世界上有許多國家，曾經遭受許多災害性地震的破壞，例如台灣、日本、墨西哥以及美國南加州地區。地震預警系統(Earthquake Early Warning System, EEWS)是個有效的方法來應用在減輕地震帶來的災害。在現地型地震預警的發展中，需要許多嚴苛的要求下才可以準確地執行，例如：需要能快速地估算地震帶來的災害潛勢以及僅利用單測站預估準確的地震規模大小。
在日本地區，經歷許多年的建設，目前具有許多數量的地震測站，測站架設位置分佈全日本，而其中最特別的是井下地震儀觀測網，目前測站密度已經涵蓋全日本；在台灣地區目前已經有47個井下地震儀測站，逐年增加數量當中。在本研究中，我們選用日本Kiban Kyoshin network(KiK-net)觀測網，利用良好的測站密度分布，所得取之地震紀錄進行研究；另外，在台灣我們選用中央氣象局井下地震觀測網之測站用於本研究。利用KiK-net測站從1998年至2012年，位於日本內陸以及沿海地區，MJMA 5.0至7.3，震源深度小於50公里，共123個地震事件；我們也利用台灣中央氣象局井下地震觀測網，選用位於台灣內陸及沿海地區，芮氏規模4.0至6.5，震源深度小於50公里，共189個地震事件。在日本地區研究成果，我們提出τc*Pd是一項新的預估規模的方式，且此預估規模與地震災害潛勢更有相關性；τc*Pd可以作為一項門檻值，來判定此地震是否具有危害性。在台灣地區研究成果，我們提出適用於井下觀測網之Pd衰減經驗公式，在目前儀器架設情況下，能提出的預估規模，與確切值誤差範圍於0.22個規模單位。

This study is the first application of borehole seismograph in earthquake early warning. In Japan, borehole seismometers have been established around whole Japan region. There are 47 borehole seismometers which have been established in Taiwan, and the number of them is getting more by years. We study the application of τc*Pd method in Japan and MPd method in Taiwan. The new type of earthquake size determined by τc*Pd is more related to the damage potential. We find that τc*Pd provides another parameter to measure the size of earthquake and the threshold to warn strong ground motion. In Taiwan, we find that a new regression equation of Pd for CWB borehole seismometers network. According to the new regression equation, the standard deviation of MPd is about 0.22 when more than 5 stations near the focal are used.

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