Earthquakes on August 8, 2021
270
EARTHQUAKES on August 8, 2021
24-hour UTC period · USGS data
LARGEST: M5.5 — Macquarie Island region
10 km deep
Normal activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
3
M4.0–4.9
34
M3.0–3.9
14
M2.0–2.9
73
M1.0–1.9
146
Activity Summary
270
Total earthquakes
~250
Daily average
Normal
Activity level
3
M5.0+ events
Geographic Breakdown
By US State
Significant Earthquakes (M4.5+)
5.5
Macquarie Island region
22:19 UTC · 10.0 km deep
5.2
226 km SE of Attu Station, Alaska
14:50 UTC · 21.3 km deep
5.1
Galapagos Triple Junction region
00:49 UTC · 10.0 km deep
4.9
53 km NE of Hihifo, Tonga
23:41 UTC · 78.0 km deep
4.9
southern Mid-Atlantic Ridge
23:03 UTC · 10.0 km deep
4.8
181 km SE of Lata, Solomon Islands
14:51 UTC · 113.0 km deep
4.8
74 km WNW of Isangel, Vanuatu
14:37 UTC · 45.3 km deep
4.7
southeast of the Loyalty Islands
16:50 UTC · 10.0 km deep
Earthquake Map — August 8, 2021
All Earthquakes — August 8, 2021
Showing 30 of 124 (filtered from 270)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2021-08-08 2021-08-08 23:52:56 UTC | 2.5ml | 79 km NW of Yakutat, Alaska 60.014°, -140.787° | 2.5 km | - | - | - | ✓ Reviewed | USGS → |
August 8, 2021 brought a magnitude 2.5 earthquake 79 km NW of Yakutat, Alaska, logged at 23:52 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-08 2021-08-08 23:49:21 UTC | 2.7ml | 37 km SE of Mina, Nevada 38.183°, -117.776° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 8, 2021 at 23:49 UTC, a magnitude 2.7 earthquake struck 37 km SE of Mina, Nevada. The event was offshore. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-08 2021-08-08 23:41:19 UTC | 4.9mb | 53 km NE of Hihifo, Tonga -15.585°, -173.470° | 78.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 8, 2021, worldwide seismic activity registered a magnitude 4.9 earthquake 53 km NE of Hihifo, Tonga at 23:41 UTC. The event was offshore. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-08 2021-08-08 23:24:35 UTC | 4.1mb | 3 km S of Quillota, Chile -32.912°, -71.253° | 53.5 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.1 earthquake was recorded 3 km S of Quillota, Chile on August 8, 2021 at 23:24 UTC. The event was offshore. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-08 2021-08-08 23:04:11 UTC | 2.6ml | 41 km SSE of Perryville, Alaska 55.548°, -158.982° | 48.5 km | - | - | - | ✓ Reviewed | USGS → |
At 23:04 UTC on August 8, 2021, a magnitude 2.6 tremor occurred 41 km SSE of Perryville, Alaska. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-08 2021-08-08 23:03:37 UTC | 4.9mb | southern Mid-Atlantic Ridge -56.707°, -6.028° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
At 23:03 UTC on August 8, 2021, a magnitude 4.9 tremor occurred near southern Mid-Atlantic Ridge. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-08 2021-08-08 22:54:14 UTC | 4.5mb | 116 km SE of Kuqa, China 40.926°, 83.840° | 8.1 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.5 earthquake 116 km SE of Kuqa, China at 22:54 UTC on August 8, 2021. The event was offshore. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-08 2021-08-08 22:49:53 UTC | 2.5ml | 6 km SW of Volcano, Hawaii 19.407°, -155.285° | 1.0 km | - | - | - | ✓ Reviewed | USGS → |
At 22:49 UTC on August 8, 2021, a magnitude 2.5 tremor occurred 6 km SW of Volcano, Hawaii. Coming 11 hours after a magnitude 2.6 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-08 2021-08-08 22:19:11 UTC | 5.5mww | Macquarie Island region -59.786°, 159.546° | 10.0 km | - | - | green | ✓ Reviewed | USGS → |
On August 8, 2021 at 22:19 UTC, a magnitude 5.5 earthquake struck in the Macquarie Island 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 8, 2021. See the M5.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-08 2021-08-08 22:07:34 UTC | 2.2ml | 58 km S of Whites City, New Mexico 31.653°, -104.320° | 7.4 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.2 earthquake was recorded 58 km S of Whites City, New Mexico on August 8, 2021 at 22:07 UTC. Coming 18 hours after a magnitude 3.5 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-08 2021-08-08 21:50:55 UTC | 4.5mb | 190 km N of Sola, Vanuatu -12.163°, 167.402° | 240.7 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.5 event was detected 190 km N of Sola, Vanuatu on August 8, 2021, with origin time 21:50 UTC. The event was offshore. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-08 2021-08-08 21:38:31 UTC | 4.5mb | 296 km E of Levuka, Fiji -17.567°, -177.939° | 597.3 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.5 earthquake 296 km E of Levuka, Fiji came in on August 8, 2021 at 21:38 UTC. This is the deepest earthquake in the current dataset — a deep-focus event. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-08 2021-08-08 21:35:24 UTC | 2.9md | 2 km SW of Indios, Puerto Rico 17.981°, -66.836° | 15.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.9 earthquake 2 km SW of Indios, Puerto Rico at 21:35 UTC on August 8, 2021. The event was offshore. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-08 2021-08-08 21:16:57 UTC | 2.5ml | 96 km SE of Akutan, Alaska 53.465°, -164.837° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 8, 2021 at 21:16 UTC, a magnitude 2.5 earthquake struck 96 km SE of Akutan, Alaska. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-08 2021-08-08 21:10:23 UTC | 4.0mb | 8 km SSE of Laktaši, Bosnia and Herzegovina 44.835°, 17.349° | 9.1 km | 11 | - | - | ✓ Reviewed | USGS → |
At 21:10 UTC on August 8, 2021, a magnitude 4.0 tremor occurred 8 km SSE of Laktaši, Bosnia and Herzegovina. See the M4.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-08 2021-08-08 20:41:41 UTC | 4.0ml | 160 km SE of Chignik, Alaska 55.458°, -156.310° | 28.8 km | - | I | green | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.0 earthquake 160 km SE of Chignik, Alaska at 20:41 UTC on August 8, 2021. The USGS PAGER system assigned a green alert level for this event, signalling no significant casualties or damage expected. The event was offshore. See the M4.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-08 2021-08-08 20:31:23 UTC | 2.1md | 15km ENE of Alum Rock, CA 37.426°, -121.672° | 4.5 km | 3 | - | - | ✓ Reviewed | USGS → |
This magnitude 2.1 event was detected 15km ENE of Alum Rock, CA on August 8, 2021, with origin time 20:31 UTC. 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. | ||||||||
2021-08-08 2021-08-08 20:21:58 UTC | 2.4md | 11km W of Alder Springs, CA 39.660°, -122.857° | -0.3 km | - | - | - | ✓ Reviewed | USGS → |
August 8, 2021 brought a magnitude 2.4 earthquake 11km W of Alder Springs, CA, logged at 20:21 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.4 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 M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-08 2021-08-08 20:12:18 UTC | 2.2ml | 7 km E of P?hala, Hawaii 19.210°, -155.405° | 33.0 km | - | - | - | Auto | USGS → |
The USGS recorded this magnitude 2.2 earthquake 7 km E of P?hala, Hawaii at 20:12 UTC on August 8, 2021. Coming 4 hours after a magnitude 3.0 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-08 2021-08-08 20:11:53 UTC | 2.2ml | 6 km ENE of P?hala, Hawaii 19.237°, -155.423° | 31.8 km | - | - | - | Auto | USGS → |
A magnitude 2.2 seismic event took place 6 km ENE of P?hala, Hawaii on August 8, 2021 at 20:11 UTC. Coming 4 hours after a magnitude 3.0 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. | ||||||||
2021-08-08 2021-08-08 20:02:44 UTC | 3.1ml | 16 km ENE of Wright, Wyoming 43.811°, -105.299° | 0.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 3.1 event was detected 16 km ENE of Wright, Wyoming on August 8, 2021, with origin time 20:02 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. | ||||||||
2021-08-08 2021-08-08 19:55:18 UTC | 3.9ml | 163 km E of Saint Augustine Beach, Florida 30.146°, -79.607° | 0.0 km | 2 | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 3.9 earthquake 163 km E of Saint Augustine Beach, Florida came in on August 8, 2021 at 19:55 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M3.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-08 2021-08-08 19:52:18 UTC | 2.3md | 4 km S of P?hala, Hawaii 19.162°, -155.478° | 37.8 km | - | - | - | Auto | USGS → |
On August 8, 2021 at 19:52 UTC, a magnitude 2.3 earthquake struck 4 km S of P?hala, Hawaii. It arrived roughly 4 hours after a larger magnitude 3.0 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-08 2021-08-08 19:50:55 UTC | 4.6mb | southeast of Easter Island -36.081°, -100.708° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.6 seismic event took place southeast of Easter Island on August 8, 2021 at 19:50 UTC. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-08 2021-08-08 19:48:26 UTC | 2.4md | 11km W of Alder Springs, CA 39.662°, -122.858° | 6.9 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.4 event was detected 11km W of Alder Springs, CA on August 8, 2021, with origin time 19:48 UTC. The event was offshore. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-08 2021-08-08 19:15:47 UTC | 4.2mb | 5 km ENE of Asímion, Greece 35.055°, 25.149° | 10.0 km | 3 | - | - | ✓ Reviewed | USGS → |
August 8, 2021 brought a magnitude 4.2 earthquake 5 km ENE of Asímion, Greece, logged at 19:15 UTC. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-08 2021-08-08 18:51:06 UTC | 2.2md | 2 km SSE of P?hala, Hawaii 19.179°, -155.468° | 34.2 km | - | - | - | Auto | USGS → |
The USGS recorded this magnitude 2.2 earthquake 2 km SSE of P?hala, Hawaii at 18:51 UTC on August 8, 2021. It arrived roughly 3 hours after a larger magnitude 3.0 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. | ||||||||
2021-08-08 2021-08-08 18:50:08 UTC | 2.0ml | 126 km NW of Yakutat, Alaska 60.352°, -141.330° | 13.5 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.0 seismic event took place 126 km NW of Yakutat, Alaska on August 8, 2021 at 18:50 UTC. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-08 2021-08-08 18:44:53 UTC | 4.5mb | Kermadec Islands, New Zealand -29.837°, -177.710° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.5 seismic event took place near Kermadec Islands, New Zealand on August 8, 2021 at 18:44 UTC. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-08 2021-08-08 18:14:03 UTC | 2.8ml | 9 km E of P?hala, Hawaii 19.206°, -155.389° | 31.8 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.8 seismic event took place 9 km E of P?hala, Hawaii on August 8, 2021 at 18:14 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.0 earthquake that occurred about 2 hours earlier. The event was offshore. See the M2.8 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 8, 2021. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.