Earthquake Information
Chronological Earthquake Index
Elmore Ranch Earthquake
TYPE OF FAULTING: left-lateral strike-slip
TIME: November 23, 1987 / 5:54:15 pm PST
LOCATION: 33° 05' N, 115° 46.5' W 29 km (17 miles) SE of Salton City roughly 145 km (90 miles) east of San Diego
MAGNITUDE: MW6.2
DEPTH: Elmore Ranch (main, West, and East branches), Lone Tree, and Kane Spring (main and East branches)
FAULTS RUPTURED: Elmore Ranch (main, West, and East branches), Lone Tree, and Kane Spring (main and East branches)
MAXIMUM SURFACE OFFSET: 12.5 cm
Superstition Hills Earthquake
TYPE OF FAULTING: right-lateral strike-slip
TIME: November 24, 1987 / 6:15:57 am PST
LOCATION: 33° 00.8' N, 115° 50.3' W 32 km (20 miles) SSE of Salton City roughly 145 km (90 miles) east of San Diego
MAGNITUDE: MW6.6
DEPTH: 11.2 km
FAULTS RUPTURED: Superstition Hills, Wienert; Slip was triggered on the Imperial, San Andreas, and Coyote Creek faults
MAXIMUM SURFACE OFFSET: 50 cm after the first 24 hours; additional slip continued for months, to a maximum of roughly 1 meter total offset
