Earthquakes on October 23, 2023
359
EARTHQUAKES on October 23, 2023
24-hour UTC period · USGS data
LARGEST: M6.0 — Kermadec Islands, New Zealand
19 km deep
Elevated activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
6
M4.0–4.9
36
M3.0–3.9
14
M2.0–2.9
76
M1.0–1.9
227
Activity Summary
359
Total earthquakes
~250
Daily average
Elevated
Activity level
6
M5.0+ events
Geographic Breakdown
By US State
Top Countries (International)
Significant Earthquakes (M4.5+)
6.0
Kermadec Islands, New Zealand
10:10 UTC · 19.0 km deep
5.9
59 km SW of Yonakuni, Japan
23:05 UTC · 31.0 km deep
Felt by 51
5.4
36 km ENE of Bulolo, Papua New Guinea
23:24 UTC · 56.2 km deep
Felt by 2
5.2
193 km S of Mata-Utu, Wallis and Futuna
10:31 UTC · 325.4 km deep
5.1
Kermadec Islands, New Zealand
23:02 UTC · 35.0 km deep
5.0
60 km S of Tobelo, Indonesia
15:30 UTC · 9.9 km deep
4.9
Kermadec Islands, New Zealand
08:03 UTC · 35.0 km deep
4.9
246 km NNW of Nagqu, China
06:10 UTC · 10.0 km deep
Earthquake Map — October 23, 2023
All Earthquakes — October 23, 2023
Showing 30 of 132 (filtered from 359)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2023-10-23 2023-10-23 23:57:02 UTC | 2.1ml | 15 km WSW of Falls City, Texas 28.940°, -98.174° | 6.3 km | - | - | - | ✓ Reviewed | USGS → |
On October 23, 2023 at 23:57 UTC, a magnitude 2.1 earthquake struck 15 km WSW of Falls City, Texas. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-23 2023-10-23 23:24:47 UTC | 5.4mb | 36 km ENE of Bulolo, Papua New Guinea -7.051°, 146.930° | 56.2 km | 2 | IV | green | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 5.4 earthquake 36 km ENE of Bulolo, Papua New Guinea with origin time 23:24 UTC on October 23, 2023. The USGS PAGER system assigned a green alert level for this event, signalling no significant casualties or damage expected. See the M5.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-23 2023-10-23 23:05:24 UTC | 5.9mww | 59 km SW of Yonakuni, Japan 24.041°, 122.638° | 31.0 km | 51 | IV | green | ✓ Reviewed | USGS → |
A magnitude 5.9 earthquake was recorded 59 km SW of Yonakuni, Japan on October 23, 2023 at 23:05 UTC. The USGS PAGER system assigned a green alert level for this event, signalling no significant casualties or damage expected. The event was offshore. See the M5.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-23 2023-10-23 23:02:13 UTC | 5.1mb | Kermadec Islands, New Zealand -29.937°, -177.489° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
At 23:02 UTC on October 23, 2023, a magnitude 5.1 tremor occurred near Kermadec Islands, New Zealand. This event falls inside the aftershock decay of a nearby magnitude 6.0 earthquake that occurred about 13 hours earlier. See the M5.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-23 2023-10-23 22:57:05 UTC | 2.3md | 1 km NE of Indios, Puerto Rico 18.007°, -66.809° | 16.6 km | - | - | - | ✓ Reviewed | USGS → |
October 23, 2023 brought a magnitude 2.3 earthquake 1 km NE of Indios, Puerto Rico, logged at 22:57 UTC. It arrived roughly 10 hours after a larger magnitude 4.5 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-23 2023-10-23 22:47:56 UTC | 4.4mb | 82 km SSW of Singaparna, Indonesia -8.026°, 107.792° | 67.3 km | - | - | - | ✓ Reviewed | USGS → |
On October 23, 2023 at 22:47 UTC, a magnitude 4.4 earthquake struck 82 km SSW of Singaparna, Indonesia. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-23 2023-10-23 22:47:24 UTC | 4.4mb | 269 km NNE of Saga, China 31.439°, 86.609° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.4 earthquake was recorded 269 km NNE of Saga, China on October 23, 2023 at 22:47 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-23 2023-10-23 22:47:10 UTC | 4.3mb | 131 km SSW of Tambolaka, Indonesia -10.593°, 118.997° | 19.8 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.3 seismic event took place 131 km SSW of Tambolaka, Indonesia on October 23, 2023 at 22:47 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-23 2023-10-23 22:41:01 UTC | 2.2ml | 17 km E of Ferry, Alaska 64.002°, -148.754° | 0.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.2 event was detected 17 km E of Ferry, Alaska on October 23, 2023, with origin time 22:41 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. | ||||||||
2023-10-23 2023-10-23 22:18:38 UTC | 4.3mb | south of the Fiji Islands -23.822°, -176.947° | 152.4 km | - | - | - | ✓ Reviewed | USGS → |
October 23, 2023 brought a magnitude 4.3 earthquake south of the Fiji Islands, logged at 22:18 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-23 2023-10-23 22:10:23 UTC | 2.1md | 8 km ENE of Pāhala, Hawaii 19.223°, -155.403° | 30.8 km | - | - | - | Auto | USGS → |
A magnitude 2.1 earthquake was recorded 8 km ENE of Pāhala, Hawaii on October 23, 2023 at 22:10 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.3 earthquake that occurred about 2 hours earlier. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-23 2023-10-23 22:09:28 UTC | 2.1ml | 10 km SSW of Volcano, Hawaii 19.367°, -155.286° | 2.3 km | - | - | - | ✓ Reviewed | USGS → |
On October 23, 2023 at 22:09 UTC, a magnitude 2.1 earthquake struck 10 km SSW of Volcano, Hawaii. 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. | ||||||||
2023-10-23 2023-10-23 22:07:45 UTC | 4.1mb | 27 km NNE of Waikawa, New Zealand -41.039°, 174.182° | 59.8 km | 10 | - | - | ✓ Reviewed | USGS → |
A magnitude 4.1 seismic event took place 27 km NNE of Waikawa, New Zealand on October 23, 2023 at 22:07 UTC. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-23 2023-10-23 22:06:22 UTC | 2.1ml | 34 km NNW of Chase, Alaska 62.754°, -150.237° | 83.2 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.1 earthquake was recorded 34 km NNW of Chase, Alaska on October 23, 2023 at 22:06 UTC. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-23 2023-10-23 21:59:04 UTC | 3.5md | 1 km SSE of Indios, Puerto Rico 17.982°, -66.811° | 9.0 km | 1 | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 3.5 earthquake 1 km SSE of Indios, Puerto Rico came in on October 23, 2023 at 21:59 UTC. Coming 9 hours after a magnitude 4.5 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M3.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-23 2023-10-23 21:20:39 UTC | 4.2mb | 11 km SW of Orcopampa, Peru -15.329°, -72.423° | 121.2 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.2 earthquake 11 km SW of Orcopampa, Peru at 21:20 UTC on October 23, 2023. The event was offshore. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-23 2023-10-23 21:10:13 UTC | 4.0mb | 173 km ESE of Attu Station, Alaska 52.009°, 175.345° | 54.6 km | - | - | - | ✓ Reviewed | USGS → |
On October 23, 2023 at 21:10 UTC, a magnitude 4.0 earthquake struck 173 km ESE of Attu Station, Alaska. See the M4.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-23 2023-10-23 21:04:28 UTC | 2.2md | 0 km NNE of Stuarts Draft, Virginia 38.038°, -79.030° | 8.5 km | 68 | - | - | ✓ Reviewed | USGS → |
At 21:04 UTC on October 23, 2023, a magnitude 2.2 tremor occurred 0 km NNE of Stuarts Draft, Virginia. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-23 2023-10-23 20:46:00 UTC | 2.6ml | 88 km SE of Adak, Alaska 51.394°, -175.613° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
On October 23, 2023, worldwide seismic activity registered a magnitude 2.6 earthquake 88 km SE of Adak, Alaska at 20:46 UTC. The event was offshore. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-23 2023-10-23 20:35:22 UTC | 4.6mb | southeast of the Loyalty Islands -23.297°, 170.818° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
October 23, 2023 brought a magnitude 4.6 earthquake southeast of the Loyalty Islands, logged at 20:35 UTC. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-23 2023-10-23 20:33:18 UTC | 2.0md | 2 km W of Guayanilla, Puerto Rico 18.019°, -66.816° | 12.7 km | - | - | - | ✓ Reviewed | USGS → |
On October 23, 2023, worldwide seismic activity registered a magnitude 2.0 earthquake 2 km W of Guayanilla, Puerto Rico at 20:33 UTC. It arrived roughly 8 hours after a larger magnitude 4.5 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. | ||||||||
2023-10-23 2023-10-23 20:31:12 UTC | 2.3md | 1 km SW of Pāhala, Hawaii 19.192°, -155.490° | 33.3 km | - | - | - | Auto | USGS → |
On October 23, 2023, worldwide seismic activity registered a magnitude 2.3 earthquake 1 km SW of Pāhala, Hawaii at 20:31 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 M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-23 2023-10-23 20:29:39 UTC | 3.0ml | 202 km SE of Akutan, Alaska 52.678°, -163.955° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 3.0 earthquake 202 km SE of Akutan, Alaska at 20:29 UTC on October 23, 2023. The event was offshore. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-23 2023-10-23 20:12:13 UTC | 3.0md | Mona Passage 18.876°, -67.177° | 20.8 km | - | - | - | ✓ Reviewed | USGS → |
At 20:12 UTC on October 23, 2023, a magnitude 3.0 tremor occurred near Mona Passage. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-23 2023-10-23 20:05:46 UTC | 3.9mb | 10 km NE of Akkeshi, Japan 43.111°, 144.924° | 109.1 km | 1 | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 3.9 earthquake 10 km NE of Akkeshi, Japan with origin time 20:05 UTC on October 23, 2023. The event was offshore. See the M3.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-23 2023-10-23 19:50:32 UTC | 4.4mb | 190 km ESE of Nabire, Indonesia -4.304°, 136.936° | 7.5 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.4 earthquake 190 km ESE of Nabire, Indonesia with origin time 19:50 UTC on October 23, 2023. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-23 2023-10-23 19:45:55 UTC | 2.1ml | 157 km WSW of Adak, Alaska 51.126°, -178.552° | 25.6 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.1 earthquake 157 km WSW of Adak, Alaska with origin time 19:45 UTC on October 23, 2023. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-23 2023-10-23 19:32:30 UTC | 2.6md | Puerto Rico region 17.971°, -66.808° | 15.9 km | - | - | - | ✓ Reviewed | USGS → |
On October 23, 2023 at 19:32 UTC, a magnitude 2.6 earthquake struck in the Puerto Rico region. Coming 7 hours after a magnitude 4.5 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-23 2023-10-23 19:16:28 UTC | 4.4mb | South Sandwich Islands region -56.347°, -27.711° | 115.0 km | - | - | - | ✓ Reviewed | USGS → |
On October 23, 2023, worldwide seismic activity registered a magnitude 4.4 earthquake in the South Sandwich Islands region at 19:16 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-10-23 2023-10-23 19:11:56 UTC | 2.5md | 3 km N of Almanor, CA 40.246°, -121.171° | 4.8 km | - | - | - | ✓ Reviewed | USGS → |
October 23, 2023 brought a magnitude 2.5 earthquake 3 km N of Almanor, CA, logged at 19:11 UTC. 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. | ||||||||
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 23, 2023. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.