Earthquakes on August 31, 2023
301
EARTHQUAKES on August 31, 2023
24-hour UTC period · USGS data
47 km deep · 4 people felt it
Elevated activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
2
M4.0–4.9
25
M3.0–3.9
11
M2.0–2.9
78
M1.0–1.9
185
Activity Summary
301
Total earthquakes
~250
Daily average
Elevated
Activity level
2
M5.0+ events
Geographic Breakdown
By US State
Top Countries (International)
Significant Earthquakes (M4.5+)
5.4
19 km NE of Naisano Dua, Indonesia
10:29 UTC · 47.2 km deep
Felt by 4
5.1
51 km SSE of Honiara, Solomon Islands
19:33 UTC · 22.7 km deep
Felt by 3
4.9
southern Mid-Atlantic Ridge
02:44 UTC · 10.0 km deep
4.8
117 km WSW of Pangai, Tonga
19:18 UTC · 149.9 km deep
Felt by 1
4.8
78 km W of Murghob, Tajikistan
18:45 UTC · 50.2 km deep
4.7
South Sandwich Islands region
11:02 UTC · 38.3 km deep
4.7
Andreanof Islands, Aleutian Islands, Alaska
07:13 UTC · 48.5 km deep
4.6
23 km SSW of Tagāb, Afghanistan
16:53 UTC · 14.9 km deep
Felt by 3
Earthquake Map — August 31, 2023
All Earthquakes — August 31, 2023
Showing 30 of 116 (filtered from 301)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2023-08-31 2023-08-31 23:36:00 UTC | 2.3md | 7 km SW of Volcano, Hawaii 19.390°, -155.278° | 1.9 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.3 event was detected 7 km SW of Volcano, Hawaii on August 31, 2023, with origin time 23:36 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.1 earthquake that occurred about 4 hours earlier. 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. | ||||||||
2023-08-31 2023-08-31 23:32:31 UTC | 2.5ml | 33 km SE of Malaga, New Mexico 32.007°, -103.826° | 7.5 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.5 earthquake 33 km SE of Malaga, New Mexico came in on August 31, 2023 at 23:32 UTC. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-31 2023-08-31 23:21:54 UTC | 2.3ml | 157 km WSW of Adak, Alaska 51.129°, -178.563° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.3 earthquake was recorded 157 km WSW of Adak, Alaska on August 31, 2023 at 23:21 UTC. It arrived roughly 16 hours after a larger magnitude 4.7 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. | ||||||||
2023-08-31 2023-08-31 22:21:46 UTC | 2.0ml | 8 km ENE of Sprague, Washington 47.339°, -117.876° | -0.7 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.0 seismic event took place 8 km ENE of Sprague, Washington on August 31, 2023 at 22:21 UTC. 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. | ||||||||
2023-08-31 2023-08-31 21:45:51 UTC | 2.1ml | 52 km SSE of Whites City, New Mexico 31.711°, -104.261° | 7.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.1 event was detected 52 km SSE of Whites City, New Mexico on August 31, 2023, with origin time 21:45 UTC. It arrived roughly 3 hours after a larger magnitude 2.4 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-31 2023-08-31 21:43:25 UTC | 4.5mb | South Sandwich Islands region -55.917°, -26.664° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 31, 2023 at 21:43 UTC, a magnitude 4.5 earthquake struck in the South Sandwich Islands region. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-31 2023-08-31 21:40:28 UTC | 2.3ml | 7 km ENE of Delta, B.C., MX 32.373°, -115.119° | 11.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 31, 2023 at 21:40 UTC, a magnitude 2.3 earthquake struck 7 km ENE of Delta, B.C., MX. Coming 1 hours after a magnitude 2.4 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. | ||||||||
2023-08-31 2023-08-31 21:38:48 UTC | 2.4ml | 6 km NE of Delta, B.C., MX 32.389°, -115.142° | 6.5 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.4 earthquake 6 km NE of Delta, B.C., MX with origin time 21:38 UTC on August 31, 2023. The event was offshore. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-31 2023-08-31 21:34:56 UTC | 2.2md | 10 km S of Pāhala, Hawaii 19.111°, -155.477° | 27.0 km | - | - | - | Auto | USGS → |
This magnitude 2.2 event was detected 10 km S of Pāhala, Hawaii on August 31, 2023, with origin time 21:34 UTC. Coming 2 hours after a magnitude 3.1 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. | ||||||||
2023-08-31 2023-08-31 21:34:12 UTC | 2.3ml | Island of Hawaii, Hawaii 19.384°, -155.279° | 1.3 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.3 earthquake near Island of Hawaii, Hawaii at 21:34 UTC on August 31, 2023. This event falls inside the aftershock decay of a nearby magnitude 3.1 earthquake that occurred about 2 hours earlier. 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. | ||||||||
2023-08-31 2023-08-31 21:18:32 UTC | 2.0md | 8 km NW of Pinnacles, CA 36.591°, -121.197° | 6.8 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.0 earthquake 8 km NW of Pinnacles, CA came in on August 31, 2023 at 21:18 UTC. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-31 2023-08-31 21:12:11 UTC | 2.4md | 30 km WNW of Petrolia, CA 40.392°, -124.626° | 21.3 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.4 earthquake was recorded 30 km WNW of Petrolia, CA on August 31, 2023 at 21:12 UTC. Coming 20 hours after a magnitude 2.4 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-31 2023-08-31 20:47:26 UTC | 2.6ml | 33 km S of Skwentna, Alaska 61.698°, -151.296° | 79.5 km | - | - | - | ✓ Reviewed | USGS → |
On August 31, 2023 at 20:47 UTC, a magnitude 2.6 earthquake struck 33 km S of Skwentna, Alaska. The event was offshore. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-31 2023-08-31 20:40:43 UTC | 2.5ml | 84 km ENE of Akutan, Alaska 54.334°, -164.518° | 10.5 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.5 seismic event took place 84 km ENE of Akutan, Alaska on August 31, 2023 at 20:40 UTC. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-31 2023-08-31 20:26:47 UTC | 3.0ml | 136 km SW of Point Hope, Alaska 67.371°, -168.675° | 13.5 km | - | - | - | ✓ Reviewed | USGS → |
At 20:26 UTC on August 31, 2023, a magnitude 3.0 tremor occurred 136 km SW of Point Hope, Alaska. The event was offshore. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-31 2023-08-31 20:23:58 UTC | 2.0ml | 7 km SW of Volcano, Hawaii 19.392°, -155.277° | 1.5 km | - | - | - | ✓ Reviewed | USGS → |
August 31, 2023 brought a magnitude 2.0 earthquake 7 km SW of Volcano, Hawaii, logged at 20:23 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.1 earthquake that occurred about 1 hours earlier. 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. | ||||||||
2023-08-31 2023-08-31 20:08:56 UTC | 2.5md | 4 km SW of Guánica, Puerto Rico 17.940°, -66.933° | 16.1 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.5 event was detected 4 km SW of Guánica, Puerto Rico on August 31, 2023, with origin time 20:08 UTC. It arrived roughly 19 hours after a larger magnitude 2.7 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-31 2023-08-31 20:00:43 UTC | 4.2mb | 136 km SE of Ollagüe, Chile -22.001°, -67.224° | 185.6 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.2 earthquake 136 km SE of Ollagüe, Chile with origin time 20:00 UTC on August 31, 2023. The event was offshore. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-31 2023-08-31 19:56:51 UTC | 2.5ml | 7 km SW of Volcano, Hawaii 19.390°, -155.274° | 1.7 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.5 earthquake 7 km SW of Volcano, Hawaii at 19:56 UTC on August 31, 2023. This event falls inside the aftershock decay of a nearby magnitude 3.1 earthquake that occurred about 1 hours earlier. 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. | ||||||||
2023-08-31 2023-08-31 19:56:19 UTC | 4.4mb | Greenland Sea 73.826°, 8.556° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 31, 2023, worldwide seismic activity registered a magnitude 4.4 earthquake near Greenland Sea at 19:56 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-31 2023-08-31 19:33:42 UTC | 5.1mb | 51 km SSE of Honiara, Solomon Islands -9.824°, 160.211° | 22.7 km | 3 | - | - | ✓ Reviewed | USGS → |
A magnitude 5.1 earthquake was recorded 51 km SSE of Honiara, Solomon Islands on August 31, 2023 at 19:33 UTC. See the M5.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-31 2023-08-31 19:18:37 UTC | 4.8mb | 117 km WSW of Pangai, Tonga -20.073°, -175.446° | 149.9 km | 1 | - | - | ✓ Reviewed | USGS → |
On August 31, 2023, worldwide seismic activity registered a magnitude 4.8 earthquake 117 km WSW of Pangai, Tonga at 19:18 UTC. See the M4.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-31 2023-08-31 19:16:15 UTC | 2.5ml | 15 km W of Trapper Creek, Alaska 62.302°, -150.537° | 60.0 km | - | - | - | ✓ Reviewed | USGS → |
August 31, 2023 brought a magnitude 2.5 earthquake 15 km W of Trapper Creek, Alaska, logged at 19:16 UTC. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-31 2023-08-31 19:16:10 UTC | 2.5md | 3 km SSW of Guánica, Puerto Rico 17.943°, -66.928° | 16.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.5 event was detected 3 km SSW of Guánica, Puerto Rico on August 31, 2023, with origin time 19:16 UTC. Coming 19 hours after a magnitude 2.7 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-31 2023-08-31 19:12:50 UTC | 3.1ml | 13 km ENE of Pāhala, Hawaii 19.236°, -155.358° | 30.1 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 3.1 earthquake 13 km ENE of Pāhala, Hawaii with origin time 19:12 UTC on August 31, 2023. In the 72 hours after this event, the USGS recorded 6 smaller earthquakes within 20 km, consistent with an ongoing aftershock sequence rooted here. See the M3.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-31 2023-08-31 18:53:42 UTC | 2.0ml | 53 km S of Adak, Alaska 51.394°, -176.602° | 25.6 km | - | - | - | ✓ Reviewed | USGS → |
On August 31, 2023 at 18:53 UTC, a magnitude 2.0 earthquake struck 53 km S of Adak, Alaska. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-31 2023-08-31 18:45:19 UTC | 4.8mb | 78 km W of Murghob, Tajikistan 38.085°, 73.073° | 50.2 km | - | - | - | ✓ Reviewed | USGS → |
At 18:45 UTC on August 31, 2023, a magnitude 4.8 tremor occurred 78 km W of Murghob, Tajikistan. The event was offshore. See the M4.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-31 2023-08-31 18:33:56 UTC | 4.4mb | 273 km SSE of Ambon, Indonesia -6.026°, 129.002° | 248.1 km | - | - | - | ✓ Reviewed | USGS → |
At 18:33 UTC on August 31, 2023, a magnitude 4.4 tremor occurred 273 km SSE of Ambon, Indonesia. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-31 2023-08-31 18:28:41 UTC | 2.4ml | 54 km S of Whites City, New Mexico 31.688°, -104.283° | 8.5 km | - | - | - | ✓ Reviewed | USGS → |
August 31, 2023 brought a magnitude 2.4 earthquake 54 km S of Whites City, New Mexico, logged at 18:28 UTC. The event was offshore. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-31 2023-08-31 18:09:25 UTC | 2.1ml | 11 km SSE of Volcano, Hawaii 19.346°, -155.193° | 5.1 km | 1 | - | - | ✓ Reviewed | USGS → |
At 18:09 UTC on August 31, 2023, a magnitude 2.1 tremor occurred 11 km SSE of Volcano, Hawaii. This event falls inside the aftershock decay of a nearby magnitude 2.6 earthquake that occurred about 16 hours earlier. See the M2.1 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, 2023. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.