A new tectonic discontinuity in the Betic Cordillera deduced from active tectonics and seismicity in the Tabernas Basin

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• 作者：Carlos Sanz de Galdeano ; Stefan Shanov ; Jesú ; s Galindo-Zald&#xed ; var ; Alex ; er Radulov ; Gabriel Nikolov
• 关键词：Betic Cordillera ; Normal faults ; Strike-slip faults ; Paleostress ; Earthquakes
• 刊名：Journal of Geodynamics
• 出版年：2010
• 出版时间：August 2010
• 年：2010
• 卷：50
• 期：2
• 页码：57-66
• 全文大小：3002 K

文摘

In the Tabernas Desert, a Neogene basin situated in SE Spain, major E-W folds coexist with large E-W dextral faults and abundant NNW-SSE faults. These faults affect the Plio-Quaternary sediments. The palaeostress ellipsoids indicate a roughly constant tension (σ<sub>3sub> axe) in the ENE-WSW direction, coexisting with a changeable direction of the main compression (σ<sub>1sub> axe) from the vertical to the NW-SE direction. The numerous NNW-SSE faults in southern areas, directly to the east of the city of Almer&#xed;a, tend to propagate northwards, forming a tectonic discontinuity of the Betic Internal Zone. The 2002 seismic swarm of the Gergal earthquake occurred in this NNW-SSE fault zone. In this setting, the E-W fractures act as transfer faults.