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The thrust fault was discovered in 1999 and runs about 40 km (25 mi) in three discrete sections from the Puente Hills region in the southeast to just south of Griffith Park in the northwest. The fault is known as a blind thrust fault, as the fault plane does not extend to the surface. Large earthquakes on the fault are relatively infrequent but ...
Diagram of blind-thrust faulting. As shown in the diagram, a weak plate under compression generally forms thrusting sheets, or overlapping sliding sections. This can form a hill and valley landform, with the hills being the strong sections, and the valleys being the highly disturbed thrust faulted and folded sections.
The Puente Hills thrust fault system is in a broad zone directly underneath the densest parts of the L.A. area, including downtown Los Angeles, which has many old and unretrofitted buildings, as ...
The La Habra earthquake was caused by oblique thrust faulting on the Coyote Hills segment of the Puente Hills Thrust Fault System. [1] [3] The Puente Hills Fault is a blind thrust fault that runs north and west from Orange County to Los Angeles. It was the fault that was responsible for the 5.9 M w 1987 Whittier Narrows earthquake on October 1 ...
A magnitude 7.5 quake in the Puente Hills thrust fault system — which runs under highly populated areas of L.A. and Orange counties — could kill 3,000 to 18,000 people, according to the U.S ...
The mainshock occurred near the northwestern border of Puente Hills 3 km (1.9 mi) north of the Whittier Narrows at a depth of 14 km (8.7 mi). First motion polarities, along with modeling of teleseismic P and S waves, established that the thrust fault responsible for the shock strikes east–west with a dip of 25° dip to the north. The shock ...
The Chino Fault and Whittier Fault are the two upper branches of the Elsinore Fault Zone, [2] which is part of the trilateral split of the San Andreas Fault system. The right-lateral strike-slip fault has a slip rate of 1.0 millimeter/year and is capable of producing anywhere from a M w 6.0 to a M w 7.0 earthquake.
Port Hills Fault: South Island, New Zealand: Oblique-thrust: Active: 2011 Christchurch (M6.3) Puente Hills Thrust: 40: San Gabriel Valley, United States: Blind thrust: Active: 1987 Whittier Narrows (M5.9) Queen Charlotte-Fairweather Fault: 800: Canada and Alaska: Dextral: Active: 1949 Graham Island (M8.1), 1958 Lituya Bay (M7.8), 2012 Haida ...