Earthquakes on August 13, 2021
500
EARTHQUAKES on August 13, 2021
24-hour UTC period · USGS data
LARGEST: M6.1 — South Sandwich Islands region
10 km deep
Elevated activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
45
M4.0–4.9
185
M3.0–3.9
18
M2.0–2.9
82
M1.0–1.9
170
Activity Summary
500
Total earthquakes
~250
Daily average
Elevated
Activity level
45
M5.0+ events
Geographic Breakdown
By US State
Significant Earthquakes (M4.5+)
6.1
South Sandwich Islands region
10:34 UTC · 10.0 km deep
5.9
10 km WNW of Tingloy, Philippines
15:08 UTC · 121.0 km deep
Felt by 32
5.8
South Sandwich Islands region
03:43 UTC · 35.0 km deep
5.7
South Sandwich Islands region
11:45 UTC · 19.0 km deep
5.6
South Sandwich Islands region
06:14 UTC · 10.0 km deep
5.5
southern Mid-Atlantic Ridge
20:15 UTC · 10.0 km deep
5.5
South Sandwich Islands region
20:04 UTC · 10.0 km deep
5.5
Kermadec Islands region
18:46 UTC · 18.2 km deep
Earthquake Map — August 13, 2021
All Earthquakes — August 13, 2021
Showing 30 of 330 (filtered from 500)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2021-08-13 2021-08-13 23:52:50 UTC | 4.9mb | South Sandwich Islands region -60.335°, -27.196° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.9 earthquake in the South Sandwich Islands region at 23:52 UTC on August 13, 2021. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-13 2021-08-13 23:37:54 UTC | 2.9ml | Andreanof Islands, Aleutian Islands, Alaska 51.463°, -176.338° | 33.3 km | - | - | - | ✓ Reviewed | USGS → |
August 13, 2021 brought a magnitude 2.9 earthquake near Andreanof Islands, Aleutian Islands, Alaska, logged at 23:37 UTC. It arrived roughly 6 hours after a larger magnitude 3.1 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-13 2021-08-13 23:32:41 UTC | 5.1mww | South Sandwich Islands region -60.471°, -26.893° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 13, 2021 at 23:32 UTC, a magnitude 5.1 earthquake struck in the South Sandwich Islands region. See the M5.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-13 2021-08-13 23:25:59 UTC | 2.7ml | 192 km SE of Perryville, Alaska 54.707°, -156.962° | 16.9 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.7 event was detected 192 km SE of Perryville, Alaska on August 13, 2021, with origin time 23:25 UTC. The event was offshore. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-13 2021-08-13 23:18:44 UTC | 2.8ml | 26 km S of M?kena, Hawaii 20.415°, -156.416° | 1.4 km | 30 | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.8 earthquake 26 km S of M?kena, Hawaii with origin time 23:18 UTC on August 13, 2021. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-13 2021-08-13 22:54:03 UTC | 4.9mb | South Sandwich Islands region -60.245°, -27.300° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.9 event was detected in the South Sandwich Islands region on August 13, 2021, with origin time 22:54 UTC. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-13 2021-08-13 22:47:53 UTC | 4.9mb | South Sandwich Islands region -60.387°, -27.172° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.9 earthquake in the South Sandwich Islands region came in on August 13, 2021 at 22:47 UTC. Coming 12 hours after a magnitude 6.1 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-13 2021-08-13 22:44:50 UTC | 2.8ml | 21 km WNW of Stanley, Idaho 44.276°, -115.189° | 10.0 km | 1 | - | - | ✓ Reviewed | USGS → |
On August 13, 2021, worldwide seismic activity registered a magnitude 2.8 earthquake 21 km WNW of Stanley, Idaho at 22:44 UTC. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-13 2021-08-13 22:40:59 UTC | 2.2md | 8km WSW of Petrolia, CA 40.311°, -124.376° | 28.7 km | - | - | - | ✓ Reviewed | USGS → |
On August 13, 2021, worldwide seismic activity registered a magnitude 2.2 earthquake 8km WSW of Petrolia, CA at 22:40 UTC. It arrived roughly 18 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. | ||||||||
2021-08-13 2021-08-13 22:36:23 UTC | 4.7mb | South Sandwich Islands region -58.420°, -25.212° | 43.9 km | - | - | - | ✓ Reviewed | USGS → |
On August 13, 2021 at 22:36 UTC, a magnitude 4.7 earthquake struck in the South Sandwich Islands region. This event falls inside the aftershock decay of a nearby magnitude 5.3 earthquake that occurred about 12 hours earlier. See the M4.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-13 2021-08-13 22:34:48 UTC | 4.8mb | northern Mid-Atlantic Ridge 28.238°, -43.967° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.8 seismic event took place near northern Mid-Atlantic Ridge on August 13, 2021 at 22:34 UTC. See the M4.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-13 2021-08-13 22:29:11 UTC | 4.6mb | South Sandwich Islands region -58.172°, -25.016° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
August 13, 2021 brought a magnitude 4.6 earthquake in the South Sandwich Islands region, logged at 22:29 UTC. It arrived roughly 14 hours after a larger magnitude 5.1 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-13 2021-08-13 22:24:49 UTC | 2.7ml | 53 km E of Atka, Alaska 52.251°, -173.426° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.7 earthquake 53 km E of Atka, Alaska came in on August 13, 2021 at 22:24 UTC. Coming 5 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 M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-13 2021-08-13 22:18:07 UTC | 2.2ml | 118 km SSE of Sand Point, Alaska 54.440°, -159.510° | 19.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.2 earthquake 118 km SSE of Sand Point, Alaska with origin time 22:18 UTC on August 13, 2021. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-13 2021-08-13 22:16:17 UTC | 4.7mb | South Sandwich Islands region -58.362°, -24.671° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.7 earthquake was recorded in the South Sandwich Islands region on August 13, 2021 at 22:16 UTC. See the M4.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-13 2021-08-13 22:10:18 UTC | 4.5mb | South Sandwich Islands region -58.009°, -24.983° | 17.7 km | - | - | - | ✓ Reviewed | USGS → |
At 22:10 UTC on August 13, 2021, a magnitude 4.5 tremor occurred in the South Sandwich Islands region. It arrived roughly 6 hours after a larger magnitude 4.7 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. | ||||||||
2021-08-13 2021-08-13 22:08:13 UTC | 2.0ml | 93 km WSW of Nikolski, Alaska 52.620°, -170.144° | 3.3 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.0 earthquake 93 km WSW of Nikolski, Alaska came in on August 13, 2021 at 22:08 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-13 2021-08-13 22:01:57 UTC | 2.2md | 32km SE of Markleeville, CA 38.505°, -119.514° | 5.5 km | - | - | - | ✓ Reviewed | USGS → |
August 13, 2021 brought a magnitude 2.2 earthquake 32km SE of Markleeville, CA, logged at 22:01 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.2 earthquake that occurred about 19 hours earlier. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-13 2021-08-13 21:55:06 UTC | 2.2ml | 148 km SE of Perryville, Alaska 55.130°, -157.247° | 19.6 km | - | - | - | ✓ Reviewed | USGS → |
On August 13, 2021, worldwide seismic activity registered a magnitude 2.2 earthquake 148 km SE of Perryville, Alaska at 21:55 UTC. Coming 4 hours after a magnitude 3.4 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-13 2021-08-13 21:51:10 UTC | 5.0mb | South Sandwich Islands region -58.242°, -23.523° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 13, 2021, worldwide seismic activity registered a magnitude 5.0 earthquake in the South Sandwich Islands region at 21:51 UTC. See the M5.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-13 2021-08-13 21:50:43 UTC | 4.4mb | South Sandwich Islands region -57.282°, -25.026° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.4 event was detected in the South Sandwich Islands region on August 13, 2021, with origin time 21:50 UTC. Coming 18 hours after a magnitude 5.1 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-13 2021-08-13 21:45:34 UTC | 2.6ml | 161 km SE of Chignik, Alaska 55.105°, -156.922° | 26.1 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.6 earthquake was recorded 161 km SE of Chignik, Alaska on August 13, 2021 at 21:45 UTC. It arrived roughly 15 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 M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-13 2021-08-13 21:45:06 UTC | 4.8mb | 97 km E of Pondaguitan, Philippines 6.207°, 127.047° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
August 13, 2021 brought a magnitude 4.8 earthquake 97 km E of Pondaguitan, Philippines, logged at 21:45 UTC. Coming 3 hours after a magnitude 4.9 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M4.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-13 2021-08-13 21:44:52 UTC | 4.5mb | South Sandwich Islands region -57.623°, -23.812° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.5 earthquake in the South Sandwich Islands region at 21:44 UTC on August 13, 2021. This event falls inside the aftershock decay of a nearby magnitude 5.2 earthquake that occurred about 15 hours earlier. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-13 2021-08-13 21:44:15 UTC | 4.7mb | South Sandwich Islands region -56.897°, -26.702° | 108.1 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.7 earthquake in the South Sandwich Islands region with origin time 21:44 UTC on August 13, 2021. See the M4.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-13 2021-08-13 21:35:56 UTC | 2.1ml | 4 km ENE of Prineville, Oregon 44.307°, -120.783° | -1.5 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.1 seismic event took place 4 km ENE of Prineville, Oregon on August 13, 2021 at 21:35 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. | ||||||||
2021-08-13 2021-08-13 21:25:06 UTC | 2.1ml | 5 km NE of Six Mile, Canada 48.498°, -123.412° | 26.4 km | 3 | - | - | ✓ Reviewed | USGS → |
On August 13, 2021, worldwide seismic activity registered a magnitude 2.1 earthquake 5 km NE of Six Mile, Canada at 21:25 UTC. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-13 2021-08-13 21:22:16 UTC | 2.1ml | 2 km SSE of P?hala, Hawaii 19.178°, -155.471° | 35.6 km | - | - | - | Auto | USGS → |
Reports of a magnitude 2.1 earthquake 2 km SSE of P?hala, Hawaii came in on August 13, 2021 at 21:22 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.0 earthquake that occurred about 15 hours earlier. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-13 2021-08-13 21:20:09 UTC | 4.2mb | 216 km SE of Sarangani, Philippines 4.093°, 126.917° | 91.3 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.2 event was detected 216 km SE of Sarangani, Philippines on August 13, 2021, with origin time 21:20 UTC. The event was offshore. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-13 2021-08-13 21:20:05 UTC | 4.6mb | South Sandwich Islands region -58.486°, -25.123° | 44.4 km | - | - | - | ✓ Reviewed | USGS → |
On August 13, 2021 at 21:20 UTC, a magnitude 4.6 earthquake struck in the South Sandwich Islands region. This event falls inside the aftershock decay of a nearby magnitude 5.3 earthquake that occurred about 11 hours earlier. See the M4.6 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 13, 2021. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.