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Processes of the displacement field change of the 2009 April 6 MW6.3 L’Aquila earthquake using persistent scatterer and small baseline methods |
Sanming Luo, Liming Fu, Shuang Zhu, Qinglong He, Wenni Wan, Bo Yang |
First Crust Monitoring and Application Center, China Earthquake Administration, Tianjin 300180, China |
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Abstract 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 × 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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Received: 14 January 2013
Published: 16 November 2013
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Fund:Director Foundation of the Institute of Seismology, China Earthquake Administration(IS201266111), the Seism Science & Technology Spark Program of China Earthquake Administration(XH13036) and Earthquake Industry Research Special Project (201308009). |
Corresponding Authors:
Sanming Luo
E-mail: luosanming@yahoo.com
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[1] |
Yujun Du, Zemin Wang, Shujiang Yang, Jiachun An, Qiang Liu, Guowei Che. Co-seismic deformation derived from GPS observations during April 20th, 2013 Lushan Earthquake, Sichuan, China[J]. Earthquake Science, 2013, 26(3-4): 153-160. |
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