Earthquakes on August 1, 2021
391
EARTHQUAKES on August 1, 2021
24-hour UTC period · USGS data
LARGEST: M5.6 — 26 km SSW of Mandráki, Greece
10 km deep · 19 people felt it
Elevated activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
3
M4.0–4.9
50
M3.0–3.9
23
M2.0–2.9
110
M1.0–1.9
205
Activity Summary
391
Total earthquakes
~250
Daily average
Elevated
Activity level
3
M5.0+ events
Significant Earthquakes (M4.5+)
5.6
26 km SSW of Mandráki, Greece
04:31 UTC · 10.1 km deep
Felt by 19
5.2
190 km SW of Grindavík, Iceland
10:40 UTC · 10.0 km deep
Felt by 1
5.0
11 km S of Tokoroa, New Zealand
13:04 UTC · 175.2 km deep
Felt by 6
4.9
290 km NE of Fais, Micronesia
20:32 UTC · 10.0 km deep
4.9
125 km WNW of Santa Genoveva de Docordó, Colombia
01:50 UTC · 10.0 km deep
Felt by 3
4.8
33 km ENE of San Fernando, Peru
22:18 UTC · 153.9 km deep
4.8
168 km SW of Grindavík, Iceland
00:51 UTC · 10.0 km deep
4.7
180 km SW of Grindavík, Iceland
13:03 UTC · 10.0 km deep
Earthquake Map — August 1, 2021
All Earthquakes — August 1, 2021
Showing 30 of 186 (filtered from 391)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2021-08-01 2021-08-01 23:44:17 UTC | 2.4ml | 60 km ESE of Pedro Bay, Alaska 59.542°, -153.146° | 99.2 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.4 earthquake 60 km ESE of Pedro Bay, Alaska at 23:44 UTC on August 1, 2021. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-01 2021-08-01 23:27:19 UTC | 4.1mb | 4 km NNE of Petrinja, Croatia 45.470°, 16.316° | 10.0 km | 4 | - | - | ✓ Reviewed | USGS → |
At 23:27 UTC on August 1, 2021, a magnitude 4.1 tremor occurred 4 km NNE of Petrinja, Croatia. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-01 2021-08-01 23:18:04 UTC | 2.3ml | 143 km SE of Perryville, Alaska 55.106°, -157.381° | 55.3 km | - | - | - | ✓ Reviewed | USGS → |
On August 1, 2021 at 23:18 UTC, a magnitude 2.3 earthquake struck 143 km SE of Perryville, Alaska. It arrived roughly 16 hours after a larger magnitude 2.7 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-01 2021-08-01 23:10:29 UTC | 2.1ml | 145 km SE of Perryville, Alaska 55.130°, -157.294° | 1.8 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.1 earthquake was recorded 145 km SE of Perryville, Alaska on August 1, 2021 at 23:10 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.5 earthquake that occurred about 3 hours earlier. 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. | ||||||||
2021-08-01 2021-08-01 22:40:09 UTC | 2.5ml | 30 km WNW of Bavispe, Mexico 30.576°, -109.239° | 14.0 km | - | - | - | ✓ Reviewed | USGS → |
At 22:40 UTC on August 1, 2021, a magnitude 2.5 tremor occurred 30 km WNW of Bavispe, Mexico. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-01 2021-08-01 22:32:45 UTC | 2.1md | 41km NNE of Toms Place, CA 37.914°, -118.558° | 4.9 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.1 earthquake was recorded 41km NNE of Toms Place, CA on August 1, 2021 at 22:32 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. | ||||||||
2021-08-01 2021-08-01 22:24:57 UTC | 2.4ml | 142 km SE of Chignik, Alaska 55.246°, -157.087° | 14.7 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.4 event was detected 142 km SE of Chignik, Alaska on August 1, 2021, with origin time 22:24 UTC. Coming 8 hours after a magnitude 3.9 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. | ||||||||
2021-08-01 2021-08-01 22:18:08 UTC | 4.8mb | 33 km ENE of San Fernando, Peru -8.244°, -74.279° | 153.9 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.8 earthquake 33 km ENE of San Fernando, Peru at 22:18 UTC on August 1, 2021. See the M4.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-01 2021-08-01 22:12:46 UTC | 4.0mb | 283 km SE of Levuka, Fiji -20.099°, -179.047° | 669.5 km | - | - | - | ✓ Reviewed | USGS → |
August 1, 2021 brought a magnitude 4.0 earthquake 283 km SE of Levuka, Fiji, logged at 22:12 UTC. This is the deepest earthquake in the current dataset — a deep-focus event. See the M4.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-01 2021-08-01 21:45:29 UTC | 2.6ml | 107 km SSE of Sand Point, Alaska 54.458°, -159.806° | 12.9 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.6 earthquake 107 km SSE of Sand Point, Alaska at 21:45 UTC on August 1, 2021. Coming 9 hours after a magnitude 3.0 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-01 2021-08-01 21:37:18 UTC | 4.2mb | southeast Indian Ridge -40.101°, 102.500° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.2 earthquake was recorded near southeast Indian Ridge on August 1, 2021 at 21:37 UTC. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-01 2021-08-01 21:35:07 UTC | 3.3ml | 156 km SE of Chignik, Alaska 55.158°, -156.941° | 47.1 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 3.3 earthquake 156 km SE of Chignik, Alaska at 21:35 UTC on August 1, 2021. Coming 7 hours after a magnitude 3.9 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M3.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-01 2021-08-01 21:15:17 UTC | 2.5ml | 168 km SSW of Adak, Alaska 50.566°, -177.852° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.5 earthquake 168 km SSW of Adak, Alaska at 21:15 UTC on August 1, 2021. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-01 2021-08-01 21:09:20 UTC | 2.5ml | 137 km SE of Perryville, Alaska 54.902°, -157.900° | 40.3 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.5 event was detected 137 km SE of Perryville, Alaska on August 1, 2021, with origin time 21:09 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.1 earthquake that occurred about 19 hours earlier. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-01 2021-08-01 21:07:27 UTC | 3.3ml | 5 km ENE of Ka?anik, Kosovo 42.251°, 21.326° | 10.0 km | 10 | - | - | ✓ Reviewed | USGS → |
This magnitude 3.3 event was detected 5 km ENE of Ka?anik, Kosovo on August 1, 2021, with origin time 21:07 UTC. See the M3.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-01 2021-08-01 20:56:51 UTC | 2.2ml | 104 km SSE of Perryville, Alaska 55.026°, -158.616° | 25.9 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.2 seismic event took place 104 km SSE of Perryville, Alaska on August 1, 2021 at 20:56 UTC. It arrived roughly 11 hours after a larger magnitude 3.6 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. | ||||||||
2021-08-01 2021-08-01 20:41:49 UTC | 4.3mb | Vanuatu -17.725°, 168.799° | 138.3 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.3 seismic event took place near Vanuatu on August 1, 2021 at 20:41 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-01 2021-08-01 20:38:15 UTC | 4.6mb | South Sandwich Islands region -56.416°, -25.749° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 1, 2021 at 20:38 UTC, a magnitude 4.6 earthquake struck in the South Sandwich Islands region. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-01 2021-08-01 20:34:33 UTC | 2.0md | 12km WNW of Alder Springs, CA 39.678°, -122.855° | 6.5 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.0 earthquake 12km WNW of Alder Springs, CA at 20:34 UTC on August 1, 2021. This event falls inside the aftershock decay of a nearby magnitude 2.2 earthquake that occurred about 9 hours earlier. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-01 2021-08-01 20:32:57 UTC | 4.9mb | 290 km NE of Fais, Micronesia 11.566°, 142.459° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 1, 2021, worldwide seismic activity registered a magnitude 4.9 earthquake 290 km NE of Fais, Micronesia at 20:32 UTC. The event was offshore. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-01 2021-08-01 20:09:50 UTC | 2.7ml | Rat Islands, Aleutian Islands, Alaska 51.714°, 178.558° | 92.0 km | - | - | - | ✓ Reviewed | USGS → |
August 1, 2021 brought a magnitude 2.7 earthquake near Rat Islands, Aleutian Islands, Alaska, logged at 20:09 UTC. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-01 2021-08-01 20:01:15 UTC | 3.5ml | 155 km SSE of Chignik, Alaska 55.123°, -157.059° | 19.7 km | - | I | - | ✓ Reviewed | USGS → |
A magnitude 3.5 seismic event took place 155 km SSE of Chignik, Alaska on August 1, 2021 at 20:01 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.9 earthquake that occurred about 5 hours earlier. See the M3.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-01 2021-08-01 19:51:52 UTC | 2.6md | Puerto Rico region 17.942°, -67.056° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
At 19:51 UTC on August 1, 2021, a magnitude 2.6 tremor occurred in the Puerto Rico region. This event falls inside the aftershock decay of a nearby magnitude 3.3 earthquake that occurred about 6 hours earlier. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-01 2021-08-01 19:45:50 UTC | 2.2md | 10km WNW of Alder Springs, CA 39.672°, -122.841° | 4.1 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.2 earthquake 10km WNW of Alder Springs, CA came in on August 1, 2021 at 19:45 UTC. It arrived roughly 8 hours after a larger magnitude 2.2 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 M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-01 2021-08-01 19:34:48 UTC | 2.4ml | 72 km SE of Perryville, Alaska 55.428°, -158.376° | 24.8 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.4 earthquake 72 km SE of Perryville, Alaska came in on August 1, 2021 at 19:34 UTC. It arrived roughly 4 hours after a larger magnitude 4.4 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-01 2021-08-01 19:32:24 UTC | 2.8ml | 163 km SE of Chignik, Alaska 55.421°, -156.299° | 41.8 km | - | - | - | ✓ Reviewed | USGS → |
On August 1, 2021, worldwide seismic activity registered a magnitude 2.8 earthquake 163 km SE of Chignik, Alaska at 19:32 UTC. Coming 11 hours after a magnitude 2.9 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-01 2021-08-01 19:04:19 UTC | 4.1mb | 189 km W of Langlois, Oregon 43.218°, -126.739° | 10.0 km | 3 | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.1 earthquake 189 km W of Langlois, Oregon at 19:04 UTC on August 1, 2021. The event was offshore. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-01 2021-08-01 18:27:43 UTC | 2.3md | 31km SE of Markleeville, CA 38.501°, -119.540° | 3.0 km | 1 | - | - | ✓ Reviewed | USGS → |
This magnitude 2.3 event was detected 31km SE of Markleeville, CA on August 1, 2021, with origin time 18:27 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.4 earthquake that occurred about 11 hours earlier. 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. | ||||||||
2021-08-01 2021-08-01 18:26:03 UTC | 2.6ml | 170 km SE of Chignik, Alaska 55.330°, -156.286° | 38.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.6 event was detected 170 km SE of Chignik, Alaska on August 1, 2021, with origin time 18:26 UTC. It arrived roughly 10 hours after a larger magnitude 2.9 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-01 2021-08-01 18:25:04 UTC | 2.3ml | 68 km NNW of Huslia, Alaska 66.230°, -157.157° | 6.7 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.3 earthquake was recorded 68 km NNW of Huslia, Alaska on August 1, 2021 at 18:25 UTC. See the M2.3 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 1, 2021. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.