Deciphering deformation styles of inland plate boundaries by InSAR

利用合成孔径雷达数据，我们检测到地壳形变信号与几个内陆地震和周围的大陆板块边界。所有的数据都揭示了意外的信号，这些信号不能从断层源的即时地震学估计中预测出来，因此如果不使用SAR，这些信号就会被忽略。我们发现了一个长期持续的余震，由于M5地震在查曼断层，阿富汗。包括1996年大边地震、2007年中越地震、2008年岩手-宫城地震、2008年玉田地震、2008年汶川地震在内的所有地震都显示了复杂的地壳位移，即使考虑到分布滑动，也不能用单一的矩形断层来解释，这表明几何复杂性是内陆地震的普遍特征。在Oakbe和Chuetsu-oki事件中，我们还检测到了主震断层外的重要信号，这些信号归因于地震断层运动。

Using SAR data, we detected crustal deformation signals associated with several inland earthquakes in and around continental plate boundaries. All the data revealed unexpected signals that could not be predicted from the prompt seismological estimates of the fault sources, and thus would be overlooked if SAR were not used. We discovered a long-lasting afterslip due to the M5 earthquake at the Chaman fault, Afghanistan. All the events, including the 1996 Onikobe, 2007 Chuetsu-oki, 2008 Iwate-Miyagi, 2008 Yutian, 2008 Wenchuan, revealed complex crustal displacements that could not be explained by a single rectangular fault even with distributed slip, which suggest that a geometric complexity is a universal character of inland earthquakes. In the Onikobe and Chuetsu-oki events, we also detected significant signals outside the main shock fault that were attributed to aseismic fault motion.