The June 28, 1992 Big Bear earthquake in southern California was assum
ed to have ruptured along a northeast-trending plane, as suggested by
long-term aftershock distribution. No surface rupture was found, howev
er, and mainshock locations determined from both strong motion and TER
RAscope data are mutually consistent and do not lie on the assumed fau
lt plane. An integrated study involving waveform modeling, directivity
and seismicity analyses suggests a complex rupture pattern, with sign
ificant short- and long-period energy propagating northwest along the
presumed conjugate fault-plane.