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El Tigre Fault
The El Tigre Fault is a 120 km long, roughly north-south trending, major strike-slip fault located in the Western Precordillera in Argentina.〔 The Precordillera lies just to the east of the Andes mountain range in South America.〔 The northern boundary of the fault is the Jáchal River and its southern boundary is the San Juan River.〔 The fault is divided into three sections based on fault trace geometry, Northern extending between 41–46 km in length, Central extending between 48–53 km in length, and Southern extending 26 km in length.〔〔 The fault displays a right-lateral (horizontal) motion and has formed in response to stresses from the Nazca Plate subducting under the South American Plate.〔 It is a major fault with crustal significance.〔 The Andes Mountain belt trends with respect to the Nazca Plate/South American Plate convergence zone, and deformation is divided between the Precordilleran thrust faults and the El Tigre strike-slip motion.〔 The El Tigre Fault is currently seismically active.〔
==Geology==
El Tigre Fault is a right-lateral N10°E trending fault,〔 known for its good grade of exposures and markers of horizontal displacement.〔 Its linear traces are apparent throughout the length of the fault.〔 Morphology of El Tigre strike-slip fault is visible on the western slope of the Precordillera fold and thrust belt.〔 With evidence of activity during the Middle Pleistocene 〔〔 to present day, it is considered a Quaternary fault.〔 Geomorphic and 10Be (Beryllium) exposure ages have been used in some studies to estimate the Quaternary age and slip rate.〔 Slip rate is estimated to be approximately 1 mm/year〔 and offsets range from 60 to 180 m.〔
The Nazca/South American oblique convergence zone off Chile is N76° 〔 and El Tigre releases the north-south stress component of continental plate motion 〔 at about 30°-31°.〔 In the San Juan Province, it is part of an east-verging thin-skinned belt,〔 and is located in a major active seismic area.〔 Moment magnitude estimates reveal that a 7 ± 0.5 scale earthquake could be produced.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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