Earthquakes on October 28, 2021
308
EARTHQUAKES on October 28, 2021
24-hour UTC period · USGS data
28 km deep · 3 people felt it
Elevated activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
4
M4.0–4.9
17
M3.0–3.9
21
M2.0–2.9
74
M1.0–1.9
192
Activity Summary
308
Total earthquakes
~250
Daily average
Elevated
Activity level
4
M5.0+ events
Geographic Breakdown
Top Countries (International)
Significant Earthquakes (M4.5+)
5.1
95 km SSE of Perryville, Alaska
19:06 UTC · 28.0 km deep
Felt by 3
5.1
196 km NE of Lospalos, Timor Leste
02:32 UTC · 128.1 km deep
5.0
44 km NE of Colonia, Micronesia
23:35 UTC · 10.0 km deep
Felt by 3
5.0
169 km S of ‘Ohonua, Tonga
06:03 UTC · 10.0 km deep
4.8
23 km NE of Biri, Philippines
05:39 UTC · 10.0 km deep
Felt by 4
4.6
106 km ESE of Hihifo, Tonga
22:37 UTC · 10.0 km deep
4.6
100 km W of Panguna, Papua New Guinea
12:28 UTC · 52.7 km deep
4.6
12 km SW of Nabire, Indonesia
04:19 UTC · 36.5 km deep
Earthquake Map — October 28, 2021
All Earthquakes — October 28, 2021
Showing 30 of 116 (filtered from 308)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2021-10-28 2021-10-28 23:59:21 UTC | 4.4mb | 4 km S of Yotsukaid?, Japan 35.609°, 140.173° | 45.9 km | 16 | - | - | ✓ Reviewed | USGS → |
A magnitude 4.4 earthquake was recorded 4 km S of Yotsukaid?, Japan on October 28, 2021 at 23:59 UTC. The event was offshore. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-28 2021-10-28 23:57:55 UTC | 2.2ml | 44 km NW of Toyah, Texas 31.611°, -104.106° | 7.4 km | - | - | - | ✓ Reviewed | USGS → |
On October 28, 2021 at 23:57 UTC, a magnitude 2.2 earthquake struck 44 km NW of Toyah, Texas. Coming 7 hours after a magnitude 2.5 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. | ||||||||
2021-10-28 2021-10-28 23:52:46 UTC | 4.4mb | Chile-Argentina border region -24.206°, -67.353° | 199.1 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.4 earthquake in the Chile-Argentina border region with origin time 23:52 UTC on October 28, 2021. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-28 2021-10-28 23:44:38 UTC | 2.6ml | 18 km W of Denali Park, Alaska 63.750°, -149.288° | 115.6 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.6 earthquake was recorded 18 km W of Denali Park, Alaska on October 28, 2021 at 23:44 UTC. The event was offshore. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-28 2021-10-28 23:44:15 UTC | 2.0md | 15 km SSE of Sunnyside, Utah 39.425°, -110.300° | -2.1 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.0 earthquake was recorded 15 km SSE of Sunnyside, Utah on October 28, 2021 at 23:44 UTC. Coming 18 hours after a magnitude 2.2 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. 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. | ||||||||
2021-10-28 2021-10-28 23:43:56 UTC | 2.0ml | 73 km WNW of Akhiok, Alaska 57.102°, -155.346° | 67.6 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.0 earthquake 73 km WNW of Akhiok, Alaska at 23:43 UTC on October 28, 2021. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-28 2021-10-28 23:35:01 UTC | 5.0mb | 44 km NE of Colonia, Micronesia 9.797°, 138.411° | 10.0 km | 3 | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 5.0 earthquake 44 km NE of Colonia, Micronesia with origin time 23:35 UTC on October 28, 2021. The event was offshore. See the M5.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-28 2021-10-28 23:20:22 UTC | 2.0ml | 73 km SE of Adak, Alaska 51.456°, -175.811° | 23.4 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.0 event was detected 73 km SE of Adak, Alaska on October 28, 2021, with origin time 23:20 UTC. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-28 2021-10-28 23:15:29 UTC | 2.2ml | 6 km ENE of P?hala, Hawaii 19.226°, -155.426° | 31.2 km | - | - | - | Auto | USGS → |
Reports of a magnitude 2.2 earthquake 6 km ENE of P?hala, Hawaii came in on October 28, 2021 at 23:15 UTC. Coming 12 hours after a magnitude 2.4 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. | ||||||||
2021-10-28 2021-10-28 23:10:18 UTC | 2.4ml | 64 km SE of Perryville, Alaska 55.489°, -158.434° | 36.4 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.4 earthquake was recorded 64 km SE of Perryville, Alaska on October 28, 2021 at 23:10 UTC. The event was offshore. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-28 2021-10-28 23:01:59 UTC | 2.0ml | 3km SE of Loma Linda, CA 34.029°, -117.239° | 16.8 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.0 earthquake 3km SE of Loma Linda, CA came in on October 28, 2021 at 23:01 UTC. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-28 2021-10-28 23:00:52 UTC | 2.0ml | 113 km SSE of Sand Point, Alaska 54.427°, -159.689° | 30.3 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.0 seismic event took place 113 km SSE of Sand Point, Alaska on October 28, 2021 at 23:00 UTC. It arrived roughly 1 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. | ||||||||
2021-10-28 2021-10-28 22:47:31 UTC | 2.0ml | 55 km S of Whites City, New Mexico 31.672°, -104.395° | 6.4 km | - | - | - | ✓ Reviewed | USGS → |
October 28, 2021 brought a magnitude 2.0 earthquake 55 km S of Whites City, New Mexico, logged at 22:47 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.4 earthquake that occurred about 9 hours earlier. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-28 2021-10-28 22:43:51 UTC | 2.3ml | 110 km SSE of Sand Point, Alaska 54.449°, -159.738° | 19.3 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.3 earthquake was recorded 110 km SSE of Sand Point, Alaska on October 28, 2021 at 22:43 UTC. Coming 1 hours after a magnitude 3.0 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-28 2021-10-28 22:41:00 UTC | 3.0ml | 103 km SSE of Sand Point, Alaska 54.488°, -159.856° | 19.8 km | - | - | - | ✓ Reviewed | USGS → |
October 28, 2021 brought a magnitude 3.0 earthquake 103 km SSE of Sand Point, Alaska, logged at 22:41 UTC. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-28 2021-10-28 22:37:52 UTC | 4.6mb | 106 km ESE of Hihifo, Tonga -16.172°, -172.826° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.6 earthquake 106 km ESE of Hihifo, Tonga at 22:37 UTC on October 28, 2021. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-28 2021-10-28 22:36:34 UTC | 2.3ml | 107 km SSE of Sand Point, Alaska 54.475°, -159.732° | 22.6 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.3 earthquake 107 km SSE of Sand Point, Alaska with origin time 22:36 UTC on October 28, 2021. It arrived roughly 1 hours after a larger magnitude 2.9 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. | ||||||||
2021-10-28 2021-10-28 22:26:20 UTC | 3.2ml | 11 km SSW of Antelope Valley-Crestview, Wyoming 44.128°, -105.504° | 0.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 3.2 earthquake was recorded 11 km SSW of Antelope Valley-Crestview, Wyoming on October 28, 2021 at 22:26 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. | ||||||||
2021-10-28 2021-10-28 22:22:44 UTC | 2.1ml | 4 km S of P?hala, Hawaii 19.165°, -155.479° | 32.7 km | - | - | - | Auto | USGS → |
On October 28, 2021, worldwide seismic activity registered a magnitude 2.1 earthquake 4 km S of P?hala, Hawaii at 22:22 UTC. It arrived roughly 11 hours after a larger magnitude 2.4 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-28 2021-10-28 22:21:42 UTC | 2.1md | 7 km NNE of Jenkinsville, South Carolina 34.332°, -81.256° | 4.2 km | - | - | - | ✓ Reviewed | USGS → |
On October 28, 2021 at 22:21 UTC, a magnitude 2.1 earthquake struck 7 km NNE of Jenkinsville, South Carolina. 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. | ||||||||
2021-10-28 2021-10-28 22:08:30 UTC | 2.0ml | 62 km E of Adak, Alaska 51.944°, -175.726° | 74.2 km | - | - | - | ✓ Reviewed | USGS → |
On October 28, 2021 at 22:08 UTC, a magnitude 2.0 earthquake struck 62 km E of Adak, Alaska. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-28 2021-10-28 21:53:46 UTC | 2.1ml | 28 km SSW of Akhiok, Alaska 56.707°, -154.325° | 61.3 km | - | - | - | ✓ Reviewed | USGS → |
At 21:53 UTC on October 28, 2021, a magnitude 2.1 tremor occurred 28 km SSW of Akhiok, Alaska. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-28 2021-10-28 21:48:09 UTC | 2.2md | 4 km E of P?hala, Hawaii 19.203°, -155.435° | 31.0 km | - | - | - | Auto | USGS → |
At 21:48 UTC on October 28, 2021, a magnitude 2.2 tremor occurred 4 km E of P?hala, Hawaii. It arrived roughly 10 hours after a larger magnitude 2.4 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. | ||||||||
2021-10-28 2021-10-28 21:45:35 UTC | 2.2md | 4 km ESE of P?hala, Hawaii 19.190°, -155.439° | 31.5 km | - | - | - | Auto | USGS → |
This magnitude 2.2 event was detected 4 km ESE of P?hala, Hawaii on October 28, 2021, with origin time 21:45 UTC. Coming 10 hours after a magnitude 2.4 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. | ||||||||
2021-10-28 2021-10-28 21:37:06 UTC | 2.9ml | 113 km SSE of Sand Point, Alaska 54.411°, -159.762° | 22.7 km | - | - | - | ✓ Reviewed | USGS → |
At 21:37 UTC on October 28, 2021, a magnitude 2.9 tremor occurred 113 km SSE of Sand Point, Alaska. 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 M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-28 2021-10-28 21:31:21 UTC | 3.6md | 67 km NE of Cruz Bay, U.S. Virgin Islands 18.788°, -64.366° | 12.0 km | 1 | - | - | ✓ Reviewed | USGS → |
At 21:31 UTC on October 28, 2021, a magnitude 3.6 tremor occurred 67 km NE of Cruz Bay, U.S. Virgin Islands. The event was offshore. See the M3.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-28 2021-10-28 21:29:50 UTC | 2.1ml | 66 km SSW of Kaktovik, Alaska 69.579°, -144.261° | 17.6 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.1 earthquake 66 km SSW of Kaktovik, Alaska at 21:29 UTC on October 28, 2021. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-28 2021-10-28 21:12:56 UTC | 2.0ml | 56 km WSW of Tatitlek, Alaska 60.617°, -147.585° | 10.2 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.0 earthquake was recorded 56 km WSW of Tatitlek, Alaska on October 28, 2021 at 21:12 UTC. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-28 2021-10-28 20:57:27 UTC | 3.1ml | 225 km WSW of Adak, Alaska 51.357°, -179.785° | 27.0 km | - | - | - | ✓ Reviewed | USGS → |
At 20:57 UTC on October 28, 2021, a magnitude 3.1 tremor occurred 225 km WSW of Adak, Alaska. See the M3.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-28 2021-10-28 20:49:35 UTC | 2.0md | 15 km SSE of Sunnyside, Utah 39.425°, -110.313° | -1.4 km | - | - | - | ✓ Reviewed | USGS → |
At 20:49 UTC on October 28, 2021, a magnitude 2.0 tremor occurred 15 km SSE of Sunnyside, Utah. Coming 15 hours after a magnitude 2.2 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. 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. | ||||||||
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 October 28, 2021. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.