钻孔应变观测能够告诉我们些什么?
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摘要
以YRY-4型四元件钻孔应变地震仪的观测资料为基础,结合不同的震例,探讨钻孔应变观测的意义。主要研究的内容有从多年应变的长期信号看地块的稳定与活动性;从各台站潮汐玫瑰图形的时空变化中,寻找我国大陆地质构造运动的特性及力源;通过汶川8级大地震前后,距汶川最近的姑咱地震台记录到的海量应变异常记录,认识大地震的前兆;通过观测数据的自洽与失洽、震前震源区岩层进入不可逆的"亚失稳态"等多方面的深入分析,进一步明确钻孔应变观测的作用。
Based on the observation data of YRY-4 four-element borehole strain seismographs and different earthquake cases,the significance of borehole strain observation is discussed in this paper.The main research contents are as follows:inspecting the stability and activity of the block from the long-term signals of multi-year strain;searching for the characteristics and sources of tectonic movement in the mainland of China from the temporal and spatial variations of tidal rose patterns at various stations;recognizing the precursors of large earthquakes through the records of massive strain anomalies recorded by Guza seismic station,which is nearest to Wenchuan,before and after the Wenchuan Ms8 earthquake;and the self-consistency and inconsistency of observation data,the irreversible meta-instability of the strata in the source area before earthquakes.The role of borehole strain observation is further clarified from the deep analysis in various aspects carried in this study.
Based on the observation data of YRY-4 four-element borehole strain seismographs and different earthquake cases,the significance of borehole strain observation is discussed in this paper.The main research contents are as follows:inspecting the stability and activity of the block from the long-term signals of multi-year strain;searching for the characteristics and sources of tectonic movement in the mainland of China from the temporal and spatial variations of tidal rose patterns at various stations;recognizing the precursors of large earthquakes through the records of massive strain anomalies recorded by Guza seismic station,which is nearest to Wenchuan,before and after the Wenchuan Ms8 earthquake;and the self-consistency and inconsistency of observation data,the irreversible meta-instability of the strata in the source area before earthquakes.The role of borehole strain observation is further clarified from the deep analysis in various aspects carried in this study.
引文
[1]刘序俨,王紫燕,方宏芳,等.对当前四分量钻孔应变观测的审视[J].地球物理学报,2014(10):3332-3346.
[2]池顺良,武红岭,骆鸣津.钻孔应变观测中潮汐因子离散性与各向异性原因探讨[J].地球物理学进展,2007(6):1746-1753.
[3]马杏垣.重力作用与构造运动[M].北京:地震出版社,1989:133.
[4]邱泽华,张宝红,池顺良,等.汶川地震前姑咱台观测的异常应变变化[J].中国科学:地球科学,2010,40(8):1031-1039.
[5]刘琦,张晶.S变换在汶川地震前后应变变化分析中的应用[J].大地测量与地球动力学,2011,31(4):6-9.
[6]马瑾.从“是否存在有助于预报的地震先兆”说起[J].科学通报,2016(61):409-414.
[2]池顺良,武红岭,骆鸣津.钻孔应变观测中潮汐因子离散性与各向异性原因探讨[J].地球物理学进展,2007(6):1746-1753.
[3]马杏垣.重力作用与构造运动[M].北京:地震出版社,1989:133.
[4]邱泽华,张宝红,池顺良,等.汶川地震前姑咱台观测的异常应变变化[J].中国科学:地球科学,2010,40(8):1031-1039.
[5]刘琦,张晶.S变换在汶川地震前后应变变化分析中的应用[J].大地测量与地球动力学,2011,31(4):6-9.
[6]马瑾.从“是否存在有助于预报的地震先兆”说起[J].科学通报,2016(61):409-414.