‘Quake’ Probably a Sonic Boom
Phone calls from earthquake-jittery residents flooded police switchboards after a sharp jolt rattled the Los Angeles Basin at about 9:30 this morning, but experts at Caltech’s seismological laboratory in Pasadena said that what people had felt was probably a sonic boom.
A lab spokesman said there was a “light aftershock” at 9:40 a.m. from last Sunday’s quake off Oceanside, “but it was so small that you couldn’t have felt it here.” This morning’s sonic jolt was felt from Malibu to La Verne. The Oceanside quake, which measured 5.3 on the Richter scale, was preceded last week by a much more powerful 5.9 quake in the Palm Springs that injured 29 and caused damage estimated at $6 million.
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