Earthquakes on April 21, 2021
297
EARTHQUAKES on April 21, 2021
24-hour UTC period · USGS data
LARGEST: M4.9 — 201 km W of Haveluloto, Tonga
292 km deep
Normal activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
0
M4.0–4.9
44
M3.0–3.9
2
M2.0–2.9
56
M1.0–1.9
195
Activity Summary
297
Total earthquakes
~250
Daily average
Normal
Activity level
0
M5.0+ events
Geographic Breakdown
By US State
Top Countries (International)
Significant Earthquakes (M4.5+)
4.9
201 km W of Haveluloto, Tonga
21:49 UTC · 292.2 km deep
4.8
D'Entrecasteaux Islands region
19:35 UTC · 10.0 km deep
4.8
92 km ESE of Isangel, Vanuatu
10:05 UTC · 10.0 km deep
4.7
92 km W of Dêqên, China
13:28 UTC · 10.0 km deep
4.7
271 km E of Samarai, Papua New Guinea
12:17 UTC · 10.0 km deep
4.6
201 km SE of Port Blair, India
19:34 UTC · 26.1 km deep
4.5
114 km NW of Gizo, Solomon Islands
23:19 UTC · 61.1 km deep
4.5
southeast of the Loyalty Islands
22:31 UTC · 10.0 km deep
Earthquake Map — April 21, 2021
All Earthquakes — April 21, 2021
Showing 30 of 102 (filtered from 297)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2021-04-21 2021-04-21 23:26:36 UTC | 4.1mb | 44 km WNW of Kunduz, Afghanistan 36.884°, 68.392° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
April 21, 2021 brought a magnitude 4.1 earthquake 44 km WNW of Kunduz, Afghanistan, logged at 23:26 UTC. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-21 2021-04-21 23:19:33 UTC | 4.5mb | 114 km NW of Gizo, Solomon Islands -7.353°, 156.131° | 61.1 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.5 event was detected 114 km NW of Gizo, Solomon Islands on April 21, 2021, with origin time 23:19 UTC. The event was offshore. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-21 2021-04-21 23:07:02 UTC | 4.4mb | 275 km E of Samarai, Papua New Guinea -10.280°, 153.153° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.4 earthquake 275 km E of Samarai, Papua New Guinea at 23:07 UTC on April 21, 2021. It arrived roughly 4 hours after a larger magnitude 4.8 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-21 2021-04-21 22:54:38 UTC | 4.2mb | 186 km SSE of Sarangani, Philippines 3.810°, 126.026° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.2 earthquake was recorded 186 km SSE of Sarangani, Philippines on April 21, 2021 at 22:54 UTC. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-21 2021-04-21 22:31:56 UTC | 4.5mb | southeast of the Loyalty Islands -22.696°, 172.757° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.5 earthquake southeast of the Loyalty Islands came in on April 21, 2021 at 22:31 UTC. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-21 2021-04-21 22:29:40 UTC | 2.1md | 23km S of South Dos Palos, CA 36.758°, -120.688° | -0.1 km | 1 | - | - | ✓ Reviewed | USGS → |
On April 21, 2021 at 22:29 UTC, a magnitude 2.1 earthquake struck 23km S of South Dos Palos, CA. 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. | ||||||||
2021-04-21 2021-04-21 21:55:04 UTC | 4.2mb | 6 km NNE of Chicureo Abajo, Chile -33.224°, -70.629° | 64.5 km | 6 | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.2 earthquake 6 km NNE of Chicureo Abajo, Chile with origin time 21:55 UTC on April 21, 2021. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-21 2021-04-21 21:49:47 UTC | 4.9mb | 201 km W of Haveluloto, Tonga -21.030°, -177.148° | 292.2 km | - | - | - | ✓ Reviewed | USGS → |
On April 21, 2021 at 21:49 UTC, a magnitude 4.9 earthquake struck 201 km W of Haveluloto, Tonga. It is the largest earthquake currently listed for worldwide seismic activity on April 21, 2021. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-21 2021-04-21 21:49:29 UTC | 2.3ml | 2 km NW of Ridgeway, Alaska 60.551°, -151.113° | 46.3 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.3 event was detected 2 km NW of Ridgeway, Alaska on April 21, 2021, with origin time 21:49 UTC. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-21 2021-04-21 21:39:16 UTC | 4.0mb | southern Iran 29.590°, 50.493° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.0 earthquake was recorded near southern Iran on April 21, 2021 at 21:39 UTC. See the M4.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-21 2021-04-21 20:54:15 UTC | 2.3ml | 28 km ENE of Honaunau-Napoopoo, Hawaii 19.544°, -155.612° | 8.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.3 earthquake 28 km ENE of Honaunau-Napoopoo, Hawaii with origin time 20:54 UTC on April 21, 2021. It arrived roughly 15 hours after a larger magnitude 2.4 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-21 2021-04-21 20:48:56 UTC | 2.0ml | Kodiak Island region, Alaska 58.028°, -153.560° | 58.1 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.0 earthquake in the Kodiak Island region, Alaska at 20:48 UTC on April 21, 2021. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-21 2021-04-21 20:12:14 UTC | 4.2mb | 61 km SSW of Pagar Alam, Indonesia -4.540°, 103.049° | 66.2 km | - | - | - | ✓ Reviewed | USGS → |
On April 21, 2021, worldwide seismic activity registered a magnitude 4.2 earthquake 61 km SSW of Pagar Alam, Indonesia at 20:12 UTC. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-21 2021-04-21 19:45:11 UTC | 4.3mb | 178 km SE of Port Blair, India 10.455°, 93.820° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
At 19:45 UTC on April 21, 2021, a magnitude 4.3 tremor occurred 178 km SE of Port Blair, India. The event was offshore. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-21 2021-04-21 19:43:51 UTC | 4.5mb | 40 km WSW of Codrington, Antigua and Barbuda 17.522°, -62.200° | 24.8 km | 4 | - | - | ✓ Reviewed | USGS → |
A magnitude 4.5 seismic event took place 40 km WSW of Codrington, Antigua and Barbuda on April 21, 2021 at 19:43 UTC. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-21 2021-04-21 19:39:01 UTC | 4.4mb | 197 km SSE of Port Blair, India 9.930°, 93.177° | 8.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.4 event was detected 197 km SSE of Port Blair, India on April 21, 2021, with origin time 19:39 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-21 2021-04-21 19:35:51 UTC | 4.5mwr | 122 km W of Abra Pampa, Argentina -22.747°, -66.887° | 256.6 km | 1 | - | - | ✓ Reviewed | USGS → |
April 21, 2021 brought a magnitude 4.5 earthquake 122 km W of Abra Pampa, Argentina, logged at 19:35 UTC. The event was offshore. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-21 2021-04-21 19:35:18 UTC | 4.8mb | D'Entrecasteaux Islands region -10.370°, 153.145° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.8 earthquake was recorded in the D'Entrecasteaux Islands region on April 21, 2021 at 19:35 UTC. See the M4.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-21 2021-04-21 19:34:42 UTC | 4.6mb | 201 km SE of Port Blair, India 10.590°, 94.234° | 26.1 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.6 earthquake 201 km SE of Port Blair, India at 19:34 UTC on April 21, 2021. The event was offshore. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-21 2021-04-21 19:24:39 UTC | 2.3md | 6 km SE of Sparta, North Carolina 36.464°, -81.067° | 0.1 km | 35 | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.3 earthquake 6 km SE of Sparta, North Carolina came in on April 21, 2021 at 19:24 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-21 2021-04-21 19:15:25 UTC | 2.0ml | 20 km SE of Livengood, Alaska 65.403°, -148.211° | 14.5 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.0 event was detected 20 km SE of Livengood, Alaska on April 21, 2021, with origin time 19:15 UTC. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-21 2021-04-21 19:07:39 UTC | 2.2md | 5 km SE of P?hala, Hawaii 19.170°, -155.443° | 36.0 km | - | - | - | Auto | USGS → |
This magnitude 2.2 event was detected 5 km SE of P?hala, Hawaii on April 21, 2021, with origin time 19:07 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.0 earthquake that occurred about 7 hours earlier. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-21 2021-04-21 19:04:29 UTC | 4.2mb | 79 km SSW of Kuril’sk, Russia 44.545°, 147.564° | 101.3 km | - | - | - | ✓ Reviewed | USGS → |
At 19:04 UTC on April 21, 2021, a magnitude 4.2 tremor occurred 79 km SSW of Kuril’sk, Russia. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-21 2021-04-21 18:48:59 UTC | 2.0ml | Andreanof Islands, Aleutian Islands, Alaska 51.779°, -175.963° | 69.2 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.0 earthquake near Andreanof Islands, Aleutian Islands, Alaska came in on April 21, 2021 at 18:48 UTC. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-21 2021-04-21 17:32:30 UTC | 2.0md | 2 km NNE of Rincón, Puerto Rico 18.364°, -67.242° | 23.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.0 seismic event took place 2 km NNE of Rincón, Puerto Rico on April 21, 2021 at 17:32 UTC. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-21 2021-04-21 17:10:05 UTC | 4.4mb | 196 km NE of Gisborne, New Zealand -37.414°, 179.596° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.4 earthquake 196 km NE of Gisborne, New Zealand came in on April 21, 2021 at 17:10 UTC. The event was offshore. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-21 2021-04-21 16:59:08 UTC | 2.1ml | 30 km SE of Mina, Nevada 38.167°, -117.911° | 6.8 km | - | - | - | ✓ Reviewed | USGS → |
On April 21, 2021, worldwide seismic activity registered a magnitude 2.1 earthquake 30 km SE of Mina, Nevada at 16:59 UTC. Coming 12 hours after a magnitude 2.6 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-21 2021-04-21 16:42:34 UTC | 2.3md | 30km SSW of Qualeys Camp, NV 38.067°, -118.671° | 2.7 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.3 seismic event took place 30km SSW of Qualeys Camp, NV on April 21, 2021 at 16:42 UTC. Coming 15 hours after a magnitude 2.3 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 M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-21 2021-04-21 16:41:12 UTC | 2.3ml | 52 km NW of Elfin Cove, Alaska 58.495°, -137.024° | 0.0 km | 35 | - | - | ✓ Reviewed | USGS → |
April 21, 2021 brought a magnitude 2.3 earthquake 52 km NW of Elfin Cove, Alaska, logged at 16:41 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-21 2021-04-21 16:38:58 UTC | 2.2ml | 28 km SE of Mammoth, Wyoming 44.766°, -110.488° | 4.8 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.2 earthquake 28 km SE of Mammoth, Wyoming at 16:38 UTC on April 21, 2021. 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. | ||||||||
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, 2021. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.