TY - RPRT TI - Processed strong-motion data for the central Chile aftershock of April 9, 1985; nine accelerograph sites owned by CHILECTRA, ENDESA, and the Department of Geology and Geophysics, University of Chile AU - K.W. Campbell PY - 1990 DO - 10.3133/ofr9046 UR - https://pubs.usgs.gov/publication/ofr9046 ID - ofr9046 ER -