Oregon earthquakes

M5.9 earthquake 22 km WNW of Klamath Falls, Oregon

A magnitude 5.9 earthquake struck 22 km WNW of Klamath Falls, Oregon on Mon, Sep 20, 1993, 8:28 PM PDT (03:28 UTC), 9 km (5 mi) below the surface.

A larger quake followed: M6.0 27 km WNW of Klamath Falls, Oregon. This one was a foreshock.

Klamath Falls forecast More in Oregon

Map

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

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The earthquake

Magnitude: 5.9 (md), moderate
Local time: Mon, Sep 20, 1993, 8:28 PM PDT
UTC: 1993-09-21 03:28:55 UTC
Depth: 8.6 km (5.3 mi), shallow
Epicenter: 42.316° N, 122.027° W
Region: Oregon
Strongest shaking: VI, strong shaking
Tsunami flag: No
Status: Reviewed by a seismologist

Shaking

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

Strongest estimated: VI, strong shaking
Peak ground acceleration: 25.8% of gravity
Peak ground velocity: 3.4 cm/s
Map: Automatic

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

Did you feel it?

No one has reported feeling this quake to the USGS.

Fault motion and ground failure

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

Moment magnitude: 6.0 Mw

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 0.4 km horizontally, 0.9 km in depth
Magnitude uncertainty: ±0.02
Depth from: From location
Station coverage gap: 129°
Stations used: 201

Nearest places

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

Nearby

Within 100 km, magnitude 2.5 and up: 117 in the 60 days after this one and 1 in the 30 days before it.

After

The first 60 of 117.

Before

3.922 km WNW of Klamath Falls, OregonMon, Sep 20, 8:16 PM PDT · 12054 days ago · 6 km deep · 1 km away

Earthquakes today Oregon earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10313718 (also filed as choy19930921032855, gcmtb092193a, usp00060qd, nc30029004, gcmt19930921032855, ci3123127, iscgem209100). Read Tue, Sep 22, 2026, 8:28 AM UTC.