Earthquakes on September 28, 2021
278
EARTHQUAKES on September 28, 2021
24-hour UTC period · USGS data
10 km deep · 67 people felt it
Normal activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
2
M4.0–4.9
43
M3.0–3.9
10
M2.0–2.9
52
M1.0–1.9
171
Activity Summary
278
Total earthquakes
~250
Daily average
Normal
Activity level
2
M5.0+ events
Geographic Breakdown
By US State
Significant Earthquakes (M4.5+)
5.3
9 km SW of Arkalochóri, Greece
04:48 UTC · 10.0 km deep
Felt by 67
5.0
108 km WSW of Ternate, Indonesia
06:25 UTC · 14.7 km deep
4.9
south of the Fiji Islands
17:27 UTC · 353.5 km deep
4.9
146 km NE of Colonia, Micronesia
16:26 UTC · 10.0 km deep
Felt by 1
4.8
south of the Fiji Islands
19:41 UTC · 573.8 km deep
4.8
northern Mid-Atlantic Ridge
17:38 UTC · 10.0 km deep
4.7
1 km N of Thrapsanón, Greece
15:13 UTC · 10.0 km deep
Felt by 5
4.7
northern Mid-Atlantic Ridge
10:56 UTC · 10.0 km deep
Earthquake Map — September 28, 2021
All Earthquakes — September 28, 2021
Showing 30 of 107 (filtered from 278)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2021-09-28 2021-09-28 23:47:46 UTC | 3.4ml | 236 km W of Langlois, Oregon 43.236°, -127.320° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
September 28, 2021 brought a magnitude 3.4 earthquake 236 km W of Langlois, Oregon, logged at 23:47 UTC. The event was offshore. See the M3.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-28 2021-09-28 23:17:20 UTC | 4.1mb | 53 km WNW of San Antonio de los Cobres, Argentina -24.019°, -66.797° | 214.6 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.1 earthquake 53 km WNW of San Antonio de los Cobres, Argentina with origin time 23:17 UTC on September 28, 2021. It arrived roughly 1 hours after a larger magnitude 4.3 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-28 2021-09-28 22:43:36 UTC | 4.6mb | South Sandwich Islands region -59.692°, -26.220° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
On September 28, 2021 at 22:43 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. | ||||||||
2021-09-28 2021-09-28 22:25:56 UTC | 2.1ml | 6 km SE of Snowville, Utah 41.923°, -112.663° | -1.8 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.1 earthquake 6 km SE of Snowville, Utah came in on September 28, 2021 at 22:25 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 M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-28 2021-09-28 22:23:41 UTC | 2.4md | 13km SSE of Bodie, CA 38.105°, -118.950° | 13.1 km | 1 | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.4 earthquake 13km SSE of Bodie, CA at 22:23 UTC on September 28, 2021. It arrived roughly 10 hours after a larger magnitude 2.5 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-28 2021-09-28 22:08:42 UTC | 4.3mb | 72 km WNW of San Antonio de los Cobres, Argentina -23.951°, -66.966° | 221.6 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.3 earthquake 72 km WNW of San Antonio de los Cobres, Argentina at 22:08 UTC on September 28, 2021. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-28 2021-09-28 21:55:14 UTC | 2.7ml | 21 km NE of Stanley, Idaho 44.330°, -114.727° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.7 earthquake was recorded 21 km NE of Stanley, Idaho on September 28, 2021 at 21:55 UTC. The event was offshore. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-28 2021-09-28 21:37:09 UTC | 2.7ml | 52 km E of Juneau, Alaska 58.347°, -133.530° | 5.0 km | 1 | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.7 earthquake 52 km E of Juneau, Alaska with origin time 21:37 UTC on September 28, 2021. Coming 4 hours after a magnitude 3.3 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. | ||||||||
2021-09-28 2021-09-28 21:03:09 UTC | 2.6ml | 56 km S of Whites City, New Mexico 31.672°, -104.456° | 7.4 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.6 event was detected 56 km S of Whites City, New Mexico on September 28, 2021, with origin time 21:03 UTC. It arrived roughly 17 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. | ||||||||
2021-09-28 2021-09-28 20:57:45 UTC | 3.0ml | 26 km WSW of Trapper Creek, Alaska 62.204°, -150.689° | 0.0 km | 2 | - | - | Auto | USGS → |
On September 28, 2021, worldwide seismic activity registered a magnitude 3.0 earthquake 26 km WSW of Trapper Creek, Alaska at 20:57 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-28 2021-09-28 20:50:46 UTC | 4.4mb | 19 km NNW of Lloque, Peru -16.177°, -70.815° | 143.5 km | - | - | - | ✓ Reviewed | USGS → |
September 28, 2021 brought a magnitude 4.4 earthquake 19 km NNW of Lloque, Peru, logged at 20:50 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-28 2021-09-28 20:45:08 UTC | 2.6ml | 38 km SE of McGrath, Alaska 62.691°, -155.110° | 1.7 km | - | - | - | Auto | USGS → |
Reports of a magnitude 2.6 earthquake 38 km SE of McGrath, Alaska came in on September 28, 2021 at 20:45 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-28 2021-09-28 20:29:44 UTC | 4.5mb | 142 km NE of Colonia, Micronesia 10.542°, 138.913° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On September 28, 2021, worldwide seismic activity registered a magnitude 4.5 earthquake 142 km NE of Colonia, Micronesia at 20:29 UTC. This event falls inside the aftershock decay of a nearby magnitude 4.9 earthquake that occurred about 4 hours earlier. The event was offshore. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-28 2021-09-28 19:54:10 UTC | 2.9ml | 5 km S of P?hala, Hawaii 19.157°, -155.485° | 33.4 km | 2 | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.9 earthquake 5 km S of P?hala, Hawaii at 19:54 UTC on September 28, 2021. The event was offshore. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-28 2021-09-28 19:41:18 UTC | 3.2ml | 4km NNW of Cholame, CA 35.759°, -120.310° | 3.8 km | 4 | - | - | ✓ Reviewed | USGS → |
A magnitude 3.2 earthquake was recorded 4km NNW of Cholame, CA on September 28, 2021 at 19:41 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. | ||||||||
2021-09-28 2021-09-28 19:41:03 UTC | 4.8mb | south of the Fiji Islands -22.410°, 179.565° | 573.8 km | - | - | - | ✓ Reviewed | USGS → |
At 19:41 UTC on September 28, 2021, a magnitude 4.8 tremor occurred south of the Fiji Islands. This is the deepest earthquake in the current dataset — a deep-focus event. See the M4.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-28 2021-09-28 19:09:59 UTC | 2.3md | 14km S of Bodie, CA 38.081°, -119.022° | 17.8 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.3 earthquake 14km S of Bodie, CA at 19:09 UTC on September 28, 2021. This event falls inside the aftershock decay of a nearby magnitude 2.5 earthquake that occurred about 7 hours earlier. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-28 2021-09-28 19:08:19 UTC | 2.2md | 28km SE of Markleeville, CA 38.544°, -119.533° | 4.7 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.2 earthquake 28km SE of Markleeville, CA at 19:08 UTC on September 28, 2021. Coming 4 hours after a magnitude 3.8 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 M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-28 2021-09-28 19:04:21 UTC | 4.5mb | South Sandwich Islands region -59.400°, -25.627° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
At 19:04 UTC on September 28, 2021, a magnitude 4.5 tremor occurred in the South Sandwich Islands region. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-28 2021-09-28 19:03:48 UTC | 2.3ml | 9 km SSE of Volcano, Hawaii 19.367°, -155.194° | 1.8 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.3 seismic event took place 9 km SSE of Volcano, Hawaii on September 28, 2021 at 19:03 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 M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-28 2021-09-28 18:41:53 UTC | 2.6ml | 4 km ENE of P?hala, Hawaii 19.226°, -155.441° | 42.7 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.6 seismic event took place 4 km ENE of P?hala, Hawaii on September 28, 2021 at 18:41 UTC. Coming 8 hours after a magnitude 2.7 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. | ||||||||
2021-09-28 2021-09-28 18:29:31 UTC | 4.5mb | southern Mid-Atlantic Ridge -47.449°, -11.727° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.5 earthquake near southern Mid-Atlantic Ridge at 18:29 UTC on September 28, 2021. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-28 2021-09-28 18:28:09 UTC | 4.2mb | 171 km SSE of Ust’-Kamchatsk Staryy, Russia 54.768°, 163.335° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.2 event was detected 171 km SSE of Ust’-Kamchatsk Staryy, Russia on September 28, 2021, with origin time 18:28 UTC. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-28 2021-09-28 18:08:04 UTC | 2.5ml | 16 km WSW of Lutak, Alaska 59.261°, -135.804° | 19.9 km | 1 | - | - | Auto | USGS → |
A magnitude 2.5 earthquake was recorded 16 km WSW of Lutak, Alaska on September 28, 2021 at 18:08 UTC. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-28 2021-09-28 17:38:21 UTC | 4.8mb | northern Mid-Atlantic Ridge 32.602°, -40.148° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.8 earthquake near northern Mid-Atlantic Ridge at 17:38 UTC on September 28, 2021. See the M4.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-28 2021-09-28 17:38:05 UTC | 4.3mb | northern Mid-Atlantic Ridge 32.487°, -39.718° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.3 event was detected near northern Mid-Atlantic Ridge on September 28, 2021, with origin time 17:38 UTC. Coming 7 hours after a magnitude 4.4 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. | ||||||||
2021-09-28 2021-09-28 17:33:02 UTC | 2.2ml | 55 km S of Whites City, New Mexico 31.678°, -104.391° | 7.5 km | - | - | - | ✓ Reviewed | USGS → |
On September 28, 2021, worldwide seismic activity registered a magnitude 2.2 earthquake 55 km S of Whites City, New Mexico at 17:33 UTC. It arrived roughly 13 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 M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-28 2021-09-28 17:30:27 UTC | 2.1md | 28km SE of Markleeville, CA 38.544°, -119.535° | 4.8 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.1 earthquake was recorded 28km SE of Markleeville, CA on September 28, 2021 at 17:30 UTC. Coming 2 hours after a magnitude 3.8 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 M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-28 2021-09-28 17:27:01 UTC | 4.9mb | south of the Fiji Islands -24.531°, -178.852° | 353.5 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.9 earthquake south of the Fiji Islands with origin time 17:27 UTC on September 28, 2021. This deep-focus earthquake originated far below the brittle crust, deep inside the mantle. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-28 2021-09-28 17:12:53 UTC | 3.3ml | 50 km E of Juneau, Alaska 58.301°, -133.558° | 5.0 km | - | - | - | ✓ Reviewed | USGS → |
On September 28, 2021 at 17:12 UTC, a magnitude 3.3 earthquake struck 50 km E of Juneau, Alaska. The event was offshore. See the M3.3 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 September 28, 2021. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.