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- W1562679601 abstract "We have analyzed a class of rupture models with spontaneous rupture growth and spatially variable stress and strength using a computationally rapid solution of the 3-D boundary integral equation for dynamic rupture on a planar fault. The distributions of initial stress and strength are assumed to be self-similar; their spectral variation is assumed to be inversely proportional to wavenumber raised to three-halves power. The initial stress and strength are weakly correlated. The ruptures are confined by a fixed (i.e., high-strength) rupture perimeter. This unphysical confinement allows both an optimal use of the limited computational duration of the model and direct comparison with results obtained from kinematic models. The significant parameters of the dynamic models are the rms normalized strength, 〈S〉, and the relative variation of the initial stress and strength. The average rupture velocity is controlled by the normalized strength; to distinguish ruptures with transonic and subsonic rupture velocities, we consider 〈S〉 = 1.0 and 1.5, respectively. The complexity of the rupture process is proportional to the variation of the initial stress and strength. In general, the complex ruptures exhibit significant variations of rupture velocity, and the rupture fronts are irregular in shape. The body-waves radiated by these models are calculated from the far-field terms of the Green's function. The radiated energy flux is calculated by integrating the velocity power spectrum. These integrals and the body-wave acceleration spectra are averaged over the focal sphere. For these confined ruptures, the radiation efficiency and the rms S-wave spectrum depend on the average rupture velocity but do not depend on the complexity of the rupture process. As the ruptures become more complex, the amplitude of the stopping phases decreases while the number of phases radiated from the interior of the rupture area increases. The ruptures with transonic rupture velocities radiate more energy than the subsonic ruptures." @default.
- W1562679601 created "2016-06-24" @default.
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- W1562679601 date "2013-03-18" @default.
- W1562679601 modified "2023-09-27" @default.
- W1562679601 title "The Seismic Radiation from a 3-D Dynamic Model of a Complex Rupture Process. Part I: Confined Ruptures" @default.
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- W1562679601 doi "https://doi.org/10.1029/gm037p0097" @default.
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