A Model for the High-Cut Process of Strong-Motion Accelerations in Terms of Distance, Magnitude, and Site Condition: An Example from the SMART 1 Array, Lotung, Taiwan

Parameters controlling the high-cut process of strong-motion accelerations are analyzed using the recordings collected from the SMART 1 array in Lotung, Taiwan. A regression model in terms of distance, earthquake magnitude, and site condition is generally found to be suitable to describe the parameters under investigation. Results show that the high-cut process is controlled by both the site and source effects, which might bring resolution to the long-standing controversy over the origin of the cutoff frequency. In this note, it becomes almost certain that distance is the least significant parameter controlling the high-cut process.