Agbabian Associates installed the Hollister Earthquake Observatory (HEO) in 1991 with funding from the Kajima Engineering and Construction Corp. Kajima Corp donated this array to the University of California, Santa Barbara in January 1998. The site is located in the Salinas Valley about 10 kilometers from the San Andreas fault near the cities of Hollister and Salinas in central California. The ground motion array consists of a vertical array of six accelerometers in Quaternary alluvium and bedrock, and three accelerometers installed at a remote rock station, 3 km to the Northeast. The location of HEO along the San Andreas Fault in Central/Northern California increases our chances of recording a moderate to large earthquake.



The UCSB Geotechnical Array monitoring program is funded by the United States Nuclear Regulatory Commission (NRC)  under
Contract# NRC-HQ-60-15-C-0001 Project title: "Observations and Analysis of Geotechnical Array Data"

This site previously funded (2004 to 2014) by the Geoge E. Brown, Jr. Network for Earthquake Engineering Simulation (NEES) Program of the National Earthquake Hazards Reduction Program (NEHRP) of the National Science Foundation (NSF) under Award Number CMMI-0927178.