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頁籤選單縮合
題 名 | Investigation of a Fault Zone in Urban Environments by Shallow Reflected and Reflected-Converted Waves=以反射波及轉換波探測都市環境中之斷層 |
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作 者 | 鄭懌; 陳光榮; 王者香; | 書刊名 | 中國地質學會會刊 |
卷 期 | 42:1 1999.02[民88.02] |
頁 次 | 頁85-104 |
分類號 | 353.4 |
關鍵詞 | 淺層反射; 斷層; S波; P-SV轉換波; Shallow reflections; Fault; S-wave; P-SV-converted wave; |
語 文 | 英文(English) |
中文摘要 | 本研究以淺層反射波及轉換波測勘位於台北西北區之未定斷層帶。我們以 4.5Hz 自然頻率的三分量受波器記錄反射之 P,P-SV,及 S 波。 剖面長分別為 50m,42m 及 40m 。野外記錄參數特別針對都會區之有限空間而設計。都市繁複的雜訊我們以多重序列濾波成 功地加以抑制。在同一測線上我們分別做出反射及轉換波等三條不同解析度的度測剖面。在 同一反射時間區段可明顯地看出 S 波剖面在西北邊與東南邊有不同的反射特性及頻率, 而 且 S 波的原始資料也可看出繞射的圖像。在速度構造上 S 波和 P-SV 轉換波皆有移位的變 化。因此我們推斷金山斯尼有可能向西南延伸到關渡平原附近而造成許多局部性反傾正斷尼 (antithetic fault),本文之所局面大約有 50。 至 55。 向東南傾斜。 |
英文摘要 | Shallow seismic surveys using reflected and reflectedconverted waves were carried out in an area underlain by several presently unmapped faults in the northwestern district of Taipei metropolis. We used three-component geophonesof 4.5 Hz natural frequency to record P, P-SV, and S-wave reflection data which were 50 m, 42 m and 40 m profiles, respectively. Fieldrecording parameters were planned according to the restricted space of the urban area. Our. data processing demonstrates the advantages of employing filtering techniques in multifold sequences to attenuate complex urban noise. Three seismic profiles of reflected and reflected-converted waves recorded along the same survey line show different lateral and vertical resolutions. Reflection events on the northwest side of our S-wave profile differ in reflection character and frequency from those on the southeast side at the same time interval. Diffraction patterns in the raw S-wave data, together with variations in the velocity structure of S- and P-SV-wave data, suggest that the Chin-Shan fault may extend southwest to the Kuan-Tu plain of the Taipei Basin. The fault that we imaged could be an antithetic fault associated with the master Chin-Shan fault. The fault plane dips about 50 to 55 toward the southeast. |
本系統中英文摘要資訊取自各篇刊載內容。