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http://hdl.handle.net/2122/9430
Authors: | Bonini, L.* Basili, R.* Toscani, G.* Burrato, P.* Seno, S.* Valensise, G.* |
Title: | The role of pre-existing discontinuities in the development of extensional faults: an analog modeling perspective | Journal: | Journal of structural geology | Series/Report no.: | /74 (2015) | Publisher: | Elsevier Science Limited | Issue Date: | 2015 | DOI: | 10.1016/j.jsg.2015.03.004 | Keywords: | Extension Normal faults Pre-existing fault Analogue modeling Accommodation space Blind fault Active tectonics |
Subject Classification: | 04. Solid Earth::04.04. Geology::04.04.01. Earthquake geology and paleoseismology 04. Solid Earth::04.04. Geology::04.04.09. Structural geology 04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution |
Abstract: | Several mountainous regions are currently affected by syn- or post-orogenic active extension. We investigate how a newly-formed normal fault interacts with structures inherited from a previous contractional phase. To this end, we use analog models that adopt an innovative technique for performing a precut that mimics such inherited structures into a clay layer; this clay layer is laid on top of a master fault simulated by two rigid blocks sliding along an inclined plane. We carry out six experiments with variously oriented precuts and compare the results with those obtained in a reference isotropic experiment. All other conditions are identical for all seven realizations. Fault evolution is monitored by taking closely-spaced snapshots analyzed through the Digital Image Correlation method. We find that the upward propagation of the normal fault can be either accelerated or decelerated depending on the presence of a precut and its orientation. Such precuts can also promote or inhibit the formation of bending-moment faults. These interactions between master fault and precut also affect the shape of the fault-related syncline-anticline pair. |
Appears in Collections: | Article published / in press |
Files in This Item:
File | Description | Size | Format | |
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Bonini&2015_JSG.pdf | accepted paper | 6.18 MB | Adobe PDF | View/Open |
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