A horizontal ground‐motion model for crustal and subduction earthquakes in Taiwan

Abstract

In this study, a new horizontal ground‐motion model is developed for crustal and subduction earthquakes in Taiwan. A novel two‐step maximum‐likelihood method is used as a regression tool to develop this model. This method simultaneously considers both the correlation between records and the biased sampling because of random truncation. Moreover, additional ground‐motion data can be considered to derive more reliable analysis results. The functional form of the proposed ground‐motion model is constructed using the response spectrum of the reference ground‐motion scenario and different scalings of the source, path, and site to illustrate the ground‐motion characteristics. The variabilities in the ground‐motion intensity that result from different events, stations, and records are developed individually to derive a single‐station sigma. The proposed ground‐motion model may be useful for predicting ground‐motion intensity and performing site‐specific probabilistic seismic hazard analysis in Taiwan.