Earthquakes on August 28, 2021
369
EARTHQUAKES on August 28, 2021
24-hour UTC period · USGS data
30 km deep · 2 people felt it
Elevated activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
6
M4.0–4.9
37
M3.0–3.9
16
M2.0–2.9
75
M1.0–1.9
235
Activity Summary
369
Total earthquakes
~250
Daily average
Elevated
Activity level
6
M5.0+ events
Geographic Breakdown
Top Countries (International)
Significant Earthquakes (M4.5+)
5.6
119 km SSW of Abepura, Indonesia
12:27 UTC · 30.0 km deep
Felt by 2
5.3
94 km NE of San Pedro de Atacama, Chile
12:57 UTC · 191.6 km deep
Felt by 2
5.3
44 km NE of Al Hoceïma, Morocco
11:20 UTC · 10.0 km deep
Felt by 13
5.3
South Sandwich Islands region
00:22 UTC · 35.0 km deep
5.1
South Sandwich Islands region
20:10 UTC · 51.2 km deep
5.1
South Sandwich Islands region
04:16 UTC · 34.8 km deep
4.9
South Shetland Islands
23:08 UTC · 3.4 km deep
4.9
113 km SSW of Abepura, Indonesia
21:00 UTC · 14.4 km deep
Felt by 1
Earthquake Map — August 28, 2021
All Earthquakes — August 28, 2021
Showing 30 of 134 (filtered from 369)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2021-08-28 2021-08-28 23:15:00 UTC | 2.3ml | 8 km SSW of Willow, Alaska 61.676°, -150.083° | 47.9 km | - | - | - | ✓ Reviewed | USGS → |
On August 28, 2021 at 23:15 UTC, a magnitude 2.3 earthquake struck 8 km SSW of Willow, Alaska. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-28 2021-08-28 23:10:48 UTC | 2.9ml | 11 km SW of Winston, Montana 46.395°, -111.749° | 4.6 km | 4 | - | - | ✓ Reviewed | USGS → |
A magnitude 2.9 earthquake was recorded 11 km SW of Winston, Montana on August 28, 2021 at 23:10 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-28 2021-08-28 23:08:52 UTC | 4.9mb | South Shetland Islands -62.334°, -58.248° | 3.4 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.9 event was detected near South Shetland Islands on August 28, 2021, with origin time 23:08 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-28 2021-08-28 22:56:58 UTC | 4.1mb | 74 km ESE of Pondaguitan, Philippines 6.184°, 126.829° | 78.3 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.1 earthquake 74 km ESE of Pondaguitan, Philippines came in on August 28, 2021 at 22:56 UTC. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-28 2021-08-28 22:36:04 UTC | 4.8mb | 40 km NE of Barkhan, Pakistan 30.198°, 69.759° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.8 earthquake 40 km NE of Barkhan, Pakistan with origin time 22:36 UTC on August 28, 2021. The event was offshore. See the M4.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-28 2021-08-28 22:35:58 UTC | 4.5mb | 123 km SSW of Itoman, Japan 25.155°, 127.063° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.5 earthquake was recorded 123 km SSW of Itoman, Japan on August 28, 2021 at 22:35 UTC. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-28 2021-08-28 22:35:07 UTC | 2.4ml | 8 km N of Stanley, Idaho 44.290°, -114.923° | 16.3 km | - | - | - | ✓ Reviewed | USGS → |
On August 28, 2021, worldwide seismic activity registered a magnitude 2.4 earthquake 8 km N of Stanley, Idaho at 22:35 UTC. The event was offshore. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-28 2021-08-28 22:07:12 UTC | 3.8ml | 4 km ENE of Baradères, Haiti 18.500°, -73.603° | 12.1 km | 1 | - | - | ✓ Reviewed | USGS → |
On August 28, 2021, worldwide seismic activity registered a magnitude 3.8 earthquake 4 km ENE of Baradères, Haiti at 22:07 UTC. See the M3.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-28 2021-08-28 21:59:07 UTC | 2.9ml | 8 km NNE of Hamilton, Washington 48.595°, -121.950° | 0.9 km | 29 | II | - | ✓ Reviewed | USGS → |
On August 28, 2021 at 21:59 UTC, a magnitude 2.9 earthquake struck 8 km NNE of Hamilton, Washington. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-28 2021-08-28 21:58:37 UTC | 4.5mb | 118 km SSW of Itoman, Japan 25.219°, 127.049° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.5 earthquake 118 km SSW of Itoman, Japan with origin time 21:58 UTC on August 28, 2021. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-28 2021-08-28 21:53:55 UTC | 3.1ml | 208 km SE of Chiniak, Alaska 56.274°, -149.873° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
August 28, 2021 brought a magnitude 3.1 earthquake 208 km SE of Chiniak, Alaska, logged at 21:53 UTC. The event was offshore. See the M3.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-28 2021-08-28 21:52:42 UTC | 3.2ml | 233 km SE of Chiniak, Alaska 56.004°, -149.815° | 10.4 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 3.2 earthquake 233 km SE of Chiniak, Alaska came in on August 28, 2021 at 21:52 UTC. The event was offshore. See the M3.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-28 2021-08-28 21:44:28 UTC | 2.1ml | 14 km S of Clam Gulch, Alaska 60.102°, -151.405° | 63.3 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.1 earthquake 14 km S of Clam Gulch, Alaska came in on August 28, 2021 at 21:44 UTC. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-28 2021-08-28 21:15:21 UTC | 2.2ml | 26 km SE of Funny River, Alaska 60.344°, -150.398° | 45.3 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.2 event was detected 26 km SE of Funny River, Alaska on August 28, 2021, with origin time 21:15 UTC. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-28 2021-08-28 21:05:16 UTC | 2.1ml | 17 km ESE of Pleasanton, Texas 28.902°, -98.318° | 6.2 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.1 seismic event took place 17 km ESE of Pleasanton, Texas on August 28, 2021 at 21:05 UTC. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-28 2021-08-28 21:01:09 UTC | 2.6ml | 83 km SW of Adak, Alaska 51.425°, -177.604° | 33.3 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.6 seismic event took place 83 km SW of Adak, Alaska on August 28, 2021 at 21:01 UTC. The event was offshore. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-28 2021-08-28 21:00:15 UTC | 4.9mb | 113 km SSW of Abepura, Indonesia -3.523°, 140.192° | 14.4 km | 1 | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.9 earthquake 113 km SSW of Abepura, Indonesia came in on August 28, 2021 at 21:00 UTC. This event falls inside the aftershock decay of a nearby magnitude 5.6 earthquake that occurred about 9 hours earlier. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-28 2021-08-28 20:53:19 UTC | 2.1ml | 8 km NNE of Hamilton, Washington 48.600°, -121.965° | 2.8 km | 3 | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.1 earthquake 8 km NNE of Hamilton, Washington at 20:53 UTC on August 28, 2021. 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. | ||||||||
2021-08-28 2021-08-28 20:27:15 UTC | 2.0md | 5 km ESE of P?hala, Hawaii 19.190°, -155.427° | 31.3 km | - | - | - | Auto | USGS → |
Reports of a magnitude 2.0 earthquake 5 km ESE of P?hala, Hawaii came in on August 28, 2021 at 20:27 UTC. It arrived roughly 19 hours after a larger magnitude 3.0 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-28 2021-08-28 20:21:47 UTC | 3.5ml | 152 km SE of Perryville, Alaska 54.851°, -157.615° | 16.8 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 3.5 earthquake 152 km SE of Perryville, Alaska at 20:21 UTC on August 28, 2021. The event was offshore. See the M3.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-28 2021-08-28 20:10:12 UTC | 5.1mb | South Sandwich Islands region -59.416°, -25.855° | 51.2 km | - | - | - | ✓ Reviewed | USGS → |
At 20:10 UTC on August 28, 2021, a magnitude 5.1 tremor occurred in the South Sandwich Islands region. See the M5.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-28 2021-08-28 20:06:19 UTC | 3.1ml | 72 km SW of Fort McPherson, Canada 66.918°, -135.881° | 20.5 km | - | - | - | ✓ Reviewed | USGS → |
On August 28, 2021 at 20:06 UTC, a magnitude 3.1 earthquake struck 72 km SW of Fort McPherson, Canada. The event was offshore. See the M3.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-28 2021-08-28 20:04:12 UTC | 2.6md | 6 km SSW of Guánica, Puerto Rico 17.918°, -66.936° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.6 earthquake 6 km SSW of Guánica, Puerto Rico came in on August 28, 2021 at 20:04 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.0 earthquake that occurred about 18 hours earlier. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-28 2021-08-28 19:50:21 UTC | 2.6ml | 257 km SE of Perryville, Alaska 54.050°, -156.749° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
August 28, 2021 brought a magnitude 2.6 earthquake 257 km SE of Perryville, Alaska, logged at 19:50 UTC. The event was offshore. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-28 2021-08-28 19:20:46 UTC | 4.4mb | 119 km ENE of Sishilichengzi, China 42.242°, 87.866° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.4 earthquake 119 km ENE of Sishilichengzi, China came in on August 28, 2021 at 19:20 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-28 2021-08-28 19:20:37 UTC | 4.3mb | 18 km NNW of Dededo Village, Guam 13.664°, 144.753° | 119.7 km | - | - | - | ✓ Reviewed | USGS → |
August 28, 2021 brought a magnitude 4.3 earthquake 18 km NNW of Dededo Village, Guam, logged at 19:20 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-28 2021-08-28 19:15:32 UTC | 3.0ml | 158 km SE of Chignik, Alaska 55.458°, -156.351° | 39.9 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 3.0 earthquake 158 km SE of Chignik, Alaska at 19:15 UTC on August 28, 2021. The event was offshore. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-28 2021-08-28 19:10:38 UTC | 2.7ml | 5 km ENE of P?hala, Hawaii 19.227°, -155.431° | 33.1 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.7 earthquake 5 km ENE of P?hala, Hawaii at 19:10 UTC on August 28, 2021. Coming 18 hours after a magnitude 3.0 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-28 2021-08-28 19:00:39 UTC | 2.5md | 28km SE of Markleeville, CA 38.539°, -119.532° | 4.5 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.5 earthquake 28km SE of Markleeville, CA at 19:00 UTC on August 28, 2021. It arrived roughly 19 hours after a larger magnitude 2.6 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 M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-28 2021-08-28 18:57:40 UTC | 2.6ml | 87 km WSW of Adak, Alaska 51.492°, -177.737° | 32.5 km | - | - | - | ✓ Reviewed | USGS → |
On August 28, 2021 at 18:57 UTC, a magnitude 2.6 earthquake struck 87 km WSW of Adak, Alaska. See the M2.6 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 28, 2021. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.