由於台灣處於活躍的歐亞大陸板塊與菲律賓海板塊之間，地震十分頻繁，所以地震的相關研究也相對重要，於是政府在台灣各地陸續設置各種類的地震測量儀器，隨著儀器測量精度的提升與演算方法的改進，目前已有儀器可達到公分級的量測精度，因此可以更仔細的觀察、分析地震行為。
本研究主要使用氣象局所設置的全球定位系統(GPS)站與地震儀，加速度儀早已被廣泛使用在各領域，而由於近年來演算法的改進，目前GPS所呈現的速度解及位置解也有公分級的精度，所以可將兩者運算出的位置解與速度解加以分析及整合。因兩儀器必定會在同時間量測到同一個地震，於是將地震儀積分出來的位置解與速度解以及GPS使用最小平方法求出的位置解與都卜勒速度解互相比較，但兩儀器不會在相同地點且時間軸上也無法確定是否相同，所以藉由兩儀器量測地震的結果來檢查兩者時間軸上是否相異。研究中以2009/10/03花蓮地震、2009/11/05南投地震與2009/12/19花蓮地震為例子，證明已可由2公分左右的位移量與每秒2公分以上的速度變化量觀察到兩儀器間毫秒的時間差異。

Taiwan is between the Eurasian plate and the Philippine plate, so many earthquakes occurred. Consequently, the research on earthquake dynamics becomes important. The government of Taiwan has installed many instruments for measuring earthquakes everywhere in Taiwan. Nowadays, the accuracy of several centimeters in surface displacement can be reached, so that the earthquake dynamic response can be observed in detail.
This study particularly analyzes and combines the earthquake-affected data from GPS receivers and seismometers that are set up by Central Weather Bureau (CWB). Seismometers have been used to detect the surface motions by earthquakes so many years, so their accuracy is dependable. On the other hand, the velocity and position solutions from GPS have been significantly improved in recent years. And these two instruments certainly sense the dynamic behavior from the same earthquake at the same time. As a result, the difference between them can be studied. For example, whether the difference of their time exists or not can be found by comparing their position and velocity solutions. The results from three studied earthquake cases have proved that the time difference in millisecond can be obtained. In addition, the accuracy of two centimeters in surface displacement and of two centimeters per second in plane speed can be observed by GPS.

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