請用此 Handle URI 來引用此文件: http://hdl.handle.net/11455/10106
標題: P波地震預警模式與系統改良之研究
Development of the Logic and the System of P-wave Earthquake Early Warning
作者: 謝坤城
Hsieh, Kun-Cheng
關鍵字: P波預警
P-wave warning
顯著週期
背景值
predominant period
background values
出版社: 土木工程學系所
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摘要: 台灣位處於環太平洋地震帶上,2011年3月11日,位於日本東北地方太平洋近海強震,其規模高達9.0,雖未對台灣造成立即的危害,但也對生命財產造成威脅。台灣地區自1999年集集地震後曾發生多次6級以上餘震,近期中部地區也發生數次規模6以上之強震;因此,如何能對地震特別是強震進行早期預警有其必要性。而本研究將採用P波顯著週期與背景值異常的概念,對地震早期預警模式進行研究。 本文探討九份二山及台中地區地震預警之問題,先採用Allen&Kanamori (2003)所提出顯著週期,以地震時所首先到達之P波,除了計算3秒顯著週期,並以3秒最大位移應用被背景值異常之概念得出之強度指標K值;以顯著週期與強度指標對S波到達後產生之最大加速度進行回歸,探討出最佳回歸方程式以建立地震預警邏輯。應用所回歸之最佳公式,在S波尚未到達前推估其到達後之地表最大加速,若高於預設門檻值則立即對當地發出警報。而在研究過程中也採用不同濾波方式,對於回歸影響進行分析,當使用低通濾波時對於顯著週期的回歸結果優於高通濾波。 本研究最後也應用最佳回歸之預警邏輯,撰寫Visual Basic 6.0程式,並配合控制電腦、聲光警報器、P波地震感測器建立地震預警系統。並於振動台實際進行測試,測試過程中當P波抵達後僅需0.13秒即可發出警報。因此也期望能將P波地震預警系統應用於降低地震災害之損失。
Taiwan is located in the Pacific Rim seismic belt. Although the scale of 2011 March 11 Tohoku-Pacific Ocean earthquake is up to 9.0, it did not induce serious hazard to Taiwan. Since the 1999 Taiwan Chi-Chi earthquake, it has occurred many aftershocks with scale larger than 6 in the Central Taiwan area. Under this earthquake prone background, it is obvious that the earthquake early warning is essential. This study applies the P-wave predominant period and the background values abnormal model in earthquake early warning research. In this study, the Chiufenershan and Taichung city were adopted for the earthquake early warning development. The P-wave predominant period proposed by Allen & Kanamor(2003), and the background value K, which is defined as the maximum displacement divided by the average displacement, are used to predict to predict analyses the peak ground acceleration of the S-wave. The regression analyses were used to explore the relationships between τ_p-amax and between K-amax, in order to obtain the warning logic. By using the regression equation, we can estimate peak ground acceleration before the arrival of the S-wave. The alarm will be triggered if the amax is higher than the preset threshold value. In addition, different filtering methods were applied in the regression analyses. The results show low-pass filter is better than the high-pass filter. Based on the regression warning logic, a Visual Basic 6.0 program was written and used in the earthquake early warning system. After calibrating in the shanking table, the earthquake early warning system was also tested for the 2013/03/11(ML:6.2) event and the 2013/06/02(ML:6.3). It shows that the system can provide early warning in about 0.13 sec. In addition, the K value logic is more promising than the τ_p logic. However, data from more large scale events are necessary to make the logic and the early warning system more mature
URI: http://hdl.handle.net/11455/10106
其他識別: U0005-2607201311234200
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-2607201311234200
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