Earthquakes on August 4, 2026
247
EARTHQUAKES on August 4, 2026
24-hour UTC period · USGS data
35 km deep · 3 people felt it
Normal activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
2
M4.0–4.9
17
M3.0–3.9
28
M2.0–2.9
54
M1.0–1.9
146
Activity Summary
247
Total earthquakes
~250
Daily average
Normal
Activity level
2
M5.0+ events
Geographic Breakdown
By US State
Significant Earthquakes (M4.5+)
5.7
127 km NW of Ternate, Indonesia
20:16 UTC · 35.0 km deep
Felt by 3
5.1
south of Tonga
14:56 UTC · 10.0 km deep
4.8
43 km ESE of Koseda, Japan
19:56 UTC · 45.0 km deep
Felt by 1
4.7
Fiji region
20:30 UTC · 603.0 km deep
4.6
79 km E of Onagawa Chō, Japan
14:00 UTC · 40.4 km deep
Felt by 1
4.6
112 km WSW of Puerto Madero, Mexico
07:07 UTC · 10.0 km deep
Earthquake Map — August 4, 2026
All Earthquakes — August 4, 2026
Showing 30 of 101 (filtered from 247)
(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 → |
On August 4, 2026 at 23:32 UTC, a magnitude 2.5 earthquake struck 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 → |
This magnitude 2.4 event was detected 19 km E of Ferry, Alaska on August 4, 2026, with origin time 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 23:07:38 UTC | 2.2md | 1 km SSW of Guánica, Puerto Rico 17.956°, -66.913° | 14.8 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.2 earthquake 1 km SSW of Guánica, Puerto Rico came in on August 4, 2026 at 23:07 UTC. It arrived roughly 23 hours after a larger magnitude 2.9 mainshock in the same 20 km area, placing it within the typical aftershock window. 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 → |
On August 4, 2026, worldwide seismic activity registered a magnitude 2.0 earthquake 7 km SSE of Maria Antonia, Puerto Rico at 23:04 UTC. It arrived roughly 23 hours after a larger magnitude 2.9 mainshock in the same 20 km area, placing it within the typical aftershock window. 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 → |
At 22:48 UTC on August 4, 2026, a magnitude 2.6 tremor occurred 66 km SSW of Pelican, Alaska. 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 51.408°, 178.507° | 54.3 km | - | - | - | ✓ Reviewed | USGS → |
At 22:28 UTC on August 4, 2026, a magnitude 2.8 tremor occurred near Rat Islands, Aleutian Islands, Alaska. 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 | 2.6ml | 33 km SW of Atka, Alaska 51.962°, -174.515° | 141.3 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.6 earthquake 33 km SW of Atka, Alaska at 22:18 UTC on August 4, 2026. The event was offshore. See the M2.6 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°, -122.939° | 4.3 km | 9 | - | - | Auto | USGS → |
A magnitude 2.6 seismic event took place 7 km ESE of Cloverdale, CA on August 4, 2026 at 21:17 UTC. 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 21:08:54 UTC | 4.4mb | 62 km NE of Kuji, Japan 40.570°, 142.301° | 43.5 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.4 event was detected 62 km NE of Kuji, Japan on August 4, 2026, with origin time 21:08 UTC. The event was offshore. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 20:54:11 UTC | 2.6md | 16 km ENE of Willows, CA 39.592°, -122.025° | 22.3 km | - | - | - | Auto | USGS → |
August 4, 2026 brought a magnitude 2.6 earthquake 16 km ENE of Willows, CA, logged at 20:54 UTC. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 20:53:18 UTC | 2.7ml | 259 km W of Adak, Alaska 51.985°, 179.595° | 198.2 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.7 event was detected 259 km W of Adak, Alaska on August 4, 2026, with origin time 20:53 UTC. The event was offshore. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 20:30:04 UTC | 4.7mb | Fiji region -21.795°, -179.356° | 603.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 4, 2026, worldwide seismic activity registered a magnitude 4.7 earthquake in the Fiji region at 20:30 UTC. This is the deepest earthquake in the current dataset — a deep-focus event. 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 | 2.9ml | 92 km SSE of Atka, Alaska 51.456°, -173.581° | 3.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.9 seismic event took place 92 km SSE of Atka, Alaska on August 4, 2026 at 20:22 UTC. It arrived roughly 5 hours after a larger magnitude 4.3 mainshock in the same 20 km area, placing it within the typical aftershock window. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 20:16:37 UTC | 5.7mww | 127 km NW of Ternate, Indonesia 1.507°, 126.486° | 35.0 km | 3 | IV | green | ✓ Reviewed | USGS → |
On August 4, 2026 at 20:16 UTC, a magnitude 5.7 earthquake struck 127 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 19:56:58 UTC | 4.8mww | 43 km ESE of Koseda, Japan 30.208°, 131.047° | 45.0 km | 1 | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.8 earthquake 43 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 19:55:25 UTC | 2.8md | 6 km NE of San Simeon, CA 35.682°, -121.136° | 6.9 km | 4 | - | - | Auto | USGS → |
The USGS recorded this magnitude 2.8 earthquake 6 km NE of San Simeon, CA at 19:55 UTC on August 4, 2026. 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 → |
On August 4, 2026 at 19:13 UTC, a magnitude 2.1 earthquake struck 28 km SSE of Akutan, Alaska. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 18:04:15 UTC | 2.3md | 2 km ENE of Aromas, CA 36.897°, -121.620° | 0.8 km | - | - | - | Auto | USGS → |
A magnitude 2.3 seismic event took place 2 km ENE of Aromas, CA on August 4, 2026 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 M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 17:43:40 UTC | 2.0md | 9 km NNW of Redwood Valley, CA 39.346°, -123.231° | 5.3 km | - | - | - | Auto | USGS → |
The USGS recorded this magnitude 2.0 earthquake 9 km NNW of Redwood Valley, CA at 17:43 UTC on August 4, 2026. See the M2.0 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 → |
This magnitude 2.0 event was detected 22 km WSW of Petersville, Alaska on August 4, 2026, with origin time 17:34 UTC. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 17:30:51 UTC | 4.1mb | 179 km NE of Lospalos, Timor Leste -7.602°, 128.335° | 189.2 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.1 earthquake 179 km NE of Lospalos, Timor Leste at 17:30 UTC on August 4, 2026. 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 17:23:02 UTC | 2.2ml | 91 km W of Tyonek, Alaska 61.075°, -152.841° | 164.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 4, 2026 at 17:23 UTC, a magnitude 2.2 earthquake struck 91 km W of Tyonek, Alaska. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 17:01:09 UTC | 2.1ml | 36 km WSW of Denali Park, Alaska 63.648°, -149.637° | 121.6 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.1 earthquake was recorded 36 km WSW of Denali Park, Alaska on August 4, 2026 at 17:01 UTC. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 16:45:37 UTC | 3.3ml | 181 km S of Adak, Alaska 50.242°, -176.775° | 12.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 4, 2026, worldwide seismic activity registered a magnitude 3.3 earthquake 181 km S of Adak, Alaska at 16:45 UTC. The event was offshore. See the M3.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 16:30:01 UTC | 2.2ml | 114 km N of Yakutat, Alaska 60.574°, -139.731° | 3.5 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.2 earthquake was recorded 114 km N of Yakutat, Alaska on August 4, 2026 at 16:30 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 16:16:03 UTC | 3.3ml | 233 km ESE of Attu Station, Alaska 51.963°, 176.298° | 17.0 km | - | - | - | ✓ Reviewed | USGS → |
At 16:16 UTC on August 4, 2026, a magnitude 3.3 tremor occurred 233 km ESE of Attu Station, Alaska. This event falls inside the aftershock decay of a nearby magnitude 3.8 earthquake that occurred about 12 hours earlier. See the M3.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 16:11:31 UTC | 4.1mb | south of the Fiji Islands -23.891°, -179.883° | 453.5 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.1 event was detected south of the Fiji Islands on August 4, 2026, with origin time 16:11 UTC. 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 16:00:03 UTC | 3.0ml | 244 km ESE of Chiniak, Alaska 56.679°, -148.633° | 17.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 4, 2026, worldwide seismic activity registered a magnitude 3.0 earthquake 244 km ESE of Chiniak, Alaska at 16:00 UTC. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 15:58:34 UTC | 4.4mb | 10 km NNE of Xunchang, China 28.539°, 104.761° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.4 earthquake 10 km NNE of Xunchang, China came in on August 4, 2026 at 15:58 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2026-08-04 2026-08-04 15:53:49 UTC | 2.2ml | 24 km NNE of Cooper Landing, Alaska 60.701°, -149.722° | 27.7 km | 1 | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.2 earthquake 24 km NNE of Cooper Landing, Alaska with origin time 15:53 UTC on August 4, 2026. 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 August 4, 2026. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.