Abstract

Complex earthquake rupture processes can affect ground‐motion characteristics significantly, particularly in the near‐source region for large events. Correlations between earthquake source parameters are efficient metrics in quantifying earthquake source characteristics and consequently in understanding the effect of the earthquake source on ground‐motion characteristics. I investigate the effect of fracture energy on source correlation statistics by performing a set of spontaneous dynamic rupture model simulations, each with a different strategy in generating input fracture energy distributions. I find that source parameter correlation structures can be significantly affected by the input fracture energy distribution because it plays an important role in controlling the temporal evolution of the rupture process. This study implies that it is important to stably constrain the fracture energy by observational data, or at least to test a wide range of possibilities in generating fracture energy distributions in dynamic rupture modeling for source correlation studies.

Online Material: Figures showing distributions of input dynamic parameters for positive and negative correlations.

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