On 20 April 2013, nearly 5 years after the Wenchuan Ms 8.0 event of 12 May 2008, an earthquake of Ms 7.0 struck the Longmenshan fault zone in Lushan county of Sichuan province, China. Because the epicenters of the two events were only 90 km apart, and the aftershock areas were separated (Fig. 1), there has been great interest in both how the seismogenic structures of the two events interrelate, and whether events of Ms 7.0 or greater could recur in the southern segment of the Longmenshan fault zone. However, there are few data available on...

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