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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:陳光榮陳光榮引用關係
學位類別:碩士
校院名稱:國立臺灣師範大學
系所名稱:地球科學研究所
學門:自然科學學門
學類:地球科學學類
論文種類:學術論文
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
外文關鍵詞:t*
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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
參考文獻
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