Earthquakes on September 28, 2023
324
EARTHQUAKES on September 28, 2023
24-hour UTC period · USGS data
125 km deep · 8 people felt it
Elevated activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
5
M4.0–4.9
36
M3.0–3.9
12
M2.0–2.9
79
M1.0–1.9
192
Activity Summary
324
Total earthquakes
~250
Daily average
Elevated
Activity level
5
M5.0+ events
Geographic Breakdown
By US State
Top Countries (International)
Significant Earthquakes (M4.5+)
6.1
62 km E of Luganville, Vanuatu
14:40 UTC · 125.0 km deep
Felt by 8
5.8
117 km SSE of Kuril’sk, Russia
17:40 UTC · 30.0 km deep
5.7
117 km SSE of Kokopo, Papua New Guinea
19:21 UTC · 27.0 km deep
5.0
50 km NW of Kandrian, Papua New Guinea
19:43 UTC · 92.4 km deep
5.0
97 km NNE of Hihifo, Tonga
01:43 UTC · 16.1 km deep
Felt by 1
4.9
Fiji region
23:27 UTC · 595.6 km deep
4.9
26 km SSW of Finschhafen, Papua New Guinea
19:45 UTC · 63.8 km deep
4.9
20 km ENE of Aras-asan, Philippines
17:06 UTC · 68.2 km deep
Earthquake Map — September 28, 2023
All Earthquakes — September 28, 2023
Showing 30 of 132 (filtered from 324)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2023-09-28 2023-09-28 23:56:55 UTC | 3.0ml | 47 km NW of Valdez, Alaska 61.442°, -146.955° | 12.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 3.0 earthquake was recorded 47 km NW of Valdez, Alaska on September 28, 2023 at 23:56 UTC. The event was offshore. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-28 2023-09-28 23:44:53 UTC | 2.5ml | 40 km ENE of Maneadero, B.C., MX 31.825°, -116.160° | 5.4 km | - | - | - | ✓ Reviewed | USGS → |
On September 28, 2023 at 23:44 UTC, a magnitude 2.5 earthquake struck 40 km ENE of Maneadero, B.C., MX. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-28 2023-09-28 23:27:48 UTC | 4.9mb | Fiji region -19.315°, -177.956° | 595.6 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.9 earthquake in the Fiji region at 23:27 UTC on September 28, 2023. This is the deepest earthquake in the current dataset — a deep-focus event. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-28 2023-09-28 23:15:44 UTC | 4.1mb | Davis Strait 61.304°, -59.456° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.1 earthquake near Davis Strait came in on September 28, 2023 at 23:15 UTC. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-28 2023-09-28 23:13:06 UTC | 2.8ml | 4 km W of Ridgeway, Alaska 60.536°, -151.170° | 75.7 km | 1 | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.8 earthquake 4 km W of Ridgeway, Alaska came in on September 28, 2023 at 23:13 UTC. The event was offshore. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-28 2023-09-28 22:40:40 UTC | 2.2ml | 73 km WSW of Cantwell, Alaska 63.227°, -150.379° | 112.2 km | - | - | - | ✓ Reviewed | USGS → |
At 22:40 UTC on September 28, 2023, a magnitude 2.2 tremor occurred 73 km WSW of Cantwell, Alaska. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-28 2023-09-28 22:21:12 UTC | 2.9ml | 40 km S of Sand Point, Alaska 54.971°, -160.433° | 34.3 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.9 earthquake 40 km S of Sand Point, Alaska at 22:21 UTC on September 28, 2023. The event was offshore. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-28 2023-09-28 22:09:14 UTC | 2.3ml(texnet) | 58 km S of Whites City, New Mexico 31.653°, -104.454° | 6.9 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.3 earthquake 58 km S of Whites City, New Mexico at 22:09 UTC on September 28, 2023. Coming 6 hours after a magnitude 2.7 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-28 2023-09-28 21:45:43 UTC | 3.2ml | 262 km NE of Dawson City, Canada 65.460°, -134.996° | 29.7 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 3.2 event was detected 262 km NE of Dawson City, Canada on September 28, 2023, with origin time 21:45 UTC. The event was offshore. See the M3.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-28 2023-09-28 21:44:33 UTC | 2.0ml | 89 km NNW of Karluk, Alaska 58.274°, -155.178° | 24.1 km | - | - | - | ✓ Reviewed | USGS → |
September 28, 2023 brought a magnitude 2.0 earthquake 89 km NNW of Karluk, Alaska, logged at 21:44 UTC. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-28 2023-09-28 21:43:24 UTC | 2.0ml | 87 km NNW of Karluk, Alaska 58.264°, -155.133° | 29.8 km | - | - | - | ✓ Reviewed | USGS → |
On September 28, 2023 at 21:43 UTC, a magnitude 2.0 earthquake struck 87 km NNW of Karluk, Alaska. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-28 2023-09-28 21:43:13 UTC | 2.3ml | 265 km NE of Dawson City, Canada 65.569°, -135.110° | 29.4 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.3 event was detected 265 km NE of Dawson City, Canada on September 28, 2023, with origin time 21:43 UTC. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-28 2023-09-28 21:31:24 UTC | 2.0ml | Alaska Peninsula 56.026°, -159.814° | 98.1 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.0 earthquake was recorded near Alaska Peninsula on September 28, 2023 at 21:31 UTC. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-28 2023-09-28 21:19:59 UTC | 2.0ml | 90 km SSE of Sand Point, Alaska 54.597°, -159.906° | 25.6 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.0 earthquake 90 km SSE of Sand Point, Alaska with origin time 21:19 UTC on September 28, 2023. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-28 2023-09-28 21:12:00 UTC | 4.6mb | 114 km SSE of Kokopo, Papua New Guinea -5.271°, 152.732° | 31.3 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.6 earthquake 114 km SSE of Kokopo, Papua New Guinea with origin time 21:12 UTC on September 28, 2023. It arrived roughly 2 hours after a larger magnitude 5.7 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-28 2023-09-28 21:08:30 UTC | 3.3ml | 118 km NNE of Arctic Village, Alaska 69.132°, -144.626° | 14.2 km | - | - | - | ✓ Reviewed | USGS → |
At 21:08 UTC on September 28, 2023, a magnitude 3.3 tremor occurred 118 km NNE of Arctic Village, Alaska. See the M3.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-28 2023-09-28 20:33:26 UTC | 2.0ml | 5 km NNE of Sweet Home, Oregon 44.443°, -122.723° | -0.8 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.0 seismic event took place 5 km NNE of Sweet Home, Oregon on September 28, 2023 at 20:33 UTC. 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. | ||||||||
2023-09-28 2023-09-28 19:55:16 UTC | 2.4ml | 174 km WNW of Whitehorse, Canada 61.565°, -137.774° | 7.6 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.4 earthquake 174 km WNW of Whitehorse, Canada came in on September 28, 2023 at 19:55 UTC. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-28 2023-09-28 19:46:18 UTC | 4.6mb | 52 km SW of Acajutla, El Salvador 13.268°, -90.175° | 66.6 km | 3 | - | - | ✓ Reviewed | USGS → |
On September 28, 2023, worldwide seismic activity registered a magnitude 4.6 earthquake 52 km SW of Acajutla, El Salvador at 19:46 UTC. The event was offshore. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-28 2023-09-28 19:45:16 UTC | 4.9mb | 26 km SSW of Finschhafen, Papua New Guinea -6.784°, 147.777° | 63.8 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.9 event was detected 26 km SSW of Finschhafen, Papua New Guinea on September 28, 2023, with origin time 19:45 UTC. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-28 2023-09-28 19:43:37 UTC | 5.0mb | 50 km NW of Kandrian, Papua New Guinea -5.918°, 149.191° | 92.4 km | - | - | - | ✓ Reviewed | USGS → |
On September 28, 2023, worldwide seismic activity registered a magnitude 5.0 earthquake 50 km NW of Kandrian, Papua New Guinea at 19:43 UTC. The event was offshore. See the M5.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-28 2023-09-28 19:43:28 UTC | 2.6ml | 96 km WNW of Atka, Alaska 52.658°, -175.395° | 198.1 km | - | - | - | ✓ Reviewed | USGS → |
On September 28, 2023 at 19:43 UTC, a magnitude 2.6 earthquake struck 96 km WNW of Atka, Alaska. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-28 2023-09-28 19:39:06 UTC | 4.5mb | 128 km SSE of Kokopo, Papua New Guinea -5.335°, 152.863° | 25.6 km | - | - | - | ✓ Reviewed | USGS → |
September 28, 2023 brought a magnitude 4.5 earthquake 128 km SSE of Kokopo, Papua New Guinea, logged at 19:39 UTC. This event falls inside the aftershock decay of a nearby magnitude 5.7 earthquake that occurred about 1 hours earlier. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-28 2023-09-28 19:29:53 UTC | 2.0ml | 35 km W of Happy Valley, Alaska 59.957°, -152.371° | 78.4 km | - | - | - | ✓ Reviewed | USGS → |
On September 28, 2023, worldwide seismic activity registered a magnitude 2.0 earthquake 35 km W of Happy Valley, Alaska at 19:29 UTC. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-28 2023-09-28 19:22:06 UTC | 4.0mb | 104 km ENE of Khorugh, Tajikistan 37.996°, 72.554° | 126.7 km | - | - | - | ✓ Reviewed | USGS → |
September 28, 2023 brought a magnitude 4.0 earthquake 104 km ENE of Khorugh, Tajikistan, logged at 19:22 UTC. See the M4.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-28 2023-09-28 19:21:14 UTC | 5.7mww | 117 km SSE of Kokopo, Papua New Guinea -5.253°, 152.823° | 27.0 km | - | IV | green | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 5.7 earthquake 117 km SSE of Kokopo, Papua New Guinea with origin time 19:21 UTC on September 28, 2023. The USGS PAGER system assigned a green alert level for this event, signalling no significant casualties or damage expected. See the M5.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-28 2023-09-28 18:45:37 UTC | 2.1ml | 12 km S of Volcano, Hawaii 19.328°, -155.242° | 7.1 km | - | - | - | Auto | USGS → |
On September 28, 2023 at 18:45 UTC, a magnitude 2.1 earthquake struck 12 km S of Volcano, Hawaii. Coming 1 hours after a magnitude 2.4 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. | ||||||||
2023-09-28 2023-09-28 18:45:31 UTC | 2.4ml | Island of Hawaii, Hawaii 19.327°, -155.253° | 31.1 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.4 earthquake near Island of Hawaii, Hawaii at 18:45 UTC on September 28, 2023. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-28 2023-09-28 18:20:30 UTC | 2.9ml | Rat Islands, Aleutian Islands, Alaska 50.414°, 178.542° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.9 event was detected near Rat Islands, Aleutian Islands, Alaska on September 28, 2023, with origin time 18:20 UTC. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-09-28 2023-09-28 18:19:12 UTC | 4.4mb | Fiji region -19.207°, -177.602° | 553.4 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.4 event was detected in the Fiji region on September 28, 2023, with origin time 18:19 UTC. This deep-focus earthquake originated far below the brittle crust, deep inside the mantle. 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 September 28, 2023. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.