The Elsinore Fault Zone is a large geologic fault structure in Southern California. Geologic faults, fault lines or simply faults are planar rock fractures, which show evidence of relative movement. ... Official language(s) English Capital Sacramento Largest city Los Angeles Area  Ranked 3rd  - Total 158,302 sq mi (410,000 km²)  - Width 250 miles (400 km)  - Length 770 miles (1,240 km)  - % water 4. ...

The Elsinore fault zone runs from the mountainous region between El Centro and San Diego, northwest to Chino Hills. On the southern end of the fault zone is the southeastern extension of the Elsinore fault zone, the Laguna Salada Fault. At its northern end, the Elsinore fault zone splits into two segments, the Chino Fault and the Whittier Fault. El Centro is the county seat of Imperial County, California, United States. ... Nickname: Location of San Diego within San Diego County Coordinates: , Country United States State California County San Diego Founded July 16, 1769 Incorporated March 27, 1850 Government  - Mayor Jerry Sanders  - City Attorney Michael Aguirre  - City Council Scott Peters Kevin Faulconer Toni Atkins Tony Young Brian Maienschein Donna Frye Jim Madaffer... Location of Chino Hills within Southwestern San Bernardino County, California. ... The Whittier Fault is a geologic fault that is a branch of the Elsinore Fault Zone in Southern California. ...

The Elsinore fault zone, not including Whittier, Chino, and Laguna Salada faults, is 180 kilometers (111 miles) long. Its slip rate is 4.0 millimeters/year (0.15 in/yr). It is estimated that this zone is capable of producing a quake of M_W6.5 - 7.5 on the moment magnitude scale. The projected interval between major rupture events is 250 years. The moment magnitude scale was introduced in 1979 by Tom Hanks and Hiroo Kanamori as a successor to the Richter scale and is used by seismologists to compare the energy released by earthquakes. ...

The main fault zone is one of the quietest in California, producing only one quake in known history, an estimated magnitude 6 on the Richter Scale in 1910 but the quake did little damage and produced no surface rupturing. The Richter magnitude test scale (or more correctly local magnitude ML scale) assigns a single number to quantify the size of an earthquake. ...