Total earthquakes
~250
Daily average
Elevated
Activity level
7
M5.0+ events
Geographic Breakdown
By US State
Top Countries (International)
Significant Earthquakes (M4.5+)
5.4
Carlsberg Ridge
12:07 UTC · 10.0 km deep
5.2
36 km S of Iztapa, Guatemala
19:44 UTC · 69.3 km deep
Felt by 10
5.2
42 km S of Kangding, China
14:46 UTC · 10.0 km deep
Felt by 5
5.2
276 km SSE of Katsuura, Japan
11:12 UTC · 10.0 km deep
5.1
72 km E of Bitung, Indonesia
14:42 UTC · 64.5 km deep
Felt by 2
5.0
La Rioja-Cordoba border region, Argentina
04:49 UTC · 10.4 km deep
5.0
Tajikistan-Xinjiang border region
04:20 UTC · 10.0 km deep
4.8
69 km S of Kushiro, Japan
11:09 UTC · 74.9 km deep
Earthquake Map — February 28, 2023
All Earthquakes — February 28, 2023
Showing 30 of 130 (filtered from 332)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2023-02-28 2023-02-28 23:57:36 UTC | 2.9ml | 37 km WSW of Mentone, Texas 31.617°, -103.982° | 7.2 km | - | - | - | ✓ Reviewed | USGS → |
At 23:57 UTC on February 28, 2023, a magnitude 2.9 tremor occurred 37 km WSW of Mentone, Texas. Coming 1 hours after a magnitude 4.1 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-02-28 2023-02-28 23:55:09 UTC | 2.6ml | 92 km W of Adak, Alaska 51.866°, -177.974° | 9.4 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.6 seismic event took place 92 km W of Adak, Alaska on February 28, 2023 at 23:55 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.5 earthquake that occurred about 1 hours earlier. The event was offshore. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-02-28 2023-02-28 23:32:10 UTC | 4.1mb | 29 km ENE of Nurda??, Turkey 37.281°, 37.032° | 12.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.1 seismic event took place 29 km ENE of Nurda??, Turkey on February 28, 2023 at 23:32 UTC. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-02-28 2023-02-28 23:28:06 UTC | 2.0ml | 46 km SW of Denali National Park, Alaska 63.229°, -152.339° | 5.3 km | - | - | - | ✓ Reviewed | USGS → |
On February 28, 2023, worldwide seismic activity registered a magnitude 2.0 earthquake 46 km SW of Denali National Park, Alaska at 23:28 UTC. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-02-28 2023-02-28 23:27:17 UTC | 2.7ml | 38 km NNW of Toyah, Texas 31.617°, -103.998° | 8.2 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.7 earthquake 38 km NNW of Toyah, Texas with origin time 23:27 UTC on February 28, 2023. This event falls inside the aftershock decay of a nearby magnitude 4.1 earthquake that occurred about 1 hours earlier. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-02-28 2023-02-28 23:26:08 UTC | 4.1ml | 37 km NNW of Toyah, Texas 31.613°, -103.989° | 8.5 km | 2 | IV | green | ✓ Reviewed | USGS → |
February 28, 2023 brought a magnitude 4.1 earthquake 37 km NNW of Toyah, Texas, logged at 23:26 UTC. 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 M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-02-28 2023-02-28 23:01:39 UTC | 3.0ml | 1 km SE of Clifton, New Zealand -43.576°, 172.767° | 16.8 km | 5 | - | - | ✓ Reviewed | USGS → |
A magnitude 3.0 earthquake was recorded 1 km SE of Clifton, New Zealand on February 28, 2023 at 23:01 UTC. The event was offshore. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-02-28 2023-02-28 22:49:58 UTC | 2.7ml | 92 km W of Adak, Alaska 51.889°, -177.983° | 9.6 km | - | - | - | ✓ Reviewed | USGS → |
On February 28, 2023, worldwide seismic activity registered a magnitude 2.7 earthquake 92 km W of Adak, Alaska at 22:49 UTC. Coming 1 hours after a magnitude 3.5 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-02-28 2023-02-28 22:43:38 UTC | 3.4ml | 91 km W of Adak, Alaska 51.868°, -177.964° | 9.4 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 3.4 earthquake 91 km W of Adak, Alaska at 22:43 UTC on February 28, 2023. Coming 1 hours after a magnitude 3.5 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M3.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-02-28 2023-02-28 22:41:27 UTC | 3.5ml | 90 km W of Adak, Alaska 51.865°, -177.946° | 8.3 km | - | - | - | ✓ Reviewed | USGS → |
At 22:41 UTC on February 28, 2023, a magnitude 3.5 tremor occurred 90 km W of Adak, Alaska. In the 72 hours after this event, the USGS recorded 37 smaller earthquakes within 20 km, consistent with an ongoing aftershock sequence rooted here. See the M3.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-02-28 2023-02-28 22:08:33 UTC | 2.3md | 21km SSE of Burney, CA 40.723°, -121.529° | 6.3 km | - | - | - | ✓ Reviewed | USGS → |
At 22:08 UTC on February 28, 2023, a magnitude 2.3 tremor occurred 21km SSE of Burney, CA. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-02-28 2023-02-28 22:06:49 UTC | 4.5mb | Molucca Sea 2.700°, 126.531° | 45.3 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.5 earthquake near Molucca Sea at 22:06 UTC on February 28, 2023. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-02-28 2023-02-28 22:01:12 UTC | 2.1ml | 92 km W of Adak, Alaska 51.863°, -177.970° | 5.9 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.1 earthquake 92 km W of Adak, Alaska at 22:01 UTC on February 28, 2023. This event falls inside the aftershock decay of a nearby magnitude 2.6 earthquake that occurred about 1 hours earlier. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-02-28 2023-02-28 21:41:02 UTC | 4.1mb | 104 km S of Koshima, Japan 29.290°, 130.533° | 35.7 km | - | - | - | ✓ Reviewed | USGS → |
On February 28, 2023 at 21:41 UTC, a magnitude 4.1 earthquake struck 104 km S of Koshima, Japan. The event was offshore. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-02-28 2023-02-28 21:20:27 UTC | 2.6ml | Andreanof Islands, Aleutian Islands, Alaska 51.872°, -177.995° | 9.8 km | - | - | - | ✓ Reviewed | USGS → |
February 28, 2023 brought a magnitude 2.6 earthquake near Andreanof Islands, Aleutian Islands, Alaska, logged at 21:20 UTC. In the 72 hours after this event, the USGS recorded 43 smaller earthquakes within 20 km, consistent with an ongoing aftershock sequence rooted here. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-02-28 2023-02-28 21:16:28 UTC | 2.1ml | 30 km ESE of Port Heiden, Alaska 56.874°, -158.139° | 2.4 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.1 event was detected 30 km ESE of Port Heiden, Alaska on February 28, 2023, with origin time 21:16 UTC. Coming 13 hours after a magnitude 2.2 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 M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-02-28 2023-02-28 21:07:11 UTC | 2.5md | Puerto Rico region 17.933°, -66.824° | 11.1 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.5 earthquake in the Puerto Rico region with origin time 21:07 UTC on February 28, 2023. Coming 17 hours after a magnitude 2.7 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-02-28 2023-02-28 20:58:45 UTC | 2.7ml | 61 km S of Whites City, New Mexico 31.625°, -104.343° | 6.1 km | - | - | - | ✓ Reviewed | USGS → |
At 20:58 UTC on February 28, 2023, a magnitude 2.7 tremor occurred 61 km S of Whites City, New Mexico. The event was offshore. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-02-28 2023-02-28 20:51:22 UTC | 2.1ml | 52 km E of Port Alsworth, Alaska 60.171°, -153.363° | 147.2 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.1 earthquake 52 km E of Port Alsworth, Alaska came in on February 28, 2023 at 20:51 UTC. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-02-28 2023-02-28 20:43:54 UTC | 2.4ml | 4 km S of P?hala, Hawaii 19.164°, -155.482° | 34.6 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.4 seismic event took place 4 km S of P?hala, Hawaii on February 28, 2023 at 20:43 UTC. Coming 1 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 M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-02-28 2023-02-28 20:26:08 UTC | 2.5md | 13 km ENE of P?hala, Hawaii 19.252°, -155.363° | 31.3 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.5 event was detected 13 km ENE of P?hala, Hawaii on February 28, 2023, with origin time 20:26 UTC. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-02-28 2023-02-28 20:21:17 UTC | 3.0ml | 5km W of Walker, CA 38.516°, -119.532° | 3.8 km | 2 | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 3.0 earthquake 5km W of Walker, CA with origin time 20:21 UTC on February 28, 2023. 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. | ||||||||
2023-02-28 2023-02-28 20:17:50 UTC | 2.7md | Puerto Rico region 17.944°, -66.946° | 10.7 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.7 earthquake in the Puerto Rico region came in on February 28, 2023 at 20:17 UTC. It arrived roughly 16 hours after a larger magnitude 2.7 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. | ||||||||
2023-02-28 2023-02-28 20:11:57 UTC | 4.6mb | 17 km E of Hinatuan, Philippines 8.399°, 126.493° | 79.1 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.6 earthquake was recorded 17 km E of Hinatuan, Philippines on February 28, 2023 at 20:11 UTC. The event was offshore. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-02-28 2023-02-28 20:10:34 UTC | 4.1mb | 71 km NE of Calama, Chile -21.942°, -68.511° | 141.3 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.1 earthquake was recorded 71 km NE of Calama, Chile on February 28, 2023 at 20:10 UTC. The event was offshore. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-02-28 2023-02-28 20:03:08 UTC | 4.6mb | 37 km E of Bitung, Indonesia 1.399°, 125.467° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.6 earthquake 37 km E of Bitung, Indonesia with origin time 20:03 UTC on February 28, 2023. The event was offshore. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-02-28 2023-02-28 19:44:35 UTC | 5.2mww | 36 km S of Iztapa, Guatemala 13.601°, -90.730° | 69.3 km | 10 | - | - | ✓ Reviewed | USGS → |
A magnitude 5.2 earthquake was recorded 36 km S of Iztapa, Guatemala on February 28, 2023 at 19:44 UTC. The event was offshore. See the M5.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-02-28 2023-02-28 19:40:10 UTC | 2.0ml | 30 km ESE of Port Heiden, Alaska 56.879°, -158.142° | 1.0 km | - | - | - | ✓ Reviewed | USGS → |
At 19:40 UTC on February 28, 2023, a magnitude 2.0 tremor occurred 30 km ESE of Port Heiden, Alaska. This event falls inside the aftershock decay of a nearby magnitude 2.2 earthquake that occurred about 11 hours earlier. 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. | ||||||||
2023-02-28 2023-02-28 19:20:35 UTC | 4.1mb | Molucca Sea 1.339°, 125.556° | 50.7 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.1 earthquake near Molucca Sea with origin time 19:20 UTC on February 28, 2023. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-02-28 2023-02-28 19:19:37 UTC | 2.0md | 2 km S of Maria Antonia, Puerto Rico 17.953°, -66.885° | 17.4 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.0 earthquake 2 km S of Maria Antonia, Puerto Rico at 19:19 UTC on February 28, 2023. Coming 15 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 M2.0 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 February 28, 2023. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.