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:295 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。
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