TY - RPRT TI - Geological aspects of the May 31, 1970, PerĂº earthquake AU - George Plafker AU - G. E. Ericksen AU - Jamie Fernandez Concha PY - 1971 DO - 10.1785/bssa0610030543 UR - https://pubs.usgs.gov/publication/70205589 ID - 70205589 ER -