頁籤選單縮合
題 名 | 即時加速度型地震觀測網之波相到時自動撿拾系統=An Automatic Phase Picker of the Real-Time Acceleration Seismic Network |
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作 者 | 吳逸民; 陳承俊; 鍾仁光; 辛在勤; | 書刊名 | 氣象學報 |
卷 期 | 42:2 1998.06[民87.06] |
頁 次 | 頁103-117 |
分類號 | 351.249232 |
關鍵詞 | 波相到時自動撿拾; 測站分布空餘夾角; 地震自動定位及即時加速度型地震觀測網; Automatic phase picking; GAP; Automatic earthquake location and real-time acceleration seismic network; |
語 文 | 中文(Chinese) |
中文摘要 | 本文以 STA/LTA 波相到時自動撿拾之技術應用在加速度型地震資料,分析了 85 個地震共 1728 筆加速度資料。 其中以人工撿拾的 P 波中約有 49 %可以由電腦自動撿拾 出來,S 波的自動撿拾率則只有 21 %。 自動與人工撿拾的時間差,P 波一般約在± 0.25 秒的範圍, 而 S 波則在± 0.5 秒以內。 自動定位及人工定位在深度上的平均差異為 4.2 公里,震央的平均差異為 6.5 公里。 自動及人工定位所產生的震源差異與測站分布空餘夾 角( GAP )呈指數型態的正相關, 然而 GAP 小於 200 度時差異可控制在 15 公里以下。 淺部地殼的構造複雜是造成淺源地震有較大的震源深度差異的原因。 |
英文摘要 | Based on the conventional STA/LTA algorithm, the automatic phase picking technique was examined on the accelerograms in this study. We investigated 1728 accelerograms from eighty-five earthquakes that occurred during 1995 and 1996. About half of the P-phases picked manually could be picked by the programming procedure, while smaller part of S-phases is picked automatically. The time differences of phases arrivals determined from automatic picking and manual picking were within ± 0.25 sec for the P-phases, and ± 0.5 sec for the S-phases. The average depth difference between automatic and manual-location is 4.2 km, while the average epicenter difference is 6.5 km. The hypocenter difference between automatic and manual-location expresses approximately an exponential relationship with the gap of the station distribution. When the gap is less than 200 degrees, the hypocenter difference can be reduced to less than 15 km. In general, the depth difference is large when the earthquakes occurred in the very shallow layer. It may have connection with the shallower crust structure that is more complex than the deeper one. |
本系統中英文摘要資訊取自各篇刊載內容。