Much remains to be done, then, but we anticipate that the same results will be generated by the HHT method to improve the resolution of the time and frequency domains.

• 而本篇文章则是利用时频分析技术，以共振主频随时间之变化来探讨局部地区土层之场址效应，尤其是强震与弱震间土壤共振主频之差异。