Source Parameters of the 2009 L ′Aquila Earthquake, Italy from Envisat and ALOS Satellite SAR Images
详细信息
- 责任者：Wen Yangmao (School of Geodesy and Geomatics ; Wuhan University ; Wuhan 430079 ; China) ; He Ping
- 刊名：Chinese Journal of Geophysics
- 出版年：2012
- 卷期：55(1)
- 关键词：合成孔径雷达 ; synthetic aperture radar ; 强震 ; strong earthquakes ; 意大利 ; Italy
- 页码：p.53-65
- 图表：5 illus., 2 tables, 30 refs.
- 分类号：1600
- issnNo：ISSN0001-5733
- isbnNo：CN11-2074/P
摘要
On the 6th April 2009,an Mw6.3 earthquake occurred in the region of L′Aqula of Italy,which caused more than 300 people to lose their lives.In this paper,the Envisat and ALOS satellite interferograms with different incidences and wavelengths are used to invert for the source parameters of the fault activated during the earthquake.Firstly,two-pass interferometry technique is used to obtain the coseismic deformation covering the whole epicenter region,then a combination method of quad-tree and uniform sample is employed to down-sample the original observed datasets.Secondly,the rectangle and triangle dislocation models in elastic half-space and an automated fault discretization method are used to derive the geometric and kinematic characteristic of fault combining with GPS surface displacement measurements.The best-fit solution shows that the distributed slip model can explain the data very well.The inversion result indicates that the fault is dominated by normal movement with small right-lateral strike-slip component.The shortest and longest length of the optimal fault patches based on the observing data are 0.4 km and 6.3 km,respectively.The fault slip concentrates mainly in the shallow depth between 5 km and 14 km,and the maximum slip is about 1.07 m.The inverted geodetic moment is 3.43×1018 N·m(Mw6.32),which is excellently consistent with the result of seismology.