【摘要】：構(gòu)造應(yīng)力場(chǎng)是地殼運(yùn)動(dòng)及變形的原因,是地球動(dòng)力學(xué)重要組成部分。力是物質(zhì)變形和運(yùn)動(dòng)的本質(zhì),因此構(gòu)造應(yīng)力場(chǎng)應(yīng)用范圍廣泛,其研究對(duì)于構(gòu)造理論、地震分析預(yù)報(bào)、工程抗震等領(lǐng)域都具有極其重要的意義。構(gòu)造應(yīng)力場(chǎng)具體是指作用在地殼(或巖石圈)上,與一定構(gòu)造單元的產(chǎn)生和發(fā)展有關(guān)的應(yīng)力組合,即：由構(gòu)造運(yùn)動(dòng)引起的、某一瞬時(shí)地殼(或巖石圈)上各點(diǎn)應(yīng)力大小和方向總和。 基于震源機(jī)制解反演構(gòu)造應(yīng)力場(chǎng)是眾多研究方法之一,屬于地球物理方法。該方法具有以下優(yōu)點(diǎn)：1、原理基于構(gòu)造地質(zhì)學(xué)、巖石力學(xué)和固體力學(xué),物理含義明確：2、攜帶深部或發(fā)震部位的信息,對(duì)于了解和掌握深部應(yīng)力狀態(tài)有利：3、資料獲取及研究成本低；4、結(jié)果產(chǎn)出快；5、在資料豐富的條件下結(jié)果可靠性有保障。 本文收集了云南1999-2014年,云南及周邊范圍3.0級(jí)以上包含可靠震源機(jī)制結(jié)果的地震(3.0～6.6級(jí)),并刪除余震,保留590個(gè)地震事件,以此作為反演計(jì)算和統(tǒng)計(jì)分析的樣本。并根據(jù)之前研究成果,將云南區(qū)域按照1°×1°劃分為39個(gè)區(qū)域,形成27組統(tǒng)計(jì)、反演數(shù)據(jù)組,進(jìn)行了構(gòu)造應(yīng)力場(chǎng)反演。使用統(tǒng)計(jì)和反演兩種方法對(duì)比并結(jié)合崔效鋒研究結(jié)果表明：1、控制云南區(qū)域的力源沒(méi)有顯著變化,基本穩(wěn)定；2、由于緬甸塊體對(duì)云南的推擠作用、四川龍門山構(gòu)造帶的活動(dòng),使得云南省保山地區(qū)和昭通地區(qū)應(yīng)力場(chǎng)產(chǎn)生變化,表明構(gòu)造應(yīng)力場(chǎng)的時(shí)空變化與地震活動(dòng)是相關(guān)的；3、統(tǒng)計(jì)P軸優(yōu)勢(shì)方位的方法與反演方法都對(duì)地震事件數(shù)目高度敏感。當(dāng)?shù)卣饠?shù)目較少,二者的差別離散,呈現(xiàn)非線性化的特征；當(dāng)?shù)卣饠?shù)目大于30個(gè),二者的差別收斂,逐漸趨于線性。二者的一致性也從一個(gè)側(cè)面反應(yīng)了結(jié)果的可靠性。因此地震數(shù)目對(duì)于地球物理方法研究區(qū)域構(gòu)造應(yīng)力場(chǎng)至關(guān)重要。
[Abstract]:Tectonic stress field is the cause of crustal movement and deformation and an important part of geodynamics. Force is the essence of material deformation and motion, so the application of tectonic stress field is wide, and its research is of great significance in the field of structural theory, earthquake analysis and prediction, engineering earthquake resistance and so on. The tectonic stress field is the combination of stresses acting on the crust (or lithosphere), which is related to the generation and development of certain tectonic units, that is, caused by tectonic movement, The sum of the stresses and directions of each point in an instantaneous crust (or lithosphere). Inversion of tectonic stress field based on focal mechanism is one of many research methods and belongs to geophysical method. This method has the following advantages: 1: 1. The principle is based on structural geology, rock mechanics and solid mechanics, and has a clear physical meaning: 2, carrying information about the deep or seismogenic position. For understanding and mastering the deep stress state, the data acquisition and research cost is low, and the result output is 5. The reliability of the results is guaranteed under the condition of abundant data. In this paper, we collected the earthquakes (M = 3.06.6) with a magnitude of 3.0 or above in Yunnan and its surrounding area from 1999 to 2014, and deleted aftershocks and retained 590 seismic events as samples for inversion calculation and statistical analysis. According to the previous research results, the Yunnan region is divided into 39 regions according to 1 擄脳 1 擄, and 27 groups of statistics are formed, the data sets are inversed, and the tectonic stress field inversion is carried out. Comparing the two methods using statistics and inversion and combining with the results of Cui Xiaofeng's study, it is shown that the force source controlling Yunnan area has no significant change and is basically stable. Due to the pushing and squeezing of the Myanmar block to Yunnan, the activity of the Longmen Mountain tectonic belt in Sichuan Province, The variation of stress field in Baoshan area and Zhaotong area of Yunnan Province shows that the temporal and spatial variation of tectonic stress field is related to seismic activity and the methods of statistical dominant orientation of P-axis and inversion method are highly sensitive to the number of earthquake events. When the number of earthquakes is small, the difference between them is discrete, showing the feature of nonlinearity, and when the number of earthquakes is more than 30, the difference converges and tends to be linear. The consistency of the two also reflects the reliability of the results from one side. Therefore, the number of earthquakes is very important for geophysical methods to study the regional tectonic stress field.
【學(xué)位授予單位】：云南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P315.727

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