Peak accelerations from the 1992 Landers and Big Bear, California, earthquakes


Peak ground accelerations (PGA) at 181 sites for the Landers Mw 7.3 earthquake and at 85 sites for the Big Bear Mw 6.2 aftershock are compared to the Joyner and Boore (1988) (JB) attenuation relationships and examined for spatial variations. This study finds five results which are discussed. The observed difference between soil- and rock-site PGA's between 60 and 100 km for the Landers data set may be a combination of higher values of PGA recorded at soil sites in basins, an S-wave radiation maximum in the San Bernardino area, and directivity effects. -from Authors

Publication Title

Bulletin - Seismological Society of America

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