TY  - RPRT
TI  - Time-to-failure analysis of seismicity preceding the 1989 Loma Prieta earthquake
AU  - C. G. Bufe
AU  - D. J. Varnes
PY  - 1990
DO  - 10.3133/ofr90666
UR  - https://pubs.usgs.gov/publication/ofr90666
ID  - ofr90666
ER  -