Earthquakes on September 18, 2023
266
EARTHQUAKES on September 18, 2023
24-hour UTC period · USGS data
LARGEST: M6.3 — 191 km N of Hirara, Japan
176 km deep · 42 people felt it
Normal activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
4
M4.0–4.9
40
M3.0–3.9
15
M2.0–2.9
43
M1.0–1.9
164
Activity Summary
266
Total earthquakes
~250
Daily average
Normal
Activity level
4
M5.0+ events
Significant Earthquakes (M4.5+)
6.3
191 km N of Hirara, Japan
13:21 UTC · 176.0 km deep
Felt by 42
5.5
20 km ENE of Onagawa Chō, Japan
19:33 UTC · 51.0 km deep
Felt by 15
5.1
7 km SE of Marradi, Italy
03:10 UTC · 10.0 km deep
Felt by 67
5.0
Pacific-Antarctic Ridge
16:49 UTC · 10.0 km deep
4.9
115 km ESE of Honiara, Solomon Islands
22:40 UTC · 10.0 km deep
4.9
24 km SW of Victoria, Philippines
11:02 UTC · 10.0 km deep
Felt by 1
4.9
25 km W of Tayaman, Philippines
02:54 UTC · 35.0 km deep
Felt by 1
4.8
Vanuatu
19:44 UTC · 158.7 km deep
Earthquake Map — September 18, 2023
All Earthquakes — September 18, 2023
Showing 30 of 102 (filtered from 266)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2023-09-18 2023-09-18 23:29:36 UTC | 2.4ml | 28 km WNW of Stebbins, Alaska 63.617°, -162.817° | 30.1 km | - | - | - | ✓ Reviewed | USGS → |
At 23:29 UTC on September 18, 2023, a magnitude 2.4 tremor occurred 28 km WNW of Stebbins, Alaska. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-18 2023-09-18 23:25:34 UTC | 3.0md | 22 km NNE of San Ardo, CA 36.193°, -120.776° | 8.2 km | 8 | - | - | ✓ Reviewed | USGS → |
September 18, 2023 brought a magnitude 3.0 earthquake 22 km NNE of San Ardo, CA, logged at 23:25 UTC. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-18 2023-09-18 23:11:34 UTC | 2.4ml | 2 km NE of Wayne, Oklahoma 34.939°, -97.295° | 4.5 km | 6 | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.4 earthquake 2 km NE of Wayne, Oklahoma came in on September 18, 2023 at 23:11 UTC. 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. | ||||||||
2023-09-18 2023-09-18 22:40:57 UTC | 4.9mb | 115 km ESE of Honiara, Solomon Islands -9.998°, 160.834° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
At 22:40 UTC on September 18, 2023, a magnitude 4.9 tremor occurred 115 km ESE of Honiara, Solomon Islands. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-18 2023-09-18 22:33:46 UTC | 4.2mb | Peru-Ecuador border region -4.901°, -80.914° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
At 22:33 UTC on September 18, 2023, a magnitude 4.2 tremor occurred in the Peru-Ecuador border region. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-18 2023-09-18 22:11:43 UTC | 4.1mb | 140 km ENE of Maumere, Indonesia -7.996°, 123.318° | 232.9 km | - | - | - | ✓ Reviewed | USGS → |
On September 18, 2023 at 22:11 UTC, a magnitude 4.1 earthquake struck 140 km ENE of Maumere, Indonesia. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-18 2023-09-18 21:37:52 UTC | 2.1md | 16 km E of Pāhala, Hawaii 19.178°, -155.328° | 43.0 km | - | - | - | ✓ Reviewed | USGS → |
On September 18, 2023, worldwide seismic activity registered a magnitude 2.1 earthquake 16 km E of Pāhala, Hawaii at 21:37 UTC. It arrived roughly 3 hours after a larger magnitude 2.3 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. | ||||||||
2023-09-18 2023-09-18 21:36:57 UTC | 3.1ml | 76 km ESE of Perryville, Alaska 55.558°, -158.093° | 43.9 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 3.1 earthquake 76 km ESE of Perryville, Alaska with origin time 21:36 UTC on September 18, 2023. See the M3.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-18 2023-09-18 21:33:26 UTC | 4.5mb | Izu Islands, Japan region 31.416°, 141.702° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.5 seismic event took place in the Izu Islands, Japan region on September 18, 2023 at 21:33 UTC. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-18 2023-09-18 21:32:55 UTC | 3.1ml | Andreanof Islands, Aleutian Islands, Alaska 51.976°, -173.607° | 9.6 km | - | - | - | ✓ Reviewed | USGS → |
On September 18, 2023, worldwide seismic activity registered a magnitude 3.1 earthquake near Andreanof Islands, Aleutian Islands, Alaska at 21:32 UTC. See the M3.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-18 2023-09-18 21:21:21 UTC | 4.3mb | Izu Islands, Japan region 31.458°, 141.564° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.3 earthquake in the Izu Islands, Japan region came in on September 18, 2023 at 21:21 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-18 2023-09-18 21:02:27 UTC | 2.0md | 6 km NNW of The Geysers, CA 38.819°, -122.789° | 1.8 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.0 earthquake 6 km NNW of The Geysers, CA came in on September 18, 2023 at 21:02 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.2 earthquake that occurred about 15 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. | ||||||||
2023-09-18 2023-09-18 20:51:46 UTC | 2.2ml | 49 km NW of Rampart, Alaska 65.852°, -150.834° | 15.6 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.2 earthquake was recorded 49 km NW of Rampart, Alaska on September 18, 2023 at 20:51 UTC. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-18 2023-09-18 20:32:10 UTC | 4.1mb | 161 km S of Ōyama, Japan 33.148°, 138.303° | 296.8 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.1 earthquake was recorded 161 km S of Ōyama, Japan on September 18, 2023 at 20:32 UTC. The event was offshore. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-18 2023-09-18 20:32:00 UTC | 4.1mb | 94 km SW of Sechura, Peru -6.101°, -81.483° | 17.9 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.1 earthquake 94 km SW of Sechura, Peru with origin time 20:32 UTC on September 18, 2023. The event was offshore. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-18 2023-09-18 20:02:02 UTC | 3.1ml | 48 km SE of Atka, Alaska 51.955°, -173.616° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
At 20:02 UTC on September 18, 2023, a magnitude 3.1 tremor occurred 48 km SE of Atka, Alaska. The event was offshore. See the M3.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-18 2023-09-18 19:44:43 UTC | 4.8mb | Vanuatu -14.768°, 167.349° | 158.7 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.8 earthquake near Vanuatu came in on September 18, 2023 at 19:44 UTC. See the M4.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-18 2023-09-18 19:33:03 UTC | 5.5mww | 20 km ENE of Onagawa Chō, Japan 38.523°, 141.658° | 51.0 km | 15 | IV | green | ✓ Reviewed | USGS → |
A magnitude 5.5 earthquake was recorded 20 km ENE of Onagawa Chō, Japan on September 18, 2023 at 19:33 UTC. The USGS PAGER system assigned a green alert level for this event, signalling no significant casualties or damage expected. See the M5.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-18 2023-09-18 19:25:50 UTC | 2.0md | 3 km SW of Indios, Puerto Rico 17.972°, -66.838° | 16.5 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.0 event was detected 3 km SW of Indios, Puerto Rico on September 18, 2023, with origin time 19:25 UTC. It arrived roughly 17 hours after a larger magnitude 2.9 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. | ||||||||
2023-09-18 2023-09-18 19:04:06 UTC | 2.1ml | 91 km S of False Pass, Alaska 54.050°, -163.150° | 16.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.1 earthquake 91 km S of False Pass, Alaska came in on September 18, 2023 at 19:04 UTC. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-18 2023-09-18 19:03:28 UTC | 2.2md | 3 km WSW of Tahoe Vista, CA 39.225°, -120.084° | 3.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.2 earthquake 3 km WSW of Tahoe Vista, CA at 19:03 UTC on September 18, 2023. This event falls inside the aftershock decay of a nearby magnitude 3.2 earthquake that occurred about 15 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. | ||||||||
2023-09-18 2023-09-18 19:02:17 UTC | 2.4ml | 254 km SSW of Inuvik, Canada 66.197°, -135.595° | 21.7 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.4 earthquake 254 km SSW of Inuvik, Canada at 19:02 UTC on September 18, 2023. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-18 2023-09-18 18:47:32 UTC | 2.3md | Island of Hawaii, Hawaii 19.164°, -155.362° | 29.4 km | - | - | - | Auto | USGS → |
On September 18, 2023 at 18:47 UTC, a magnitude 2.3 earthquake struck near Island of Hawaii, Hawaii. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-18 2023-09-18 18:41:23 UTC | 3.1ml | 209 km WSW of Adak, Alaska 51.332°, -179.531° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 3.1 earthquake 209 km WSW of Adak, Alaska at 18:41 UTC on September 18, 2023. See the M3.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-18 2023-09-18 17:57:28 UTC | 4.4mb | 154 km SSW of Bengkulu, Indonesia -5.163°, 101.948° | 25.0 km | - | - | - | ✓ Reviewed | USGS → |
At 17:57 UTC on September 18, 2023, a magnitude 4.4 tremor occurred 154 km SSW of Bengkulu, Indonesia. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-18 2023-09-18 17:24:48 UTC | 4.5mb | Izu Islands, Japan region 32.209°, 142.126° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
September 18, 2023 brought a magnitude 4.5 earthquake in the Izu Islands, Japan region, logged at 17:24 UTC. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-18 2023-09-18 17:06:03 UTC | 4.8mb | Pacific-Antarctic Ridge -55.399°, -128.654° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.8 seismic event took place near Pacific-Antarctic Ridge on September 18, 2023 at 17:06 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. | ||||||||
2023-09-18 2023-09-18 17:01:22 UTC | 3.6md | Puerto Rico region 19.202°, -66.708° | 59.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 3.6 earthquake in the Puerto Rico region came in on September 18, 2023 at 17:01 UTC. See the M3.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-18 2023-09-18 16:49:25 UTC | 5.0mb | Pacific-Antarctic Ridge -55.369°, -128.595° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On September 18, 2023, worldwide seismic activity registered a magnitude 5.0 earthquake near Pacific-Antarctic Ridge at 16:49 UTC. See the M5.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-18 2023-09-18 16:42:38 UTC | 4.6mb | 199 km WSW of Kavieng, Papua New Guinea -3.507°, 149.261° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.6 earthquake was recorded 199 km WSW of Kavieng, Papua New Guinea on September 18, 2023 at 16:42 UTC. See the M4.6 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 18, 2023. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.