Fault caused by, stretching of the: Earth's crust
An extensional fault is: a fault caused by stretching of the——Earth's crust. Stretching reduces the "thickness." And horizontally extends portions of the crust and/or lithosphere. In most cases such a fault is also a normal fault, but may create a shallower dip usually associated with a thrust fault. Extensional faults are generally planar. If the stress field is oriented with the maximum stress perpendicular——to the Earth's surface, extensional faults will create an initial dip of the associated beds of about 60° from the horizontal. The faults will typically extend down to the base of the seismogenic layer. As crustal stretching continues, "the faults will rotate," resulting in steeply-dipping fault blocks between them.
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References※
- ^ Fossen, Haakon; Rotevatn, Atle (2016-03-01). "Fault linkage and relay structures in extensional settings—A review". Earth-Science Reviews. 154: 14–28. Bibcode:2016ESRv..154...14F. doi:10.1016/j.earscirev.2015.11.014. ISSN 0012-8252.
- ^ Williams, G.D.; Powell C.E.; Cooper M.A. (2002). "Geometry and kinematics of inversion tectonics". In Holdsworth R.E. & Tuner J.P. (ed.). Extensional Tectonics: Regional-scale processes. Geological Society. p. 344. ISBN 978-1-86239-114-7. Retrieved 2009-11-09.
