Structure contour map of segments of the Puente Hills blind thrust (PHT) showing the location of the 1987 Whittier Narrows (M w 6) earthquake sequence (Hauksson and Jones, 1989) as relocated by Shaw and Shearer, (1999). Discovered in 1999, the Puente Hills Thrust might be the most feared fault in the city of LA. The urgency to find hidden faults was underscored by the Northridge quake. Santa Monica Fault. Sixteen years later, a section of the Puente Hills thrust fault ruptured in the magnitude 5.9 Whittier Narrows earthquake, killing eight people in East Los Angeles and bringing attention to a class of thrust faults that do not break the surface, called “blind” thrust faults, which will go on to form a key part of this story. The earthquake that shook Southern California on Friday is serving as a reminder to seismologists that the Puente Hills thrust fault could produce an even more disastrous event. Also online at CGS: the latest state geologic map and fault activity maps (released last year) and 10 regional geologic maps; a Geologic Atlas of California’s 27 maps, produced between 1958 and 1959, will be available online soon, according to the agency. Map courtesy of SCEC. St. Pius V Catholic Church suffered … 626 … A hypothetical earthquake here epicentered south of USC was called the “worst case for Los Angeles” in a 2017 city report.

Structure contour map of segments of the Puente Hills blind thrust (PHT)showing the location of the 1987 Whittier Narrows (Mw 6) earthquake sequence (Hauksson and Jones, 1989) as relocated by Shaw and Shearer, (1999). The Puente Hills Fault is the red horizontal line dividing the map in half. The Puente Hills fault could be especially hazardous over a larger area because of its shape. A major quake on the Puente Hills fault system – for example, a magnitude 7.5 – could cause some $250 billion in damage, depending on the time and day of the week, and kill 3,000 to 18,000 people. Multiple Fault Lines Discovered Under Los Angeles Los Angeles fault lines map. The Puente Hills Fault (also known as the Puente Hills thrust system) is an active geological fault that is located in the Los Angeles Basin in California.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. Earthquake fault maps for Beverly Hills, Santa Monica and other Westside areas.

Map by CGS .

The Puente Hills thrust fault, which brought Friday night's magnitude-5.1 quake centered in La Habra and well over 100 aftershocks by Sunday, … The map counts 60 in all, including the Whittier fault system, which includes Puente Hills. In California, the Puente Hills thrust fault, which brought Friday night's quake centred in La Habra and more than 100 aftershocks by Sunday, … Here’s how LA could be disrupted by potential quakes on five known local faults — and how leaders are preparing for the worst. Seismologists warned that a bigger earthquake from the Puente Hills thrust fault, which caused Friday night’s magnitude-5.1 quake in La Habra and hundreds of aftershocks, could be catastrophic.

Puente Hills Thrust. Puente Hills Blind-Thrust System, Los Angeles, California 2947 Figure 1. Puente Hills Blind-Thrust System, Los Angeles, California 2947 Figure 1. The futility of predicting earthquakes is represented on this map, which does not show the Northridge fault line or the Puente Hills thrust fault (which was last week’s troublemaker). From north to south, the Puente Hills anticline, the Whittier fault, which trends N70 o W and cuts the steeply dipping south limb of the anticline along a 40 km strike-length, and the La Habra syncline characterize the structural setting of the Puente Hills (Figure 2). A major quake on the Puente Hills fault system – for example, a magnitude 7.5 – could cause some $250 billion in damage, depending on the time and day of the week, and kill 3,000 to 18,000 people. Sixteen years later, a section of the Puente Hills thrust fault ruptured in the magnitude 5.9 Whittier Narrows earthquake, killing eight people in East Los Angeles and bringing attention to a class of thrust faults that do not break the surface, called “blind” thrust faults, which will go on to … The Coyote Hills segment shows an active synclinal axial surface that coincides with the base of a 9‐m‐high scarp, consistent with tip‐line folding or the presence of a backthrust. A hypothetical earthquake here epicentered south of USC was called the “worst case for Los Angeles” in a 2017 city report .


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