Earthquakes on August 29, 2021
387
EARTHQUAKES on August 29, 2021
24-hour UTC period · USGS data
LARGEST: M5.5 — South Sandwich Islands region
10 km deep
Elevated activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
6
M4.0–4.9
38
M3.0–3.9
6
M2.0–2.9
72
M1.0–1.9
265
Activity Summary
387
Total earthquakes
~250
Daily average
Elevated
Activity level
6
M5.0+ events
Geographic Breakdown
By US State
Significant Earthquakes (M4.5+)
5.5
South Sandwich Islands region
23:32 UTC · 10.0 km deep
5.3
southwest of Africa
04:01 UTC · 10.0 km deep
Felt by 1
5.2
99 km E of Neiafu, Tonga
08:50 UTC · 10.0 km deep
Felt by 1
5.1
South Sandwich Islands region
23:43 UTC · 10.0 km deep
5.0
1 km NNW of Dehesa, Mexico
19:29 UTC · 121.5 km deep
Felt by 7
5.0
South Sandwich Islands region
14:53 UTC · 25.3 km deep
4.9
northern Mid-Atlantic Ridge
16:55 UTC · 10.0 km deep
4.9
South Sandwich Islands region
13:04 UTC · 41.5 km deep
Earthquake Map — August 29, 2021
All Earthquakes — August 29, 2021
Showing 30 of 122 (filtered from 387)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2021-08-29 2021-08-29 23:53:33 UTC | 2.7ml | 7 km ENE of Renfrow, Oklahoma 36.940°, -97.570° | 6.8 km | 5 | - | - | ✓ Reviewed | USGS → |
August 29, 2021 brought a magnitude 2.7 earthquake 7 km ENE of Renfrow, Oklahoma, logged at 23:53 UTC. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-29 2021-08-29 23:43:30 UTC | 5.1mb | South Sandwich Islands region -59.243°, -23.668° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 29, 2021, worldwide seismic activity registered a magnitude 5.1 earthquake in the South Sandwich Islands region at 23:43 UTC. See the M5.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-29 2021-08-29 23:32:44 UTC | 5.5mww | South Sandwich Islands region -58.103°, -23.520° | 10.0 km | - | II | green | ✓ Reviewed | USGS → |
On August 29, 2021 at 23:32 UTC, a magnitude 5.5 earthquake struck in the South Sandwich Islands region. 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 29, 2021. See the M5.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-29 2021-08-29 23:16:50 UTC | 4.7mb | South Sandwich Islands region -59.340°, -25.168° | 14.9 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.7 seismic event took place in the South Sandwich Islands region on August 29, 2021 at 23:16 UTC. See the M4.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-29 2021-08-29 23:08:39 UTC | 4.1mb | 74 km WSW of Aitape, Papua New Guinea -3.427°, 141.739° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 29, 2021 at 23:08 UTC, a magnitude 4.1 earthquake struck 74 km WSW of Aitape, Papua New Guinea. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-29 2021-08-29 22:56:10 UTC | 4.2mb | 101 km SW of Puerto Madero, Mexico 14.138°, -93.145° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.2 earthquake 101 km SW of Puerto Madero, Mexico at 22:56 UTC on August 29, 2021. The event was offshore. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-29 2021-08-29 22:39:29 UTC | 2.5ml | 56 km S of Whites City, New Mexico 31.665°, -104.399° | 7.1 km | - | - | - | ✓ Reviewed | USGS → |
August 29, 2021 brought a magnitude 2.5 earthquake 56 km S of Whites City, New Mexico, logged at 22:39 UTC. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-29 2021-08-29 22:35:03 UTC | 2.2ml | 9 km N of Hamilton, Washington 48.610°, -121.969° | 2.8 km | 3 | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.2 earthquake 9 km N of Hamilton, Washington at 22:35 UTC on August 29, 2021. 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. | ||||||||
2021-08-29 2021-08-29 22:26:54 UTC | 4.3mb | South Sandwich Islands region -57.450°, -24.868° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 29, 2021 at 22:26 UTC, a magnitude 4.3 earthquake struck in the South Sandwich Islands region. It arrived roughly 1 hours after a larger magnitude 4.6 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-29 2021-08-29 22:11:42 UTC | 4.6mb | South Sandwich Islands region -57.483°, -24.943° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.6 earthquake in the South Sandwich Islands region at 22:11 UTC on August 29, 2021. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-29 2021-08-29 22:08:02 UTC | 4.7mb | 21 km NNW of Yigo Village, Guam 13.720°, 144.830° | 69.5 km | - | - | - | ✓ Reviewed | USGS → |
August 29, 2021 brought a magnitude 4.7 earthquake 21 km NNW of Yigo Village, Guam, logged at 22:08 UTC. See the M4.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-29 2021-08-29 21:59:53 UTC | 4.6mb | South Sandwich Islands region -59.745°, -25.967° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.6 event was detected in the South Sandwich Islands region on August 29, 2021, with origin time 21:59 UTC. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-29 2021-08-29 21:28:29 UTC | 2.0ml | 78 km WNW of Tyonek, Alaska 61.300°, -152.512° | 6.9 km | - | - | - | ✓ Reviewed | USGS → |
On August 29, 2021 at 21:28 UTC, a magnitude 2.0 earthquake struck 78 km WNW of Tyonek, Alaska. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-29 2021-08-29 21:27:28 UTC | 4.6mb | 139 km NNE of San Pedro de Atacama, Chile -21.748°, -67.684° | 216.4 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.6 earthquake 139 km NNE of San Pedro de Atacama, Chile came in on August 29, 2021 at 21:27 UTC. This is the deepest earthquake in the current dataset — an intermediate depth event. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-29 2021-08-29 21:21:09 UTC | 2.0ml | 11 km S of Princeton, Canada 49.358°, -120.483° | -0.4 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.0 earthquake was recorded 11 km S of Princeton, Canada on August 29, 2021 at 21:21 UTC. 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. | ||||||||
2021-08-29 2021-08-29 21:07:45 UTC | 4.2mb | 8 km SW of Páros, Greece 37.027°, 25.091° | 172.6 km | 1 | - | - | ✓ Reviewed | USGS → |
This magnitude 4.2 event was detected 8 km SW of Páros, Greece on August 29, 2021, with origin time 21:07 UTC. The event was offshore. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-29 2021-08-29 20:26:57 UTC | 2.6ml | 56 km ESE of Sand Point, Alaska 55.094°, -159.717° | 16.6 km | - | - | - | ✓ Reviewed | USGS → |
On August 29, 2021 at 20:26 UTC, a magnitude 2.6 earthquake struck 56 km ESE of Sand Point, Alaska. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-29 2021-08-29 20:08:18 UTC | 4.7mb | 276 km SSW of Severo-Kuril’sk, Russia 48.433°, 154.469° | 56.5 km | - | - | - | ✓ Reviewed | USGS → |
On August 29, 2021 at 20:08 UTC, a magnitude 4.7 earthquake struck 276 km SSW of Severo-Kuril’sk, Russia. See the M4.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-29 2021-08-29 20:06:32 UTC | 2.5ml | 16 km SE of Skwentna, Alaska 61.896°, -151.163° | 72.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 29, 2021 at 20:06 UTC, a magnitude 2.5 earthquake struck 16 km SE of Skwentna, Alaska. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-29 2021-08-29 19:57:02 UTC | 2.2md | 3km WNW of Cobb, CA 38.829°, -122.760° | -0.1 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.2 earthquake was recorded 3km WNW of Cobb, CA on August 29, 2021 at 19:57 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.7 earthquake that occurred about 1 hours earlier. 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. | ||||||||
2021-08-29 2021-08-29 19:56:35 UTC | 2.7md | 3km WNW of Cobb, CA 38.830°, -122.758° | 0.3 km | 6 | - | - | ✓ Reviewed | USGS → |
At 19:56 UTC on August 29, 2021, a magnitude 2.7 tremor occurred 3km WNW of Cobb, CA. In the 72 hours after this event, the USGS recorded 10 smaller earthquakes within 20 km, consistent with an ongoing aftershock sequence rooted here. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-29 2021-08-29 19:32:29 UTC | 2.1ml | 73 km ESE of Sand Point, Alaska 55.058°, -159.460° | 6.6 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.1 earthquake 73 km ESE of Sand Point, Alaska came in on August 29, 2021 at 19:32 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.1 earthquake that occurred about 2 hours earlier. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-29 2021-08-29 19:29:25 UTC | 5.0mww | 1 km NNW of Dehesa, Mexico 17.954°, -95.004° | 121.5 km | 7 | - | - | ✓ Reviewed | USGS → |
At 19:29 UTC on August 29, 2021, a magnitude 5.0 tremor occurred 1 km NNW of Dehesa, Mexico. See the M5.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-29 2021-08-29 19:10:39 UTC | 3.1ml | 59 km NE of Yakutat, Alaska 59.883°, -138.897° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 3.1 earthquake 59 km NE of Yakutat, Alaska came in on August 29, 2021 at 19:10 UTC. The event was offshore. See the M3.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-29 2021-08-29 19:09:32 UTC | 2.1ml | 110 km ESE of Yakutat, Alaska 59.069°, -138.029° | 7.5 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.1 seismic event took place 110 km ESE of Yakutat, Alaska on August 29, 2021 at 19:09 UTC. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-29 2021-08-29 18:45:50 UTC | 2.2ml | 187 km SSW of Atka, Alaska 50.555°, -174.831° | 23.6 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.2 event was detected 187 km SSW of Atka, Alaska on August 29, 2021, with origin time 18:45 UTC. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-29 2021-08-29 18:27:48 UTC | 4.5mb | South Sandwich Islands region -59.562°, -25.745° | 16.4 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.5 earthquake was recorded in the South Sandwich Islands region on August 29, 2021 at 18:27 UTC. It arrived roughly 15 hours after a larger magnitude 4.6 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-29 2021-08-29 18:22:42 UTC | 4.5mb | South Sandwich Islands region -56.978°, -25.240° | 30.2 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.5 earthquake in the South Sandwich Islands region with origin time 18:22 UTC on August 29, 2021. This event falls inside the aftershock decay of a nearby magnitude 5.0 earthquake that occurred about 3 hours earlier. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-29 2021-08-29 18:09:46 UTC | 2.3md | 10 km SW of Volcano, Hawaii 19.364°, -155.295° | 1.3 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.3 earthquake 10 km SW of Volcano, Hawaii with origin time 18:09 UTC on August 29, 2021. This event falls inside the aftershock decay of a nearby magnitude 2.6 earthquake that occurred about 5 hours earlier. 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. | ||||||||
2021-08-29 2021-08-29 17:43:24 UTC | 2.1ml | 71 km ESE of Sand Point, Alaska 55.087°, -159.465° | 7.5 km | - | - | - | ✓ Reviewed | USGS → |
August 29, 2021 brought a magnitude 2.1 earthquake 71 km ESE of Sand Point, Alaska, logged at 17:43 UTC. It arrived roughly 1 hours after a larger magnitude 3.1 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M2.1 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 August 29, 2021. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.