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研究生: 曾詠棠
論文名稱: 921集集地震前後t*之時空變化研究
指導教授: 陳光榮
學位類別: 碩士
Master
系所名稱: 地球科學系
Department of Earth Sciences
論文出版年: 2002
畢業學年度: 90
語文別: 中文
論文頁數: 50
中文關鍵詞: 衰減
英文關鍵詞: t*
論文種類: 學術論文
相關次數: 點閱:270下載:7
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  • 本研究選取中央氣象局地震觀測網所紀錄921集集地震主震前20個月至主震後3個月內290個地震紀錄,分析主震及餘震區附近(北緯23°至24.5°,東經120°至121°)t*的時空變化。使用單站單相位波譜衰減法擷取P波波相求得觀測t*值。將震源分成三個深度以分析不同深度的路徑之衰減時間項(t*)隨時間變化情形,比較各測站在震前及震後t*平均值變化情形。結果顯示:1從t*分佈發現大區域場址效應可分三區:(1).車籠埔斷層地面破裂帶附近 (2).車籠埔斷層地面破裂帶南方 (3).中央山脈區域(阿里山及玉山測站)。2車籠埔斷層地表破裂帶東南方衰減強度變化較大。3影響車籠埔斷層地表破裂帶北方衰減強度變化的異常體約在5~10km深,向南異常體逐漸深入10~15km。4車籠隆埔斷層地表破裂帶南端及北端測站,在主震前一年,有t*的異常增高現象。

    誌謝 摘要 ‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧1 圖目與表目‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧3 第一章 緒論 ‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧5 第二章 研究方法 ‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧9 第三章 資料處理 ‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧12 3-1 前言 ‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧ 12 3-2 地震資料選取 ‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧ 12 3-3 t*值計算‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧ ‧‧‧‧14 3-4 資料分析 ‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧ ‧‧‧‧21 第四章 結果與討論‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧24 第五章 結論 ‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧47 參考文獻 ‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧48

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