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頁籤選單縮合
題名 | Numerical Simulation of Neotectonics Near Peikang High=北港基盤高區附近新構造運動之數值模擬 |
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作者 | 鄭富書; 蕭銘璽; 盧佳遇; | 書刊名 | 中國地質學會會刊 |
卷期 | 39:4 1996.10[民85.10] |
頁次 | 頁557-578 |
分類號 | 356.232 |
關鍵詞 | 新構造運動; 數值模擬; 基盤高區; Neotectonics; Numerical simulation; Basement high; |
語文 | 英文(English) |
中文摘要 | 新構造運動在北港基盤高區附近可能造成一系列之現象,包括:逆衝斷層及橫移 斷層等地質構造、微地震及板塊運動在北港基盤高區之前沿受阻等現象。本文利用有限元素 法模擬北港高區附近之新構造運動;為了合理模擬真實之情況,本文採用界面元素、無限元 素及危險性衡量等數值方法以模擬地層之界面、施加合理之邊界條件、減少元素數目及判識 斷層可能發生之區域。 模擬之結果並與北港基盤高區之一系列現象,諸如微地震、地質構造及斷層組態、全球衛星 定位系統所量測之位移場,進行比對。模擬結果顯示在北港基盤高區南沿累積之應變能量較 其他區域為大;此結果對北港高區南沿有較多之微地震之現象,提供一可能之解釋。模擬之 位移場與全球衛星定位系統所量測之位移場大致吻合,並顯示在北港高區前沿有產生橫移斷 層之可能,此亦與現地之地質構造吻合。根據垂直面模擬結果,在北港高區前沿接近梨山斷 層處可能產生低角度之逆衝斷層,此與現地之情況相同。 本文並探討北港基盤高區與相鄰西部麓山帶之界面摩擦效應。結果顯示,界面摩擦角之增加 將會導致應變能分散至較廣大之區域,並推估在二維分析下之摩擦角約為 10 至 20 度。同 時,本文亦探討北港基盤高區與西部麓山帶之相對勁度效應,反推出北港基盤高區應較西部 麓山帶為堅硬,此與震測所得相吻合。 |
英文摘要 | Neotectonic deformation near the Peikang basement high induces a sequence of phenomena, such as the development of faults, the occurrence of earthquakes and the detainment of displacement of the Western Foothills near the boundary of the Peikang high. In this paper, the neotectonic deformation near the Peikang high was simulated using a finite element computer code, ABAQUS. Infinite elements, interface elements and a measure of failure possibility were adopted to provide improvements in modeling the interfaces of the geological strata, reducing the number of elements, providing adequate boundary conditions and evaluating the possibility of faulting. The simulated results were then compared to the existing phoenomena including the occurrences of micro-earthquakes, configuration of faults and displacement field measured by the Global Positioning System (GPS). The simulated results indicate that the induced strain energy is greater in the southern region than in the northern region, which explains why there are more earthquakes in the southern region. The simulated displacement field agrees with GPS records and reveals the occurrence of right and left lateral faults. Based on the simulation of vertical plane deformation, the location of thrust faults would occur at the rear of the up-thrusting block, which is consistent with field observations. The frictional effect of interfaces between the two main geological units (the Peikang high and the Western Foothills) was also evaluated. The results indicate that the increase in friction disperses the strain energy to a larger region, and the best fit of the friction angle is estimated to be about 10 to 20 degrees. Furthermore, the effect of relative stiffness was studied. |
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