頁籤選單縮合
題 名 | 2004年臺灣地區地震震源參數=The Focal Mechanisms of Taiwan Regional Earthquakes in 2004 |
---|---|
作 者 | 陳榮裕; 張建興; 甘志文; 吳逸民; 辛在勤; | 書刊名 | 氣象學報 |
卷 期 | 48:2 2010.09[民99.09] |
頁 次 | 頁13-39 |
分類號 | 351.249232 |
關鍵詞 | 基因演算法; 震源機制解; 中央地震矩張量; Genetic algorithm; Focal mechanism; Centroid moment tensor; |
語 文 | 中文(Chinese) |
中文摘要 | 本文發表2004年台灣地區中等規模以上地震之震源機制解,包括P波初動震源機制解及中央地震矩張量逆推(Centroid Moment Tensor inversion,CMT)震源機制解兩種。我們總共得到102個地震的P波初動震源機制解。此種震源機制解是經由基因演算法(Wu et al., 2008)以非線性總體搜尋求得。CMT震源機制解是經由改良之中央地震矩張量逆推演算法(Kao et al., 1998a),加上本文提出的藉由地震觀測站與震央間之方位角覆蓋率,自動產生CMT逆推測站之權重(Weighting)來求得。此方法克服台灣地區高背景雜訊及複雜板塊構造所造成之非均向性速度構造等因素之影響。我們總共得到104個地震的CMT震源機制解。為了使本研究結果能夠容易理解及學術上廣為使用,其彙整後之地震震源參數結果表格及完整逆推結果之電子檔案均放置於中央氣象局寬頻資訊網頁http://cwbsnbb.cwb.gov.tw內提供查詢。希望在此網頁中建立台灣地區地震震源機制資料庫,提供台灣地區地震孕震構造及板塊構造研究之用。 |
英文摘要 | We determine the focal mechanism solution to earthquakes of medium and above magnitude that occurred in the Taiwan region in 2004. Both first motion and Centroid Moment Tensor (CMT) inversion solutions are collected in this study. There are 102 events of focal mechanism solution from firstmotion by genetic algorithm (Wu et al., 2008), a nonlinear global search for the focalmechanism solutions. And we use an improved algorithm of CMT by Kao et al. (1998a) to overcome the generally higher background noise as well as the heterogeneous velocity structure resulted from the complex tectonic interactions near Taiwan. In addition, the weighting of stations produced automatically by the azimuth coverage from the recorder and epicenter is used in our routine CMT inversion. There are 104 events of solutions obtained by CMT inversion in 2004. All the results are displayed and can be searched on web site http://cwbsnbb.cwb.gov.tw. Our study provides a database of focal mechanisms for studying seismogenic structures and plate tectonics. |
本系統中英文摘要資訊取自各篇刊載內容。