Earthquakes on August 3, 2021
387
EARTHQUAKES on August 3, 2021
24-hour UTC period · USGS data
LARGEST: M6.1 — Nicobar Islands, India region
10 km deep · 9 people felt it
Elevated activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
13
M4.0–4.9
61
M3.0–3.9
24
M2.0–2.9
69
M1.0–1.9
220
Activity Summary
387
Total earthquakes
~250
Daily average
Elevated
Activity level
13
M5.0+ events
Significant Earthquakes (M4.5+)
6.1
Nicobar Islands, India region
03:42 UTC · 10.0 km deep
Felt by 9
5.8
121 km ENE of Hasaki, Japan
20:33 UTC · 27.0 km deep
Felt by 36
5.8
Nicobar Islands, India region
03:43 UTC · 10.0 km deep
5.5
south of the Fiji Islands
10:23 UTC · 479.5 km deep
5.5
southwest of Africa
06:43 UTC · 10.0 km deep
5.3
Nicobar Islands, India region
03:42 UTC · 10.0 km deep
5.3
Nicobar Islands, India region
01:51 UTC · 10.0 km deep
5.2
off the east coast of Honshu, Japan
20:43 UTC · 10.0 km deep
Felt by 9
Earthquake Map — August 3, 2021
All Earthquakes — August 3, 2021
Showing 30 of 167 (filtered from 387)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2021-08-03 2021-08-03 23:52:27 UTC | 4.4mb | 155 km SW of Nabire, Indonesia -4.316°, 134.472° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 3, 2021 at 23:52 UTC, a magnitude 4.4 earthquake struck 155 km SW of Nabire, Indonesia. The event was offshore. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-03 2021-08-03 23:50:16 UTC | 2.2ml | 6 km ENE of P?hala, Hawaii 19.229°, -155.426° | 31.8 km | - | - | - | Auto | USGS → |
A magnitude 2.2 earthquake was recorded 6 km ENE of P?hala, Hawaii on August 3, 2021 at 23:50 UTC. It arrived roughly 13 hours after a larger magnitude 2.6 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. | ||||||||
2021-08-03 2021-08-03 23:49:27 UTC | 4.2mb | 34 km S of Mandráki, Greece 36.307°, 27.062° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.2 event was detected 34 km S of Mandráki, Greece on August 3, 2021, with origin time 23:49 UTC. Coming 11 hours after a magnitude 5.2 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-03 2021-08-03 23:38:27 UTC | 4.2mb | 88 km ENE of Petropavlovsk-Kamchatsky, Russia 53.302°, 159.892° | 61.1 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.2 earthquake 88 km ENE of Petropavlovsk-Kamchatsky, Russia came in on August 3, 2021 at 23:38 UTC. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-03 2021-08-03 23:36:28 UTC | 4.2mb | 103 km S of San Francisco del Mar Viejo, Mexico 15.293°, -94.668° | 40.5 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.2 seismic event took place 103 km S of San Francisco del Mar Viejo, Mexico on August 3, 2021 at 23:36 UTC. The event was offshore. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-03 2021-08-03 23:31:05 UTC | 3.6ml | 161 km SE of Chignik, Alaska 55.121°, -156.905° | 18.9 km | - | I | - | ✓ Reviewed | USGS → |
This magnitude 3.6 event was detected 161 km SE of Chignik, Alaska on August 3, 2021, with origin time 23:31 UTC. The event was offshore. See the M3.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-03 2021-08-03 23:24:03 UTC | 3.0ml | 128 km NNE of Dawson City, Canada 65.081°, -138.198° | 16.1 km | - | - | - | ✓ Reviewed | USGS → |
At 23:24 UTC on August 3, 2021, a magnitude 3.0 tremor occurred 128 km NNE of Dawson City, Canada. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-03 2021-08-03 23:20:46 UTC | 3.2ml | 164 km S of Cordova, Alaska 59.076°, -145.493° | 0.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 3.2 event was detected 164 km S of Cordova, Alaska on August 3, 2021, with origin time 23:20 UTC. 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. | ||||||||
2021-08-03 2021-08-03 23:13:45 UTC | 2.5ml | 187 km S of Unalaska, Alaska 52.220°, -165.990° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.5 earthquake was recorded 187 km S of Unalaska, Alaska on August 3, 2021 at 23:13 UTC. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-03 2021-08-03 23:07:45 UTC | 2.2md | 2 km SE of P?hala, Hawaii 19.186°, -155.460° | 35.7 km | - | - | - | Auto | USGS → |
On August 3, 2021 at 23:07 UTC, a magnitude 2.2 earthquake struck 2 km SE of P?hala, Hawaii. It arrived roughly 13 hours after a larger magnitude 2.6 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. | ||||||||
2021-08-03 2021-08-03 23:06:31 UTC | 4.3mb | Scotia Sea -60.367°, -49.821° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.3 seismic event took place near Scotia Sea on August 3, 2021 at 23:06 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-03 2021-08-03 23:04:01 UTC | 4.2mb | 99 km SW of Uyuni, Bolivia -21.122°, -67.472° | 194.6 km | - | - | - | ✓ Reviewed | USGS → |
August 3, 2021 brought a magnitude 4.2 earthquake 99 km SW of Uyuni, Bolivia, logged at 23:04 UTC. The event was offshore. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-03 2021-08-03 22:59:44 UTC | 2.2ml | 49 km ESE of Nikolski, Alaska 52.794°, -168.161° | 25.6 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.2 earthquake 49 km ESE of Nikolski, Alaska with origin time 22:59 UTC on August 3, 2021. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-03 2021-08-03 22:52:00 UTC | 2.9md | 12km W of Alder Springs, CA 39.670°, -122.864° | 6.0 km | 2 | - | - | ✓ Reviewed | USGS → |
A magnitude 2.9 seismic event took place 12km W of Alder Springs, CA on August 3, 2021 at 22:52 UTC. The event was offshore. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-03 2021-08-03 22:50:43 UTC | 4.4mb | 35 km S of Mandráki, Greece 36.293°, 27.143° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.4 earthquake was recorded 35 km S of Mandráki, Greece on August 3, 2021 at 22:50 UTC. Coming 10 hours after a magnitude 5.2 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. | ||||||||
2021-08-03 2021-08-03 22:49:06 UTC | 4.5mb | 99 km ENE of Hasaki, Japan 36.177°, 141.788° | 23.5 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.5 earthquake was recorded 99 km ENE of Hasaki, Japan on August 3, 2021 at 22:49 UTC. This event falls inside the aftershock decay of a nearby magnitude 5.0 earthquake that occurred about 12 hours earlier. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-03 2021-08-03 22:46:57 UTC | 2.0md | 7 km E of P?hala, Hawaii 19.196°, -155.412° | 32.7 km | - | - | - | Auto | USGS → |
Seismographs logged a magnitude 2.0 earthquake 7 km E of P?hala, Hawaii with origin time 22:46 UTC on August 3, 2021. It arrived roughly 12 hours after a larger magnitude 2.6 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-03 2021-08-03 22:22:32 UTC | 2.1md | 41km NNE of Toms Place, CA 37.916°, -118.560° | 5.3 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.1 earthquake 41km NNE of Toms Place, CA came in on August 3, 2021 at 22:22 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.3 earthquake that occurred about 3 hours earlier. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-03 2021-08-03 22:10:54 UTC | 4.9mb | 120 km ENE of Hasaki, Japan 36.143°, 142.072° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 3, 2021, worldwide seismic activity registered a magnitude 4.9 earthquake 120 km ENE of Hasaki, Japan at 22:10 UTC. This event falls inside the aftershock decay of a nearby magnitude 5.8 earthquake that occurred about 2 hours earlier. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-03 2021-08-03 21:44:32 UTC | 2.7ml | 82 km SE of Atka, Alaska 51.769°, -173.215° | 20.7 km | - | - | - | ✓ Reviewed | USGS → |
On August 3, 2021 at 21:44 UTC, a magnitude 2.7 earthquake struck 82 km SE of Atka, Alaska. The event was offshore. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-03 2021-08-03 21:40:09 UTC | 2.1ml | 100 km SSE of Sand Point, Alaska 54.552°, -159.708° | 21.9 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.1 earthquake 100 km SSE of Sand Point, Alaska with origin time 21:40 UTC on August 3, 2021. Coming 3 hours after a magnitude 3.3 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-03 2021-08-03 21:29:48 UTC | 2.2ml | 1 km SSE of P?hala, Hawaii 19.191°, -155.473° | 31.0 km | - | - | - | Auto | USGS → |
August 3, 2021 brought a magnitude 2.2 earthquake 1 km SSE of P?hala, Hawaii, logged at 21:29 UTC. Coming 11 hours after a magnitude 2.6 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-03 2021-08-03 21:29:40 UTC | 3.4ml | 171 km SE of Chignik, Alaska 55.129°, -156.619° | 15.2 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 3.4 earthquake was recorded 171 km SE of Chignik, Alaska on August 3, 2021 at 21:29 UTC. The event was offshore. See the M3.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-03 2021-08-03 21:28:23 UTC | 3.2ml | 132 km SE of Atka, Alaska 51.251°, -173.044° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 3.2 earthquake 132 km SE of Atka, Alaska came in on August 3, 2021 at 21:28 UTC. The event was offshore. See the M3.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-03 2021-08-03 21:17:56 UTC | 4.4mb | 125 km ENE of Hasaki, Japan 36.249°, 142.074° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.4 earthquake 125 km ENE of Hasaki, Japan with origin time 21:17 UTC on August 3, 2021. It arrived roughly 1 hours after a larger magnitude 5.8 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-03 2021-08-03 21:04:32 UTC | 4.5mb | 126 km ENE of Hasaki, Japan 36.079°, 142.169° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.5 earthquake 126 km ENE of Hasaki, Japan with origin time 21:04 UTC on August 3, 2021. Coming 1 hours after a magnitude 5.8 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. | ||||||||
2021-08-03 2021-08-03 21:03:51 UTC | 4.1mb | 126 km ENE of Hasaki, Japan 36.221°, 142.103° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.1 seismic event took place 126 km ENE of Hasaki, Japan on August 3, 2021 at 21:03 UTC. Coming 1 hours after a magnitude 5.8 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-03 2021-08-03 20:58:41 UTC | 4.2mb | 140 km ENE of Hasaki, Japan 36.154°, 142.302° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 3, 2021 at 20:58 UTC, a magnitude 4.2 earthquake struck 140 km ENE of Hasaki, Japan. It arrived roughly 1 hours after a larger magnitude 5.8 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-03 2021-08-03 20:56:26 UTC | 2.6ml | 49 km SSE of Nikolski, Alaska 52.525°, -168.585° | 29.8 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.6 event was detected 49 km SSE of Nikolski, Alaska on August 3, 2021, with origin time 20:56 UTC. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-03 2021-08-03 20:53:51 UTC | 4.5mb | 117 km ENE of Hasaki, Japan 36.244°, 141.969° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 3, 2021, worldwide seismic activity registered a magnitude 4.5 earthquake 117 km ENE of Hasaki, Japan at 20:53 UTC. It arrived roughly 1 hours after a larger magnitude 5.2 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M4.5 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 August 3, 2021. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.