Earthquakes on August 19, 2021
385
EARTHQUAKES on August 19, 2021
24-hour UTC period · USGS data
LARGEST: M5.3 — South Sandwich Islands region
50 km deep
Elevated activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
10
M4.0–4.9
47
M3.0–3.9
14
M2.0–2.9
78
M1.0–1.9
236
Activity Summary
385
Total earthquakes
~250
Daily average
Elevated
Activity level
10
M5.0+ events
Significant Earthquakes (M4.5+)
5.3
South Sandwich Islands region
08:28 UTC · 49.6 km deep
5.2
south of the Kermadec Islands
17:53 UTC · 10.0 km deep
5.2
South Sandwich Islands region
16:27 UTC · 47.1 km deep
5.2
Kuril Islands
05:29 UTC · 10.0 km deep
5.1
South Sandwich Islands region
21:26 UTC · 10.0 km deep
5.1
161 km SE of Pangai, Tonga
11:48 UTC · 10.0 km deep
5.1
South Sandwich Islands region
10:23 UTC · 30.9 km deep
5.1
South Sandwich Islands region
05:23 UTC · 27.4 km deep
Earthquake Map — August 19, 2021
All Earthquakes — August 19, 2021
Showing 30 of 149 (filtered from 385)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2021-08-19 2021-08-19 23:54:11 UTC | 2.7ml | 228 km SE of Attu Station, Alaska 51.577°, 175.812° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
At 23:54 UTC on August 19, 2021, a magnitude 2.7 tremor occurred 228 km SE of Attu Station, Alaska. The event was offshore. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-19 2021-08-19 23:52:30 UTC | 2.3ml | 7 km E of P?hala, Hawaii 19.215°, -155.405° | 30.9 km | - | - | - | Auto | USGS → |
On August 19, 2021, worldwide seismic activity registered a magnitude 2.3 earthquake 7 km E of P?hala, Hawaii at 23:52 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.9 earthquake that occurred about 9 hours earlier. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-19 2021-08-19 23:51:12 UTC | 2.8ml | 29 km NNE of Atka, Alaska 52.446°, -174.065° | 217.3 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.8 seismic event took place 29 km NNE of Atka, Alaska on August 19, 2021 at 23:51 UTC. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-19 2021-08-19 23:48:39 UTC | 2.1ml | 1 km ESE of P?hala, Hawaii 19.198°, -155.461° | 35.1 km | - | - | - | Auto | USGS → |
This magnitude 2.1 event was detected 1 km ESE of P?hala, Hawaii on August 19, 2021, with origin time 23:48 UTC. It arrived roughly 9 hours after a larger magnitude 2.9 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. | ||||||||
2021-08-19 2021-08-19 23:33:17 UTC | 2.5md | 8km W of Petrolia, CA 40.335°, -124.374° | 27.6 km | - | - | - | ✓ Reviewed | USGS → |
On August 19, 2021, worldwide seismic activity registered a magnitude 2.5 earthquake 8km W of Petrolia, CA at 23:33 UTC. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-19 2021-08-19 23:30:13 UTC | 4.3mb | 70 km ENE of Mutsu, Japan 41.484°, 142.022° | 57.5 km | - | - | - | ✓ Reviewed | USGS → |
At 23:30 UTC on August 19, 2021, a magnitude 4.3 tremor occurred 70 km ENE of Mutsu, Japan. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-19 2021-08-19 23:27:00 UTC | 4.6mb | central Mid-Atlantic Ridge 0.602°, -29.098° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.6 earthquake near central Mid-Atlantic Ridge came in on August 19, 2021 at 23:27 UTC. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-19 2021-08-19 23:20:58 UTC | 3.4ml | 64 km SE of Adak, Alaska 51.470°, -175.959° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
August 19, 2021 brought a magnitude 3.4 earthquake 64 km SE of Adak, Alaska, logged at 23:20 UTC. The event was offshore. See the M3.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-19 2021-08-19 22:51:09 UTC | 2.0ml | 97 km WSW of Nikolski, Alaska 52.662°, -170.231° | 5.4 km | - | - | - | ✓ Reviewed | USGS → |
At 22:51 UTC on August 19, 2021, a magnitude 2.0 tremor occurred 97 km WSW of Nikolski, Alaska. It arrived roughly 6 hours after a larger magnitude 2.2 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. | ||||||||
2021-08-19 2021-08-19 22:49:56 UTC | 2.1md | 6 km SW of La Parguera, Puerto Rico 17.941°, -67.097° | 11.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.1 seismic event took place 6 km SW of La Parguera, Puerto Rico on August 19, 2021 at 22:49 UTC. It arrived roughly 9 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 M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-19 2021-08-19 22:42:08 UTC | 2.3ml | 79 km WNW of Tyonek, Alaska 61.292°, -152.530° | 0.9 km | - | - | - | ✓ Reviewed | USGS → |
At 22:42 UTC on August 19, 2021, a magnitude 2.3 tremor occurred 79 km WNW of Tyonek, Alaska. 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. | ||||||||
2021-08-19 2021-08-19 22:16:02 UTC | 3.2ml | 27 km E of Atka, Alaska 52.231°, -173.800° | 18.8 km | - | - | - | ✓ Reviewed | USGS → |
At 22:16 UTC on August 19, 2021, a magnitude 3.2 tremor occurred 27 km E of Atka, Alaska. The event was offshore. See the M3.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-19 2021-08-19 22:14:10 UTC | 2.8ml | 16 km SSW of McKinnon, Wyoming 40.895°, -110.034° | 0.0 km | - | - | - | ✓ Reviewed | USGS → |
August 19, 2021 brought a magnitude 2.8 earthquake 16 km SSW of McKinnon, Wyoming, logged at 22:14 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-19 2021-08-19 21:58:22 UTC | 2.1ml | 223 km SSE of Akutan, Alaska 52.295°, -164.415° | 7.8 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.1 seismic event took place 223 km SSE of Akutan, Alaska on August 19, 2021 at 21:58 UTC. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-19 2021-08-19 21:55:54 UTC | 2.4ml | 119 km ESE of Chignik, Alaska 55.710°, -156.793° | 28.3 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.4 earthquake 119 km ESE of Chignik, Alaska came in on August 19, 2021 at 21:55 UTC. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-19 2021-08-19 21:26:32 UTC | 5.1mb | South Sandwich Islands region -58.478°, -23.457° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
At 21:26 UTC on August 19, 2021, a magnitude 5.1 tremor occurred in the South Sandwich Islands region. See the M5.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-19 2021-08-19 21:19:38 UTC | 2.2ml | 1 km S of Quinton, Oklahoma 35.105°, -95.373° | 6.2 km | 1 | - | - | ✓ Reviewed | USGS → |
A magnitude 2.2 earthquake was recorded 1 km S of Quinton, Oklahoma on August 19, 2021 at 21:19 UTC. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-19 2021-08-19 20:50:35 UTC | 2.0md | 5 km E of P?hala, Hawaii 19.210°, -155.431° | 34.5 km | - | - | - | Auto | USGS → |
On August 19, 2021 at 20:50 UTC, a magnitude 2.0 earthquake struck 5 km E of P?hala, Hawaii. Coming 6 hours after a magnitude 2.9 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-19 2021-08-19 20:45:33 UTC | 5.0mb | 113 km SSE of ‘Ohonua, Tonga -22.310°, -174.616° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 5.0 seismic event took place 113 km SSE of ‘Ohonua, Tonga on August 19, 2021 at 20:45 UTC. See the M5.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-19 2021-08-19 20:44:15 UTC | 3.5md | 25 km NNE of Charlotte Amalie, U.S. Virgin Islands 18.558°, -64.859° | 15.0 km | 4 | - | - | ✓ Reviewed | USGS → |
A magnitude 3.5 seismic event took place 25 km NNE of Charlotte Amalie, U.S. Virgin Islands on August 19, 2021 at 20:44 UTC. See the M3.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-19 2021-08-19 20:40:41 UTC | 2.2ml | 2 km ESE of P?hala, Hawaii 19.197°, -155.455° | 37.2 km | - | - | - | Auto | USGS → |
At 20:40 UTC on August 19, 2021, a magnitude 2.2 tremor occurred 2 km ESE of P?hala, Hawaii. This event falls inside the aftershock decay of a nearby magnitude 2.9 earthquake that occurred about 6 hours earlier. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-19 2021-08-19 20:21:15 UTC | 4.3mb | 138 km SSW of Hihifo, Tonga -17.134°, -174.239° | 109.7 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.3 earthquake 138 km SSW of Hihifo, Tonga at 20:21 UTC on August 19, 2021. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-19 2021-08-19 20:16:34 UTC | 2.9ml | 113 km WSW of Adak, Alaska 51.499°, -178.159° | 66.1 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.9 earthquake 113 km WSW of Adak, Alaska with origin time 20:16 UTC on August 19, 2021. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-19 2021-08-19 20:13:10 UTC | 4.3mb | South Sandwich Islands region -55.549°, -28.151° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.3 event was detected in the South Sandwich Islands region on August 19, 2021, with origin time 20:13 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-19 2021-08-19 20:07:40 UTC | 4.1mb | 53 km SSE of Pelabuhanratu, Indonesia -7.396°, 106.803° | 119.9 km | - | - | - | ✓ Reviewed | USGS → |
At 20:07 UTC on August 19, 2021, a magnitude 4.1 tremor occurred 53 km SSE of Pelabuhanratu, Indonesia. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-19 2021-08-19 20:03:42 UTC | 2.2md | 7 km SW of La Parguera, Puerto Rico 17.939°, -67.103° | 11.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 19, 2021 at 20:03 UTC, a magnitude 2.2 earthquake struck 7 km SW of La Parguera, Puerto Rico. Coming 6 hours after a magnitude 3.3 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. | ||||||||
2021-08-19 2021-08-19 19:51:47 UTC | 2.7ml | 39 km NW of Ninilchik, Alaska 60.324°, -152.120° | 75.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.7 earthquake 39 km NW of Ninilchik, Alaska at 19:51 UTC on August 19, 2021. The event was offshore. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-19 2021-08-19 19:40:42 UTC | 4.3mb | 84 km WSW of Masachapa, Nicaragua 11.605°, -87.266° | 33.6 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.3 earthquake 84 km WSW of Masachapa, Nicaragua came in on August 19, 2021 at 19:40 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-19 2021-08-19 19:31:03 UTC | 3.0ml | 95 km SSE of Sand Point, Alaska 54.592°, -159.754° | 22.8 km | - | - | - | ✓ Reviewed | USGS → |
August 19, 2021 brought a magnitude 3.0 earthquake 95 km SSE of Sand Point, Alaska, logged at 19:31 UTC. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-08-19 2021-08-19 19:20:50 UTC | 2.6ml | 16 km SW of Valdez, Alaska 61.035°, -146.574° | 11.1 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.6 seismic event took place 16 km SW of Valdez, Alaska on August 19, 2021 at 19:20 UTC. The event was offshore. See the M2.6 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 19, 2021. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.