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DTSTART:20251228T110000
DTEND:20251228T120000
SUMMARY:Slip pulse earthquakes
DESCRIPTION:<p>A prominent mode of large earthquakes is self-healing slip pulses, which feature a finite slipping length. The latter implies that the rise time of the displacement waveforms of such earthquakes is significantly shorter than the source duration, in contrast to expanding crack-like earthquakes. The slipping length emerges from an interplay between leading-edge contact breakage and trailing-edge re-strengthening (healing), which is intrinsically related to the generic frictional rate and state dependence of faults. Our understanding of slip pulse earthquakes lags behind that of their crack-like counterparts. We show that steady-state slip pulses are intrinsically unstable, yet that the spatiotemporal dynamics of unsteady slip pulses are surprisingly and fundamentally related to the corresponding steady-state family of solutions, leading to a reduced-dimensionality description. We further show that the development of instability of growing pulses is slow, explaining their emergence in natural and manmade frictional systems. The theory culminates in an equation of motion for unsteady slip pulses, and is discussed in relation to large-scale numerical simulations, laboratory earthquakes and geophysical observations.</p>
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TRANSP:OPAQUE
URL:https://www.weizmann.ac.il/EPS/events
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