Mach wave properties in the presence of source and medium heterogeneity

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

Research output: Contribution to journalArticlepeer-review

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


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