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. Supershear earthquakes, moving faster than seismic waves, could cause catastrophic shaking across california Scientists caution that california faces a hidden seismic danger
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“supershear” earthquakes that move faster than seismic waves, producing shock fronts similar to sonic booms
These rare but powerful ruptures could unleash more violent shaking over wider areas than typical quakes, putting cities near major faults at risk
What is a supershear earthquake Energy bunches up into a shock front, delivering an intense initial jolt—then the ongoing rupture drives prolonged shaking This “ double strike ” can be more damaging than in typical quakes of the same magnitude. Normally, the rupture front in a typical quake moves slower than these waves
But when it exceeds that threshold — around 3 to 4 kilometers per second, depending on the rock type — the energy can. But by the turn of the century, there had been only one earthquake globally that some scientists suspected was a supershear event — the magnitude 6.4 imperial valley earthquake in 1979 It was only in the late 1990s that the idea of supershear earthquakes began to be taken more seriously.
