Are Supershear Earthquakes Even More Dangerous Than We Thought?

Long-time Slashdot reader Bruce66423 shared this article from the Los Angeles Times:

Scientists have increasingly observed how the rupturing of a fault during an earthquake can be even faster than the speed of another type of damaging seismic wave, theoretically generating energy on the level of a sonic boom. These shock waves — created during 'supershear' earthquakes — can worsen how bad the ground shakes both side to side and up and down along an affected fault area, scientists at USC, Caltech and the University of Illinois Urbana-Champaign wrote in a recent opinion article for the journal Seismological Research Letters. Although not everyone agrees that supershear earthquakes are inherently more destructive than other types, the potential implications are massive and need to be accounted for in seismic forecasts, the scientists contend... In just the last 15 years, 14 of 39 large strike-slip earthquakes have exhibited features of supershear ruptures, the opinion article said....

In California, supershear earthquakes would be expected on the straightest of 'strike-slip' faults — in which one block of earth slides past another — like the San Andreas... There are a number of communities directly on top of the San Andreas fault. Among them are Coachella, Indio, Cathedral City, Palm Springs, Desert Hot Springs, Banning, Yucaipa, Highland, San Bernardino, Wrightwood, Palmdale, Gorman, Frazier Park, San Juan Bautista, Palo Alto, Portola Valley, Woodside, San Bruno, South San Francisco, Pacifica, Daly City and Bodega Bay.

One earthquake scientist suggests building codes need to be more strict, according to the article.

But it also cites a U.S. Geological Survey research geophysicist who isn't convinced by the new opinion article. 'I don't think we know yet whether supershear ruptures really are more destructive.'

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