Minor earthquake of magnitude 0.8 to 15 km deep
28 Aug 18:20 UTC: First to report: USGS after 11 am.
I felt this tremor
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Date and time: Aug 28, 2021 07:49:08 UTC –
Local time at epicenter: Saturday August 28, 2021 12:49 am (GMT -7)
Magnitude: 0.8
Depth: 14.6 km
Latitude / longitude of epicenter: 46.1185 ° N / 122.46567 ° W↗ 
(Washington, United States)
Antipode: 46.119 ° S / 57.534 ° E↗
Nearest volcano: Mount St. Helens (24 km / 15 mi)
Nearby towns and villages:
23 km (14 mi) north of Amboy (pop: 1,610) -> See nearby earthquakes!
36 km (23 mi) east of Longview (Cowlitz County) (pop: 36,800) -> Observe the earthquakes nearby!
38 km (24 mi) north of Battlefield (Clark County) (pop: 19,400) -> Observe the earthquakes nearby!
48 km (30 mi) NNE of Salmon stream (pop: 19,700) -> Observe the earthquakes nearby!
49 km (30 mi) N of Five corners (pop: 18,200) -> See nearby earthquakes!
55 km (34 mi) NNE of Vancouver (pop: 172,900) -> See nearby earthquakes!
68 km (42 mi) NNE of Portland, Oregon) (pop: 632,300) -> See earthquakes nearby!
69 km (43 mi) north of Gresham (Oregon) (pop: 110,600) -> See nearby earthquakes!
75 km (47 mi) NNE of Beaverton (Oregon) (pop: 96,600) -> See nearby earthquakes!
78 km (48 mi) NNE of Hillsboro, Oregon (pop: 102,300) -> See nearby earthquakes!
Main data source: USGS (United States Geological Survey)
Estimated energy released: 1×106 joules (0.278 kilowatt-hours) More info
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Also if you did NOT feel the tremor even if you were in the area, please report it! Your contribution is also valuable to earthquake science and seismic risk analysis and mitigation efforts. You can use your device’s location or the map to show where you were during the earthquake. Thank you!
Data for the same earthquake reported by different agencies
Info: The more agencies report the same earthquake and publish similar data, the more confidence you can have in the data. It normally takes up to a few hours for the seismic parameters to be calculated with near optimum accuracy.
| Mag. | Depth | Site | Source |
| 0.8 | 15 km | 23 km on the north of Amboy, Washington | USGS |
User reports for this earthquake
At a magnitude of 0.8, such an earthquake would not normally be felt by people, but could be recorded instrumentally.
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Previous earthquakes in the same region
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