Earthquakes on October 15, 2023
240
EARTHQUAKES on October 15, 2023
24-hour UTC period · USGS data
9 km deep · 39 people felt it
Normal activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
4
M4.0–4.9
32
M3.0–3.9
13
M2.0–2.9
49
M1.0–1.9
142
Activity Summary
240
Total earthquakes
~250
Daily average
Normal
Activity level
4
M5.0+ events
Geographic Breakdown
Top Countries (International)
South Sandwich Islands
3
Significant Earthquakes (M4.5+)
6.3
34 km NNW of Herāt, Afghanistan
03:36 UTC · 9.0 km deep
Felt by 39
5.4
26 km NNW of Herāt, Afghanistan
03:56 UTC · 10.0 km deep
5.3
18 km NNE of Rāmshīr, Iran
11:15 UTC · 10.0 km deep
Felt by 13
5.2
199 km SE of Katsuura, Japan
09:13 UTC · 16.3 km deep
Felt by 1
4.9
102 km SSW of Chirilagua, El Salvador
22:44 UTC · 51.4 km deep
4.9
South Sandwich Islands region
03:20 UTC · 10.0 km deep
4.8
Kermadec Islands region
16:25 UTC · 10.0 km deep
4.8
South Sandwich Islands region
08:58 UTC · 35.0 km deep
Earthquake Map — October 15, 2023
All Earthquakes — October 15, 2023
Showing 30 of 98 (filtered from 240)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2023-10-15 2023-10-15 23:59:08 UTC | 4.3mb | Pacific-Antarctic Ridge -56.056°, -143.419° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.3 earthquake near Pacific-Antarctic Ridge at 23:59 UTC on October 15, 2023. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-15 2023-10-15 23:54:11 UTC | 2.4ml | 6 km ESE of Spanish Springs, Nevada 39.624°, -119.637° | 10.4 km | 7 | - | - | ✓ Reviewed | USGS → |
A magnitude 2.4 seismic event took place 6 km ESE of Spanish Springs, Nevada on October 15, 2023 at 23:54 UTC. Coming 1 hours after a magnitude 2.9 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. | ||||||||
2023-10-15 2023-10-15 23:53:04 UTC | 2.9ml | 6 km ESE of Spanish Springs, Nevada 39.619°, -119.641° | 8.6 km | 127 | - | - | ✓ Reviewed | USGS → |
On October 15, 2023 at 23:53 UTC, a magnitude 2.9 earthquake struck 6 km ESE of Spanish Springs, Nevada. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-15 2023-10-15 23:42:35 UTC | 3.8md | 53 km SE of Punta Cana, Dominican Republic 18.303°, -67.991° | 89.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 3.8 seismic event took place 53 km SE of Punta Cana, Dominican Republic on October 15, 2023 at 23:42 UTC. The event was offshore. See the M3.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-15 2023-10-15 23:15:24 UTC | 2.0ml | 48 km S of Perryville, Alaska 55.480°, -158.996° | 18.5 km | - | - | - | ✓ Reviewed | USGS → |
On October 15, 2023, worldwide seismic activity registered a magnitude 2.0 earthquake 48 km S of Perryville, Alaska at 23:15 UTC. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-15 2023-10-15 23:12:50 UTC | 4.3mb | 107 km SSW of Calama, Chile -23.357°, -69.313° | 85.8 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.3 event was detected 107 km SSW of Calama, Chile on October 15, 2023, with origin time 23:12 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-15 2023-10-15 22:47:23 UTC | 2.6ml | 264 km ENE of Dawson City, Canada 64.731°, -134.179° | 25.8 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.6 earthquake was recorded 264 km ENE of Dawson City, Canada on October 15, 2023 at 22:47 UTC. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-15 2023-10-15 22:44:41 UTC | 4.9mb | 102 km SSW of Chirilagua, El Salvador 12.351°, -88.471° | 51.4 km | - | - | - | ✓ Reviewed | USGS → |
At 22:44 UTC on October 15, 2023, a magnitude 4.9 tremor occurred 102 km SSW of Chirilagua, El Salvador. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-15 2023-10-15 22:39:51 UTC | 2.2md | 3 km WSW of Indios, Puerto Rico 17.982°, -66.845° | 11.9 km | - | - | - | ✓ Reviewed | USGS → |
On October 15, 2023 at 22:39 UTC, a magnitude 2.2 earthquake struck 3 km WSW of Indios, Puerto Rico. 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 M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-15 2023-10-15 22:23:20 UTC | 2.4md | 9 km SSE of Maria Antonia, Puerto Rico 17.901°, -66.850° | 11.1 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.4 earthquake 9 km SSE of Maria Antonia, Puerto Rico came in on October 15, 2023 at 22:23 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.7 earthquake that occurred about 19 hours earlier. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-15 2023-10-15 22:19:57 UTC | 2.2md | 2 km NW of Stuarts Draft, Virginia 38.046°, -79.059° | 2.4 km | 54 | - | - | ✓ Reviewed | USGS → |
This magnitude 2.2 event was detected 2 km NW of Stuarts Draft, Virginia on October 15, 2023, with origin time 22:19 UTC. 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. | ||||||||
2023-10-15 2023-10-15 22:16:32 UTC | 3.7md | 63 km N of Hatillo, Puerto Rico 19.058°, -66.760° | 45.0 km | 1 | - | - | ✓ Reviewed | USGS → |
October 15, 2023 brought a magnitude 3.7 earthquake 63 km N of Hatillo, Puerto Rico, logged at 22:16 UTC. The event was offshore. See the M3.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-15 2023-10-15 22:16:07 UTC | 4.1mb | 33 km N of Kilimatinde, Tanzania -5.548°, 34.948° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On October 15, 2023 at 22:16 UTC, a magnitude 4.1 earthquake struck 33 km N of Kilimatinde, Tanzania. The event was offshore. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-15 2023-10-15 22:07:48 UTC | 4.4mb | 270 km WSW of Tual, Indonesia -6.139°, 130.361° | 159.5 km | - | - | - | ✓ Reviewed | USGS → |
On October 15, 2023 at 22:07 UTC, a magnitude 4.4 earthquake struck 270 km WSW of Tual, Indonesia. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-15 2023-10-15 22:01:28 UTC | 2.4ml | 81 km W of Salamatof, Alaska 60.684°, -152.795° | 133.3 km | - | - | - | ✓ Reviewed | USGS → |
October 15, 2023 brought a magnitude 2.4 earthquake 81 km W of Salamatof, Alaska, logged at 22:01 UTC. The event was offshore. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-15 2023-10-15 21:54:38 UTC | 3.0md | Puerto Rico region 18.591°, -66.494° | 13.1 km | - | - | - | ✓ Reviewed | USGS → |
October 15, 2023 brought a magnitude 3.0 earthquake in the Puerto Rico region, logged at 21:54 UTC. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-15 2023-10-15 21:39:17 UTC | 4.1mb | 20 km NNE of Herāt, Afghanistan 34.530°, 62.249° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.1 earthquake was recorded 20 km NNE of Herāt, Afghanistan on October 15, 2023 at 21:39 UTC. This event falls inside the aftershock decay of a nearby magnitude 6.3 earthquake that occurred about 18 hours earlier. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-15 2023-10-15 21:29:39 UTC | 2.7ml | 41 km SE of Unalakleet, Alaska 63.568°, -160.319° | 6.2 km | - | - | - | ✓ Reviewed | USGS → |
On October 15, 2023, worldwide seismic activity registered a magnitude 2.7 earthquake 41 km SE of Unalakleet, Alaska at 21:29 UTC. The event was offshore. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-15 2023-10-15 21:09:31 UTC | 2.6ml | 16 km NE of Ojai, CA 34.563°, -119.135° | 4.1 km | 6 | - | - | ✓ Reviewed | USGS → |
On October 15, 2023 at 21:09 UTC, a magnitude 2.6 earthquake struck 16 km NE of Ojai, CA. It arrived roughly 1 hours after a larger magnitude 3.7 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 M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-15 2023-10-15 21:05:23 UTC | 3.5ml | 278 km SE of Chiniak, Alaska 55.800°, -149.145° | 15.6 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 3.5 earthquake was recorded 278 km SE of Chiniak, Alaska on October 15, 2023 at 21:05 UTC. The event was offshore. See the M3.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-15 2023-10-15 20:56:50 UTC | 3.9mb | 272 km N of Saipan, Northern Mariana Islands 17.666°, 145.537° | 258.3 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 3.9 event was detected 272 km N of Saipan, Northern Mariana Islands on October 15, 2023, with origin time 20:56 UTC. The event was offshore. See the M3.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-15 2023-10-15 20:53:17 UTC | 2.9ml | 68 km N of Petersville, Alaska 63.107°, -150.762° | 111.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.9 earthquake was recorded 68 km N of Petersville, Alaska on October 15, 2023 at 20:53 UTC. The event was offshore. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-15 2023-10-15 19:59:36 UTC | 4.3mb | 48 km WNW of Bengkulu, Indonesia -3.626°, 101.863° | 72.5 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.3 earthquake 48 km WNW of Bengkulu, Indonesia came in on October 15, 2023 at 19:59 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-15 2023-10-15 19:52:14 UTC | 3.3ml | 17 km NE of Ojai, CA 34.569°, -119.135° | 1.6 km | 18 | IV | - | ✓ Reviewed | USGS → |
This magnitude 3.3 event was detected 17 km NE of Ojai, CA on October 15, 2023, with origin time 19:52 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.7 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 M3.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-15 2023-10-15 19:52:11 UTC | 2.7ml | 7 km ESE of Spanish Springs, Nevada 39.630°, -119.618° | 8.7 km | 27 | - | - | ✓ Reviewed | USGS → |
At 19:52 UTC on October 15, 2023, a magnitude 2.7 tremor occurred 7 km ESE of Spanish Springs, Nevada. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-15 2023-10-15 19:50:16 UTC | 3.7ml | 16 km NE of Ojai, CA 34.564°, -119.136° | 7.0 km | 117 | III | - | ✓ Reviewed | USGS → |
On October 15, 2023 at 19:50 UTC, a magnitude 3.7 earthquake struck 16 km NE of Ojai, CA. 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 M3.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-15 2023-10-15 18:55:12 UTC | 2.1md | 16 km E of Seven Trees, CA 37.285°, -121.654° | 6.9 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.1 earthquake 16 km E of Seven Trees, CA with origin time 18:55 UTC on October 15, 2023. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-15 2023-10-15 18:36:07 UTC | 2.7ml | 97 km SSE of Akutan, Alaska 53.382°, -165.016° | 32.8 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.7 earthquake 97 km SSE of Akutan, Alaska at 18:36 UTC on October 15, 2023. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-15 2023-10-15 18:35:27 UTC | 3.1md | 52 km N of Brenas, Puerto Rico 18.940°, -66.280° | 11.3 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 3.1 earthquake 52 km N of Brenas, Puerto Rico came in on October 15, 2023 at 18:35 UTC. Coming 14 hours after a magnitude 3.4 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M3.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-15 2023-10-15 17:57:45 UTC | 4.4mb | 48 km ESE of Port-Olry, Vanuatu -15.203°, 167.497° | 141.2 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.4 earthquake was recorded 48 km ESE of Port-Olry, Vanuatu on October 15, 2023 at 17:57 UTC. See the M4.4 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 October 15, 2023. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.