Mach wave properties in the presence of source and medium heterogeneity

Jagdish Chandra Vyas, Paul Martin Mai, Martin Galis, Eric M Dunham, W Imperatori

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11 Scopus citations


We investigate Mach wave coherence for kinematic supershear ruptures with spatially heterogeneous source parameters, embedded in 3-D scattering media. We assess Mach wave coherence considering: (1) source heterogeneities in terms of variations in slip, rise time and rupture speed; (2) small-scale heterogeneities in Earth structure, parametrized from combinations of three correlation lengths and two standard deviations (assuming von Karman power spectral density with fixed Hurst exponent); and (3) joint effects of source and medium heterogeneities. Ground-motion simulations are conducted using a generalized finite-difference method, choosing a parametrization such that the highest resolved frequency is ~5 Hz. We discover that Mach wave coherence is slightly diminished at near-fault distances (
Original languageEnglish (US)
Pages (from-to)2035-2052
Number of pages18
JournalGeophysical Journal International
Issue number3
StatePublished - Jun 8 2018

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): BAS/1/1339-01-01, AEA-7000000083
Acknowledgements: We thank the editor Jean Virieux and the two anonymous reviewers for their constructive critical review that helped us to improve the manuscript. The research presented in this paper is supported by King Abdullah University of Science and Technology (KAUST) in Thuwal, Saudi Arabia, grants BAS/1/1339-01-01 and AEA- 7000000083. Earthquake rupture and ground-motion simulations have been carried out using the KAUST Supercomputing Laboratory (KSL), and we acknowledge the support of the KSL staff. WI was supported through a contract with the Swiss Federal Nuclear Safety Inspectorate (ENSI).


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