California on alert as San Andreas fault hints at a quake

Parkfield lies right on the San Andreas fault The tiny town of Parkfield in California has something unusual about it. Scientists are always eagerly studying it, because it is right on top of the San Andreas fault, and has been called the ‘earthquake capital of the world’. The famous faultline running from north to south of the Golden State will soon be due for a tremor, and all eyes are on the town as the potential epicentre.

Mr Malagnini’s study looked at seismic wave attenuation, which is how sound waves lose energy as they move and depends on the permeability of rock. Given that cracks up to 1.5km can open up before a quake, the sound conduction quality of the rock changes in that time too. ‘However, the behavior of the attenuation parameter in the last few years seems substantially different from the one that characterised the years prior to the 2004 mainshock,’ the study says.

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