Earthquakes on April 23, 2021
330
EARTHQUAKES on April 23, 2021
24-hour UTC period · USGS data
495 km deep
Elevated activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
3
M4.0–4.9
46
M3.0–3.9
14
M2.0–2.9
60
M1.0–1.9
207
Activity Summary
330
Total earthquakes
~250
Daily average
Elevated
Activity level
3
M5.0+ events
Geographic Breakdown
By US State
Top Countries (International)
Significant Earthquakes (M4.5+)
5.1
270 km WNW of Haveluloto, Tonga
23:11 UTC · 494.6 km deep
5.0
114 km E of Sarangani, Philippines
18:45 UTC · 27.6 km deep
5.0
South Shetland Islands
14:56 UTC · 10.0 km deep
4.9
central Mid-Atlantic Ridge
22:15 UTC · 10.0 km deep
4.9
south of the Fiji Islands
02:14 UTC · 549.2 km deep
4.8
South Shetland Islands
18:12 UTC · 10.0 km deep
4.8
73 km S of San Francisco del Mar Viejo, Mexico
15:33 UTC · 37.7 km deep
Felt by 2
4.7
74 km SSW of Isangel, Vanuatu
23:46 UTC · 35.0 km deep
Earthquake Map — April 23, 2021
All Earthquakes — April 23, 2021
Showing 30 of 123 (filtered from 330)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2021-04-23 2021-04-23 23:56:07 UTC | 2.2md | 11km NE of New Idria, CA 36.495°, -120.606° | 9.3 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.2 earthquake 11km NE of New Idria, CA at 23:56 UTC on April 23, 2021. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-23 2021-04-23 23:54:49 UTC | 2.5ml | 50 km NW of Elfin Cove, Alaska 58.474°, -137.022° | 3.8 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.5 event was detected 50 km NW of Elfin Cove, Alaska on April 23, 2021, with origin time 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. | ||||||||
2021-04-23 2021-04-23 23:46:06 UTC | 4.7mb | 74 km SSW of Isangel, Vanuatu -20.187°, 169.066° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.7 earthquake 74 km SSW of Isangel, Vanuatu came in on April 23, 2021 at 23:46 UTC. See the M4.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-23 2021-04-23 23:44:53 UTC | 2.4ml | 15 km NW of Stanley, Idaho 44.325°, -115.062° | 12.6 km | - | - | - | ✓ Reviewed | USGS → |
On April 23, 2021, worldwide seismic activity registered a magnitude 2.4 earthquake 15 km NW of Stanley, Idaho at 23:44 UTC. The event was offshore. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-23 2021-04-23 23:17:41 UTC | 2.4ml | 53 km NW of Toyah, Texas 31.635°, -104.213° | 6.6 km | - | - | - | ✓ Reviewed | USGS → |
At 23:17 UTC on April 23, 2021, a magnitude 2.4 tremor occurred 53 km NW of Toyah, Texas. The event was offshore. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-23 2021-04-23 23:11:56 UTC | 5.1mb | 270 km WNW of Haveluloto, Tonga -20.434°, -177.700° | 494.6 km | - | - | - | ✓ Reviewed | USGS → |
On April 23, 2021 at 23:11 UTC, a magnitude 5.1 earthquake struck 270 km WNW of Haveluloto, Tonga. It is the largest earthquake currently listed for worldwide seismic activity on April 23, 2021. See the M5.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-23 2021-04-23 23:09:24 UTC | 4.5mb | 106 km E of Sarangani, Philippines 5.218°, 126.403° | 55.5 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.5 event was detected 106 km E of Sarangani, Philippines on April 23, 2021, with origin time 23:09 UTC. This event falls inside the aftershock decay of a nearby magnitude 5.0 earthquake that occurred about 4 hours earlier. The event was offshore. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-23 2021-04-23 22:38:48 UTC | 4.3mb | Revilla Gigedo Islands region 18.939°, -108.134° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
April 23, 2021 brought a magnitude 4.3 earthquake in the Revilla Gigedo Islands region, logged at 22:38 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-23 2021-04-23 22:15:53 UTC | 4.9mb | central Mid-Atlantic Ridge 7.927°, -37.946° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On April 23, 2021, worldwide seismic activity registered a magnitude 4.9 earthquake near central Mid-Atlantic Ridge at 22:15 UTC. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-23 2021-04-23 21:58:45 UTC | 2.2md | 4 km E of P?hala, Hawaii 19.199°, -155.439° | 36.2 km | - | - | - | Auto | USGS → |
April 23, 2021 brought a magnitude 2.2 earthquake 4 km E of P?hala, Hawaii, logged at 21:58 UTC. It arrived roughly 11 hours after a larger magnitude 2.4 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-23 2021-04-23 21:38:37 UTC | 2.6ml | 102 km WSW of Adak, Alaska 51.406°, -177.907° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.6 earthquake was recorded 102 km WSW of Adak, Alaska on April 23, 2021 at 21:38 UTC. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-23 2021-04-23 21:31:17 UTC | 2.6ml | 160 km S of False Pass, Alaska 53.414°, -163.456° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.6 earthquake 160 km S of False Pass, Alaska with origin time 21:31 UTC on April 23, 2021. The event was offshore. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-23 2021-04-23 21:15:55 UTC | 2.9mb_lg | 14 km NNW of Cawker City, Kansas 39.627°, -98.513° | 5.0 km | 1 | - | - | ✓ Reviewed | USGS → |
At 21:15 UTC on April 23, 2021, a magnitude 2.9 tremor occurred 14 km NNW of Cawker City, Kansas. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-23 2021-04-23 20:56:20 UTC | 2.0md | 3km NNE of Wilkerson, CA 37.299°, -118.367° | 7.2 km | - | - | - | ✓ Reviewed | USGS → |
At 20:56 UTC on April 23, 2021, a magnitude 2.0 tremor occurred 3km NNE of Wilkerson, CA. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-23 2021-04-23 20:53:31 UTC | 2.4md | 3 km ENE of Pole Ojea, Puerto Rico 17.985°, -67.155° | 7.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.4 earthquake was recorded 3 km ENE of Pole Ojea, Puerto Rico on April 23, 2021 at 20:53 UTC. It arrived roughly 18 hours after a larger magnitude 3.3 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. | ||||||||
2021-04-23 2021-04-23 20:38:22 UTC | 4.4mb | 156 km S of Alo, Wallis and Futuna -15.723°, -178.127° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.4 earthquake was recorded 156 km S of Alo, Wallis and Futuna on April 23, 2021 at 20:38 UTC. The event was offshore. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-23 2021-04-23 20:25:46 UTC | 2.0md | 3 km ESE of P?hala, Hawaii 19.194°, -155.447° | 35.8 km | - | - | - | Auto | USGS → |
This magnitude 2.0 event was detected 3 km ESE of P?hala, Hawaii on April 23, 2021, with origin time 20:25 UTC. Coming 10 hours after a magnitude 2.4 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. | ||||||||
2021-04-23 2021-04-23 20:10:40 UTC | 4.6mb | Kermadec Islands region -28.960°, -177.274° | 22.1 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.6 seismic event took place in the Kermadec Islands region on April 23, 2021 at 20:10 UTC. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-23 2021-04-23 20:01:17 UTC | 3.3ml | 15 km E of Wright, Wyoming 43.748°, -105.304° | 0.0 km | - | - | - | ✓ Reviewed | USGS → |
On April 23, 2021, worldwide seismic activity registered a magnitude 3.3 earthquake 15 km E of Wright, Wyoming at 20:01 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M3.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-23 2021-04-23 19:45:29 UTC | 2.2ml | 9 km S of False Pass, Alaska 54.766°, -163.400° | 92.6 km | - | - | - | ✓ Reviewed | USGS → |
On April 23, 2021 at 19:45 UTC, a magnitude 2.2 earthquake struck 9 km S of False Pass, Alaska. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-23 2021-04-23 19:30:16 UTC | 2.1md | 13km W of Toms Place, CA 37.570°, -118.824° | 4.0 km | - | - | - | ✓ Reviewed | USGS → |
April 23, 2021 brought a magnitude 2.1 earthquake 13km W of Toms Place, CA, logged at 19:30 UTC. 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. | ||||||||
2021-04-23 2021-04-23 19:15:40 UTC | 2.0ml | 42km WSW of Rosarito, B.C., MX 32.163°, -117.437° | 7.4 km | - | - | - | ✓ Reviewed | USGS → |
On April 23, 2021, worldwide seismic activity registered a magnitude 2.0 earthquake 42km WSW of Rosarito, B.C., MX at 19:15 UTC. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-23 2021-04-23 18:56:43 UTC | 2.5ml | 47 km SW of Adak, Alaska 51.605°, -177.160° | 24.4 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.5 earthquake 47 km SW of Adak, Alaska came in on April 23, 2021 at 18:56 UTC. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-23 2021-04-23 18:53:35 UTC | 4.6mb | Kermadec Islands region -28.077°, -177.446° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
April 23, 2021 brought a magnitude 4.6 earthquake in the Kermadec Islands region, logged at 18:53 UTC. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-23 2021-04-23 18:53:04 UTC | 4.2mb | 192 km N of Lospalos, Timor Leste -6.779°, 126.966° | 409.1 km | - | - | - | ✓ Reviewed | USGS → |
At 18:53 UTC on April 23, 2021, a magnitude 4.2 tremor occurred 192 km N of Lospalos, Timor Leste. This deep-focus earthquake originated far below the brittle crust, deep inside the mantle. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-23 2021-04-23 18:47:06 UTC | 2.1ml | 19 km SSE of Central, Alaska 65.403°, -144.711° | 1.9 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.1 earthquake 19 km SSE of Central, Alaska with origin time 18:47 UTC on April 23, 2021. 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. | ||||||||
2021-04-23 2021-04-23 18:45:29 UTC | 5.0mww | 114 km E of Sarangani, Philippines 5.219°, 126.484° | 27.6 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 5.0 earthquake was recorded 114 km E of Sarangani, Philippines on April 23, 2021 at 18:45 UTC. The event was offshore. See the M5.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-23 2021-04-23 18:12:50 UTC | 4.8mb | South Shetland Islands -62.419°, -58.550° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.8 earthquake near South Shetland Islands at 18:12 UTC on April 23, 2021. See the M4.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-23 2021-04-23 18:11:07 UTC | 2.5ml | 191 km SSE of Atka, Alaska 50.729°, -172.761° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.5 seismic event took place 191 km SSE of Atka, Alaska on April 23, 2021 at 18:11 UTC. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-23 2021-04-23 17:53:27 UTC | 2.8md | 5 km SE of La Parguera, Puerto Rico 17.945°, -67.000° | 7.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.8 earthquake 5 km SE of La Parguera, Puerto Rico came in on April 23, 2021 at 17:53 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.3 earthquake that occurred about 15 hours earlier. The event was offshore. See the M2.8 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 23, 2021. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.