Merchandise is strewn across the floor in a La Habra Walgreens following a 5.1 earthquake centered near La Habra Friday night.
BLAINE OHIGASHI,, BLAINE OHIGASHI, AP
LA HABRA – Experts say a bigger earthquake along the lesser-known fault that gave northern Orange County a moderate shake could do more damage to the region than the long-dreaded “Big One” from the more famous San Andreas Fault.
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, stretches from northern Orange County under downtown Los Angeles into Hollywood.
A magnitude-7.5 earthquake along that fault could prove more catastrophic than one along the San Andreas, which runs along the outskirts of metropolitan Southern California, according to seismologists.
The U.S. Geological Survey estimates that such a quake along the Puente Hills fault could kill 3,000 to 18,000 people and cause up to $250 billion in damage. In contrast, a larger magnitude 8 quake along the San Andreas would cause an estimated 1,800 deaths.
In 1987, the fault caused the Whittier Narrows earthquake. Still considered moderate at magnitude 5.9, that quake killed eight people and did more than $350 million in damage.
Part of the problem with the potential damage is that the fault runs near so many vulnerable older buildings, many made of concrete, in downtown Los Angeles and Hollywood. And because the fault, discovered in 1999, is horizontal, heavy reverberations are likely to be felt over a wide area.
The shaking from a 7.5 quake in the center of urban Los Angeles could be so intense it would lift heavy objects in the air, like the 1989 Loma Prieta Earthquake in Northern California, where the shaking was so bad “we found an upside-down grand piano,” USGS seismologist Lucy Jones told the Los Angeles Times.
That would “hit all of downtown,” Jones said. “And everywhere from La Habra to Hollywood.”
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