Earthquakes on August 28, 2023
268
EARTHQUAKES on August 28, 2023
24-hour UTC period · USGS data
500 km deep · 629 people felt it
Normal activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
5
M4.0–4.9
34
M3.0–3.9
6
M2.0–2.9
44
M1.0–1.9
179
Activity Summary
268
Total earthquakes
~250
Daily average
Normal
Activity level
5
M5.0+ events
Significant Earthquakes (M4.5+)
7.1
180 km NNE of Gili Air, Indonesia
19:55 UTC · 500.0 km deep
Felt by 629
5.7
156 km N of Pototano, Indonesia
20:08 UTC · 482.0 km deep
Felt by 8
5.5
180 km NNE of Gili Air, Indonesia
20:06 UTC · 514.1 km deep
05.3
Pulau-Pulau Talaud, Indonesia
17:59 UTC · 28.8 km deep
Felt by 5
5.0
68 km WNW of La Junta, Chile
23:25 UTC · 77.4 km deep
Felt by 1
4.9
7 km NNW of San José Lachiguirí, Mexico
22:32 UTC · 52.6 km deep
Felt by 8
4.9
75 km SSW of Pacocha, Peru
04:14 UTC · 35.0 km deep
Felt by 2
4.8
127 km ESE of Tomioka, Japan
09:08 UTC · 11.7 km deep
Earthquake Map — August 28, 2023
All Earthquakes — August 28, 2023
Showing 30 of 89 (filtered from 268)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2023-08-28 2023-08-28 23:55:01 UTC | 4.0mb | 283 km WNW of Houma, Tonga -20.287°, -177.860° | 515.5 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.0 earthquake 283 km WNW of Houma, Tonga came in on August 28, 2023 at 23:55 UTC. This deep-focus earthquake originated far below the brittle crust, deep inside the mantle. See the M4.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-28 2023-08-28 23:53:35 UTC | 2.6ml | Andreanof Islands, Aleutian Islands, Alaska 51.323°, -176.869° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.6 earthquake near Andreanof Islands, Aleutian Islands, Alaska at 23:53 UTC on August 28, 2023. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-28 2023-08-28 23:25:01 UTC | 5.0mwr | 68 km WNW of La Junta, Chile -43.802°, -73.219° | 77.4 km | 1 | - | - | ✓ Reviewed | USGS → |
At 23:25 UTC on August 28, 2023, a magnitude 5.0 tremor occurred 68 km WNW of La Junta, Chile. See the M5.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-28 2023-08-28 23:20:34 UTC | 4.4mb | Owen Fracture Zone region 13.908°, 57.022° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
August 28, 2023 brought a magnitude 4.4 earthquake in the Owen Fracture Zone region, logged at 23:20 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-28 2023-08-28 23:13:15 UTC | 2.5ml | 11 km NNE of Pāhala, Hawaii 19.300°, -155.438° | 29.7 km | - | - | - | ✓ Reviewed | USGS → |
On August 28, 2023 at 23:13 UTC, a magnitude 2.5 earthquake struck 11 km NNE of Pāhala, Hawaii. It arrived roughly 2 hours after a larger magnitude 2.6 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-28 2023-08-28 22:32:12 UTC | 4.9mb | 7 km NNW of San José Lachiguirí, Mexico 16.438°, -96.365° | 52.6 km | 8 | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.9 earthquake 7 km NNW of San José Lachiguirí, Mexico at 22:32 UTC on August 28, 2023. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-28 2023-08-28 22:20:12 UTC | 4.3mb | 117 km ESE of Port Blair, India 11.125°, 93.670° | 125.2 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.3 earthquake 117 km ESE of Port Blair, India at 22:20 UTC on August 28, 2023. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-28 2023-08-28 22:19:14 UTC | 3.2ml | 17 km ESE of Wright, Wyoming 43.717°, -105.277° | 0.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 3.2 earthquake 17 km ESE of Wright, Wyoming with origin time 22:19 UTC on August 28, 2023. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M3.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-28 2023-08-28 22:18:55 UTC | 4.2mb | 15 km S of Ocós, Guatemala 14.371°, -92.197° | 60.4 km | 3 | - | - | ✓ Reviewed | USGS → |
A magnitude 4.2 earthquake was recorded 15 km S of Ocós, Guatemala on August 28, 2023 at 22:18 UTC. The event was offshore. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-28 2023-08-28 22:10:19 UTC | 4.5mb | 50 km N of Limín Khersonísou, Greece 35.772°, 25.500° | 11.9 km | 2 | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.5 earthquake 50 km N of Limín Khersonísou, Greece at 22:10 UTC on August 28, 2023. The event was offshore. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-28 2023-08-28 22:06:27 UTC | 2.8ml | 195 km WSW of Port Orford, Oregon 42.377°, -126.827° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.8 earthquake 195 km WSW of Port Orford, Oregon came in on August 28, 2023 at 22:06 UTC. Coming 4 hours after a magnitude 3.8 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-28 2023-08-28 22:01:31 UTC | 4.6mb | 78 km ESE of King Cove, Alaska 54.749°, -161.228° | 54.4 km | 1 | II | - | ✓ Reviewed | USGS → |
August 28, 2023 brought a magnitude 4.6 earthquake 78 km ESE of King Cove, Alaska, logged at 22:01 UTC. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-28 2023-08-28 20:51:14 UTC | 2.6ml | 23 km W of Volcano, Hawaii 19.457°, -155.453° | 8.9 km | - | - | - | ✓ Reviewed | USGS → |
August 28, 2023 brought a magnitude 2.6 earthquake 23 km W of Volcano, Hawaii, logged at 20:51 UTC. The event was offshore. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-28 2023-08-28 20:11:27 UTC | 2.4md | 18 km E of Willows, CA 39.538°, -121.986° | 28.1 km | - | - | - | ✓ Reviewed | USGS → |
On August 28, 2023, worldwide seismic activity registered a magnitude 2.4 earthquake 18 km E of Willows, CA at 20:11 UTC. The event was offshore. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-28 2023-08-28 20:08:06 UTC | 5.7mb | 156 km N of Pototano, Indonesia -7.027°, 117.212° | 482.0 km | 8 | I | green | ✓ Reviewed | USGS → |
A magnitude 5.7 earthquake was recorded 156 km N of Pototano, Indonesia on August 28, 2023 at 20:08 UTC. The USGS PAGER system assigned a green alert level for this event, signalling no significant casualties or damage expected. This deep-focus earthquake originated far below the brittle crust, deep inside the mantle. See the M5.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-28 2023-08-28 20:06:53 UTC | 5.5mb | 180 km NNE of Gili Air, Indonesia -6.816°, 116.614° | 514.1 km | - | I | green | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 5.5 earthquake 180 km NNE of Gili Air, Indonesia with origin time 20:06 UTC on August 28, 2023. Coming 1 hours after a magnitude 7.1 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. 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. | ||||||||
2023-08-28 2023-08-28 19:55:30 UTC | 7.1mww | 180 km NNE of Gili Air, Indonesia -6.789°, 116.521° | 500.0 km | 629 | III | green | ✓ Reviewed | USGS → |
On August 28, 2023 at 19:55 UTC, a magnitude 7.1 earthquake struck 180 km NNE of Gili Air, Indonesia. A tsunami evaluation was automatically initiated given the magnitude and location. The USGS PAGER system assigned a green alert level for this event, signalling no significant casualties or damage expected. See the M7.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-28 2023-08-28 19:06:26 UTC | 2.4md | 8 km SSW of Ridgemark, CA 36.746°, -121.388° | 11.3 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.4 earthquake 8 km SSW of Ridgemark, CA at 19:06 UTC on August 28, 2023. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-28 2023-08-28 17:59:43 UTC | 4.5mb | 259 km WNW of Houma, Tonga -20.423°, -177.668° | 528.8 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.5 event was detected 259 km WNW of Houma, Tonga on August 28, 2023, with origin time 17:59 UTC. This deep-focus earthquake originated far below the brittle crust, deep inside the mantle. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-28 2023-08-28 17:59:16 UTC | 5.3mww | Pulau-Pulau Talaud, Indonesia 4.367°, 126.505° | 28.8 km | 5 | III | green | ✓ Reviewed | USGS → |
On August 28, 2023, worldwide seismic activity registered a magnitude 5.3 earthquake near Pulau-Pulau Talaud, Indonesia at 17:59 UTC. The USGS PAGER system assigned a green alert level for this event, signalling no significant casualties or damage expected. See the M5.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-28 2023-08-28 17:57:39 UTC | 4.6mb | 114 km N of Hirara, Japan 25.823°, 125.112° | 147.4 km | - | - | - | ✓ Reviewed | USGS → |
On August 28, 2023 at 17:57 UTC, a magnitude 4.6 earthquake struck 114 km N of Hirara, Japan. The event was offshore. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-28 2023-08-28 17:51:11 UTC | 4.2mb | Molucca Sea 2.194°, 127.122° | 106.7 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.2 earthquake near Molucca Sea with origin time 17:51 UTC on August 28, 2023. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-28 2023-08-28 17:48:19 UTC | 4.3mb | 32 km NNW of Ancud, Chile -41.603°, -73.960° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.3 event was detected 32 km NNW of Ancud, Chile on August 28, 2023, with origin time 17:48 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-28 2023-08-28 17:42:06 UTC | 4.6mb | 11 km W of Espot, Spain 42.578°, 0.943° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.6 earthquake was recorded 11 km W of Espot, Spain on August 28, 2023 at 17:42 UTC. The event was offshore. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-28 2023-08-28 17:40:56 UTC | 3.8mb | 177 km W of Port Orford, Oregon 42.469°, -126.623° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
August 28, 2023 brought a magnitude 3.8 earthquake 177 km W of Port Orford, Oregon, logged at 17:40 UTC. The event was offshore. See the M3.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-28 2023-08-28 17:21:53 UTC | 2.7ml | 53 km SSW of Cantwell, Alaska 62.964°, -149.432° | 82.8 km | - | - | - | ✓ Reviewed | USGS → |
On August 28, 2023 at 17:21 UTC, a magnitude 2.7 earthquake struck 53 km SSW of Cantwell, Alaska. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-28 2023-08-28 16:47:12 UTC | 2.7ml | 85 km SE of King Cove, Alaska 54.563°, -161.306° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.7 earthquake was recorded 85 km SE of King Cove, Alaska on August 28, 2023 at 16:47 UTC. It arrived roughly 9 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 M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-28 2023-08-28 16:31:59 UTC | 2.3ml | 119 km SSW of Atka, Alaska 51.235°, -174.975° | 36.3 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.3 earthquake 119 km SSW of Atka, Alaska came in on August 28, 2023 at 16:31 UTC. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-28 2023-08-28 16:23:24 UTC | 4.2mb | Fiji region -21.205°, -179.055° | 600.7 km | - | - | - | ✓ Reviewed | USGS → |
On August 28, 2023, worldwide seismic activity registered a magnitude 4.2 earthquake in the Fiji region at 16:23 UTC. This is the deepest earthquake in the current dataset — a deep-focus event. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-28 2023-08-28 15:57:25 UTC | 2.3ml | 44 km E of Denali National Park, Alaska 63.469°, -150.847° | 12.5 km | 1 | - | - | ✓ Reviewed | USGS → |
A magnitude 2.3 seismic event took place 44 km E of Denali National Park, Alaska on August 28, 2023 at 15:57 UTC. The event was offshore. See the M2.3 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 August 28, 2023. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.