Earthquakes on August 4, 2026
280
EARTHQUAKES on August 4, 2026
24-hour UTC period · USGS data
34 km deep · 3 people felt it
Normal activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
2
M4.0–4.9
43
M3.0–3.9
25
M2.0–2.9
57
M1.0–1.9
153
Activity Summary
280
Total earthquakes
~250
Daily average
Normal
Activity level
2
M5.0+ events
Geographic Breakdown
By US State
Significant Earthquakes (M4.5+)
5.7
125 km NW of Ternate, Indonesia
20:16 UTC · 34.2 km deep
Felt by 3
5.0
south of Tonga
14:56 UTC · 10.0 km deep
4.8
62 km ESE of Koseda, Japan
19:56 UTC · 28.1 km deep
Felt by 1
4.8
south of Tonga
15:28 UTC · 10.0 km deep
4.7
South Sandwich Islands region
23:08 UTC · 10.0 km deep
4.7
Fiji region
20:30 UTC · 613.0 km deep
4.6
south of Tonga
21:09 UTC · 10.0 km deep
4.6
68 km ESE of Onagawa Chō, Japan
14:00 UTC · 46.1 km deep
Felt by 1
Earthquake Map — August 4, 2026
All Earthquakes — August 4, 2026
Showing 30 of 127 (filtered from 280)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2026-08-04 2026-08-04 23:32:54 UTC | 2.5ml | 61 km W of Nikolski, Alaska 52.841°, -169.760° | 13.8 km | - | - | - | ✓ Reviewed | USGS → |
At 23:32 UTC on August 4, 2026, a magnitude 2.5 tremor occurred 61 km W of Nikolski, Alaska. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 23:32:52 UTC | 2.4ml | 19 km E of Ferry, Alaska 64.029°, -148.709° | 1.4 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.4 earthquake was recorded 19 km E of Ferry, Alaska on August 4, 2026 at 23:32 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. | ||||||||
2026-08-04 2026-08-04 23:32:17 UTC | 4.3mb | 106 km NW of Bukittinggi, Indonesia 0.470°, 99.815° | 153.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 4, 2026, worldwide seismic activity registered a magnitude 4.3 earthquake 106 km NW of Bukittinggi, Indonesia at 23:32 UTC. The event was offshore. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 23:08:00 UTC | 4.7mb | South Sandwich Islands region -55.685°, -26.818° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
At 23:08 UTC on August 4, 2026, a magnitude 4.7 tremor occurred in the South Sandwich Islands region. See the M4.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 23:07:38 UTC | 2.2md | 1 km SSW of Guánica, Puerto Rico 17.956°, -66.913° | 14.8 km | - | - | - | ✓ Reviewed | USGS → |
On August 4, 2026, worldwide seismic activity registered a magnitude 2.2 earthquake 1 km SSW of Guánica, Puerto Rico at 23:07 UTC. Coming 23 hours after a magnitude 2.9 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 23:04:24 UTC | 2.0md | 7 km SSE of Maria Antonia, Puerto Rico 17.921°, -66.854° | 14.6 km | - | - | - | ✓ Reviewed | USGS → |
August 4, 2026 brought a magnitude 2.0 earthquake 7 km SSE of Maria Antonia, Puerto Rico, logged at 23:04 UTC. Coming 23 hours after a magnitude 2.9 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. | ||||||||
2026-08-04 2026-08-04 22:48:50 UTC | 2.6ml | 66 km SSW of Pelican, Alaska 57.451°, -136.807° | 23.2 km | - | - | - | ✓ Reviewed | USGS → |
August 4, 2026 brought a magnitude 2.6 earthquake 66 km SSW of Pelican, Alaska, logged at 22:48 UTC. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 22:28:57 UTC | 2.8ml | Rat Islands, Aleutian Islands, Alaska 51.396°, 178.564° | 52.7 km | - | - | - | ✓ Reviewed | USGS → |
August 4, 2026 brought a magnitude 2.8 earthquake near Rat Islands, Aleutian Islands, Alaska, logged at 22:28 UTC. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 22:18:54 UTC | 2.8ml | 31 km SW of Atka, Alaska 52.030°, -174.582° | 141.7 km | - | - | - | ✓ Reviewed | USGS → |
On August 4, 2026 at 22:18 UTC, a magnitude 2.8 earthquake struck 31 km SW of Atka, Alaska. The event was offshore. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 22:18:29 UTC | 4.1mb | Mariana Islands region 21.637°, 142.961° | 376.7 km | - | - | - | ✓ Reviewed | USGS → |
At 22:18 UTC on August 4, 2026, a magnitude 4.1 tremor occurred in the Mariana Islands region. This deep-focus earthquake originated far below the brittle crust, deep inside the mantle. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 22:06:31 UTC | 4.3mb | 111 km N of Isangel, Vanuatu -18.539°, 169.391° | 246.6 km | - | - | - | ✓ Reviewed | USGS → |
At 22:06 UTC on August 4, 2026, a magnitude 4.3 tremor occurred 111 km N of Isangel, Vanuatu. The event was offshore. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 22:04:15 UTC | 2.0md | 22 km NNE of San Ardo, CA 36.185°, -120.769° | 7.7 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.0 earthquake was recorded 22 km NNE of San Ardo, CA on August 4, 2026 at 22:04 UTC. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 22:03:30 UTC | 4.4mb | Mauritius - Reunion region -19.951°, 66.614° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.4 earthquake in the Mauritius - Reunion region at 22:03 UTC on August 4, 2026. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 22:02:09 UTC | 4.1mb | 41 km ENE of Noda, Japan 40.298°, 142.234° | 53.4 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.1 earthquake 41 km ENE of Noda, Japan at 22:02 UTC on August 4, 2026. Coming 14 hours after a magnitude 4.2 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 21:56:46 UTC | 4.1mb | 91 km SE of Gorontalo, Indonesia 0.003°, 123.692° | 121.1 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.1 event was detected 91 km SE of Gorontalo, Indonesia on August 4, 2026, with origin time 21:56 UTC. The event was offshore. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 21:17:33 UTC | 2.6md | 7 km ESE of Cloverdale, CA 38.791°, -122.938° | 5.1 km | 9 | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.6 earthquake 7 km ESE of Cloverdale, CA with origin time 21:17 UTC on August 4, 2026. In the 72 hours after this event, the USGS recorded 4 smaller earthquakes within 20 km, consistent with an ongoing aftershock sequence rooted here. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 21:09:29 UTC | 4.6mb | south of Tonga -24.299°, -175.257° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.6 event was detected south of Tonga on August 4, 2026, with origin time 21:09 UTC. It arrived roughly 6 hours after a larger magnitude 4.8 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. | ||||||||
2026-08-04 2026-08-04 21:08:55 UTC | 4.3mb | 64 km NE of Kuji, Japan 40.595°, 142.309° | 50.4 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.3 earthquake 64 km NE of Kuji, Japan at 21:08 UTC on August 4, 2026. The event was offshore. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 20:54:10 UTC | 2.5md | 15 km S of Hamilton City, CA 39.605°, -122.020° | 28.5 km | - | - | - | ✓ Reviewed | USGS → |
On August 4, 2026, worldwide seismic activity registered a magnitude 2.5 earthquake 15 km S of Hamilton City, CA at 20:54 UTC. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 20:53:19 UTC | 2.9ml | 256 km W of Adak, Alaska 51.989°, 179.648° | 197.9 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.9 earthquake was recorded 256 km W of Adak, Alaska on August 4, 2026 at 20:53 UTC. The event was offshore. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 20:44:43 UTC | 2.3md | 55 km W of Ferndale, CA 40.586°, -124.918° | 13.1 km | - | - | - | ✓ Reviewed | USGS → |
On August 4, 2026, worldwide seismic activity registered a magnitude 2.3 earthquake 55 km W of Ferndale, CA at 20:44 UTC. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 20:30:05 UTC | 4.7mb | Fiji region -21.762°, -179.428° | 613.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.7 earthquake in the Fiji region at 20:30 UTC on August 4, 2026. This deep-focus earthquake originated far below the brittle crust, deep inside the mantle. See the M4.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 20:22:04 UTC | 2.7ml | 90 km SSE of Atka, Alaska 51.489°, -173.541° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.7 earthquake 90 km SSE of Atka, Alaska with origin time 20:22 UTC on August 4, 2026. This event falls inside the aftershock decay of a nearby magnitude 4.3 earthquake that occurred about 5 hours earlier. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 20:16:37 UTC | 5.7mww | 125 km NW of Ternate, Indonesia 1.501°, 126.502° | 34.2 km | 3 | IV | green | ✓ Reviewed | USGS → |
On August 4, 2026 at 20:16 UTC, a magnitude 5.7 earthquake struck 125 km NW of Ternate, Indonesia. 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 August 4, 2026. See the M5.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 20:01:17 UTC | 4.5mb | 59 km SE of Koseda, Japan 30.067°, 131.146° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 4, 2026 at 20:01 UTC, a magnitude 4.5 earthquake struck 59 km SE of Koseda, Japan. This event falls inside the aftershock decay of a nearby magnitude 4.8 earthquake that occurred about 1 hours earlier. The event was offshore. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 19:56:56 UTC | 4.8mww | 62 km ESE of Koseda, Japan 30.095°, 131.202° | 28.1 km | 1 | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.8 earthquake 62 km ESE of Koseda, Japan with origin time 19:56 UTC on August 4, 2026. See the M4.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 19:55:24 UTC | 2.8md | 6 km NE of San Simeon, CA 35.681°, -121.137° | 7.2 km | 4 | - | - | ✓ Reviewed | USGS → |
A magnitude 2.8 earthquake was recorded 6 km NE of San Simeon, CA on August 4, 2026 at 19:55 UTC. The event was offshore. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 19:13:18 UTC | 2.1ml | 28 km SSE of Akutan, Alaska 53.917°, -165.543° | 111.1 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.1 event was detected 28 km SSE of Akutan, Alaska on August 4, 2026, with origin time 19:13 UTC. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 17:41:09 UTC | 4.2mb | 64 km ENE of Noda, Japan 40.367°, 142.501° | 38.9 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.2 seismic event took place 64 km ENE of Noda, Japan on August 4, 2026 at 17:41 UTC. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 17:34:07 UTC | 2.0ml | 22 km WSW of Petersville, Alaska 62.436°, -151.188° | 84.1 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.0 earthquake 22 km WSW of Petersville, Alaska with origin time 17:34 UTC on August 4, 2026. See the M2.0 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 4, 2026. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.