M3.8 earthquake 19 km WNW of Klamath Falls, Oregon

A magnitude 3.8 earthquake struck 19 km WNW of Klamath Falls, Oregon on Mon, Sep 20, 1993, 9:16 PM PDT (04:16 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.

Map

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

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
3.8	Md, duration	Pacific Northwest Seismic Network	Preferred · Final · ±0.02 · 24 stations
4.4	mb, body-wave	USGS National Earthquake Information Center	Reviewed · 5 stations

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

Felt in the Klamath Falls area.

From the USGS event page for uw10313768. U.S. Geological Survey text and figures are in the public domain.

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

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

Within 100 km, magnitude 1.5 and up: at least 199 in the 60 days after this one and 11 in the 30 days before it.

The first 60 of at least 199.

From the USGS Earthquake Hazards Program and its partner networks, event uw10313768 (also filed as usp00060qq). Read Fri, Oct 2, 2026, 6:58 AM UTC.