Earthquakes on April 4, 2021
202
EARTHQUAKES on April 4, 2021
24-hour UTC period · USGS data
LARGEST: M5.4 — 97 km SW of Altata, Mexico
10 km deep · 2 people felt it
Normal activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
6
M4.0–4.9
28
M3.0–3.9
10
M2.0–2.9
43
M1.0–1.9
115
Activity Summary
202
Total earthquakes
~250
Daily average
Normal
Activity level
6
M5.0+ events
Geographic Breakdown
By US State
Significant Earthquakes (M4.5+)
5.4
97 km SW of Altata, Mexico
18:43 UTC · 10.0 km deep
Felt by 2
5.4
68 km NNW of Khorixas, Namibia
01:41 UTC · 6.0 km deep
Felt by 15
5.2
West Chile Rise
01:20 UTC · 10.0 km deep
Felt by 1
5.1
Kermadec Islands, New Zealand
17:25 UTC · 10.0 km deep
5.0
southern Mid-Atlantic Ridge
16:35 UTC · 10.0 km deep
5.0
central Mid-Atlantic Ridge
11:02 UTC · 10.0 km deep
4.9
Kermadec Islands region
01:37 UTC · 10.0 km deep
4.8
central Mid-Atlantic Ridge
16:54 UTC · 10.0 km deep
Earthquake Map — April 4, 2021
All Earthquakes — April 4, 2021
Showing 30 of 87 (filtered from 202)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2021-04-04 2021-04-04 23:57:12 UTC | 2.5md | 8 km S of Guánica, Puerto Rico 17.893°, -66.906° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.5 seismic event took place 8 km S of Guánica, Puerto Rico on April 4, 2021 at 23:57 UTC. It arrived roughly 20 hours after a larger magnitude 3.1 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-04 2021-04-04 23:53:59 UTC | 2.0md | 7 km WSW of Townsend, Tennessee 35.649°, -83.835° | 12.7 km | 3 | - | - | ✓ Reviewed | USGS → |
This magnitude 2.0 event was detected 7 km WSW of Townsend, Tennessee on April 4, 2021, with origin time 23:53 UTC. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-04 2021-04-04 23:28:31 UTC | 2.3md | 3 km SE of Jobos, Puerto Rico 17.928°, -66.141° | 14.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.3 seismic event took place 3 km SE of Jobos, Puerto Rico on April 4, 2021 at 23:28 UTC. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-04 2021-04-04 23:26:50 UTC | 3.8mb | 22 km W of Saipan, Northern Mariana Islands 15.227°, 145.548° | 171.5 km | - | - | - | ✓ Reviewed | USGS → |
At 23:26 UTC on April 4, 2021, a magnitude 3.8 tremor occurred 22 km W of Saipan, Northern Mariana Islands. The event was offshore. See the M3.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-04 2021-04-04 22:41:41 UTC | 2.2md | 12km NNW of Avenal, CA 36.096°, -120.194° | 8.5 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.2 earthquake 12km NNW of Avenal, CA with origin time 22:41 UTC on April 4, 2021. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-04 2021-04-04 22:10:51 UTC | 2.5ml | 4 km ESE of Wright, Wyoming 43.735°, -105.436° | 0.0 km | - | - | - | ✓ Reviewed | USGS → |
April 4, 2021 brought a magnitude 2.5 earthquake 4 km ESE of Wright, Wyoming, logged at 22:10 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. | ||||||||
2021-04-04 2021-04-04 21:55:50 UTC | 2.0ml | 10 km SSE of Gardendale, Texas 31.938°, -102.331° | 6.3 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.0 seismic event took place 10 km SSE of Gardendale, Texas on April 4, 2021 at 21:55 UTC. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-04 2021-04-04 21:23:53 UTC | 3.0ml | 208 km SE of Chiniak, Alaska 56.272°, -149.880° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On April 4, 2021, worldwide seismic activity registered a magnitude 3.0 earthquake 208 km SE of Chiniak, Alaska at 21:23 UTC. The event was offshore. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-04 2021-04-04 21:21:57 UTC | 4.5mb | 14 km WSW of Hamamatsu, Japan 34.629°, 137.604° | 10.0 km | 1 | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.5 earthquake 14 km WSW of Hamamatsu, Japan with origin time 21:21 UTC on April 4, 2021. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-04 2021-04-04 21:20:18 UTC | 2.0ml | 54 km S of Whites City, New Mexico 31.686°, -104.459° | 6.2 km | - | - | - | ✓ Reviewed | USGS → |
April 4, 2021 brought a magnitude 2.0 earthquake 54 km S of Whites City, New Mexico, logged at 21:20 UTC. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-04 2021-04-04 21:14:44 UTC | 3.3ml | 4km N of Beaumont, CA 33.966°, -116.978° | 13.1 km | 145 | II | - | ✓ Reviewed | USGS → |
A magnitude 3.3 earthquake was recorded 4km N of Beaumont, CA on April 4, 2021 at 21:14 UTC. The event was offshore. See the M3.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-04 2021-04-04 21:14:27 UTC | 4.4mb | 220 km NE of Gisborne, New Zealand -37.567°, -179.896° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.4 earthquake 220 km NE of Gisborne, New Zealand came in on April 4, 2021 at 21:14 UTC. Coming 1 hours after a magnitude 4.6 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-04 2021-04-04 21:11:55 UTC | 2.8ml | 247 km W of Ferndale, California 40.373°, -127.175° | 12.4 km | - | - | - | ✓ Reviewed | USGS → |
At 21:11 UTC on April 4, 2021, a magnitude 2.8 tremor occurred 247 km W of Ferndale, California. The event was offshore. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-04 2021-04-04 21:06:43 UTC | 2.1md | 9 km E of P?hala, Hawaii 19.201°, -155.388° | 31.5 km | - | - | - | Auto | USGS → |
On April 4, 2021 at 21:06 UTC, a magnitude 2.1 earthquake struck 9 km E of P?hala, Hawaii. This event falls inside the aftershock decay of a nearby magnitude 2.2 earthquake that occurred about 16 hours earlier. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-04 2021-04-04 20:59:38 UTC | 4.6mb | 226 km NE of Gisborne, New Zealand -37.424°, -179.930° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.6 seismic event took place 226 km NE of Gisborne, New Zealand on April 4, 2021 at 20:59 UTC. The event was offshore. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-04 2021-04-04 20:51:45 UTC | 3.3ml | 23 km ENE of Wright, Wyoming 43.836°, -105.225° | 0.0 km | - | - | - | ✓ Reviewed | USGS → |
April 4, 2021 brought a magnitude 3.3 earthquake 23 km ENE of Wright, Wyoming, logged at 20:51 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. | ||||||||
2021-04-04 2021-04-04 20:09:52 UTC | 4.2mb | 105 km ENE of Barishal, Pakistan 36.768°, 75.731° | 74.7 km | - | - | - | ✓ Reviewed | USGS → |
April 4, 2021 brought a magnitude 4.2 earthquake 105 km ENE of Barishal, Pakistan, logged at 20:09 UTC. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-04 2021-04-04 20:00:26 UTC | 2.3ml | 8 km NW of Glacier View, Alaska 61.870°, -147.742° | 22.8 km | - | - | - | Auto | USGS → |
Reports of a magnitude 2.3 earthquake 8 km NW of Glacier View, Alaska came in on April 4, 2021 at 20:00 UTC. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-04 2021-04-04 19:55:44 UTC | 2.7md | 7 km ESE of La Parguera, Puerto Rico 17.950°, -66.984° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.7 earthquake 7 km ESE of La Parguera, Puerto Rico at 19:55 UTC on April 4, 2021. It arrived roughly 16 hours after a larger magnitude 3.1 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. | ||||||||
2021-04-04 2021-04-04 19:18:39 UTC | 4.5mb | Vanuatu region -13.920°, 170.572° | 632.7 km | - | - | - | ✓ Reviewed | USGS → |
On April 4, 2021, worldwide seismic activity registered a magnitude 4.5 earthquake in the Vanuatu region at 19:18 UTC. This is the deepest earthquake in the current dataset — a deep-focus event. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-04 2021-04-04 19:07:55 UTC | 4.3mb | 98 km NW of Luwuk, Indonesia -0.355°, 122.130° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.3 earthquake 98 km NW of Luwuk, Indonesia with origin time 19:07 UTC on April 4, 2021. The event was offshore. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-04 2021-04-04 19:03:54 UTC | 2.5ml | 25 km WNW of Stanley, Idaho 44.341°, -115.201° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On April 4, 2021 at 19:03 UTC, a magnitude 2.5 earthquake struck 25 km WNW of Stanley, Idaho. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-04 2021-04-04 18:43:27 UTC | 5.4mww | 97 km SW of Altata, Mexico 24.053°, -108.658° | 10.0 km | 2 | III | green | ✓ Reviewed | USGS → |
On April 4, 2021 at 18:43 UTC, a magnitude 5.4 earthquake struck 97 km SW of Altata, Mexico. The USGS PAGER system assigned a green alert level for this event, signalling no significant casualties or damage expected. It is the largest earthquake currently listed for worldwide seismic activity on April 4, 2021. See the M5.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-04 2021-04-04 18:29:06 UTC | 4.3mb | Kermadec Islands region -29.606°, -176.770° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On April 4, 2021, worldwide seismic activity registered a magnitude 4.3 earthquake in the Kermadec Islands region at 18:29 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-04 2021-04-04 17:58:55 UTC | 2.2md | 13km NNW of San Simeon, CA 35.748°, -121.247° | 5.1 km | 1 | - | - | ✓ Reviewed | USGS → |
This magnitude 2.2 event was detected 13km NNW of San Simeon, CA on April 4, 2021, with origin time 17:58 UTC. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-04 2021-04-04 17:42:54 UTC | 4.4mb | 36 km S of Motomachi, Japan 43.494°, 144.091° | 17.4 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.4 seismic event took place 36 km S of Motomachi, Japan on April 4, 2021 at 17:42 UTC. The event was offshore. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-04 2021-04-04 17:34:12 UTC | 2.1ml | 5 km ENE of P?hala, Hawaii 19.224°, -155.432° | 32.7 km | - | - | - | Auto | USGS → |
Seismographs logged a magnitude 2.1 earthquake 5 km ENE of P?hala, Hawaii with origin time 17:34 UTC on April 4, 2021. It arrived roughly 12 hours after a larger magnitude 2.2 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-04 2021-04-04 17:33:42 UTC | 2.5ml | 85 km N of Karluk, Alaska 58.300°, -154.284° | 83.3 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.5 earthquake was recorded 85 km N of Karluk, Alaska on April 4, 2021 at 17:33 UTC. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-04 2021-04-04 17:32:36 UTC | 2.2md | 2 km ESE of P?hala, Hawaii 19.193°, -155.460° | 36.0 km | - | - | - | Auto | USGS → |
April 4, 2021 brought a magnitude 2.2 earthquake 2 km ESE of P?hala, Hawaii, logged at 17:32 UTC. It arrived roughly 12 hours after a larger magnitude 2.2 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-04 2021-04-04 17:26:56 UTC | 2.0ml | 4 km S of Big Lake, Alaska 61.478°, -149.971° | 32.0 km | - | - | - | Auto | USGS → |
On April 4, 2021 at 17:26 UTC, a magnitude 2.0 earthquake struck 4 km S of Big Lake, Alaska. 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 April 4, 2021. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.