Mechanical origin of power law scaling in fault zone rock | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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  Mechanical origin of power law scaling in fault zone rock

Type de publication:

Journal Article

Source:

Geophysical Research Letters, Volume 34, Ticket 4 (2007)

ISBN:

0094-8276

URL:

http://www.agu.org/

Mots-clés:

Tectonique ; SAN-ANDREAS SYSTEM; PUNCHBOWL FAULT; CALIFORNIA; GOUGE, UMR 7154

Résumé:

A nearest neighbor fragmentation model, previously developed to explain observations of power law particle distributions in 3D with mass dimension D-3 approximate to 2.6 (D-2 approximate to 2.6 in 2D section) in low-strain fault gouge and breccia, is extended to the case of large strains to explain recent observations of D-3 approximate to 3.0 (D-2 approximate to 2.0 in 2D section) in the highly strained cores of many exhumed fault zones. At low strains, the elimination of same-sized nearest neighbors has been shown to produce a power law distribution which is characterized by a mass dimension near D-3 approximate to 2.6. With increasing shear strain these isolated same-size neighbors can collide, in which case one of them fractures. The probability of two same size neighbors colliding and fragmenting in a simple shear flow is a function of the size and density of the two particles. Only for a power law distribution with D-3 = 3.0 is this collision probability independent of the size of the particles.

Notes:

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