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Depth and region dependence of b-value for micro-aftershocks of the May 12th,2008 Wenchuan earthquake and its tectonic implications
Authors:Mei Feng Meijian An Lin Zhao  Jizhong Zhang Institute of Geomechanics  Chinese Academy of Geological Sciences  Beijing  China
Institution:Mei Feng Meijian An Lin Zhao and Jizhong Zhang Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China
Abstract:Micro-aftershocks with magnitude range of 1.5?4 around the Wenchuan earthquake epicenter,the southern part of the Longmenshan fault zone,exhibit good frequency-magnitude linear relationships,thus enabling b-value analysis.The average b-value for micro-aftershocks of M1.5?4 from July to December of 2008 in our local study region is about 0.88,similar to the b-value for all aftershocks of M3.0?5.5 from May,2008 to May,2009 along the whole Longmenshan fault zone.The similarity between the local and regional b-...
Keywords:micro-aftershocks  frequency-magnitude relationship  tectonic implication  Wenchuan earthquake  
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