TY  - RPRT
TI  - Foreshock seismic-energy-release functions; tools for estimating time and magnitude of main shocks
AU  - D. J. Varnes
PY  - 1987
DO  - 10.3133/ofr87429
UR  - https://pubs.usgs.gov/publication/ofr87429
ID  - ofr87429
ER  -