Building Objective 3D Fault Representations in Active Tectonic Settings

Publication type

Journal Article

Research Area

Tectonics

Research Team

Structural Geology

Abstract

Developing 3D representations of active faults is an important step to improve seismic-hazard assessment. However, the geometries of faults can be difficult to constrain at depth, and building representations is often subjective. We present a new objective workflow to build 3D fault geometries from surface and subsurface data that are generally available in active tectonic environments. We use surface traces, focal mechanism orientations, and relocated hypocenters as geological constraints in an implicit modeling approach. This method enables us to control the weights assigned to the different constraints, increasing the accuracy of the fault model. We evaluate and refine our method by applying it to a well-known natural case study: the Puente Hills thrust fault, a blind thrust beneath Los Angeles, California, that is imaged by high-quality seismic reflection data and that generated the 1987 M-w 6.0 Whittier Narrows earthquake. Then, we apply our new workflow to the Xianshuihe-Anninghe left-lateral strike-slip fault systems, China. Implementing this workflow allows for the development of improved fault surface representations that can contribute to Community Fault Models and support fault system modeling, rupture simulations, and regional hazard assessments.

Publication Details

Journal

Seismological Research Letters

Volume

88

Issue

3

Pagination

831-839

Date Published

05/2017

Identifiers

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