Earthquakes on July 31, 2023
237
EARTHQUAKES on July 31, 2023
24-hour UTC period · USGS data
118 km deep
Normal activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
0
M4.0–4.9
27
M3.0–3.9
11
M2.0–2.9
37
M1.0–1.9
162
Activity Summary
237
Total earthquakes
~250
Daily average
Normal
Activity level
0
M5.0+ events
Geographic Breakdown
By US State
Top Countries (International)
Significant Earthquakes (M4.5+)
4.9
71 km E of Kimbe, Papua New Guinea
23:07 UTC · 118.3 km deep
4.8
5 km ESE of Santiago Tetepec, Mexico
21:51 UTC · 22.0 km deep
Felt by 3
4.8
124 km E of Miyako, Japan
21:12 UTC · 17.3 km deep
4.8
Off the coast of Aisen, Chile
04:07 UTC · 10.0 km deep
4.7
South Sandwich Islands region
08:46 UTC · 35.0 km deep
4.6
57 km NE of Qujing, China
17:56 UTC · 10.0 km deep
4.6
Kermadec Islands, New Zealand
06:30 UTC · 47.2 km deep
4.6
northern Mid-Atlantic Ridge
02:44 UTC · 10.0 km deep
Earthquake Map — July 31, 2023
All Earthquakes — July 31, 2023
Showing 30 of 75 (filtered from 237)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2023-07-31 2023-07-31 23:41:08 UTC | 2.0md | 3 km S of Guánica, Puerto Rico 17.942°, -66.903° | 12.8 km | - | - | - | ✓ Reviewed | USGS → |
On July 31, 2023, worldwide seismic activity registered a magnitude 2.0 earthquake 3 km S of Guánica, Puerto Rico at 23:41 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.6 earthquake that occurred about 20 hours earlier. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-31 2023-07-31 23:26:45 UTC | 2.2ml | 81 km SW of Kaktovik, Alaska 69.540°, -144.884° | 6.4 km | - | - | - | ✓ Reviewed | USGS → |
At 23:26 UTC on July 31, 2023, a magnitude 2.2 tremor occurred 81 km SW of Kaktovik, Alaska. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-31 2023-07-31 23:07:13 UTC | 4.9mb | 71 km E of Kimbe, Papua New Guinea -5.465°, 150.777° | 118.3 km | - | - | - | ✓ Reviewed | USGS → |
On July 31, 2023 at 23:07 UTC, a magnitude 4.9 earthquake struck 71 km E of Kimbe, Papua New Guinea. It is the largest earthquake currently listed for worldwide seismic activity on July 31, 2023. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-31 2023-07-31 22:49:11 UTC | 3.5ml | 78 km SE of Kokhanok, Alaska 58.873°, -153.962° | 10.2 km | 1 | III | - | ✓ Reviewed | USGS → |
A magnitude 3.5 seismic event took place 78 km SE of Kokhanok, Alaska on July 31, 2023 at 22:49 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 M3.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-31 2023-07-31 22:35:40 UTC | 2.6ml | 11 km NNE of Susitna North, Alaska 62.257°, -149.799° | 2.8 km | - | - | - | ✓ Reviewed | USGS → |
At 22:35 UTC on July 31, 2023, a magnitude 2.6 tremor occurred 11 km NNE of Susitna North, Alaska. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-31 2023-07-31 22:32:59 UTC | 4.4mb | 10 km ENE of Kamishihoro, Japan 43.275°, 143.400° | 136.8 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.4 earthquake 10 km ENE of Kamishihoro, Japan with origin time 22:32 UTC on July 31, 2023. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-31 2023-07-31 21:51:17 UTC | 4.8mb | 5 km ESE of Santiago Tetepec, Mexico 16.305°, -97.701° | 22.0 km | 3 | - | - | ✓ Reviewed | USGS → |
A magnitude 4.8 earthquake was recorded 5 km ESE of Santiago Tetepec, Mexico on July 31, 2023 at 21:51 UTC. See the M4.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-31 2023-07-31 21:29:07 UTC | 3.1ml | western Texas 32.835°, -100.945° | 5.3 km | 7 | - | - | ✓ Reviewed | USGS → |
At 21:29 UTC on July 31, 2023, a magnitude 3.1 tremor occurred near western Texas. See the M3.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-31 2023-07-31 21:12:47 UTC | 4.8mb | 124 km E of Miyako, Japan 39.641°, 143.389° | 17.3 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.8 earthquake 124 km E of Miyako, Japan with origin time 21:12 UTC on July 31, 2023. The event was offshore. See the M4.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-31 2023-07-31 21:07:29 UTC | 2.6ml | 55 km S of Whites City, New Mexico 31.676°, -104.431° | 6.2 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.6 earthquake 55 km S of Whites City, New Mexico at 21:07 UTC on July 31, 2023. It arrived roughly 12 hours after a larger magnitude 3.3 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-31 2023-07-31 20:55:29 UTC | 4.5mb | Antofagasta, Chile -22.179°, -68.717° | 115.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.5 seismic event took place near Antofagasta, Chile on July 31, 2023 at 20:55 UTC. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-31 2023-07-31 20:50:43 UTC | 2.4ml | 22 km SSE of Central, Alaska 65.386°, -144.639° | 0.6 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.4 event was detected 22 km SSE of Central, Alaska on July 31, 2023, with origin time 20:50 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-31 2023-07-31 20:29:35 UTC | 3.1ml | 76 km SSE of Adak, Alaska 51.214°, -176.340° | 20.4 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 3.1 earthquake 76 km SSE of Adak, Alaska at 20:29 UTC on July 31, 2023. See the M3.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-31 2023-07-31 19:18:09 UTC | 4.3mb | south of the Fiji Islands -23.262°, -179.445° | 576.2 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.3 earthquake south of the Fiji Islands at 19:18 UTC on July 31, 2023. This is the deepest earthquake in the current dataset — a deep-focus event. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-31 2023-07-31 19:11:50 UTC | 4.1mb | south of the Kermadec Islands -32.806°, -178.222° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.1 earthquake south of the Kermadec Islands with origin time 19:11 UTC on July 31, 2023. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-31 2023-07-31 19:05:47 UTC | 2.4ml | 12 km SE of Pāhala, Hawaii 19.123°, -155.391° | 30.9 km | - | - | - | ✓ Reviewed | USGS → |
At 19:05 UTC on July 31, 2023, a magnitude 2.4 tremor occurred 12 km SE of Pāhala, Hawaii. It arrived roughly 11 hours after a larger magnitude 2.7 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-31 2023-07-31 18:54:52 UTC | 2.0ml | 65 km WNW of Beatty, Nevada 37.058°, -117.476° | 5.7 km | - | - | - | ✓ Reviewed | USGS → |
At 18:54 UTC on July 31, 2023, a magnitude 2.0 tremor occurred 65 km WNW of Beatty, Nevada. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-31 2023-07-31 18:53:05 UTC | 2.5ml | 117 km SE of Akhiok, Alaska 56.123°, -152.965° | 5.5 km | - | - | - | ✓ Reviewed | USGS → |
July 31, 2023 brought a magnitude 2.5 earthquake 117 km SE of Akhiok, Alaska, logged at 18:53 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.1 earthquake that occurred about 1 hours earlier. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-31 2023-07-31 18:39:01 UTC | 2.5ml | 57 km N of Adak, Alaska 52.390°, -176.530° | 195.0 km | - | - | - | ✓ Reviewed | USGS → |
On July 31, 2023 at 18:39 UTC, a magnitude 2.5 earthquake struck 57 km N of Adak, Alaska. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-31 2023-07-31 18:34:01 UTC | 3.1ml | 114 km SE of Akhiok, Alaska 56.122°, -153.046° | 2.2 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 3.1 event was detected 114 km SE of Akhiok, Alaska on July 31, 2023, with origin time 18:34 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M3.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-31 2023-07-31 18:04:46 UTC | 3.3ml | 17 km E of Wright, Wyoming 43.772°, -105.271° | 0.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 3.3 earthquake was recorded 17 km E of Wright, Wyoming on July 31, 2023 at 18:04 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M3.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-31 2023-07-31 17:56:44 UTC | 4.6mb | 57 km NE of Qujing, China 25.868°, 104.168° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.6 earthquake 57 km NE of Qujing, China at 17:56 UTC on July 31, 2023. The event was offshore. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-31 2023-07-31 17:45:22 UTC | 3.4md | 42 km N of Punta Cana, Dominican Republic 18.958°, -68.345° | 6.1 km | - | - | - | ✓ Reviewed | USGS → |
On July 31, 2023 at 17:45 UTC, a magnitude 3.4 earthquake struck 42 km N of Punta Cana, Dominican Republic. The event was offshore. See the M3.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-31 2023-07-31 17:27:05 UTC | 2.8ml | Rat Islands, Aleutian Islands, Alaska 51.770°, 178.233° | 110.5 km | - | - | - | ✓ Reviewed | USGS → |
July 31, 2023 brought a magnitude 2.8 earthquake near Rat Islands, Aleutian Islands, Alaska, logged at 17:27 UTC. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-31 2023-07-31 16:57:33 UTC | 2.5ml | 105 km SE of King Cove, Alaska 54.436°, -161.086° | 5.2 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.5 earthquake was recorded 105 km SE of King Cove, Alaska on July 31, 2023 at 16:57 UTC. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-31 2023-07-31 16:21:39 UTC | 2.4ml | 60 km N of Karluk, Alaska 58.108°, -154.593° | 86.3 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.4 earthquake 60 km N of Karluk, Alaska came in on July 31, 2023 at 16:21 UTC. The event was offshore. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-31 2023-07-31 14:56:37 UTC | 4.3mb | 289 km W of Adak, Alaska 52.340°, 179.208° | 192.9 km | - | II | - | ✓ Reviewed | USGS → |
This magnitude 4.3 event was detected 289 km W of Adak, Alaska on July 31, 2023, with origin time 14:56 UTC. The event was offshore. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-31 2023-07-31 14:52:28 UTC | 2.6md | 6 km S of Emajagua, Puerto Rico 17.939°, -65.892° | 10.7 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.6 event was detected 6 km S of Emajagua, Puerto Rico on July 31, 2023, with origin time 14:52 UTC. The event was offshore. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-31 2023-07-31 14:36:50 UTC | 4.2mb | 205 km NNW of Palu, Indonesia 0.900°, 119.448° | 22.8 km | - | - | - | ✓ Reviewed | USGS → |
July 31, 2023 brought a magnitude 4.2 earthquake 205 km NNW of Palu, Indonesia, logged at 14:36 UTC. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-07-31 2023-07-31 14:20:09 UTC | 2.2ml | Rat Islands, Aleutian Islands, Alaska 50.101°, 179.715° | 26.3 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.2 earthquake near Rat Islands, Aleutian Islands, Alaska at 14:20 UTC on July 31, 2023. See the M2.2 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 31, 2023. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.