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Quake Was Centered At Intersection Of Two Faults

December 5, 1988

PASADENA, Calif. (AP) _ The pre-dawn earthquake that jarred slumbering Southern Californians involved a fault that caused a deadly aftershock a year ago but was of a different type than the previous temblor.

Saturday’s quake, which measured 5.0 on the Richter scale, was centered 10 miles beneath City Hall where the Raymond Hill Fault intersects an unnamed fault discovered after it caused a 5.3-magnitude aftershock of the Whittier Narrows quake last year, said Kate Hutton, a seismologist at the California Institute of Technology.

″Because it is an intersection of two faults, it’s been difficult to tell which one caused the earthquake,″ she said.

The latest temblor was a ″strike-slip″ quake in which two plates grind against each other to move the ground horizontally, Ms. Hutton said.

It contrasted with the vertical motion of the ″surge″ quakes that marked the 5.9-magnitude Whittier temblor on Oct. 1, 1987. That quake and its aftershock caused eight deaths and an estimated $358 million in damage in metropolitan Los Angeles.

Saturday’s 3:38 a.m. quake rattled windows, knocked items off store shelves and caused at least 32 minor injuries, mostly bumps and bruises suffered when people tripped or ducked for cover, authorities said.

A 36-year-old Burbank man shot himself in the foot when he mistook rattling windows for an intruder, and an 80-year-old Atwater woman fell and broke her hip, nursing supervisors said.

Authorities found no damage to City Hall or the 66-year-old, 100,000-seat Rose Bowl, said Fire Capt. Duncan Baird. The most damage appeared to be at the 200-year-old San Gabriel Mission, which lost a few bricks, police in San Gabriel said.

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