Earthquakes on July 28, 2023
268
EARTHQUAKES on July 28, 2023
24-hour UTC period · USGS data
89 km deep · 6 people felt it
Normal activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
7
M4.0–4.9
39
M3.0–3.9
7
M2.0–2.9
58
M1.0–1.9
157
Activity Summary
268
Total earthquakes
~250
Daily average
Normal
Activity level
7
M5.0+ events
Significant Earthquakes (M4.5+)
5.9
152 km SE of Port Blair, India
19:23 UTC · 88.9 km deep
Felt by 6
5.9
Southwest Indian Ridge
07:58 UTC · 10.0 km deep
5.5
South Sandwich Islands region
19:35 UTC · 37.3 km deep
5.5
Southwest Indian Ridge
07:03 UTC · 10.0 km deep
5.4
Southwest Indian Ridge
07:13 UTC · 10.0 km deep
5.0
66 km SE of Kokhanok, Alaska
19:11 UTC · 106.6 km deep
Felt by 195
5.0
233 km E of Levuka, Fiji
17:38 UTC · 598.8 km deep
4.9
Southwest Indian Ridge
07:25 UTC · 10.0 km deep
Earthquake Map — July 28, 2023
All Earthquakes — July 28, 2023
Showing 30 of 111 (filtered from 268)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2023-07-28 2023-07-28 23:58:17 UTC | 2.1ml | 78 km WNW of Tyonek, Alaska 61.303°, -152.516° | 0.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.1 earthquake 78 km WNW of Tyonek, Alaska at 23:58 UTC on July 28, 2023. 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. | ||||||||
2023-07-28 2023-07-28 23:57:52 UTC | 3.0md | Puerto Rico region 18.017°, -66.840° | 16.1 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 3.0 earthquake was recorded in the Puerto Rico region on July 28, 2023 at 23:57 UTC. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-28 2023-07-28 23:55:46 UTC | 4.7mb | 110 km WNW of Höfn, Iceland 64.610°, -17.351° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.7 earthquake 110 km WNW of Höfn, Iceland with origin time 23:55 UTC on July 28, 2023. See the M4.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-28 2023-07-28 23:42:14 UTC | 4.2mb | 119 km S of Akureyri, Iceland 64.632°, -17.582° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.2 earthquake 119 km S of Akureyri, Iceland at 23:42 UTC on July 28, 2023. The event was offshore. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-28 2023-07-28 23:38:42 UTC | 2.0ml | 12 km ENE of Fox, Alaska 64.985°, -147.373° | 0.0 km | - | - | - | ✓ Reviewed | USGS → |
At 23:38 UTC on July 28, 2023, a magnitude 2.0 tremor occurred 12 km ENE of Fox, Alaska. 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. | ||||||||
2023-07-28 2023-07-28 23:32:48 UTC | 4.4mb | 123 km SE of Katsuren-haebaru, Japan 25.615°, 128.816° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.4 earthquake 123 km SE of Katsuren-haebaru, Japan came in on July 28, 2023 at 23:32 UTC. The event was offshore. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-28 2023-07-28 22:49:46 UTC | 2.6ml | 82 km NNW of Karluk, Alaska 58.233°, -155.059° | 6.0 km | - | - | - | ✓ Reviewed | USGS → |
On July 28, 2023 at 22:49 UTC, a magnitude 2.6 earthquake struck 82 km NNW of Karluk, Alaska. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-28 2023-07-28 22:35:36 UTC | 2.2ml | 36 km NNW of Toyah, Texas 31.608°, -103.968° | 8.2 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.2 earthquake 36 km NNW of Toyah, Texas with origin time 22:35 UTC on July 28, 2023. This event falls inside the aftershock decay of a nearby magnitude 2.5 earthquake that occurred about 4 hours earlier. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-28 2023-07-28 22:34:03 UTC | 2.8md | 5 km WSW of Gu?nica, Puerto Rico 17.952°, -66.952° | 6.8 km | - | - | - | ✓ Reviewed | USGS → |
At 22:34 UTC on July 28, 2023, a magnitude 2.8 tremor occurred 5 km WSW of Gu?nica, Puerto Rico. It arrived roughly 19 hours after a larger magnitude 2.9 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-28 2023-07-28 22:27:42 UTC | 4.6mb | 82 km SW of Victor Raul, Peru -8.887°, -79.400° | 45.8 km | 1 | - | - | ✓ Reviewed | USGS → |
July 28, 2023 brought a magnitude 4.6 earthquake 82 km SW of Victor Raul, Peru, logged at 22:27 UTC. The event was offshore. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-28 2023-07-28 22:16:04 UTC | 4.4mb | 147 km SE of Sarangani, Philippines 4.377°, 126.313° | 103.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.4 seismic event took place 147 km SE of Sarangani, Philippines on July 28, 2023 at 22:16 UTC. The event was offshore. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-28 2023-07-28 22:02:54 UTC | 3.9md | 136 km NNW of The Valley, Anguilla 19.344°, -63.592° | 40.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 3.9 event was detected 136 km NNW of The Valley, Anguilla on July 28, 2023, with origin time 22:02 UTC. See the M3.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-28 2023-07-28 21:52:43 UTC | 2.4ml | 9 km E of Pāhala, Hawaii 19.200°, -155.384° | 31.5 km | - | - | - | Auto | USGS → |
This magnitude 2.4 event was detected 9 km E of Pāhala, Hawaii on July 28, 2023, with origin time 21:52 UTC. The event was offshore. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-28 2023-07-28 21:48:28 UTC | 2.2ml | 41 km WNW of Skwentna, Alaska 62.161°, -152.107° | 105.5 km | - | - | - | ✓ Reviewed | USGS → |
On July 28, 2023, worldwide seismic activity registered a magnitude 2.2 earthquake 41 km WNW of Skwentna, Alaska at 21:48 UTC. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-28 2023-07-28 21:41:23 UTC | 2.1ml | 52 km SSE of Unalaska, Alaska 53.449°, -166.189° | 53.5 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.1 event was detected 52 km SSE of Unalaska, Alaska on July 28, 2023, with origin time 21:41 UTC. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-28 2023-07-28 21:27:32 UTC | 4.3mb | 135 km E of Bitung, Indonesia 1.458°, 126.342° | 34.5 km | - | - | - | ✓ Reviewed | USGS → |
On July 28, 2023, worldwide seismic activity registered a magnitude 4.3 earthquake 135 km E of Bitung, Indonesia at 21:27 UTC. The event was offshore. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-28 2023-07-28 20:52:37 UTC | 2.5md | 2 km NNE of Canyondam, CA 40.191°, -121.069° | 7.4 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.5 earthquake 2 km NNE of Canyondam, CA came in on July 28, 2023 at 20:52 UTC. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-28 2023-07-28 20:36:13 UTC | 2.1ml | 98 km SW of Nikolski, Alaska 52.226°, -169.716° | 9.3 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.1 earthquake 98 km SW of Nikolski, Alaska came in on July 28, 2023 at 20:36 UTC. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-28 2023-07-28 20:19:52 UTC | 2.6ml | 190 km WSW of Pistol River, Oregon 41.772°, -126.599° | 13.5 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.6 earthquake was recorded 190 km WSW of Pistol River, Oregon on July 28, 2023 at 20:19 UTC. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-28 2023-07-28 19:55:31 UTC | 2.6ml | 63 km NNE of Chalkyitsik, Alaska 67.179°, -143.146° | 16.9 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.6 earthquake 63 km NNE of Chalkyitsik, Alaska with origin time 19:55 UTC on July 28, 2023. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-28 2023-07-28 19:35:01 UTC | 5.5mb | South Sandwich Islands region -58.765°, -25.190° | 37.3 km | - | III | green | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 5.5 earthquake in the South Sandwich Islands region with origin time 19:35 UTC on July 28, 2023. 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. | ||||||||
2023-07-28 2023-07-28 19:23:46 UTC | 5.9mww | 152 km SE of Port Blair, India 10.537°, 93.542° | 88.9 km | 6 | IV | green | ✓ Reviewed | USGS → |
On July 28, 2023 at 19:23 UTC, a magnitude 5.9 earthquake struck 152 km SE of Port Blair, India. The USGS PAGER system assigned a green alert level for this event, signalling no significant casualties or damage expected. It is the largest earthquake currently listed for worldwide seismic activity on July 28, 2023. See the M5.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-28 2023-07-28 19:11:22 UTC | 5.0mww | 66 km SE of Kokhanok, Alaska 59.004°, -153.977° | 106.6 km | 195 | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 5.0 earthquake 66 km SE of Kokhanok, Alaska at 19:11 UTC on July 28, 2023. The event was offshore. See the M5.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-28 2023-07-28 19:07:42 UTC | 4.6mb | 194 km NW of Sola, Vanuatu -12.601°, 166.321° | 56.4 km | - | - | - | ✓ Reviewed | USGS → |
On July 28, 2023 at 19:07 UTC, a magnitude 4.6 earthquake struck 194 km NW of Sola, Vanuatu. The event was offshore. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-28 2023-07-28 18:31:48 UTC | 2.2md | 3 km N of Vallejo, CA 38.142°, -122.231° | 9.2 km | 4 | - | - | ✓ Reviewed | USGS → |
A magnitude 2.2 earthquake was recorded 3 km N of Vallejo, CA on July 28, 2023 at 18:31 UTC. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-28 2023-07-28 18:20:53 UTC | 2.5ml | 38 km NNW of Toyah, Texas 31.615°, -103.990° | 8.4 km | 1 | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.5 earthquake 38 km NNW of Toyah, Texas at 18:20 UTC on July 28, 2023. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-28 2023-07-28 18:09:52 UTC | 2.1ml | 119 km SSW of Sand Point, Alaska 54.297°, -160.939° | 20.1 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.1 seismic event took place 119 km SSW of Sand Point, Alaska on July 28, 2023 at 18:09 UTC. Coming 4 hours after a magnitude 4.0 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-28 2023-07-28 17:47:24 UTC | 2.7ml | 122 km SW of Nikolski, Alaska 52.206°, -170.201° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.7 seismic event took place 122 km SW of Nikolski, Alaska on July 28, 2023 at 17:47 UTC. The event was offshore. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-28 2023-07-28 17:38:01 UTC | 5.0mb | 233 km E of Levuka, Fiji -17.965°, -178.478° | 598.8 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 5.0 event was detected 233 km E of Levuka, Fiji on July 28, 2023, with origin time 17:38 UTC. This is the deepest earthquake in the current dataset — a deep-focus event. See the M5.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-28 2023-07-28 17:34:01 UTC | 3.1ml | Alaska Peninsula 55.090°, -160.607° | 57.6 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 3.1 earthquake near Alaska Peninsula came in on July 28, 2023 at 17:34 UTC. See the M3.1 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 July 28, 2023. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.