Earthquake · reviewed by a seismologist
M 1.9ml
22 km SSE of Packwood, Washington
Yes. A magnitude 1.9 earthquake was recorded 22 km SSE of Packwood, Washington, at 11:16 pm PDT on 6 September 2020 (06:16 UTC), less than 1 km deep.
- When
- Magnitude
- M 1.9 (ml)
- Depth
- 0.1 km below the surface
- Felt
- no reports yet
- Nearest
- Skamania County, 52 km SW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2257 days ago
Earthquake alerts for Morton, WA
Get a notification in this browser when USGS records an earthquake near Morton, WA. No account or email needed.
Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth, people at rest would likely notice it out to about 14 km (9 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.
How big was it?
This earthquake released about 18 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 840,000× the energy of this one
- Magna, Utah 2020 M 5.7 600,000× the energy of this one
- Around the size people start to feel M 3.0 53× the energy of this one
- This earthquake M 1.9 about 18 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 lists 2 earthquakes of M5 or more within 50 km:
- 5.0 34 km SSE of Morton, Washington · 49 km WSW of this epicentre
- 5.0 23 km ESE of Packwood, Washington · 19 km NE of this epicentre
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 46.4133, -121.5785. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Skamania County, WA | 52 km (32 mi) | SW | earthquakes near Skamania County |
| Lewis County, WA | 64 km (40 mi) | WNW | earthquakes near Lewis County |
| Yakima County, WA | 64 km (40 mi) | E | earthquakes near Yakima County |
| Pierce County, WA | 83 km (52 mi) | NNW | earthquakes near Pierce County |
| Klickitat County, WA | 86 km (54 mi) | SE | earthquakes near Klickitat County |
| Cowlitz County, WA | 88 km (55 mi) | WSW | earthquakes near Cowlitz County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
23 earthquakes have been recorded within 50 km since this one.
- 1.7 36 km SSE of Morton, Washington
- 1.8 5 km ENE of Ashford, Washington
- 2.7 5 km ENE of Ashford, Washington
- 2.1 5 km ENE of Ashford, Washington
- 2.2 36 km SSE of Morton, Washington
- 1.7 32 km ESE of Packwood, Washington
- 2.5 15 km SSE of Ashford, Washington
- 1.6 22 km ENE of Ashford, Washington
- 2.4 17 km SW of Nile, Washington
- 2.1 7 km W of Packwood, Washington
- 2.9 7 km W of Packwood, Washington
- 1.6 5 km SW of Packwood, Washington
- 1.7 17 km NNE of Packwood, Washington
- 2.0 5 km WNW of Packwood, Washington
- 1.7 7 km ESE of Ashford, 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.