【摘要】：本文選取了云南省境內(nèi)共50個臺站記錄到的159個遠(yuǎn)震事件作為研究對象,涵蓋經(jīng)緯度范圍在97。E-107。E與21。N-29。N之間。首先計(jì)算每個臺站各個事件的單條P波接收函數(shù),經(jīng)挑選后的有效接收函數(shù)共2211個,接著選取簡單初始模型進(jìn)行二重反演獲得單個事件速度結(jié)構(gòu),而后對同一個臺站的多個速度結(jié)構(gòu)進(jìn)行bootstrap重采樣統(tǒng)計(jì),獲得該臺站下方物質(zhì)分布最可能的精細(xì)速度結(jié)構(gòu)。根據(jù)計(jì)算結(jié)果統(tǒng)計(jì)Moho面埋深情況、低速區(qū)存在位置與地下物質(zhì)S波的整體分布規(guī)律并繪制相應(yīng)圖表。綜合各個臺站結(jié)果進(jìn)行區(qū)域性分析討論,從而了解研究區(qū)范圍內(nèi)物質(zhì)分布規(guī)律與地質(zhì)構(gòu)造間活動情況,并推測云南省的地殼分布結(jié)構(gòu)、川滇地區(qū)板塊內(nèi)部以及板塊之間活動的動力學(xué)機(jī)制。 研究結(jié)果主要有： 1、通過理論數(shù)值模擬實(shí)驗(yàn)與實(shí)測數(shù)據(jù)計(jì)算,論證了用bootstrap方法統(tǒng)計(jì)各事件結(jié)果最終獲得臺站下方精細(xì)速度結(jié)構(gòu)是可行的,它比起疊加接收函數(shù)再進(jìn)行反演要更加可靠。同時(shí)通過選取2次模型反演不同高斯參數(shù)下的接收函數(shù),能夠降低結(jié)果對初始模型的依賴。 2、研究區(qū)內(nèi)地殼厚度在北偏西向逐漸增加,橫向變化幅度可達(dá)30-40km,高原存在抬升隆起現(xiàn)象。在滇中塊體附近等值線存在3個明顯的舌狀突出,Moho面埋深的變化幅度在各個方向上不均勻：其他區(qū)域內(nèi)等值線呈均勻的遞增趨勢。 3、研究區(qū)地下2km深度范圍內(nèi)廣泛分布著沉積層,之后S波速度躍變到3.0km/s以上。部分臺站下方存在低速結(jié)構(gòu),這些臺站多分布在深大斷裂附近,火山活動區(qū)以及滇中塊體內(nèi)部。而在其他巖石圈較為穩(wěn)固的地區(qū)如四川盆地邊緣、保山塊體與蘭坪—思茅塊體附近基本沒有低速結(jié)構(gòu)存在。 4、根據(jù)計(jì)算結(jié)果,本文的結(jié)論支持青藏高原下地殼物質(zhì)流的運(yùn)動模式。即：青藏高原下地殼物質(zhì)被擠出后受到四川盆地與喜馬拉雅構(gòu)造結(jié)的限制,主要沿著深大斷裂流入云南境內(nèi),并且物質(zhì)流突破了麗江斷裂,侵入到滇中塊體并在塊體內(nèi)部集中分布。
[Abstract]:In this paper, 159 teleseismic events recorded by 50 stations in Yunnan Province are selected as research objects, covering the range of longitude and latitude between 97.E-107.E and 21.N-29.N. First of all, the single P-wave reception function of each station is calculated, and the selected effective reception function is 221, and then the single event velocity structure is obtained by double inversion with a simple initial model. Then the bootstrap resampling statistics of multiple velocity structures of the same station are carried out to obtain the most probable fine velocity structure of the material distribution under the station. According to the statistical results of the Moho surface buried depth, the location of the low velocity region and the overall distribution of the S wave of underground matter are calculated and the corresponding charts are drawn. Based on the regional analysis and discussion of the results of each station, the distribution law of matter and the activities between geological structures in the study area are understood, and the crustal distribution structure of Yunnan Province is inferred. The dynamic mechanism of intraplate and inter-plate activity in Sichuan-Yunnan area. The main results are as follows: 1. Through the theoretical numerical simulation experiment and the calculation of the measured data, it is proved that it is feasible to obtain the fine velocity structure under the station by using the bootstrap method to calculate the results of each event. It is more reliable than superposition receiving function to perform inversion. At the same time, by selecting two models to invert the reception function under different Gao Si parameters, the dependence of the results on the initial model can be reduced. The crustal thickness in the study area increases gradually in the north-west direction. The range of lateral variation can reach 30-40 km, and the uplift phenomenon exists in the plateau. There are three obvious tongue protruding surface buried depth in the central Yunnan block. The variation range of the buried depth of Moho surface is not uniform in all directions: in other regions, the isoline is increasing uniformly. 3. The underground 2km depth in the study area The sediment is widely distributed in the area, Then the velocity of S wave jumps above 3.0km/s. Some of the stations have low velocity structures, which are located near the deep fault, volcanic active area and the central Yunnan block. However, in other areas where the lithosphere is relatively stable, such as the margin of the Sichuan Basin, there is basically no low-velocity structure near the Baoshan block and the Lanping-Simao block. The conclusion of this paper supports the movement model of the lower crust material flow in the Qinghai-Xizang Plateau. That is, the material in the lower crust of the Qinghai-Xizang Plateau was restricted by the tectonic junction between Sichuan Basin and the Himalayas and flowed into Yunnan mainly along the deep and large faults, and the material flow broke through the Lijiang fault. Intruded into the central Yunnan block and distributed within the block.
【學(xué)位授予單位】：云南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P315.2

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