基于震源机制解反演研究云南现今构造应力场特征
发布时间：2018-08-31 15:24
【摘要】：构造应力场是地壳运动及变形的原因,是地球动力学重要组成部分。力是物质变形和运动的本质,因此构造应力场应用范围广泛,其研究对于构造理论、地震分析预报、工程抗震等领域都具有极其重要的意义。构造应力场具体是指作用在地壳(或岩石圈)上,与一定构造单元的产生和发展有关的应力组合,即：由构造运动引起的、某一瞬时地壳(或岩石圈)上各点应力大小和方向总和。 基于震源机制解反演构造应力场是众多研究方法之一,属于地球物理方法。该方法具有以下优点：1、原理基于构造地质学、岩石力学和固体力学,物理含义明确：2、携带深部或发震部位的信息,对于了解和掌握深部应力状态有利：3、资料获取及研究成本低；4、结果产出快；5、在资料丰富的条件下结果可靠性有保障。 本文收集了云南1999-2014年,云南及周边范围3.0级以上包含可靠震源机制结果的地震(3.0～6.6级),并删除余震,保留590个地震事件,以此作为反演计算和统计分析的样本。并根据之前研究成果,将云南区域按照1°×1°划分为39个区域,形成27组统计、反演数据组,进行了构造应力场反演。使用统计和反演两种方法对比并结合崔效锋研究结果表明：1、控制云南区域的力源没有显著变化,基本稳定；2、由于缅甸块体对云南的推挤作用、四川龙门山构造带的活动,使得云南省保山地区和昭通地区应力场产生变化,表明构造应力场的时空变化与地震活动是相关的；3、统计P轴优势方位的方法与反演方法都对地震事件数目高度敏感。当地震数目较少,二者的差别离散,呈现非线性化的特征；当地震数目大于30个,二者的差别收敛,逐渐趋于线性。二者的一致性也从一个侧面反应了结果的可靠性。因此地震数目对于地球物理方法研究区域构造应力场至关重要。
[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 掳脳 1 掳, 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.
【学位授予单位】：云南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P315.727
本文编号：2215397
[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 掳脳 1 掳, 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.
【学位授予单位】：云南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P315.727
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