Thingbaijam, K.K.S.; Van Dissen, R.J.; Shaw, B.E.; Gerstenberger, M.C. 2022 Average coseismic slip profiles. Lower Hutt, N.Z.: GNS Science. GNS Science report 2021/24. 33 p.; doi: 10.21420/S6ED-JN06
Abstract:
Despite the potential impact on earthquake rupture forecasts for seismic hazard analysis, derivation of applicable average coseismic slip profiles has received relatively limited attention. Here, we present improved insight using a set of rupture models of past earthquakes. We find that along-strike slip profiles are well approximated by a power-of-sine function with index = 1/2 (i.e. sinesqrt function), corroborating Biasi and Weldon (2006). However, elongated ruptures (with aspect ratios >5.0) have a flatter profile. Additionally, down-dip profiles for buried ruptures conform to the sinesqrt function, whereas those for surface rupture events have lesser tapering at the upper fault edge. These findings agree with those obtained from analysis of simulated quasi-dynamic rupture models. Further, we demonstrate that the present findings are also consistent with characterisation of slip heterogeneity through a random field model of slip.
