Earthquakes on September 1, 2021
323
EARTHQUAKES on September 1, 2021
24-hour UTC period · USGS data
LARGEST: M5.7 — central Mid-Atlantic Ridge
10 km deep
Elevated activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
8
M4.0–4.9
31
M3.0–3.9
4
M2.0–2.9
71
M1.0–1.9
209
Activity Summary
323
Total earthquakes
~250
Daily average
Elevated
Activity level
8
M5.0+ events
Geographic Breakdown
By US State
Significant Earthquakes (M4.5+)
5.7
central Mid-Atlantic Ridge
13:50 UTC · 10.0 km deep
5.6
86 km WSW of Copiapó, Chile
18:35 UTC · 28.0 km deep
Felt by 22
5.6
South Sandwich Islands region
09:01 UTC · 27.0 km deep
5.4
north of Ascension Island
22:51 UTC · 10.0 km deep
5.4
16 km WNW of Neiafu, Tonga
08:21 UTC · 28.9 km deep
Felt by 2
5.4
West Chile Rise
07:11 UTC · 10.0 km deep
5.2
southeast of the Loyalty Islands
06:33 UTC · 108.8 km deep
Felt by 5
5.1
South Sandwich Islands region
10:02 UTC · 43.3 km deep
Earthquake Map — September 1, 2021
All Earthquakes — September 1, 2021
Showing 30 of 114 (filtered from 323)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2021-09-01 2021-09-01 23:47:37 UTC | 2.7ml | south of Alaska 54.446°, -159.827° | 16.5 km | - | - | - | ✓ Reviewed | USGS → |
September 1, 2021 brought a magnitude 2.7 earthquake south of Alaska, logged at 23:47 UTC. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-01 2021-09-01 23:46:47 UTC | 2.0md | 5 km SSE of P?hala, Hawaii 19.157°, -155.458° | 33.2 km | - | - | - | ✓ Reviewed | USGS → |
At 23:46 UTC on September 1, 2021, a magnitude 2.0 tremor occurred 5 km SSE of P?hala, Hawaii. Coming 23 hours after a magnitude 2.8 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-01 2021-09-01 23:46:06 UTC | 4.2mb | 80 km ENE of Mutsu, Japan 41.441°, 142.158° | 57.9 km | - | - | - | ✓ Reviewed | USGS → |
On September 1, 2021 at 23:46 UTC, a magnitude 4.2 earthquake struck 80 km ENE of Mutsu, Japan. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-01 2021-09-01 23:33:48 UTC | 2.3md | 31km SE of Markleeville, CA 38.521°, -119.508° | 6.3 km | - | - | - | ✓ Reviewed | USGS → |
At 23:33 UTC on September 1, 2021, a magnitude 2.3 tremor occurred 31km SE of Markleeville, CA. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-01 2021-09-01 23:32:32 UTC | 4.3mb | 78 km ESE of Palca, Peru -17.988°, -69.257° | 170.5 km | - | - | - | ✓ Reviewed | USGS → |
At 23:32 UTC on September 1, 2021, a magnitude 4.3 tremor occurred 78 km ESE of Palca, Peru. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-01 2021-09-01 23:28:11 UTC | 2.1ml | 7 km E of P?hala, Hawaii 19.208°, -155.411° | 34.8 km | - | - | - | Auto | USGS → |
Reports of a magnitude 2.1 earthquake 7 km E of P?hala, Hawaii came in on September 1, 2021 at 23:28 UTC. It arrived roughly 23 hours after a larger magnitude 2.8 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. | ||||||||
2021-09-01 2021-09-01 23:28:01 UTC | 2.3ml | 23 km ESE of P?hala, Hawaii 19.101°, -155.280° | 6.9 km | - | - | - | Auto | USGS → |
The USGS recorded this magnitude 2.3 earthquake 23 km ESE of P?hala, Hawaii at 23:28 UTC on September 1, 2021. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-01 2021-09-01 23:14:51 UTC | 4.8mb | South Sandwich Islands region -58.016°, -25.332° | 39.9 km | - | - | - | ✓ Reviewed | USGS → |
September 1, 2021 brought a magnitude 4.8 earthquake in the South Sandwich Islands region, logged at 23:14 UTC. See the M4.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-01 2021-09-01 23:13:35 UTC | 2.6md | 6km S of Livermore, CA 37.624°, -121.772° | 3.9 km | 81 | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.6 earthquake 6km S of Livermore, CA at 23:13 UTC on September 1, 2021. 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. | ||||||||
2021-09-01 2021-09-01 23:07:34 UTC | 4.4mb | 190 km SSW of Merizo Village, Guam 11.819°, 143.721° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
September 1, 2021 brought a magnitude 4.4 earthquake 190 km SSW of Merizo Village, Guam, logged at 23:07 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-01 2021-09-01 22:51:36 UTC | 5.4mww | north of Ascension Island -1.514°, -15.514° | 10.0 km | - | - | green | ✓ Reviewed | USGS → |
On September 1, 2021, worldwide seismic activity registered a magnitude 5.4 earthquake north of Ascension Island at 22:51 UTC. The USGS PAGER system assigned a green alert level for this event, signalling no significant casualties or damage expected. See the M5.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-01 2021-09-01 22:08:32 UTC | 2.0ml | 56 km S of Whites City, New Mexico 31.671°, -104.398° | 7.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.0 seismic event took place 56 km S of Whites City, New Mexico on September 1, 2021 at 22:08 UTC. It arrived roughly 12 hours after a larger magnitude 2.6 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-01 2021-09-01 22:07:40 UTC | 2.5ml | 23 km WNW of Stanley, Idaho 44.318°, -115.198° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
September 1, 2021 brought a magnitude 2.5 earthquake 23 km WNW of Stanley, Idaho, logged at 22:07 UTC. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-01 2021-09-01 22:06:24 UTC | 2.3ml | 22 km ENE of Alpine, Texas 30.401°, -103.430° | 14.0 km | - | - | - | ✓ Reviewed | USGS → |
September 1, 2021 brought a magnitude 2.3 earthquake 22 km ENE of Alpine, Texas, logged at 22:06 UTC. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-01 2021-09-01 21:46:12 UTC | 3.2ml | 46 km ENE of Adak, Alaska 52.052°, -176.019° | 137.0 km | - | - | - | ✓ Reviewed | USGS → |
September 1, 2021 brought a magnitude 3.2 earthquake 46 km ENE of Adak, Alaska, logged at 21:46 UTC. See the M3.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-01 2021-09-01 21:37:51 UTC | 2.3md | 31km ENE of Dardanelle, CA 38.486°, -119.529° | 3.8 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.3 event was detected 31km ENE of Dardanelle, CA on September 1, 2021, with origin time 21:37 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-01 2021-09-01 21:08:37 UTC | 2.1md | 8 km NE of P?hala, Hawaii 19.259°, -155.431° | 30.1 km | - | - | - | Auto | USGS → |
Reports of a magnitude 2.1 earthquake 8 km NE of P?hala, Hawaii came in on September 1, 2021 at 21:08 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.8 earthquake that occurred about 21 hours earlier. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-01 2021-09-01 20:35:04 UTC | 3.0ml | 31 km SSW of Wells, Nevada 40.839°, -115.078° | 14.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 3.0 earthquake was recorded 31 km SSW of Wells, Nevada on September 1, 2021 at 20:35 UTC. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-01 2021-09-01 20:23:38 UTC | 2.3ml | 14 km SSE of Sunnyside, Utah 39.431°, -110.321° | -1.2 km | - | - | - | ✓ Reviewed | USGS → |
On September 1, 2021 at 20:23 UTC, a magnitude 2.3 earthquake struck 14 km SSE of Sunnyside, Utah. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-01 2021-09-01 20:05:35 UTC | 2.3md | Island of Hawaii, Hawaii 19.398°, -155.277° | 0.5 km | - | - | - | Auto | USGS → |
Reports of a magnitude 2.3 earthquake near Island of Hawaii, Hawaii came in on September 1, 2021 at 20:05 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-01 2021-09-01 19:52:42 UTC | 2.7ml | 232 km SSE of False Pass, Alaska 52.888°, -162.210° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On September 1, 2021 at 19:52 UTC, a magnitude 2.7 earthquake struck 232 km SSE of False Pass, Alaska. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-01 2021-09-01 19:41:31 UTC | 2.0ml | 5 km ENE of P?hala, Hawaii 19.215°, -155.424° | 33.6 km | - | - | - | Auto | USGS → |
A magnitude 2.0 earthquake was recorded 5 km ENE of P?hala, Hawaii on September 1, 2021 at 19:41 UTC. Coming 19 hours after a magnitude 2.8 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-01 2021-09-01 19:21:48 UTC | 2.6ml | Rat Islands, Aleutian Islands, Alaska 50.995°, 176.779° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.6 event was detected near Rat Islands, Aleutian Islands, Alaska on September 1, 2021, with origin time 19:21 UTC. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-01 2021-09-01 19:17:07 UTC | 4.6mb | 66 km ENE of Namie, Japan 37.721°, 141.687° | 65.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.6 earthquake was recorded 66 km ENE of Namie, Japan on September 1, 2021 at 19:17 UTC. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-01 2021-09-01 19:12:32 UTC | 2.2ml | 37 km W of Nikiski, Alaska 60.722°, -151.968° | 88.6 km | - | - | - | ✓ Reviewed | USGS → |
September 1, 2021 brought a magnitude 2.2 earthquake 37 km W of Nikiski, Alaska, logged at 19:12 UTC. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-01 2021-09-01 18:52:36 UTC | 2.8ml | 9 km NNE of Quinlan, Oklahoma 36.530°, -98.991° | 7.9 km | 1 | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.8 earthquake 9 km NNE of Quinlan, Oklahoma came in on September 1, 2021 at 18:52 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 M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-01 2021-09-01 18:35:45 UTC | 5.6mww | 86 km WSW of Copiapó, Chile -27.732°, -71.108° | 28.0 km | 22 | V | green | ✓ Reviewed | USGS → |
A magnitude 5.6 earthquake was recorded 86 km WSW of Copiapó, Chile on September 1, 2021 at 18:35 UTC. The USGS PAGER system assigned a green alert level for this event, signalling no significant casualties or damage expected. See the M5.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-01 2021-09-01 18:02:01 UTC | 2.0ml | 9 km NNE of Quinlan, Oklahoma 36.531°, -98.990° | 8.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.0 earthquake 9 km NNE of Quinlan, Oklahoma with origin time 18:02 UTC on September 1, 2021. In the 72 hours after this event, the USGS recorded 5 smaller earthquakes within 20 km, consistent with an ongoing aftershock sequence rooted here. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-01 2021-09-01 17:53:40 UTC | 2.5ml | 60 km N of Petersville, Alaska 63.036°, -150.700° | 120.5 km | - | - | - | ✓ Reviewed | USGS → |
On September 1, 2021 at 17:53 UTC, a magnitude 2.5 earthquake struck 60 km N of Petersville, Alaska. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-01 2021-09-01 17:52:40 UTC | 2.4ml | 14 km NE of Jal, New Mexico 32.214°, -103.091° | 3.2 km | - | - | - | ✓ Reviewed | USGS → |
At 17:52 UTC on September 1, 2021, a magnitude 2.4 tremor occurred 14 km NE of Jal, New Mexico. This event falls inside the aftershock decay of a nearby magnitude 2.5 earthquake that occurred about 11 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. | ||||||||
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 1, 2021. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.