Constraints on fault and lithosphere rheology from the coseismic slip and postseismic afterslip of the 2006 Mw7.0 Mozambique earthquake

摘要: The 2006 M_w 7.0 Mozambique (Machaze) normal-faulting earthquake ruptured an unusually steeply dipping fault plane (~75°). amount of slip in the decreased from depths ~10 km toward surface, and this shallow deficit was at least partly recovered by postseismic afterslip on part plane. An adjacent normal segment slipped postseismically (and possibly also co-seismically) with a large strike-slip component, response to stresses generated main Our observations suggest that zone behaves stick-slip manner crystalline basement, where it cuts sedimentary layer coseismic rupture partially arrested there significant creep. We discuss effects such behavior large-scale tectonics continental regions, assessment seismic hazard similar systems. steep dip suggests re-activation preexisting structure coefficient friction ~25–45% lower than optimally oriented planes, analysis deformation following aftershock indicates value parameter ‘a’ describes rate-dependence lies range 1 × 10^(−3)–2 10^(−2). lack long-wavelength relaxation viscosities ductile lithosphere greater ~2 10^(19) Pa s, examination tectonic geomorphology region identifies ways which systems can be identified before they future earthquakes.