Structural damage, consisting mainly of cracks
in chimneys and walls, broken windows and
plaster, and loosened light fixtures, occurred
at several schools, hospitals, and houses in the
Oroville-Thermalito area. Many chimneys toppled
or had to be taken down in Oroville and Palermo.
Property damage was estimated at $2.5 million.
This earthquake was associated with the first
recorded surface faulting in the western
foothills of the Sierra Nevada. New fractures
in the ground were observed in a 3.8-km-long
north- to north-northwest-trending zone. The
block east of the fault moved upward relative to
that on the west, as shown by about 55 mm of
slip across the surface ruptures and 180 mm of
vertical movement of benchmarks near the rupture
zone. Felt over a large area of northern
California and western Nevada.
Abridged from Seismicity of the United States, 1568-1989 (Revised), by Carl W. Stover and Jerry L. Coffman, U.S. Geological
Survey Professional Paper 1527, United States Government Printing Office, Washington: 1993.