Earthquake · reviewed by a seismologist
M 1.9ml
Earthquake near Graham, WA
No earthquake was likely felt in Graham in the 24 hours to 7:56 am PST (15:56 UTC). The last one was M 1.6, 5 km (3 mi) SE, at 11:47 am PST on 9 November 2026, estimated intensity II (weak) in town. Every earthquake near Graham
This page: a magnitude 1.9 earthquake was recorded 46 km (29 mi) south-southwest of Graham, WA, at 2:28 am PDT on 4 April 2019 (09:28 UTC), 19 km deep.
USGS: 13 km NNE of Mossyrock, Washington
53 km (33 mi) SSE of Lacey, WA · 108 km (67 mi) S of Seattle, WA
- When
- 2:28 am PDT on 4 April 2019 ()
- Where
- 46 km (29 mi) south-southwest of Graham, WA · earthquakes near Graham
- Magnitude
- M 1.9 (ml)
- Depth
- 19 km below the surface
- Felt
- no reports yet
- Nearest
- Lewis County, 8 km SSE
- Nearest mapped fault
- Olympia structure, 24 km from its surface trace — near is not the same as on
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2780 days ago
Earthquake alerts for Graham, WA
Get a notification in this browser when USGS records an earthquake near Graham, 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 it was probably too small to be felt, even directly above it. In Graham, 46 km away, the estimate is intensity I (not felt). 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: Morton, Eatonville.
How big was it?
This earthquake released about 21 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 5.8 710,000× the energy of this one
- Magna, Utah 2020 M 5.7 500,000× the energy of this one
- Around the size people start to feel M 3.0 45× the energy of this one
- This earthquake M 1.9 about 21 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 3 earthquakes of M5 or more within 50 km:
- 6.7 4 km WNW of Roy, Washington · 43 km NNW of this epicentre
- 5.2 23 km S of Morton, Washington · 36 km SSE of this epicentre
- 5.0 34 km SSE of Morton, Washington · 47 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 46.6455, -122.4138. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Lewis County, WA | 8 km (5 mi) | SSE | earthquakes near Lewis County |
| Thurston County, WA | 45 km (28 mi) | NW | earthquakes near Thurston County |
| Pierce County, WA | 49 km (31 mi) | NNE | earthquakes near Pierce County |
| Cowlitz County, WA | 54 km (33 mi) | SSW | earthquakes near Cowlitz County |
| Skamania County, WA | 78 km (48 mi) | SSE | earthquakes near Skamania County |
| Wahkiakum County, WA | 87 km (54 mi) | WSW | earthquakes near Wahkiakum 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.
- 1.5 14 km NNE of Ashford, Washington
- 2.1 9 km NNE of Mossyrock, Washington
- 1.7 21 km E of Castle Rock, Washington
- 2.1 29 km E of Castle Rock, Washington
- 1.6 6 km NNW of Ashford, Washington
- 1.6 2 km SSE of Kapowsin, Washington
- 1.9 8 km NE of Ashford, Washington
- 1.6 21 km E of Castle Rock, Washington
- 1.6 2 km SSW of Kapowsin, Washington
- 1.9 10 km SSE of Toledo, Washington
- 1.7 20 km SE of Toledo, Washington
- 1.5 17 km NE of Ashford, Washington
- 1.6 14 km SE of Mossyrock, Washington
- 2.5 19 km NNE of Ashford, Washington
- 1.6 15 km ESE of Morton, 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.