Earthquakes on March 15, 2021
318
EARTHQUAKES on March 15, 2021
24-hour UTC period · USGS data
LARGEST: M5.3 — Kermadec Islands region
14 km deep
Elevated activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
5
M4.0–4.9
42
M3.0–3.9
13
M2.0–2.9
78
M1.0–1.9
180
Activity Summary
318
Total earthquakes
~250
Daily average
Elevated
Activity level
5
M5.0+ events
Geographic Breakdown
By US State
Top Countries (International)
Significant Earthquakes (M4.5+)
5.3
Kermadec Islands region
19:28 UTC · 14.2 km deep
5.2
Kermadec Islands region
20:44 UTC · 10.0 km deep
5.2
New Britain region, Papua New Guinea
11:41 UTC · 54.0 km deep
Felt by 1
5.1
Kermadec Islands region
21:31 UTC · 10.0 km deep
5.0
4 km ESE of Koga, Japan
19:56 UTC · 56.4 km deep
Felt by 92
4.9
11 km SSW of Elassóna, Greece
15:43 UTC · 10.0 km deep
Felt by 2
4.9
Kermadec Islands region
10:44 UTC · 10.0 km deep
4.9
central Mid-Atlantic Ridge
06:27 UTC · 10.0 km deep
Earthquake Map — March 15, 2021
All Earthquakes — March 15, 2021
Showing 30 of 138 (filtered from 318)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2021-03-15 2021-03-15 23:54:50 UTC | 2.0ml | 62 km NNW of Yakutat, Alaska 60.051°, -140.220° | 12.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.0 event was detected 62 km NNW of Yakutat, Alaska on March 15, 2021, with origin time 23:54 UTC. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-03-15 2021-03-15 23:32:56 UTC | 4.0mb | 95 km NW of Kandrian, Papua New Guinea -5.684°, 148.857° | 170.4 km | - | - | - | ✓ Reviewed | USGS → |
At 23:32 UTC on March 15, 2021, a magnitude 4.0 tremor occurred 95 km NW of Kandrian, Papua New Guinea. The event was offshore. See the M4.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-03-15 2021-03-15 23:29:13 UTC | 2.7ml | Chukotskiy Avtonomnyy Okrug, Russia 66.056°, -173.213° | 18.2 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.7 event was detected near Chukotskiy Avtonomnyy Okrug, Russia on March 15, 2021, with origin time 23:29 UTC. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-03-15 2021-03-15 23:27:29 UTC | 2.2md | 12 km SSE of P?hala, Hawaii 19.103°, -155.433° | 38.5 km | - | - | - | Auto | USGS → |
This magnitude 2.2 event was detected 12 km SSE of P?hala, Hawaii on March 15, 2021, with origin time 23:27 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.4 earthquake that occurred about 13 hours earlier. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-03-15 2021-03-15 23:26:55 UTC | 2.0ml | 5 km N of Ames, Oklahoma 36.295°, -98.184° | 7.9 km | 1 | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.0 earthquake 5 km N of Ames, Oklahoma with origin time 23:26 UTC on March 15, 2021. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-03-15 2021-03-15 23:19:30 UTC | 4.6mb | Volcano Islands, Japan region 22.478°, 143.138° | 162.2 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.6 earthquake in the Volcano Islands, Japan region at 23:19 UTC on March 15, 2021. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-03-15 2021-03-15 22:38:21 UTC | 2.3ml | 2km SE of Frazier Park, CA 34.810°, -118.933° | 13.1 km | - | - | - | ✓ Reviewed | USGS → |
At 22:38 UTC on March 15, 2021, a magnitude 2.3 tremor occurred 2km SE of Frazier Park, CA. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-03-15 2021-03-15 22:30:14 UTC | 2.7ml | 41 km S of Biddle, Montana 44.723°, -105.353° | 0.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.7 earthquake 41 km S of Biddle, Montana came in on March 15, 2021 at 22:30 UTC. 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. | ||||||||
2021-03-15 2021-03-15 22:25:31 UTC | 4.6mb | Kermadec Islands region -28.795°, -176.753° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.6 event was detected in the Kermadec Islands region on March 15, 2021, with origin time 22:25 UTC. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-03-15 2021-03-15 22:22:22 UTC | 2.3ml | 53 km NW of Toyah, Texas 31.593°, -104.249° | 7.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.3 earthquake was recorded 53 km NW of Toyah, Texas on March 15, 2021 at 22:22 UTC. Coming 1 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 M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-03-15 2021-03-15 22:04:11 UTC | 2.4md | 10km SW of Tranquillity, CA 36.594°, -120.342° | 20.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.4 earthquake 10km SW of Tranquillity, CA at 22:04 UTC on March 15, 2021. The event was offshore. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-03-15 2021-03-15 22:00:14 UTC | 2.5ml | 52 km NW of Toyah, Texas 31.595°, -104.242° | 6.5 km | - | - | - | ✓ Reviewed | USGS → |
On March 15, 2021 at 22:00 UTC, a magnitude 2.5 earthquake struck 52 km NW of Toyah, Texas. Coming 1 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 M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-03-15 2021-03-15 21:59:23 UTC | 2.7ml | 52 km NW of Toyah, Texas 31.587°, -104.247° | 6.9 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.7 seismic event took place 52 km NW of Toyah, Texas on March 15, 2021 at 21:59 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. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-03-15 2021-03-15 21:44:22 UTC | 2.4ml | 19 km WNW of Stanley, Idaho 44.279°, -115.171° | 8.8 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.4 event was detected 19 km WNW of Stanley, Idaho on March 15, 2021, with origin time 21:44 UTC. It arrived roughly 10 hours after a larger magnitude 3.0 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-03-15 2021-03-15 21:31:59 UTC | 5.1mww | Kermadec Islands region -29.335°, -176.886° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On March 15, 2021, worldwide seismic activity registered a magnitude 5.1 earthquake in the Kermadec Islands region at 21:31 UTC. It arrived roughly 2 hours after a larger magnitude 5.3 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M5.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-03-15 2021-03-15 21:16:29 UTC | 2.8ml | 211 km SE of Chiniak, Alaska 56.274°, -149.818° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.8 earthquake 211 km SE of Chiniak, Alaska with origin time 21:16 UTC on March 15, 2021. The event was offshore. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-03-15 2021-03-15 20:44:35 UTC | 5.2mww | Kermadec Islands region -29.376°, -176.754° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 5.2 earthquake was recorded in the Kermadec Islands region on March 15, 2021 at 20:44 UTC. This event falls inside the aftershock decay of a nearby magnitude 5.3 earthquake that occurred about 1 hours earlier. See the M5.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-03-15 2021-03-15 20:30:44 UTC | 2.7ml | 63 km ENE of San Vicente, Mexico 31.516°, -115.620° | 4.6 km | - | - | - | ✓ Reviewed | USGS → |
March 15, 2021 brought a magnitude 2.7 earthquake 63 km ENE of San Vicente, Mexico, logged at 20:30 UTC. 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. | ||||||||
2021-03-15 2021-03-15 20:29:24 UTC | 2.1ml | 19 km ESE of Kasilof, Alaska 60.264°, -150.951° | 61.4 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.1 earthquake was recorded 19 km ESE of Kasilof, Alaska on March 15, 2021 at 20:29 UTC. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-03-15 2021-03-15 20:15:36 UTC | 4.5mb | Kermadec Islands region -29.198°, -176.876° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On March 15, 2021, worldwide seismic activity registered a magnitude 4.5 earthquake in the Kermadec Islands region at 20:15 UTC. Coming 1 hours after a magnitude 5.3 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-03-15 2021-03-15 20:07:05 UTC | 2.1ml | 192 km WSW of Yakutat, Alaska 58.684°, -142.647° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.1 earthquake 192 km WSW of Yakutat, Alaska with origin time 20:07 UTC on March 15, 2021. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-03-15 2021-03-15 20:04:44 UTC | 3.9mb | 112 km ENE of Atka, Alaska 52.729°, -172.799° | 211.3 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 3.9 earthquake 112 km ENE of Atka, Alaska came in on March 15, 2021 at 20:04 UTC. See the M3.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-03-15 2021-03-15 19:57:13 UTC | 3.2ml | 33 km WSW of Birney, Montana 45.178°, -106.890° | 0.0 km | - | - | - | ✓ Reviewed | USGS → |
On March 15, 2021 at 19:57 UTC, a magnitude 3.2 earthquake struck 33 km WSW of Birney, Montana. 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. | ||||||||
2021-03-15 2021-03-15 19:56:17 UTC | 5.0mb | 4 km ESE of Koga, Japan 36.174°, 139.770° | 56.4 km | 92 | IV | green | ✓ Reviewed | USGS → |
At 19:56 UTC on March 15, 2021, a magnitude 5.0 tremor occurred 4 km ESE of Koga, Japan. The USGS PAGER system assigned a green alert level for this event, signalling no significant casualties or damage expected. See the M5.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-03-15 2021-03-15 19:34:23 UTC | 2.7ml | 151km SSE of Estacion Coahuila, B.C., MX 31.014°, -114.204° | 9.9 km | - | - | - | ✓ Reviewed | USGS → |
At 19:34 UTC on March 15, 2021, a magnitude 2.7 tremor occurred 151km SSE of Estacion Coahuila, B.C., MX. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-03-15 2021-03-15 19:28:46 UTC | 5.3mww | Kermadec Islands region -29.218°, -176.827° | 14.2 km | - | - | - | ✓ Reviewed | USGS → |
On March 15, 2021 at 19:28 UTC, a magnitude 5.3 earthquake struck in the Kermadec Islands region. 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 M5.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-03-15 2021-03-15 19:25:54 UTC | 2.7ml | 145 km SSE of Sand Point, Alaska 54.151°, -159.548° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On March 15, 2021 at 19:25 UTC, a magnitude 2.7 earthquake struck 145 km SSE of Sand Point, Alaska. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-03-15 2021-03-15 19:07:05 UTC | 2.4ml | Baja California, Mexico 31.508°, -115.662° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
March 15, 2021 brought a magnitude 2.4 earthquake near Baja California, Mexico, logged at 19:07 UTC. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-03-15 2021-03-15 19:06:50 UTC | 2.3ml | 55 km ENE of Port Alsworth, Alaska 60.345°, -153.354° | 160.2 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.3 earthquake 55 km ENE of Port Alsworth, Alaska with origin time 19:06 UTC on March 15, 2021. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-03-15 2021-03-15 18:55:55 UTC | 4.4mb | 24 km NE of Niños Héroes, Mexico 17.570°, -94.315° | 178.9 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.4 seismic event took place 24 km NE of Niños Héroes, Mexico on March 15, 2021 at 18:55 UTC. The event was offshore. See the M4.4 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 15, 2021. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.