Concerns about a bigger ” Big One ”

LA HABRA, Calif. (AP) — Experts say a bigger earthquake along the lesser-known fault that gave Southern California 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, stretches from northern Orange County under downtown Los Angeles into Hollywood — a heavily populated swath of the Los Angeles area.

Seismologists tell the Los Angeles Times that 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.

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.

Meanwhile, a 4.8 earthquake shook the northern part of Yellowstone National Park early Sunday.

The University of Utah Seismograph Stations reports the earthquake occurred at 6:34 a.m. about 4 miles north-northeast of the Norris Geyser Basin. The university reports it was felt in the Montana border towns of West Yellowstone and Gardiner, both about 20 miles from the epicenter.

There were no immediate reports of damage. There are few visitors in the park this time of year.

Yellowstone sees frequent small earthquakes. Since Thursday, there have been at least 25 recorded in the nation's first national park.