發(fā)布時間：2019-05-08 08:13

【摘要】：本論文選取銀川地塹中銀川和蘆花臺兩條隱伏斷層為研究對象。在以銀川隱伏斷層為例論述了隱伏斷層探測的基本思路、原則、方法和步驟的基礎(chǔ)上,著重以蘆花臺隱伏斷層為例,探討隱伏活動斷層精定位技術(shù)以及計算機(jī)制圖方法。對蘆花臺隱伏斷層實施了淺層地震勘探,查明其總體走向為NNE,傾向為SEE,傾角為73~78°。根據(jù)取自鉆孔的地層樣品沉積年齡測定,又將主斷層分為南段和北段。南段的活動時代為中更新世,而北段的活動時代為全新世。通過對淺層地震勘探斷層上斷點向上延伸計算,使其與鉆探得到的斷層上斷點埋深相匹配。通過斷層的精確定位,得到了蘆花臺隱伏斷層在淺表的幾何分布、產(chǎn)狀及活動性分段特征的認(rèn)識。在蘆花臺隱伏段層精定位基礎(chǔ)上,根據(jù)上延計算結(jié)果、探測誤差、地震現(xiàn)場考察結(jié)果計算出蘆花臺隱伏斷層全新世活動段避讓帶寬度為:87-98m。根據(jù)避讓帶寬度值,利用Arc GIS緩沖區(qū)研究方法繪制出了避讓帶范圍。所得成果為石嘴山市城市轄區(qū)內(nèi)的建設(shè)提供了重要參考依據(jù)。最后以蘆花臺隱伏斷層為例闡述了利用GIS技術(shù)處理探測資料,繪制成果圖件的方法。本論文研究中使用Arc GIS軟件繪制完成了1:250 000工作區(qū)地震構(gòu)造圖、石嘴山目標(biāo)區(qū)1:50 000活動斷層分布圖、1:50 000蘆花臺隱伏斷層實際材料圖、1:10 000蘆花臺隱伏活動斷層帶狀分布圖和1:10 000蘆花臺隱伏活動斷層避讓帶分布圖,這些圖件最終以五個制圖文檔(mxd文件)和一個空間數(shù)據(jù)庫存儲。
[Abstract]:In this paper, two hidden faults, Yinchuan and Luhuatai, in Yinchuan graben are selected as research objects. Taking Yinchuan hidden fault as an example, the basic ideas, principles, methods and steps of hidden fault detection are discussed. Taking Luhuatai hidden fault as an example, the fine location technique of concealed active fault and the computer mapping method are discussed. The shallow seismic exploration of Luhuatai concealed fault has been carried out. It is found that the general strike of the fault is NNE, inclined to SEE, dip angle of 73 擄to 78 擄. The main fault is divided into the south and north segments according to the sedimentary age of the strata samples taken from the borehole. The activity age of the southern segment is Middle Pleistocene, while the activity age of the northern segment is Holocene. By calculating the upward extension of the fault break point in shallow seismic exploration, it matches the buried depth of the fault break point obtained by drilling. Based on the accurate location of faults, the geometric distribution, occurrence and active segmented characteristics of Luhuatai concealed fault are obtained. Based on the precise location of the hidden section of Luhuatai station, according to the results of up-extending calculation, the detection error and the results of seismic field investigation, the width of the avoidance zone of the Holocene active segment of the Luhuatai hidden fault is calculated as follows: 87? 98m. According to the value of the avoiding bandwidth, the range of the avoiding band is drawn by using the Arc GIS buffer research method. The results provide an important reference for the construction of Shizuishan city area. Finally, taking Luhuatai hidden fault as an example, this paper expounds the method of processing exploration data and drawing achievement map by using GIS technology. In this paper, the Arc GIS software is used to draw the seismotectonic map of 1 ~ 250,000 working area, 1:50 active fault distribution map of Shizuishan target area and 1:50 actual material map of Luhuatai hidden fault. The 1:10 map of the hidden active fault banded distribution at the Luhua platform and the 1:10 distribution map of the concealed active fault avoidance zone at the Luhua platform were eventually stored in five cartographic documents (mxd files) and a spatial database.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P315.6

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本文編號：2471746