explosion · reviewed by a seismologist
M 1.8ml
Earthquake near Kalama, WA
No earthquake was likely felt in Kalama in the 24 hours to 1:25 pm PST (21:25 UTC). The last one was M 3.0, 14 km (8 mi) S, at 7:25 am PDT on 22 October 2026, estimated intensity II (weak) in town; 113 felt reports to USGS. Every earthquake near Kalama
No: USGS classifies this as a explosion, not an earthquake. A magnitude 1.8 explosion was recorded in Kalama, WA, at 1:57 pm PDT on 13 April 2020 (20:57 UTC), less than 1 km deep.
USGS: 0 km SW of Kalama, Washington
54 km (34 mi) NNW of Portland, OR · 45 km (28 mi) NNW of Vancouver, WA
- When
- 1:57 pm PDT on 13 April 2020 ()
- Where
- in Kalama, WA · earthquakes near Kalama
- Magnitude
- M 1.8 (ml)
- Depth
- -0.4 km below the surface
- Felt
- no reports yet
- Nearest
- Columbia County, 19 km WSW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2405 days ago
Earthquake alerts for Kalama, WA
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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 13 km (8 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.
Earthquakes near other towns within 30 km: Rainier, Columbia City, Woodland, Saint Helens, Longview, Kelso.
USGS catalogues this as explosion, not an earthquake.
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 lists one earthquake of M5 or more within 50 km:
- 5.2 5 km E of Bridgeton, Oregon · 49 km SSE 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 46.0017, -122.8533. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Columbia County, OR | 19 km (12 mi) | WSW | earthquakes near Columbia County |
| Cowlitz County, WA | 26 km (16 mi) | NNE | earthquakes near Cowlitz County |
| Clark County, WA | 38 km (24 mi) | SE | earthquakes near Clark County |
| Washington County, OR | 53 km (33 mi) | SSW | earthquakes near Washington County |
| Wahkiakum County, WA | 55 km (34 mi) | NW | earthquakes near Wahkiakum County |
| Multnomah County, OR | 61 km (38 mi) | SE | earthquakes near Multnomah County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
55 earthquakes have been recorded within 50 km since this one.
- 1.5 2 km SSE of Lewisville, Washington
- 1.7 26 km N of Amboy, Washington
- 2.0 1 km NNW of Salmon Creek, Washington
- 1.6 Washington-Oregon border region
- 1.8 2 km N of West Longview, Washington
- 1.7 12 km NE of Vernonia, Oregon
- 1.5 13 km ENE of Vernonia, Oregon
- 1.7 3 km SSW of Yacolt, Washington
- 1.9 3 km NNW of West Longview, Washington
- 1.7 3 km NNE of Deer Island, Oregon
- 1.6 4 km NW of West Longview, Washington
- 1.8 1 km ENE of Prescott, Oregon
- 1.8 4 km SW of North Portland, Oregon
- 1.5 5 km ENE of Lewisville, Washington
- 1.7 21 km E of Castle Rock, 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.