Earthquakes on August 31, 2021
404
EARTHQUAKES on August 31, 2021
24-hour UTC period · USGS data
LARGEST: M6.4 — Kermadec Islands, New Zealand
16 km deep · 5 people felt it
Elevated activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
10
M4.0–4.9
82
M3.0–3.9
13
M2.0–2.9
68
M1.0–1.9
231
Activity Summary
404
Total earthquakes
~250
Daily average
Elevated
Activity level
10
M5.0+ events
Geographic Breakdown
Top Countries (International)
Significant Earthquakes (M4.5+)
6.4
Kermadec Islands, New Zealand
02:52 UTC · 16.0 km deep
Felt by 5
5.6
South Sandwich Islands region
14:24 UTC · 14.8 km deep
5.4
20 km N of Sola, Vanuatu
13:26 UTC · 10.0 km deep
Felt by 1
5.3
Scotia Sea
22:40 UTC · 10.0 km deep
5.3
Fiji region
10:04 UTC · 550.4 km deep
Felt by 2
5.2
South Sandwich Islands region
06:18 UTC · 52.5 km deep
5.1
19 km W of ?hsaniye, Turkey
11:04 UTC · 10.0 km deep
Felt by 8
5.1
24 km S of Severomuysk, Russia
05:24 UTC · 8.9 km deep
Felt by 2
Earthquake Map — August 31, 2021
All Earthquakes — August 31, 2021
Showing 30 of 173 (filtered from 404)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2021-08-31 2021-08-31 23:36:29 UTC | 2.0ml | 4 km E of P?hala, Hawaii 19.201°, -155.432° | 33.1 km | - | - | - | Auto | USGS → |
The USGS recorded this magnitude 2.0 earthquake 4 km E of P?hala, Hawaii at 23:36 UTC on August 31, 2021. It arrived roughly 8 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 M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-31 2021-08-31 23:20:55 UTC | 4.5mb | 95 km SSE of Lorengau, Papua New Guinea -2.826°, 147.620° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
At 23:20 UTC on August 31, 2021, a magnitude 4.5 tremor occurred 95 km SSE of Lorengau, Papua New Guinea. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-31 2021-08-31 22:59:50 UTC | 2.0ml | Rat Islands, Aleutian Islands, Alaska 50.198°, 179.234° | 26.6 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.0 event was detected near Rat Islands, Aleutian Islands, Alaska on August 31, 2021, with origin time 22:59 UTC. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-31 2021-08-31 22:59:16 UTC | 4.4mb | 41 km E of Isangel, Vanuatu -19.518°, 169.672° | 228.6 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.4 seismic event took place 41 km E of Isangel, Vanuatu on August 31, 2021 at 22:59 UTC. The event was offshore. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-31 2021-08-31 22:58:32 UTC | 4.4mb | northern Mid-Atlantic Ridge 30.247°, -42.943° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
August 31, 2021 brought a magnitude 4.4 earthquake near northern Mid-Atlantic Ridge, logged at 22:58 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-31 2021-08-31 22:57:45 UTC | 4.4mb | northern Mid-Atlantic Ridge 29.944°, -42.673° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 31, 2021 at 22:57 UTC, a magnitude 4.4 earthquake struck near northern Mid-Atlantic Ridge. Coming 1 hours after a magnitude 4.8 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-31 2021-08-31 22:55:12 UTC | 2.4ml | 89 km SSE of Perryville, Alaska 55.158°, -158.650° | 13.2 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.4 earthquake was recorded 89 km SSE of Perryville, Alaska on August 31, 2021 at 22:55 UTC. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-31 2021-08-31 22:54:50 UTC | 4.8mb | northern Mid-Atlantic Ridge 29.878°, -42.738° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.8 earthquake was recorded near northern Mid-Atlantic Ridge on August 31, 2021 at 22:54 UTC. Coming 1 hours after a magnitude 5.0 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M4.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-31 2021-08-31 22:53:17 UTC | 4.4mb | northern Mid-Atlantic Ridge 29.937°, -42.560° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.4 earthquake was recorded near northern Mid-Atlantic Ridge on August 31, 2021 at 22:53 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-31 2021-08-31 22:43:53 UTC | 4.5mb | northern Mid-Atlantic Ridge 29.863°, -42.750° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.5 earthquake near northern Mid-Atlantic Ridge at 22:43 UTC on August 31, 2021. Coming 1 hours after a magnitude 5.0 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-31 2021-08-31 22:40:28 UTC | 5.3mww | Scotia Sea -61.185°, -39.095° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 31, 2021, worldwide seismic activity registered a magnitude 5.3 earthquake near Scotia Sea at 22:40 UTC. See the M5.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-31 2021-08-31 22:37:46 UTC | 4.4mb | 57 km SE of Xunchang, China 28.123°, 105.170° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.4 earthquake 57 km SE of Xunchang, China with origin time 22:37 UTC on August 31, 2021. The event was offshore. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-31 2021-08-31 22:36:15 UTC | 4.3mb | 27 km S of Severomuysk, Russia 55.901°, 113.401° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 31, 2021, worldwide seismic activity registered a magnitude 4.3 earthquake 27 km S of Severomuysk, Russia at 22:36 UTC. It arrived roughly 17 hours after a larger magnitude 5.1 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-31 2021-08-31 22:28:53 UTC | 4.7mb | Kermadec Islands, New Zealand -29.904°, -177.160° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.7 event was detected near Kermadec Islands, New Zealand on August 31, 2021, with origin time 22:28 UTC. This event falls inside the aftershock decay of a nearby magnitude 4.9 earthquake that occurred about 19 hours earlier. See the M4.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-31 2021-08-31 22:28:51 UTC | 4.6mb | northern Mid-Atlantic Ridge 29.746°, -42.479° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
At 22:28 UTC on August 31, 2021, a magnitude 4.6 tremor occurred near northern Mid-Atlantic Ridge. It arrived roughly 1 hours after a larger magnitude 5.0 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-31 2021-08-31 22:27:56 UTC | 4.3mb | 33 km ENE of Yujing, Taiwan 23.282°, 120.739° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
At 22:27 UTC on August 31, 2021, a magnitude 4.3 tremor occurred 33 km ENE of Yujing, Taiwan. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-31 2021-08-31 22:26:40 UTC | 2.4ml | 20km E of Little Lake, CA 35.925°, -117.682° | 2.4 km | - | - | - | ✓ Reviewed | USGS → |
On August 31, 2021 at 22:26 UTC, a magnitude 2.4 earthquake struck 20km E of Little Lake, CA. 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. | ||||||||
2021-08-31 2021-08-31 22:26:05 UTC | 4.5mb | 6 km N of Davao, Philippines 7.127°, 125.622° | 23.2 km | 4 | - | - | ✓ Reviewed | USGS → |
This magnitude 4.5 event was detected 6 km N of Davao, Philippines on August 31, 2021, with origin time 22:26 UTC. The event was offshore. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-31 2021-08-31 22:24:23 UTC | 5.0mb | northern Mid-Atlantic Ridge 29.751°, -42.653° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 5.0 seismic event took place near northern Mid-Atlantic Ridge on August 31, 2021 at 22:24 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 M5.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-31 2021-08-31 22:15:52 UTC | 3.6ml | 207 km SE of Perryville, Alaska 54.611°, -156.800° | 24.9 km | - | I | - | ✓ Reviewed | USGS → |
At 22:15 UTC on August 31, 2021, a magnitude 3.6 tremor occurred 207 km SE of Perryville, Alaska. The event was offshore. See the M3.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-31 2021-08-31 22:07:25 UTC | 2.2md | 5 km ENE of P?hala, Hawaii 19.222°, -155.431° | 34.5 km | - | - | - | Auto | USGS → |
Reports of a magnitude 2.2 earthquake 5 km ENE of P?hala, Hawaii came in on August 31, 2021 at 22:07 UTC. It arrived roughly 7 hours after a larger magnitude 2.5 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-31 2021-08-31 22:02:47 UTC | 4.7mb | northern Mid-Atlantic Ridge 29.875°, -42.773° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.7 earthquake near northern Mid-Atlantic Ridge came in on August 31, 2021 at 22:02 UTC. See the M4.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-31 2021-08-31 21:48:05 UTC | 2.1ml | 70 km ESE of Sand Point, Alaska 55.047°, -159.509° | 4.8 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.1 earthquake 70 km ESE of Sand Point, Alaska came in on August 31, 2021 at 21:48 UTC. 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. | ||||||||
2021-08-31 2021-08-31 21:42:46 UTC | 4.2mb | Bonin Islands, Japan region 28.449°, 143.568° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.2 earthquake in the Bonin Islands, Japan region came in on August 31, 2021 at 21:42 UTC. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-31 2021-08-31 21:22:19 UTC | 4.2mb | south of the Fiji Islands -23.802°, -179.251° | 421.8 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.2 seismic event took place south of the Fiji Islands on August 31, 2021 at 21:22 UTC. This deep-focus earthquake originated far below the brittle crust, deep inside the mantle. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-31 2021-08-31 21:02:52 UTC | 2.4ml | 16 km ESE of Pleasanton, Texas 28.906°, -98.321° | 6.5 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.4 earthquake 16 km ESE of Pleasanton, Texas with origin time 21:02 UTC on August 31, 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. | ||||||||
2021-08-31 2021-08-31 20:48:21 UTC | 2.0ml | 16 km ESE of Pleasanton, Texas 28.908°, -98.322° | 6.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.0 earthquake 16 km ESE of Pleasanton, Texas came in on August 31, 2021 at 20:48 UTC. Coming 10 hours after a magnitude 2.5 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. | ||||||||
2021-08-31 2021-08-31 20:37:42 UTC | 2.3ml | 2 km S of P?hala, Hawaii 19.183°, -155.482° | 33.7 km | - | - | - | Auto | USGS → |
Seismographs logged a magnitude 2.3 earthquake 2 km S of P?hala, Hawaii with origin time 20:37 UTC on August 31, 2021. This event falls inside the aftershock decay of a nearby magnitude 2.5 earthquake that occurred about 5 hours earlier. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-31 2021-08-31 20:21:10 UTC | 3.9mb | 10 km S of Tomakomai, Japan 42.547°, 141.609° | 106.8 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 3.9 earthquake 10 km S of Tomakomai, Japan with origin time 20:21 UTC on August 31, 2021. The event was offshore. See the M3.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-31 2021-08-31 20:20:46 UTC | 3.0ml | 4km ENE of Talmage, CA 39.145°, -123.117° | 8.9 km | 122 | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 3.0 earthquake 4km ENE of Talmage, CA at 20:20 UTC on August 31, 2021. See the M3.0 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 August 31, 2021. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.