Washington earthquakes

M4.0 earthquake 16 km ENE of Packwood, Washington

A magnitude 4.0 earthquake struck 16 km ENE of Packwood, Washington on Mon, Aug 16, 2004, 2:05 PM PDT (21:05 UTC), -1 km (-1 mi) below the surface.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 4.0 (Md, duration), light
Magnitude from: Pacific Northwest Seismic Network
Local time: Mon, Aug 16, 2004, 2:05 PM PDT
UTC: 2004-08-16 21:05:53 UTC
Depth: -1.1 km (-0.7 mi), shallow
Epicenter: 46.673° N, 121.473° W
Region: Washington
Felt reports: 116
Strongest shaking: IV, light shaking
PAGER alert: Green
Tsunami flag: No
Status: Reviewed by a seismologist

Magnitude estimates

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
4.01	Md, duration	Pacific Northwest Seismic Network	Preferred · Final · ±0.05 · 12 stations
4.0	Md, duration	USGS National Earthquake Information Center	Reviewed

What happened

The USGS’s account of the effects of this earthquake.

Felt (V) at Packwood, (IV) at Naches, (III) at Randle and (II) at Buckley, Olympia and Seattle.

From the USGS event page for uw10611773. U.S. Geological Survey text and figures are in the public domain.

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated: IV, light shaking
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

116 people reported to the USGS what they felt; the strongest reported shaking was V, moderate shaking.

Estimated impact

The USGS PAGER system estimates deaths and economic losses from the shaking and the population and buildings exposed to it.

Alert level: Green: little or no damage or loss of life expected

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting: Oblique reverse
Nodal plane 1: Strike 320°, dip 73°, rake 148°
Nodal plane 2: Strike 60°, dip 60°, rake 20°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 0.8 km horizontally, 3.3 km in depth
Magnitude uncertainty: ±0.05
Depth from: Operator assigned
Station coverage gap: 37°
Stations used: 99

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 180 in the 60 days after this one and 7 in the 30 days before it.

After

The first 60 of 180.

Before

Earthquakes today Washington earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10611773 (also filed as usp000d29v, uw08162105). Read Fri, Oct 2, 2026, 6:30 AM UTC.