Earthquakes on August 15, 2023
332
EARTHQUAKES on August 15, 2023
24-hour UTC period · USGS data
LARGEST: M5.5 — Flores region, Indonesia
173 km deep · 1 person felt it
Elevated activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
2
M4.0–4.9
31
M3.0–3.9
15
M2.0–2.9
77
M1.0–1.9
207
Activity Summary
332
Total earthquakes
~250
Daily average
Elevated
Activity level
2
M5.0+ events
Significant Earthquakes (M4.5+)
5.5
Flores region, Indonesia
03:54 UTC · 173.0 km deep
Felt by 1
5.0
southwestern Ryukyu Islands, Japan
17:07 UTC · 39.0 km deep
4.8
central Mid-Atlantic Ridge
23:40 UTC · 10.0 km deep
4.8
54 km N of Santa Rosa, Peru
07:06 UTC · 117.7 km deep
4.7
149 km SW of Adak, Alaska
16:20 UTC · 10.0 km deep
4.6
19 km NNE of Hualien City, Taiwan
17:09 UTC · 31.4 km deep
4.6
208 km SE of Kokopo, Papua New Guinea
16:55 UTC · 10.0 km deep
4.6
163 km S of Severo-Kuril’sk, Russia
15:00 UTC · 38.0 km deep
Earthquake Map — August 15, 2023
All Earthquakes — August 15, 2023
Showing 30 of 125 (filtered from 332)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2023-08-15 2023-08-15 23:56:47 UTC | 2.6ml | Rat Islands, Aleutian Islands, Alaska 50.267°, 178.342° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 15, 2023, worldwide seismic activity registered a magnitude 2.6 earthquake near Rat Islands, Aleutian Islands, Alaska at 23:56 UTC. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-15 2023-08-15 23:48:11 UTC | 4.1mb | 47 km NNE of San Pedro de Atacama, Chile -22.541°, -67.970° | 150.3 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.1 earthquake 47 km NNE of San Pedro de Atacama, Chile at 23:48 UTC on August 15, 2023. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-15 2023-08-15 23:40:20 UTC | 4.8mb | central Mid-Atlantic Ridge 0.762°, -29.656° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.8 earthquake near central Mid-Atlantic Ridge with origin time 23:40 UTC on August 15, 2023. See the M4.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-15 2023-08-15 23:00:02 UTC | 3.1ml | 192 km SE of Atka, Alaska 50.778°, -172.601° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 3.1 earthquake 192 km SE of Atka, Alaska came in on August 15, 2023 at 23:00 UTC. The event was offshore. See the M3.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-15 2023-08-15 22:57:39 UTC | 2.8ml | 54 km S of Whites City, New Mexico 31.684°, -104.386° | 6.1 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.8 earthquake 54 km S of Whites City, New Mexico at 22:57 UTC on August 15, 2023. The event was offshore. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-15 2023-08-15 22:41:34 UTC | 2.7ml | Rat Islands, Aleutian Islands, Alaska 51.800°, 178.493° | 108.7 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.7 earthquake near Rat Islands, Aleutian Islands, Alaska came in on August 15, 2023 at 22:41 UTC. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-15 2023-08-15 22:39:05 UTC | 2.9ml | 7 km WSW of Thayne, Wyoming 42.892°, -111.086° | 1.2 km | 12 | - | - | ✓ Reviewed | USGS → |
August 15, 2023 brought a magnitude 2.9 earthquake 7 km WSW of Thayne, Wyoming, logged at 22:39 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-15 2023-08-15 22:33:38 UTC | 2.1ml | 7 km SW of Volcano, Hawaii 19.393°, -155.278° | 1.7 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.1 earthquake was recorded 7 km SW of Volcano, Hawaii on August 15, 2023 at 22:33 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. 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. | ||||||||
2023-08-15 2023-08-15 22:16:13 UTC | 3.1ml | 183 km SW of Nikolski, Alaska 51.954°, -171.023° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 3.1 seismic event took place 183 km SW of Nikolski, Alaska on August 15, 2023 at 22:16 UTC. The event was offshore. See the M3.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-15 2023-08-15 22:03:44 UTC | 2.5ml | 7 km SW of Volcano, Hawaii 19.392°, -155.277° | 1.8 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.5 earthquake 7 km SW of Volcano, Hawaii at 22:03 UTC on August 15, 2023. 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. 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. | ||||||||
2023-08-15 2023-08-15 21:41:53 UTC | 2.3ml | 9 km E of Pearsall, Texas 28.903°, -99.001° | 7.5 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.3 earthquake was recorded 9 km E of Pearsall, Texas on August 15, 2023 at 21:41 UTC. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-15 2023-08-15 21:37:41 UTC | 4.3mb | 26 km SW of Isangel, Vanuatu -19.731°, 169.126° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 15, 2023 at 21:37 UTC, a magnitude 4.3 earthquake struck 26 km SW of Isangel, Vanuatu. The event was offshore. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-15 2023-08-15 21:37:39 UTC | 3.0ml | 7 km SW of Volcano, Hawaii 19.391°, -155.277° | 1.7 km | 1 | - | - | ✓ Reviewed | USGS → |
A magnitude 3.0 earthquake was recorded 7 km SW of Volcano, Hawaii on August 15, 2023 at 21:37 UTC. In the 72 hours after this event, the USGS recorded 4 smaller earthquakes within 20 km, consistent with an ongoing aftershock sequence rooted here. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-15 2023-08-15 21:36:51 UTC | 2.9ml | 142 km SW of Adak, Alaska 50.989°, -178.124° | 17.2 km | - | - | - | ✓ Reviewed | USGS → |
On August 15, 2023 at 21:36 UTC, a magnitude 2.9 earthquake struck 142 km SW of Adak, Alaska. Coming 5 hours after a magnitude 4.7 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-15 2023-08-15 21:25:14 UTC | 2.6ml | 51 km S of Sand Point, Alaska 54.873°, -160.397° | 30.5 km | - | - | - | ✓ Reviewed | USGS → |
At 21:25 UTC on August 15, 2023, a magnitude 2.6 tremor occurred 51 km S of Sand Point, Alaska. The event was offshore. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-15 2023-08-15 20:26:30 UTC | 2.0ml | 42 km ESE of Pope-Vannoy Landing, Alaska 59.372°, -153.833° | 100.9 km | - | - | - | ✓ Reviewed | USGS → |
At 20:26 UTC on August 15, 2023, a magnitude 2.0 tremor occurred 42 km ESE of Pope-Vannoy Landing, Alaska. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-15 2023-08-15 20:25:32 UTC | 4.0mb | Fiji region -19.552°, -178.194° | 577.5 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.0 seismic event took place in the Fiji region on August 15, 2023 at 20:25 UTC. This is the deepest earthquake in the current dataset — a deep-focus event. See the M4.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-15 2023-08-15 20:23:38 UTC | 2.3ml | 32 km W of Rancho Palos Verdes, CA 33.718°, -118.728° | 2.9 km | - | - | - | ✓ Reviewed | USGS → |
On August 15, 2023 at 20:23 UTC, a magnitude 2.3 earthquake struck 32 km W of Rancho Palos Verdes, CA. 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. | ||||||||
2023-08-15 2023-08-15 20:13:12 UTC | 3.6ml | 17 km E of Wright, Wyoming 43.758°, -105.270° | 0.0 km | - | - | - | ✓ Reviewed | USGS → |
At 20:13 UTC on August 15, 2023, a magnitude 3.6 tremor occurred 17 km E of Wright, Wyoming. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M3.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-15 2023-08-15 20:11:13 UTC | 2.9ml | 85 km S of False Pass, Alaska 54.089°, -163.553° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.9 earthquake was recorded 85 km S of False Pass, Alaska on August 15, 2023 at 20:11 UTC. The event was offshore. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-15 2023-08-15 19:49:24 UTC | 2.2md | 18 km NW of Parkfield, CA 36.013°, -120.573° | 3.8 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.2 seismic event took place 18 km NW of Parkfield, CA on August 15, 2023 at 19:49 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.6 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 M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-15 2023-08-15 19:43:14 UTC | 2.6md | 18 km NW of Parkfield, CA 36.012°, -120.576° | 4.3 km | 3 | - | - | ✓ Reviewed | USGS → |
A magnitude 2.6 earthquake was recorded 18 km NW of Parkfield, CA on August 15, 2023 at 19:43 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. | ||||||||
2023-08-15 2023-08-15 19:37:43 UTC | 3.1ml | 236 km W of Bandon, Oregon 43.329°, -127.301° | 15.4 km | 2 | - | - | ✓ Reviewed | USGS → |
August 15, 2023 brought a magnitude 3.1 earthquake 236 km W of Bandon, Oregon, logged at 19:37 UTC. The event was offshore. See the M3.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-15 2023-08-15 19:22:36 UTC | 2.4md | 22 km SE of Shaver Lake, CA 36.967°, -119.131° | 37.9 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.4 earthquake 22 km SE of Shaver Lake, CA came in on August 15, 2023 at 19:22 UTC. The event was offshore. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-15 2023-08-15 18:50:00 UTC | 2.1md | 4 km E of Lawrenceville, Illinois 38.725°, -87.632° | 6.2 km | 8 | - | - | ✓ Reviewed | USGS → |
A magnitude 2.1 seismic event took place 4 km E of Lawrenceville, Illinois on August 15, 2023 at 18:50 UTC. Coming 18 hours after a magnitude 2.3 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-15 2023-08-15 18:31:54 UTC | 4.4mb | Kermadec Islands, New Zealand -30.459°, -178.532° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.4 earthquake was recorded near Kermadec Islands, New Zealand on August 15, 2023 at 18:31 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-15 2023-08-15 18:31:17 UTC | 2.2ml | 22 km WSW of Pelican, Alaska 57.921°, -136.608° | 4.9 km | - | - | - | ✓ Reviewed | USGS → |
On August 15, 2023 at 18:31 UTC, a magnitude 2.2 earthquake struck 22 km WSW of Pelican, Alaska. 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. | ||||||||
2023-08-15 2023-08-15 18:23:08 UTC | 2.0ml | 58 km NNE of Yakutat, Alaska 60.040°, -139.386° | 10.5 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.0 earthquake 58 km NNE of Yakutat, Alaska at 18:23 UTC on August 15, 2023. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-15 2023-08-15 18:09:36 UTC | 4.0mb | Alaska Peninsula 54.778°, -161.210° | 35.0 km | 1 | I | - | ✓ Reviewed | USGS → |
August 15, 2023 brought a magnitude 4.0 earthquake near Alaska Peninsula, logged at 18:09 UTC. See the M4.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-15 2023-08-15 18:08:19 UTC | 4.2mb | 73 km S of Sola, Vanuatu -14.540°, 167.522° | 143.7 km | - | - | - | ✓ Reviewed | USGS → |
At 18:08 UTC on August 15, 2023, a magnitude 4.2 tremor occurred 73 km S of Sola, Vanuatu. The event was offshore. See the M4.2 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 15, 2023. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.