TY  - RPRT
TI  - Time varying spectral characteristics of strong ground motions; the Imperial Valley, California, earthquake of October 15, 1979
AU  - Erdal Safak
AU  - F.M. Bendimerad
PY  - 1986
DO  - 10.3133/ofr86443
UR  - https://pubs.usgs.gov/publication/ofr86443
ID  - ofr86443
ER  -