Earthquakes on August 11, 2021
367
EARTHQUAKES on August 11, 2021
24-hour UTC period · USGS data
55 km deep · 153 people felt it
Elevated activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
3
M4.0–4.9
43
M3.0–3.9
11
M2.0–2.9
71
M1.0–1.9
239
Activity Summary
367
Total earthquakes
~250
Daily average
Elevated
Activity level
3
M5.0+ events
Geographic Breakdown
Top Countries (International)
Significant Earthquakes (M4.5+)
7.1
60 km ENE of Pondaguitan, Philippines
17:46 UTC · 55.1 km deep
Felt by 153
5.5
Mariana Islands region
15:02 UTC · 10.0 km deep
5.0
Vanuatu region
04:20 UTC · 10.0 km deep
4.9
92 km E of Pondaguitan, Philippines
19:28 UTC · 50.0 km deep
4.9
South Sandwich Islands region
17:25 UTC · 117.4 km deep
4.9
109 km NNW of Finschhafen, Papua New Guinea
07:34 UTC · 10.0 km deep
4.9
46 km NNW of Gazli, Uzbekistan
07:01 UTC · 10.0 km deep
4.8
113 km ESE of Pondaguitan, Philippines
18:05 UTC · 48.7 km deep
Earthquake Map — August 11, 2021
All Earthquakes — August 11, 2021
Showing 30 of 128 (filtered from 367)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2021-08-11 2021-08-11 23:53:11 UTC | 2.3md | 3 km WSW of Guánica, Puerto Rico 17.962°, -66.939° | 11.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.3 earthquake was recorded 3 km WSW of Guánica, Puerto Rico on August 11, 2021 at 23:53 UTC. It arrived roughly 21 hours after a larger magnitude 3.3 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. | ||||||||
2021-08-11 2021-08-11 23:34:27 UTC | 4.4mb | 119 km ESE of Pondaguitan, Philippines 5.947°, 127.176° | 48.4 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.4 earthquake 119 km ESE of Pondaguitan, Philippines with origin time 23:34 UTC on August 11, 2021. This event falls inside the aftershock decay of a nearby magnitude 4.8 earthquake that occurred about 5 hours earlier. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-11 2021-08-11 23:30:35 UTC | 2.2ml | 187 km SE of Atka, Alaska 50.862°, -172.542° | 2.5 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.2 earthquake 187 km SE of Atka, Alaska with origin time 23:30 UTC on August 11, 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. | ||||||||
2021-08-11 2021-08-11 23:29:24 UTC | 2.4ml | 22 km WNW of Mentone, Texas 31.756°, -103.833° | 6.2 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.4 earthquake 22 km WNW of Mentone, Texas came in on August 11, 2021 at 23:29 UTC. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-11 2021-08-11 23:27:12 UTC | 2.3ml | 31 km WNW of Puako, Hawaii 20.040°, -156.125° | 38.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 11, 2021 at 23:27 UTC, a magnitude 2.3 earthquake struck 31 km WNW of Puako, Hawaii. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-11 2021-08-11 23:13:21 UTC | 2.8ml | 90 km SE of Atka, Alaska 51.723°, -173.130° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.8 earthquake 90 km SE of Atka, Alaska with origin time 23:13 UTC on August 11, 2021. The event was offshore. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-11 2021-08-11 22:23:51 UTC | 2.4ml | 52 km NW of Toyah, Texas 31.601°, -104.234° | 6.2 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.4 seismic event took place 52 km NW of Toyah, Texas on August 11, 2021 at 22:23 UTC. The event was offshore. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-11 2021-08-11 21:53:02 UTC | 4.0mb | 139 km E of Pondaguitan, Philippines 6.221°, 127.430° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
At 21:53 UTC on August 11, 2021, a magnitude 4.0 tremor occurred 139 km E of Pondaguitan, Philippines. The event was offshore. See the M4.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-11 2021-08-11 21:49:42 UTC | 4.4mb | western Indian-Antarctic Ridge -49.180°, 125.059° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 11, 2021, worldwide seismic activity registered a magnitude 4.4 earthquake near western Indian-Antarctic Ridge at 21:49 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-11 2021-08-11 21:48:50 UTC | 2.2md | 27km ESE of Markleeville, CA 38.561°, -119.536° | 4.8 km | - | - | - | ✓ Reviewed | USGS → |
On August 11, 2021 at 21:48 UTC, a magnitude 2.2 earthquake struck 27km ESE of Markleeville, CA. This event falls inside the aftershock decay of a nearby magnitude 2.2 earthquake that occurred about 19 hours earlier. 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. | ||||||||
2021-08-11 2021-08-11 21:48:31 UTC | 4.4mb | 190 km ENE of Saipan, Northern Mariana Islands 15.889°, 147.386° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
At 21:48 UTC on August 11, 2021, a magnitude 4.4 tremor occurred 190 km ENE of Saipan, Northern Mariana Islands. It arrived roughly 7 hours after a larger magnitude 5.5 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. | ||||||||
2021-08-11 2021-08-11 21:46:33 UTC | 2.3ml | 16 km SSE of Honaunau-Napoopoo, Hawaii 19.329°, -155.779° | 9.9 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.3 earthquake 16 km SSE of Honaunau-Napoopoo, Hawaii with origin time 21:46 UTC on August 11, 2021. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-11 2021-08-11 21:42:11 UTC | 2.2md | 4 km S of P?hala, Hawaii 19.163°, -155.476° | 36.4 km | - | - | - | Auto | USGS → |
A magnitude 2.2 earthquake was recorded 4 km S of P?hala, Hawaii on August 11, 2021 at 21:42 UTC. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-11 2021-08-11 21:27:37 UTC | 2.4ml | 3 km SSW of Volcano, Hawaii 19.411°, -155.243° | 2.2 km | 1 | - | - | ✓ Reviewed | USGS → |
This magnitude 2.4 event was detected 3 km SSW of Volcano, Hawaii on August 11, 2021, with origin time 21:27 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.5 earthquake that occurred about 4 hours earlier. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-11 2021-08-11 21:24:43 UTC | 2.2ml | 121 km SE of Perryville, Alaska 55.276°, -157.576° | 12.9 km | - | - | - | ✓ Reviewed | USGS → |
On August 11, 2021, worldwide seismic activity registered a magnitude 2.2 earthquake 121 km SE of Perryville, Alaska at 21:24 UTC. It arrived roughly 3 hours after a larger magnitude 2.5 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. | ||||||||
2021-08-11 2021-08-11 20:53:16 UTC | 4.3mb | 95 km ESE of Pondaguitan, Philippines 6.126°, 127.004° | 67.1 km | - | - | - | ✓ Reviewed | USGS → |
August 11, 2021 brought a magnitude 4.3 earthquake 95 km ESE of Pondaguitan, Philippines, logged at 20:53 UTC. Coming 1 hours after a magnitude 4.9 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-11 2021-08-11 20:44:13 UTC | 2.1ml | 60 km SE of Perryville, Alaska 55.559°, -158.414° | 20.4 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.1 earthquake 60 km SE of Perryville, Alaska with origin time 20:44 UTC on August 11, 2021. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-11 2021-08-11 20:08:14 UTC | 4.4mb | 95 km WSW of Grindavík, Iceland 63.490°, -24.195° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.4 earthquake 95 km WSW of Grindavík, Iceland at 20:08 UTC on August 11, 2021. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-11 2021-08-11 20:06:50 UTC | 4.1mb | 81 km SW of Sandgerði, Iceland 63.602°, -24.047° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 11, 2021 at 20:06 UTC, a magnitude 4.1 earthquake struck 81 km SW of Sandgerði, Iceland. The event was offshore. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-11 2021-08-11 20:06:02 UTC | 4.3mb | south of the Fiji Islands -25.919°, 179.657° | 503.4 km | - | - | - | ✓ Reviewed | USGS → |
On August 11, 2021 at 20:06 UTC, a magnitude 4.3 earthquake struck south of the Fiji Islands. This is the deepest earthquake in the current dataset — a deep-focus event. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-11 2021-08-11 19:54:01 UTC | 2.4ml | 82 km NW of Yakutat, Alaska 60.036°, -140.828° | 6.5 km | - | - | - | ✓ Reviewed | USGS → |
August 11, 2021 brought a magnitude 2.4 earthquake 82 km NW of Yakutat, Alaska, logged at 19:54 UTC. In the 72 hours after this event, the USGS recorded 3 smaller earthquakes within 20 km, consistent with an ongoing aftershock sequence rooted here. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-11 2021-08-11 19:36:28 UTC | 4.2mb | 111 km E of San Pedro de Atacama, Chile -22.940°, -67.119° | 220.9 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.2 earthquake 111 km E of San Pedro de Atacama, Chile at 19:36 UTC on August 11, 2021. The event was offshore. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-11 2021-08-11 19:34:37 UTC | 4.6mb | 255 km N of Puerto Ayora, Ecuador 1.526°, -90.746° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 11, 2021, worldwide seismic activity registered a magnitude 4.6 earthquake 255 km N of Puerto Ayora, Ecuador at 19:34 UTC. The event was offshore. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-11 2021-08-11 19:31:30 UTC | 2.0ml | 15 km N of Atka, Alaska 52.336°, -174.180° | 4.2 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.0 earthquake 15 km N of Atka, Alaska came in on August 11, 2021 at 19:31 UTC. It arrived roughly 10 hours after a larger magnitude 2.3 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 M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-11 2021-08-11 19:28:31 UTC | 4.9mb | 92 km E of Pondaguitan, Philippines 6.200°, 126.997° | 50.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 11, 2021, worldwide seismic activity registered a magnitude 4.9 earthquake 92 km E of Pondaguitan, Philippines at 19:28 UTC. The event was offshore. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-11 2021-08-11 19:27:45 UTC | 3.1ml | 138 km SSE of Perryville, Alaska 54.783°, -158.224° | 21.7 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 3.1 earthquake was recorded 138 km SSE of Perryville, Alaska on August 11, 2021 at 19:27 UTC. See the M3.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-11 2021-08-11 19:25:24 UTC | 4.3mb | 17 km SW of Lupon, Philippines 6.804°, 125.882° | 48.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.3 earthquake was recorded 17 km SW of Lupon, Philippines on August 11, 2021 at 19:25 UTC. The event was offshore. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-11 2021-08-11 19:13:04 UTC | 2.1ml | 13 km NE of Healy, Alaska 63.951°, -148.802° | 112.7 km | - | - | - | ✓ Reviewed | USGS → |
On August 11, 2021, worldwide seismic activity registered a magnitude 2.1 earthquake 13 km NE of Healy, Alaska at 19:13 UTC. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-11 2021-08-11 18:56:30 UTC | 2.1ml | 70 km SE of Perryville, Alaska 55.429°, -158.411° | 24.3 km | - | - | - | ✓ Reviewed | USGS → |
At 18:56 UTC on August 11, 2021, a magnitude 2.1 tremor occurred 70 km SE of Perryville, Alaska. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-11 2021-08-11 18:45:08 UTC | 3.1ml | 50 km W of Cantwell, Alaska 63.420°, -149.950° | 2.5 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 3.1 earthquake 50 km W of Cantwell, Alaska with origin time 18:45 UTC on August 11, 2021. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M3.1 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 11, 2021. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.