壽豐EDM觀測網應用於花蓮地區之地殼變動及地震預測研究(6)

An Application of Shou-Feng EDM Network for the Study of Crustal Motion in Hualien District to the Earthquake Prediction Research (6)

許華杞(H. C. Sheu) ； 林玉峰(Y. F. Lin) ； 江文卿(W. C. Jiang) ； 劉政(C. Liu) ； 恒石幸正(Y. K. Tsuneishi)

《地圖 ： 中華民國地圖學會會刊》 8期 (1997/12) Pp. 295-304

https://doi.org/10.30006/JC.199712.0024

摘要

花蓮壽豐觀測網設置至今已有六年，分析觀測成果發現在花蓮地區發生中度規模地震之前地殼變動有明顯的變化。從1994年底到1996年底台灣東部之地震頻率特別高，在花蓮附近曾發生三次規模5.7-5.8之淺層地震。在地震發生約兩個月前開始，壽豐觀測網之海岸山脈各測線均縮短，其線應變量急速增加1.5-2PPM，而用曲線描繪法分析應變量結果發現曲線也相對加速彎曲，此種現象可視為地震之前兆。持續觀測網之觀測以累積及瞭解更多之線應變量變化與地震的關係，期望能有助於將來本地區之地震預測研究。

關鍵字

地震預測 ； 地殼變動

並列摘要

It has been six years since the monitoring network for crustal motion was established in Shou-Feng, Hualien. It is composed of six baselines whose lengths are measured by EDM at regular interval of every two days. The results of observation have revealed the remarkable crustal motions in this area which occur before earthquakes. The frequency of the earthquake in the period of 1994-1996 was extremely high including three shallow earthquakes of the magnitude 5.7-5.8. About two months before these each earthquake, the baselines in the coastal mountains of this network shortened in rather short period and the corresponding strain increased by 1.5-2 PPM. According to the curve fitting to the diagram for this variation, the accelerations of the variation were rapid. These changes in baseline length can be good indicator of earthquakes and the study on the relationship between this phenomena and earthquake will increase our understanding on the earthquake itself. I hope it will contribute to the earthquake prediction.

並列關鍵字

Earthquake Predication ； Crustal Motion

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