3-D slip analyses of listric faults with ideal geometries. (February 2020)

• Record Type: Journal Article
• Authors: Mukherjee, Soumyajit; Chakraborty, Megha
• Is Part Of: Marine and petroleum geology. Volume 112(2020)
• Publication Date: 2020-02
• Subjects: Tribology -- Deformation mechanism -- Brittle shear -- Kinematic modeling -- Brittle deformation -- Tectonics; Submarine geology -- Periodicals; Petroleum -- Geology -- Periodicals; Géologie sous-marine -- Périodiques; Pétrole -- Géologie -- Périodiques; Petroleum -- Geology; Submarine geology; Periodicals; Electronic journals; 551.468
• DOI: 10.1016/j.marpetgeo.2019.104092
• Languages: English
• ISSNs: 0264-8172

Abstract

Abstract: Studying the kinematics of listric faults is of great importance in petroleum geology and seismicity. The deformation related to listric faults differ from the planar fault plane case. This study involves 3-D co-ordinate geometry with spherical co-ordinates to deduce the effective-slip ( e s ) and the net-slip ( n s ) of listric faults of three ideal geometries: spherical, paraboloid and ellipsoidal. We perform 3D slip analyses on two types of listric faults (Type-1 and 2). Previous authors have considered these shapes of fault planes in their modeling. Using these e s, one can track material points before and after faulting, similar to Mukherjee (2019) applied on translational faults with planar fault planes. The n s can be divided into a strike-slip ( s n s ) and a dip-slip component ( d n s ). This resolution being done on the listric fault plane itself, n s ≠ ( s n s 2 + d n s 2 ) 0.5 . This is unlike the planar fault plane case. The purpose of 3D-geometric analysis of listric faults could be, in long run, the restoration of rock blocks that underwent listric faulting. Highlights: Kinematics of listric faults with ideal geometries are analyzes using 3-D co-ordinate geometry. "Effective slip" is defined and its expressions for listric faults are deduced. This work will be important in fault block restoration and modeling.