| Processes of the displacement field change of the 2009 April 6 M_W6.3 L’Aquila earthquake using persistent scatterer and small baseline methods |
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| 作者姓名： | Sanming Luo Liming Fu Shuang Zhu Qinglong He Wenni Wan Bo Yang |
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| 作者单位： | First Crust Monitoring and Application Center, China Earthquake Administration |
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| 基金项目： | supported by Director Foundation of the Institute of Seismology,China Earthquake Administration(IS201266111);the Seism Science &Technology Spark Program of China Earthquake Administration(XH13036);Earthquake Industry Research Special Project(201308009) |
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| 摘 要： | Using a time series method that combines both the persistent scatterer and small baseline approaches, we analyzed 9 scenes Envisat ASAR data over the L＇Aquila earthquake, and obtained a Shocke＇s displacement field and its evolution processes. The results show that： （1） Envisat ASAR clearly detected the whole processes of displacement field of the L＇Aquila earthquake, and distinct variations at different stages of the displacement field. （2） Preseismic creep displacement → displacement mutation when faulting → constantly slowed down after the earthquake. （3） The area of the strongest deformation and ground rupture was a low-lying oval depression region to the southeast. Surface faulting within a zone of about 22 km× 14 km, with an orientation of 135°, occurred along the NW-striking and SW-dipping Paganica-S. Demetrio normal fault. （4） In analyzing an area of about 54 km x 59 km, bounded by north-south axis to the epicenter, the displacement field has significant characteristics of a watershed： westward of the epicenter shows uplift with maximum of 130 mm in line-of-sight （LOS）, and east of the epicenter was a region with 220 mm of maximum subsidence in the LOS, concentrating on the rupture zone, the majority of which formed in the course of faulting and subsequence.
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| 关 键 词： | 位移场 线方法 地震 散射 永久 ENVISAT 时间序列方法 SAR数据 |
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