operates and maintains the State
Water Project Strong Motion Program to provide strong motion
accelerograms at Project facilities after a moderate to large earthquake.
The program is a cooperative effort between the USGS
and the USBR. Instruments include
both analog and digital. At present, all strong motion sites except
the Newville site and the Oroville receiver site are digitally instrumented
and linked to Earthquake
Engineering in Sacramento by fiber optic cable, broad spectrum
radio, telephone, or a combination of these. See the Instrumentation
section for a complete list of the instruments, locations, and types
in each field division.
The uses of the strong motion data are for structural information.
The Division of Engineering
(formerly the division of Design and Construction) funded the finite
element analysis of Oroville Dam after the 1975 Oroville earthquake
using data recorded during the earthquake. DOE
will use any data collected by the Delta Array for the Seismic Stability
Evaluation of Delta Levees. The Division
of O&M funded the Dynamic Structural Analysis of the San
Luis Dam bridge for the Maximum Crdeible Earthquake using the
accelrograms recorded on the Intake Structure during the 1989 Loma
The data is used by Department engineers in the Design sections,
geologists in the Project
Geology section, engineers and geologists in the Division
of Safety of Dams, and O&M
engineers in their performance reports. FERC
requires seismic data be available after an earthquake. Consulting
boards convened for annual five year inspections request strong
motion data for their reports. Bulletin 203-77 and 203-78 use the
strong motion data.