通过对东南亚和哀牢山红河构造带演化已有模式的分析,在近年来本区海上研究资料的基础上,结合滇西地质情况,认为东南亚的构造格局是由印度洋、太平洋和欧亚三大构造体系共同作用形成的。60～15 Ma BP,欧亚构造体系分别与太平洋和印度洋...通过对东南亚和哀牢山红河构造带演化已有模式的分析,在近年来本区海上研究资料的基础上,结合滇西地质情况,认为东南亚的构造格局是由印度洋、太平洋和欧亚三大构造体系共同作用形成的。60～15 Ma BP,欧亚构造体系分别与太平洋和印度洋构造体系作用,在东南亚东、西部形成两个弧后盆地扩张体系,两体系扩张强度和方向的不同,形成转换调节构造带——哀牢山红河构造带。东部较强的扩张作用使扬子板块向北运动,形成哀牢山以东的逆冲构造。并导致哀牢山红河构造带的左行走滑。大约15 Ma BP之后,印度洋构造体系作用的加强引发印支板块向东南逃逸,形成挤出模式。构造机制的改变使印支板块以南及以西从张扭变为压扭体制,同时使哀牢山红河构造带经受了两期不同变形机制的左行走滑。展开更多
Located in an earthquake-prone region,the geological structures in Yunnan Province are complex. Taking into account that Tonghai county is located in the intersection of Xiaojiang fault and Honghe fault, an ACF-4M ELF...Located in an earthquake-prone region,the geological structures in Yunnan Province are complex. Taking into account that Tonghai county is located in the intersection of Xiaojiang fault and Honghe fault, an ACF-4M ELF electromagnetic instrument was installed at the Tonghai seismic station,which has produced continuous reliable data. The author collected the data and information for the year 2009 and 2010,and performed analysis on the variation characteristics of both geomagnetic fields and electrical resistivity. The result shows that the 1Hz and 39Hz electromagnetic power spectra are 0. 2 to 1. 4 orders of magnitude higher than the normal values immediately before many earthquakes. The anomalies are represented by the abrupt changes of the electric and magnetic field power spectra in earthquake and aftershock sequences,and the amplitude of change is related to the size of earthquake magnitude and epicentral distance. The electrical resistivity also obviously changes. Therefore, further research on the anomalous characteristics of ELF electromagnetic data will be meaningful to the future use of this instrument in earthquake prediction.展开更多
文摘通过对东南亚和哀牢山红河构造带演化已有模式的分析,在近年来本区海上研究资料的基础上,结合滇西地质情况,认为东南亚的构造格局是由印度洋、太平洋和欧亚三大构造体系共同作用形成的。60～15 Ma BP,欧亚构造体系分别与太平洋和印度洋构造体系作用,在东南亚东、西部形成两个弧后盆地扩张体系,两体系扩张强度和方向的不同,形成转换调节构造带——哀牢山红河构造带。东部较强的扩张作用使扬子板块向北运动,形成哀牢山以东的逆冲构造。并导致哀牢山红河构造带的左行走滑。大约15 Ma BP之后,印度洋构造体系作用的加强引发印支板块向东南逃逸,形成挤出模式。构造机制的改变使印支板块以南及以西从张扭变为压扭体制,同时使哀牢山红河构造带经受了两期不同变形机制的左行走滑。
基金funded by Seismic Monitoring,Prediction and Research Project"The Application of Ultra Low Frequency Electromagnetic Observation in Yunnan and Its Adjacent Region"of China Earthquake Administration in 2010
文摘Located in an earthquake-prone region,the geological structures in Yunnan Province are complex. Taking into account that Tonghai county is located in the intersection of Xiaojiang fault and Honghe fault, an ACF-4M ELF electromagnetic instrument was installed at the Tonghai seismic station,which has produced continuous reliable data. The author collected the data and information for the year 2009 and 2010,and performed analysis on the variation characteristics of both geomagnetic fields and electrical resistivity. The result shows that the 1Hz and 39Hz electromagnetic power spectra are 0. 2 to 1. 4 orders of magnitude higher than the normal values immediately before many earthquakes. The anomalies are represented by the abrupt changes of the electric and magnetic field power spectra in earthquake and aftershock sequences,and the amplitude of change is related to the size of earthquake magnitude and epicentral distance. The electrical resistivity also obviously changes. Therefore, further research on the anomalous characteristics of ELF electromagnetic data will be meaningful to the future use of this instrument in earthquake prediction.
