Historic Earthquakes

Klamath Falls, Oregon
1993 September 21 03:28:55 UTC Magnitude 6.0
1993 September 21 05:45:33 UTC Magnitude 6.0

September 21 03:28:55
The Klamath Falls earthquakes caused two deaths and approximately 7.5 million U.S. dollars in damage. One person was killed when the car he was driving was crushed by a boulder in an earthquake-induced rockfall and another person died of a heart attack. More than 1,000 homes and commercial buildings were damaged. Maximum intensity VII in downtown Klamath Falls and at the Oregon Institute of Technology about three kilometers north of downtown. Three highways leading to Klamath Falls were temporarily closed because of rockfalls or concern about possible damage to bridges. Rockfalls and rockslides occurred in roadcuts and on steep slopes throughout the epicentral region. Ground cracks in fill material were observed at several locations in the area. Felt in southern Oregon as far north as Eugene and in northern California as far south as Redding.

September 21 05:45:33
Additional damage in the Klamath Falls area. At some locations northwest of Klamath Falls this earthquake produced higher intensities than the event which occurred at 03:28.

An aftershock of M5.4 occurred on December 04, 1993, at 22:15:19 UTC, which caused additional damage (VII) at Klamath Falls. It also caused slight damage (VI) at Tulelake, California.