TY - RPRT TI - Earthquake stress drop, source spectra from laboratory experiments, and the apparent unsteadiness of frictional slip AU - Brian D. Kilgore AU - Nicholas M. Beeler PY - 2025 DO - 10.1785/0120240123 UR - https://pubs.usgs.gov/publication/70277765 ID - 70277765 ER -