The Funan-Huoqiu area is located in the border tectonic belt between the North China and South China active block regions. By means of seismological and geological surveys and synthetic analysis, evidences of tectonic...The Funan-Huoqiu area is located in the border tectonic belt between the North China and South China active block regions. By means of seismological and geological surveys and synthetic analysis, evidences of tectonic deformation in lower intensity have been found in the area since Late Pleistocene, where small earthquakes are distributed linearly along the main faults, conjugate shear joints are developed in the Upper Pleistocene nearby the faults. In the south of the studied region, fissures with different lengths, widths and directions occurred successively in Gushi, Huoqiu, Funan and other places of the area, in the 1970’s, and the direction of the fissures is approximately consistent with that of the Feizhong fault and Wanglaorenji fault. The authors hold that the clustering of small earthquakes, the conjugate shear joints developed in the Upper Pleistocene, the crumpled deformation of materials on fault plane, and the development of modern surface fissures in the area all reflect that the energy in the crust was slowly released, and that the weak deformation took place in corresponding faults. There was only one destructive earthquake taking place in the area (the Jiangkouji {M_S43/4} earthquake). Altogather, there has been weak activity in the area since the Late Quaternary, and it is mainly shown as a creep-slip.展开更多
Based on data from an across-fault survey along the Sichuan-Yunnan rhombic block boundaries, the recent deformation characteristics on each fault have been analyzed. It was found that the rate of crustal deformation i...Based on data from an across-fault survey along the Sichuan-Yunnan rhombic block boundaries, the recent deformation characteristics on each fault have been analyzed. It was found that the rate of crustal deformation is slowing down along the northern segment and increasing along the southern segment. Each fault has different features of deformation. The horizontal deformation is mainly characterized by left-lateral strike-slip. The rate of vertical deformation is less than that of the horizontal deformation. The faults have the feature of upper wall uplifting alternated with descending. The anomaly changes of crustal deformation at some sites are closely related to the seismicities near the sites.展开更多
现实中存在许多人为制造或自然形成的微地形,以其为单位的应变分布与其所在板块的整体应变分布具有差异,本研究选取地壳活动相对活跃的腾冲市和顺镇区域作为试验区,实验表明已有的整体旋转与线性应变模型(Rotation in the Entire Block ...现实中存在许多人为制造或自然形成的微地形,以其为单位的应变分布与其所在板块的整体应变分布具有差异,本研究选取地壳活动相对活跃的腾冲市和顺镇区域作为试验区,实验表明已有的整体旋转与线性应变模型(Rotation in the Entire Block and Linear Strain Mode,RELSM)在描述板块内部局部微地形应变时表现不佳;为精细刻画板内应变,在已有的RELSM模型基础上,通过引入地形因素,并联合GNSS、InSAR数据,通过改进型粒子群算法反演板内局部区域应变场参数,为局部区域精细化的地壳活动性评估提供帮助.展开更多
文摘The Funan-Huoqiu area is located in the border tectonic belt between the North China and South China active block regions. By means of seismological and geological surveys and synthetic analysis, evidences of tectonic deformation in lower intensity have been found in the area since Late Pleistocene, where small earthquakes are distributed linearly along the main faults, conjugate shear joints are developed in the Upper Pleistocene nearby the faults. In the south of the studied region, fissures with different lengths, widths and directions occurred successively in Gushi, Huoqiu, Funan and other places of the area, in the 1970’s, and the direction of the fissures is approximately consistent with that of the Feizhong fault and Wanglaorenji fault. The authors hold that the clustering of small earthquakes, the conjugate shear joints developed in the Upper Pleistocene, the crumpled deformation of materials on fault plane, and the development of modern surface fissures in the area all reflect that the energy in the crust was slowly released, and that the weak deformation took place in corresponding faults. There was only one destructive earthquake taking place in the area (the Jiangkouji {M_S43/4} earthquake). Altogather, there has been weak activity in the area since the Late Quaternary, and it is mainly shown as a creep-slip.
文摘Based on data from an across-fault survey along the Sichuan-Yunnan rhombic block boundaries, the recent deformation characteristics on each fault have been analyzed. It was found that the rate of crustal deformation is slowing down along the northern segment and increasing along the southern segment. Each fault has different features of deformation. The horizontal deformation is mainly characterized by left-lateral strike-slip. The rate of vertical deformation is less than that of the horizontal deformation. The faults have the feature of upper wall uplifting alternated with descending. The anomaly changes of crustal deformation at some sites are closely related to the seismicities near the sites.
文摘现实中存在许多人为制造或自然形成的微地形,以其为单位的应变分布与其所在板块的整体应变分布具有差异,本研究选取地壳活动相对活跃的腾冲市和顺镇区域作为试验区,实验表明已有的整体旋转与线性应变模型(Rotation in the Entire Block and Linear Strain Mode,RELSM)在描述板块内部局部微地形应变时表现不佳;为精细刻画板内应变,在已有的RELSM模型基础上,通过引入地形因素,并联合GNSS、InSAR数据,通过改进型粒子群算法反演板内局部区域应变场参数,为局部区域精细化的地壳活动性评估提供帮助.
