Exciting news! We're transitioning to the Statewide California Earthquake Center. Our new website is under construction, but we'll continue using this website for SCEC business in the meantime. We're also archiving the Southern Center site to preserve its rich history. A new and improved platform is coming soon!

Multicomponent C3 Green’s Functions for Improved Long‐Period Ground‐Motion Prediction

Yixiao Sheng, Marine A. Denolle, & Gregory C. Beroza

Published September 26, 2017, SCEC Contribution #7365

The virtual earthquake approach to ground motion prediction uses Green’s functions determined from the ambient seismic field to predict long-period shaking from scenario earthquakes. The method requires accurate relative Green’s function amplitudes between stations and among components; however, the amplitudes of ambient-field Green’s functions are known to be subject to biases from uneven source distribution. We show that multi-component, higher order cross-correlations are significantly less biased than the conventional first-order cross-correlation, and we demonstrate that they provide a more reliable prediction of observed ground motion amplitudes for a recent moderate earthquake on the San Jacinto Fault in southern California.

Sheng, Y., Denolle, M. A., & Beroza, G. C. (2017). Multicomponent C3 Green’s Functions for Improved Long‐Period Ground‐Motion Prediction. Bulletin of the Seismological Society of America, 107(6), 2836-2845. doi: 10.1785/0120170053.