Earthquake · reviewed by a seismologist
M 1.8ml
Earthquake near Sunnyslope, WA
USGS: 11 km N of Sunnyslope, Washington
- When
- 1:06 am PDT on 17 August 2017 ()
- Where
- 11 km (7 mi) N of Sunnyslope, WA · earthquakes near Sunnyslope
- Magnitude
- M 1.8 (ml)
- Depth
- 5.5 km below the surface
- Felt
- no reports yet
- Nearest
- Chelan County, 39 km NW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3333 days ago
A magnitude 1.8 earthquake was recorded 11 km (7 mi) N of Sunnyslope, WA, at 1:06 am PDT on 17 August 2017 (08:06 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
Earthquakes near other towns within 30 km: Cashmere, Entiat, West Wenatchee, Wenatchee, East Wenatchee Bench, East Wenatchee.
How big was it?
This earthquake released about 14 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
- Magna, Utah 2020 M 5.7 790,000× the energy of this one
- Around the size people start to feel M 3.0 70× the energy of this one
- This earthquake M 1.8 about 14 lb of TNT
Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.
For this area
No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.
Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.
Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.
Where
Epicentre 47.5748, -120.3222. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Chelan County, WA | 39 km (24 mi) | NW | earthquakes near Chelan County |
| Douglas County, WA | 51 km (31 mi) | ENE | earthquakes near Douglas County |
| Kittitas County, WA | 57 km (35 mi) | SSW | earthquakes near Kittitas County |
| Grant County, WA | 76 km (47 mi) | ESE | earthquakes near Grant County |
| King County, WA | 114 km (71 mi) | W | earthquakes near King County |
| Okanogan County, WA | 117 km (72 mi) | NNE | earthquakes near Okanogan County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
57 earthquakes have been recorded within 50 km since this one.
- 1.7 8 km W of Entiat, Washington
- 1.6 6 km WNW of Entiat, Washington
- 1.5 7 km N of Waterville, Washington
- 2.0 12 km WSW of Entiat, Washington
- 1.8 10 km NNE of Entiat, Washington
- 1.5 5 km S of Entiat, Washington
- 1.8 13 km WNW of Granite Falls, Washington
- 1.5 6 km W of Entiat, Washington
- 2.1 9 km WNW of Entiat, Washington
- 1.8 11 km SSW of Cashmere, Washington
- 2.0 18 km W of Entiat, Washington
- 1.5 30 km NNW of Leavenworth, Washington
- 1.5 10 km WNW of Entiat, Washington
- 1.6 9 km WNW of Entiat, Washington
- 1.6 5 km SW of Chelan Falls, Washington
Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.
On USGS
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.