Item 26 - Updated Hazard Mitigation Plan

Home Browse Search

Hazard Mitigation Plan | 2022 Earthquake Hazards - 59 - Elsinore Fault Zone The Elsinore fault zone lies approximately 18 miles East of the City. According to USGS, it’s projected to have a magnitude of 7.0 with a depth of 11.6 km. The Elsinore fault zone is a major dextral shear system, parallel to the southern San Andreas fault, that accommodates about 5 mm/year of the Pacific-North American Plate boundary slip. The northern elements of the fault zone, the Chino and Whittier faults, bound the Puente Hills, an uplifted block of Tertiary sediments. The Glen Ivy section forms the northeast boundary of the Santa Ana Mountains, and, together with the Temecula section, forms the Elsinore trough. To the southeast the fault zone (Temecula, Julian, and Coyote Mountain sections) cuts diagonally across various Peninsular Range batholithic and pre-batholithic metamorphic terrain until it reaches the southwestern margin of the Salton Trough as the Laguna Salada fault. Total strike-slip is reported to be as much as 40 km but is more likely only 10–15 km, and total vertical separation is about 200 m. Map: Shake Intensity Map – Elsinore Fault M7.5 (Source: USGS)