利用互相關方法探討大地電場與地震波的耦合行為

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姓名

楊凱傑(Kai-Chieh Yang) 查詢紙本館藏

畢業系所

地球科學學系

論文名稱

利用互相關方法探討大地電場與地震波的耦合行為
(A study on the coupling of geoelectric field and seismic wave by cross-correlation method)

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摘要(中)

近幾年來，由於高品質連續地震資料的增加與電腦計算能力的提升，利用互相關方法從背景噪聲中提取測站間的格林函數在地震學中已被廣泛的使用。本研究即應用此互相關方法分析臺灣大地電場的連續資料，進而從自然電位中提取與地震波傳遞相關的訊號，藉以探討地震波與電場訊號的耦合情形。本研究使用的測站為本團隊在臺灣島內建置的20個大地電場觀測站，取用的資料為水平方向之即時連續訊號，採樣率為15 Hz，時間段的選取從2013年3月到2014年2月，總共一年的資料長度。在前人的研究中從理論推導上已證明電場訊號的傳遞會伴隨著地震波移動，此現象稱為震電響應，而這類同震波傳播的震電現象，卻從未在大尺度的實際觀測資料中被驗證，本研究則為首次實際觀測到此一現象。在此次研究中顯示：利用互相關方法分析自然電位的資料能夠得到近似P波速度傳播的電場異常。以埔里站為虛擬源（近台灣島的中心點），透過震波的速度分析探討中部臺灣下方反射層的震電訊號，顯示高度震電相關的能量大約出現在深度10到60公里，與前人研究中描述關於臺灣山區下方低電阻帶的範圍大致相同，此發現與前人的理論研究中易發生震電耦合的地質環境十分符合。

摘要(英)

Recently, using cross-correlation method to extract Green function between seismic stations from ambient noises has been widely used in seismology owing to the rapid growth of seismic data set and the significant improvement of the computing power. In this study, we apply this method to retrieve seismic related signals from the continuous data of the geoelectric field in Taiwan. Geoelectric signals used are from twenty real-time horizontal self-potential stations with 15 Hz sampling rate during March 2013 to February 2014. According to previous studies, it has been theoretically proved that electric signals can be accompanied with the movement of seismic waves, which is known as “seismoelectric response”. However, those co-seismic wave signals are observed in real data from this study for the first time. As a result, we found that the geoelectric field anomalies are highly related to the P wave propagation and those anomalies are sensitive to the geological structures with the fluid presented, which is also stated by the theoretical calculations from previous studies.

關鍵字(中)

★ 震電響應
★ 互相關方法

關鍵字(英)

★ seismoelectric response
★ cross-correlation method

論文目次

摘要 i
ABSTRACT ii
謝誌 iii
目錄 iv
圖目錄 vi
表目錄 viii
第一章緒論 1
1.1研究動機 1
1.2前人研究 1
1.3本文內容 4
第二章觀測原理與研究方法 9
2.1全島大地電場的連續監測 10
2.1.1自然電位法 10
2.1.2測站架設 14
2.1.3儀器簡介 15
2.2互相關方法 16
第三章資料處理與展示 30
3.1資料比對 30
3.2資料處理 32
第四章結果與討論 41
4.1反射速度分析的原理 41
4.2埔里測站之速度分析 43
4.3理論資料測試與統計測試 50
第五章結論 73
參考文獻 75
附錄A-各測站資料處理的結果 79
附錄B-2013年3月27日和6月2日的電場異常 86

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指導教授

陳建志、郭陳澔(Chien-chih Chen Hao Kuo-Chen)

審核日期

2014-7-31

推文