Earthquakes on September 30, 2023
270
EARTHQUAKES on September 30, 2023
24-hour UTC period · USGS data
LARGEST: M5.8 — west of Macquarie Island
10 km deep
Normal activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
1
M4.0–4.9
39
M3.0–3.9
10
M2.0–2.9
49
M1.0–1.9
171
Activity Summary
270
Total earthquakes
~250
Daily average
Normal
Activity level
1
M5.0+ events
Geographic Breakdown
By US State
Top Countries (International)
Significant Earthquakes (M4.5+)
5.8
west of Macquarie Island
00:31 UTC · 10.0 km deep
4.9
47 km E of Kokopo, Papua New Guinea
23:30 UTC · 65.4 km deep
4.9
260 km SSW of Pelabuhanratu, Indonesia
06:33 UTC · 10.0 km deep
4.9
southeast of the Loyalty Islands
06:10 UTC · 86.8 km deep
4.8
235 km S of ‘Ohonua, Tonga
10:08 UTC · 10.0 km deep
4.7
South Sandwich Islands region
06:08 UTC · 10.0 km deep
4.7
3 km SW of Ferndale, CA
15:26 UTC · 17.9 km deep
Felt by 929
4.6
172 km WNW of Malango, Solomon Islands
20:36 UTC · 10.0 km deep
Earthquake Map — September 30, 2023
All Earthquakes — September 30, 2023
Showing 30 of 99 (filtered from 270)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2023-09-30 2023-09-30 23:41:39 UTC | 2.1ml | 83 km WSW of Atka, Alaska 51.903°, -175.318° | 75.1 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.1 earthquake 83 km WSW of Atka, Alaska at 23:41 UTC on September 30, 2023. This event falls inside the aftershock decay of a nearby magnitude 2.2 earthquake that occurred about 9 hours earlier. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-30 2023-09-30 23:30:30 UTC | 4.9mb | 47 km E of Kokopo, Papua New Guinea -4.343°, 152.700° | 65.4 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.9 earthquake was recorded 47 km E of Kokopo, Papua New Guinea on September 30, 2023 at 23:30 UTC. The event was offshore. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-30 2023-09-30 23:17:11 UTC | 2.0ml | 70 km NNE of White Mountain, Alaska 65.289°, -162.961° | 8.2 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.0 earthquake 70 km NNE of White Mountain, Alaska at 23:17 UTC on September 30, 2023. Coming 1 hours after a magnitude 2.1 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-30 2023-09-30 23:09:24 UTC | 2.5ml | 24 km W of Volcano, Hawaii 19.442°, -155.468° | 7.4 km | - | - | - | ✓ Reviewed | USGS → |
On September 30, 2023, worldwide seismic activity registered a magnitude 2.5 earthquake 24 km W of Volcano, Hawaii at 23:09 UTC. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-30 2023-09-30 23:09:13 UTC | 2.1ml | 70 km NNE of White Mountain, Alaska 65.275°, -162.923° | 13.2 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.1 event was detected 70 km NNE of White Mountain, Alaska on September 30, 2023, with origin time 23:09 UTC. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-30 2023-09-30 23:08:48 UTC | 2.1ml | 66 km NNE of White Mountain, Alaska 65.256°, -163.022° | 8.4 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.1 earthquake 66 km NNE of White Mountain, Alaska came in on September 30, 2023 at 23:08 UTC. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-30 2023-09-30 22:55:30 UTC | 2.6md | 9 km SSE of Maria Antonia, Puerto Rico 17.907°, -66.848° | 11.6 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.6 seismic event took place 9 km SSE of Maria Antonia, Puerto Rico on September 30, 2023 at 22:55 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.0 earthquake that occurred about 1 hours earlier. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-30 2023-09-30 22:44:33 UTC | 3.0md | 8 km SSE of Maria Antonia, Puerto Rico 17.916°, -66.847° | 9.6 km | - | - | - | ✓ Reviewed | USGS → |
On September 30, 2023 at 22:44 UTC, a magnitude 3.0 earthquake struck 8 km SSE of Maria Antonia, Puerto Rico. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-30 2023-09-30 22:24:46 UTC | 3.1ml | 56 km WSW of Anchor Point, Alaska 59.641°, -152.793° | 100.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 3.1 earthquake 56 km WSW of Anchor Point, Alaska at 22:24 UTC on September 30, 2023. See the M3.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-30 2023-09-30 22:05:21 UTC | 4.4mb | Izu Islands, Japan region 30.759°, 141.894° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
At 22:05 UTC on September 30, 2023, a magnitude 4.4 tremor occurred in the Izu Islands, Japan region. Coming 4 hours after a magnitude 4.5 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-30 2023-09-30 21:58:04 UTC | 2.1ml | 189 km WSW of Adak, Alaska 51.334°, -179.233° | 23.4 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.1 seismic event took place 189 km WSW of Adak, Alaska on September 30, 2023 at 21:58 UTC. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-30 2023-09-30 21:49:36 UTC | 2.4ml | 53 km SSE of Perryville, Alaska 55.458°, -158.849° | 46.6 km | - | - | - | ✓ Reviewed | USGS → |
September 30, 2023 brought a magnitude 2.4 earthquake 53 km SSE of Perryville, Alaska, logged at 21:49 UTC. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-30 2023-09-30 21:30:08 UTC | 4.1mb | 4 km SSW of Kadzhi-Say, Kyrgyzstan 42.106°, 77.164° | 10.0 km | 3 | - | - | ✓ Reviewed | USGS → |
A magnitude 4.1 earthquake was recorded 4 km SSW of Kadzhi-Say, Kyrgyzstan on September 30, 2023 at 21:30 UTC. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-30 2023-09-30 21:28:39 UTC | 4.4mb | 75 km NNE of Ollagüe, Chile -20.612°, -67.943° | 171.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.4 earthquake 75 km NNE of Ollagüe, Chile at 21:28 UTC on September 30, 2023. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-30 2023-09-30 20:56:36 UTC | 4.4mb | 30 km SSW of Negara, Indonesia -8.624°, 114.562° | 113.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.4 event was detected 30 km SSW of Negara, Indonesia on September 30, 2023, with origin time 20:56 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-30 2023-09-30 20:39:40 UTC | 2.0ml(texnet) | 8 km NE of Hermleigh, Texas 32.680°, -100.692° | 7.2 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.0 event was detected 8 km NE of Hermleigh, Texas on September 30, 2023, with origin time 20:39 UTC. It arrived roughly 15 hours after a larger magnitude 3.1 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. | ||||||||
2023-09-30 2023-09-30 20:36:40 UTC | 4.6mb | 172 km WNW of Malango, Solomon Islands -9.063°, 158.280° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.6 earthquake 172 km WNW of Malango, Solomon Islands came in on September 30, 2023 at 20:36 UTC. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-30 2023-09-30 20:24:00 UTC | 4.1mb | 138 km SW of Aitape, Papua New Guinea -4.031°, 141.476° | 92.3 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.1 earthquake 138 km SW of Aitape, Papua New Guinea with origin time 20:24 UTC on September 30, 2023. The event was offshore. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-30 2023-09-30 20:04:35 UTC | 2.9ml | 64 km ESE of Nikolski, Alaska 52.783°, -167.934° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.9 earthquake was recorded 64 km ESE of Nikolski, Alaska on September 30, 2023 at 20:04 UTC. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-30 2023-09-30 19:58:21 UTC | 2.1md | 17 km SW of Ferndale, CA 40.489°, -124.423° | 26.4 km | - | - | - | ✓ Reviewed | USGS → |
At 19:58 UTC on September 30, 2023, a magnitude 2.1 tremor occurred 17 km SW of Ferndale, CA. It arrived roughly 5 hours after a larger magnitude 4.7 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. | ||||||||
2023-09-30 2023-09-30 19:14:05 UTC | 4.6mb | 37 km SW of Hihifo, Tonga -16.210°, -174.029° | 111.7 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.6 seismic event took place 37 km SW of Hihifo, Tonga on September 30, 2023 at 19:14 UTC. The event was offshore. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-30 2023-09-30 18:40:51 UTC | 3.4md | 8 km S of Orocovis, Puerto Rico 18.150°, -66.395° | 5.0 km | 4 | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 3.4 earthquake 8 km S of Orocovis, Puerto Rico with origin time 18:40 UTC on September 30, 2023. The event was offshore. See the M3.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-30 2023-09-30 18:21:08 UTC | 4.3mb | Fiji region -21.257°, -178.844° | 538.4 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.3 earthquake in the Fiji region with origin time 18:21 UTC on September 30, 2023. This deep-focus earthquake originated far below the brittle crust, deep inside the mantle. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-30 2023-09-30 18:20:04 UTC | 2.1ml | 85 km SE of False Pass, Alaska 54.285°, -162.523° | 6.7 km | - | - | - | ✓ Reviewed | USGS → |
September 30, 2023 brought a magnitude 2.1 earthquake 85 km SE of False Pass, Alaska, logged at 18:20 UTC. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-30 2023-09-30 18:17:27 UTC | 4.6mb | 91 km SSE of Lata, Solomon Islands -11.466°, 166.170° | 77.9 km | - | - | - | ✓ Reviewed | USGS → |
September 30, 2023 brought a magnitude 4.6 earthquake 91 km SSE of Lata, Solomon Islands, logged at 18:17 UTC. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-30 2023-09-30 18:09:00 UTC | 4.4mb | 136 km E of Yamada, Japan 39.515°, 143.534° | 19.6 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.4 earthquake 136 km E of Yamada, Japan came in on September 30, 2023 at 18:09 UTC. The event was offshore. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-30 2023-09-30 17:53:24 UTC | 4.2mwr | 75 km WNW of La Ligua, Chile -32.176°, -71.964° | 19.5 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.2 earthquake 75 km WNW of La Ligua, Chile came in on September 30, 2023 at 17:53 UTC. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-30 2023-09-30 17:44:06 UTC | 4.3mwr | 84 km W of San Antonio, Chile -33.708°, -72.513° | 7.4 km | - | - | - | ✓ Reviewed | USGS → |
On September 30, 2023, worldwide seismic activity registered a magnitude 4.3 earthquake 84 km W of San Antonio, Chile at 17:44 UTC. The event was offshore. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-30 2023-09-30 17:41:58 UTC | 4.5mb | Izu Islands, Japan region 30.810°, 141.808° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On September 30, 2023 at 17:41 UTC, a magnitude 4.5 earthquake struck in the Izu Islands, Japan region. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-30 2023-09-30 17:25:19 UTC | 2.6md | 17 km WSW of Ferndale, CA 40.508°, -124.443° | 29.6 km | 2 | - | - | ✓ Reviewed | USGS → |
September 30, 2023 brought a magnitude 2.6 earthquake 17 km WSW of Ferndale, CA, logged at 17:25 UTC. Coming 2 hours after a magnitude 4.7 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. | ||||||||
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 30, 2023. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.