Earthquakes on April 21, 2023
261
EARTHQUAKES on April 21, 2023
24-hour UTC period · USGS data
21 km deep
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
48
M1.0–1.9
160
Activity Summary
261
Total earthquakes
~250
Daily average
Normal
Activity level
6
M5.0+ events
Significant Earthquakes (M4.5+)
5.9
156 km NW of Tobelo, Indonesia
10:21 UTC · 21.0 km deep
5.7
Mid-Indian Ridge
09:06 UTC · 10.0 km deep
5.5
108 km SE of Birżebbuġa, Malta
22:19 UTC · 13.8 km deep
Felt by 38
5.2
77 km WNW of Neiafu, Tonga
06:18 UTC · 117.4 km deep
Felt by 1
5.0
northern Peru
23:10 UTC · 37.7 km deep
Felt by 1
5.0
63 km E of Kainantu, Papua New Guinea
15:02 UTC · 89.2 km deep
Felt by 3
4.9
Mid-Indian Ridge
06:18 UTC · 10.0 km deep
4.8
154 km NW of Tobelo, Indonesia
11:16 UTC · 48.8 km deep
Earthquake Map — April 21, 2023
All Earthquakes — April 21, 2023
Showing 30 of 101 (filtered from 261)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2023-04-21 2023-04-21 23:54:19 UTC | 2.5ml | 85 km NW of Karluk, Alaska 58.166°, -155.351° | 0.9 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.5 seismic event took place 85 km NW of Karluk, Alaska on April 21, 2023 at 23:54 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-04-21 2023-04-21 23:46:58 UTC | 4.6mb | 129 km E of Nishinoomote, Japan 30.680°, 132.350° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.6 earthquake was recorded 129 km E of Nishinoomote, Japan on April 21, 2023 at 23:46 UTC. The event was offshore. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-04-21 2023-04-21 23:32:08 UTC | 2.8ml | 101 km ESE of Adak, Alaska 51.553°, -175.259° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.8 event was detected 101 km ESE of Adak, Alaska on April 21, 2023, with origin time 23:32 UTC. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-04-21 2023-04-21 23:31:43 UTC | 2.2ml | 132 km ESE of Akutan, Alaska 53.675°, -163.919° | 25.3 km | - | - | - | ✓ Reviewed | USGS → |
On April 21, 2023, worldwide seismic activity registered a magnitude 2.2 earthquake 132 km ESE of Akutan, Alaska at 23:31 UTC. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-04-21 2023-04-21 23:10:40 UTC | 5.0mww | northern Peru -5.080°, -77.330° | 37.7 km | 1 | - | - | ✓ Reviewed | USGS → |
At 23:10 UTC on April 21, 2023, a magnitude 5.0 tremor occurred near northern Peru. See the M5.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-04-21 2023-04-21 23:09:52 UTC | 2.0ml | 139 km WNW of Nunam Iqua, Alaska 63.054°, -167.326° | 2.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.0 earthquake 139 km WNW of Nunam Iqua, Alaska came in on April 21, 2023 at 23:09 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. | ||||||||
2023-04-21 2023-04-21 22:33:57 UTC | 3.4md | Puerto Rico region 19.533°, -65.416° | 68.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 3.4 seismic event took place in the Puerto Rico region on April 21, 2023 at 22:33 UTC. See the M3.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-04-21 2023-04-21 22:20:50 UTC | 3.1ml | 140 km W of Yachats, Oregon 44.152°, -125.851° | 10.0 km | 1 | - | - | ✓ Reviewed | USGS → |
A magnitude 3.1 earthquake was recorded 140 km W of Yachats, Oregon on April 21, 2023 at 22:20 UTC. The event was offshore. See the M3.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-04-21 2023-04-21 22:19:48 UTC | 5.5mww | 108 km SE of Birżebbuġa, Malta 35.026°, 15.219° | 13.8 km | 38 | III | green | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 5.5 earthquake 108 km SE of Birżebbuġa, Malta with origin time 22:19 UTC on April 21, 2023. The USGS PAGER system assigned a green alert level for this event, signalling no significant casualties or damage expected. The event was offshore. See the M5.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-04-21 2023-04-21 22:13:12 UTC | 2.2ml | 4 km NE of Midland, Texas 32.021°, -102.040° | 10.2 km | - | - | - | ✓ Reviewed | USGS → |
At 22:13 UTC on April 21, 2023, a magnitude 2.2 tremor occurred 4 km NE of Midland, Texas. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-04-21 2023-04-21 22:07:29 UTC | 4.1mb | 178 km SE of Vilyuchinsk, Russia 51.613°, 159.898° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.1 earthquake 178 km SE of Vilyuchinsk, Russia at 22:07 UTC on April 21, 2023. The event was offshore. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-04-21 2023-04-21 21:44:07 UTC | 2.2ml | 22 km SSW of Cold Bay, Alaska 55.001°, -162.858° | 123.4 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.2 earthquake 22 km SSW of Cold Bay, Alaska at 21:44 UTC on April 21, 2023. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-04-21 2023-04-21 21:24:53 UTC | 4.4mb | 132 km W of Neiafu, Tonga -18.455°, -175.218° | 224.1 km | - | - | - | ✓ Reviewed | USGS → |
On April 21, 2023, worldwide seismic activity registered a magnitude 4.4 earthquake 132 km W of Neiafu, Tonga at 21:24 UTC. The event was offshore. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-04-21 2023-04-21 21:10:45 UTC | 4.5mb | southwestern Ryukyu Islands, Japan 23.792°, 123.446° | 39.2 km | - | - | - | ✓ Reviewed | USGS → |
At 21:10 UTC on April 21, 2023, a magnitude 4.5 tremor occurred near southwestern Ryukyu Islands, Japan. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-04-21 2023-04-21 20:57:56 UTC | 4.1mb | north of Svalbard 80.829°, -3.737° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.1 event was detected north of Svalbard on April 21, 2023, with origin time 20:57 UTC. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-04-21 2023-04-21 20:40:26 UTC | 4.4mb | 158 km W of Neiafu, Tonga -18.692°, -175.489° | 222.1 km | - | - | - | ✓ Reviewed | USGS → |
At 20:40 UTC on April 21, 2023, a magnitude 4.4 tremor occurred 158 km W of Neiafu, Tonga. The event was offshore. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-04-21 2023-04-21 19:48:19 UTC | 2.3ml | 2 km SSE of P?hala, Hawaii 19.180°, -155.464° | 31.8 km | - | - | - | Auto | USGS → |
On April 21, 2023, worldwide seismic activity registered a magnitude 2.3 earthquake 2 km SSE of P?hala, Hawaii at 19:48 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.6 earthquake that occurred about 17 hours earlier. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-04-21 2023-04-21 18:17:10 UTC | 4.7mb | 81 km NE of Adak, Alaska 52.414°, -175.841° | 170.6 km | 2 | II | - | ✓ Reviewed | USGS → |
April 21, 2023 brought a magnitude 4.7 earthquake 81 km NE of Adak, Alaska, logged at 18:17 UTC. The event was offshore. See the M4.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-04-21 2023-04-21 17:30:31 UTC | 2.5ml | 119 km WSW of Adak, Alaska 51.487°, -178.244° | 33.9 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.5 earthquake 119 km WSW of Adak, Alaska with origin time 17:30 UTC on April 21, 2023. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-04-21 2023-04-21 17:16:45 UTC | 2.1ml | 7 km SW of Volcano, Hawaii 19.385°, -155.279° | 1.5 km | 1 | - | - | ✓ Reviewed | USGS → |
On April 21, 2023 at 17:16 UTC, a magnitude 2.1 earthquake struck 7 km SW of Volcano, Hawaii. It arrived roughly 9 hours after a larger magnitude 2.4 mainshock in the same 20 km area, placing it within the typical aftershock window. 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. | ||||||||
2023-04-21 2023-04-21 17:14:06 UTC | 4.2mb | 169 km SSE of Vilyuchinsk, Russia 51.553°, 159.478° | 36.8 km | - | - | - | ✓ Reviewed | USGS → |
April 21, 2023 brought a magnitude 4.2 earthquake 169 km SSE of Vilyuchinsk, Russia, logged at 17:14 UTC. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-04-21 2023-04-21 16:54:31 UTC | 2.7ml | 34 km E of Nelson Lagoon, Alaska 55.993°, -160.662° | 156.8 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.7 seismic event took place 34 km E of Nelson Lagoon, Alaska on April 21, 2023 at 16:54 UTC. The event was offshore. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-04-21 2023-04-21 16:50:38 UTC | 2.4md | 10km WSW of Williams, CA 39.132°, -122.266° | 0.3 km | - | - | - | ✓ Reviewed | USGS → |
On April 21, 2023 at 16:50 UTC, a magnitude 2.4 earthquake struck 10km WSW of Williams, CA. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-04-21 2023-04-21 16:12:11 UTC | 2.3ml | 45 km NW of Toyah, Texas 31.573°, -104.162° | 7.7 km | - | - | - | ✓ Reviewed | USGS → |
At 16:12 UTC on April 21, 2023, a magnitude 2.3 tremor occurred 45 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 M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-04-21 2023-04-21 16:10:31 UTC | 2.4ml | 45 km NW of Toyah, Texas 31.569°, -104.163° | 8.7 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.4 earthquake was recorded 45 km NW of Toyah, Texas on April 21, 2023 at 16:10 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 M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-04-21 2023-04-21 16:09:55 UTC | 4.5mb | 73 km NE of Yonakuni, Japan 24.983°, 123.456° | 112.7 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.5 earthquake 73 km NE of Yonakuni, Japan at 16:09 UTC on April 21, 2023. The event was offshore. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-04-21 2023-04-21 16:03:44 UTC | 2.2ml | 44 km NW of Toyah, Texas 31.566°, -104.157° | 8.8 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.2 event was detected 44 km NW of Toyah, Texas on April 21, 2023, with origin time 16:03 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 M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-04-21 2023-04-21 15:26:28 UTC | 3.5ml | 273 km SE of Attu Station, Alaska 51.493°, 176.528° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 3.5 earthquake 273 km SE of Attu Station, Alaska came in on April 21, 2023 at 15:26 UTC. The event was offshore. See the M3.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-04-21 2023-04-21 15:22:45 UTC | 4.2mb | 13 km SW of Paratunka, Russia 52.859°, 158.143° | 107.5 km | - | - | - | ✓ Reviewed | USGS → |
On April 21, 2023 at 15:22 UTC, a magnitude 4.2 earthquake struck 13 km SW of Paratunka, Russia. The event was offshore. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-04-21 2023-04-21 15:02:56 UTC | 5.0mb | 63 km E of Kainantu, Papua New Guinea -6.303°, 146.441° | 89.2 km | 3 | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 5.0 earthquake 63 km E of Kainantu, Papua New Guinea at 15:02 UTC on April 21, 2023. The event was offshore. See the M5.0 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 April 21, 2023. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.