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 × 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.
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.
基金资助: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).
通讯作者:
Sanming Luo
E-mail: luosanming@yahoo.com
引用本文:
Sanming Luo, Liming Fu, Shuang Zhu, Qinglong He, Wenni Wan, Bo Yang. Processes of the displacement field change of the 2009 April 6 MW6.3 L’Aquila earthquake using persistent scatterer and small baseline methods[J]. 《地震学报》英文版, 2013, 26(5): 293-299.
Sanming Luo, Liming Fu, Shuang Zhu, Qinglong He, Wenni Wan, Bo Yang. Processes of the displacement field change of the 2009 April 6 MW6.3 L’Aquila earthquake using persistent scatterer and small baseline methods. Earthquake Science, 2013, 26(5): 293-299.