Fault-trapped waves depict continuity of the fault system responsible for the 6 April 2009 M_W 6.3 L'Aquila earthquake, central Italy

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• 作者：Giovanna Calderoni ; ^{giovanna.calderoni@ingv.it} ; Rita Di Giovambattista ; Paola Vannoli ; Stefania Pucillo ; Antonio Rovelli
• 关键词：6 April 2009 L'Aquila earthquake ; Paganica Fault ; normal fault system ; fault-zone trapped waves ; fluid pressure ; central Apennines
• 刊名：Earth and Planetary Science Letters
• 出版年：2012
• 期刊代码：18_0012821x
• 类别：ph
• 出版时间：15 March, 2012
• 卷：323-324
• 期：Complete
• 页码：1-8
• 文件大小：1587 K

摘要

We investigate fault-trapped waves observed at a permanent broad-band station (FAGN) installed on the San Demetrio Fault, about 20 km southeast of L'Aquila. This fault has the same strike of the Paganica Fault which was responsible for the M_W 6.3, 6 April 2009 earthquake. The two faults display an en-echelon pattern with a few km offset. We have found that events causing efficient trapped waves are clustered at the northwestern and southeastern bottom ends of the ruptured Paganica fault plane. The efficiency of trapped waves at FAGN, which is located about 5 km far from the ruptured fault plane, indicates that the two faults are linked at depth. This suggests that fault segments in the study area can be part of a longer and continuous fault system which controls the seismic hazard of the region. Moreover, we have found that the two earthquake clusters generating the most efficient trapped waves occur in portions of the fault system with the highest fluid pressure.