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目前北京地区开展的断层位移测量,是用一等基线测量和一等水准测量的要求进行作业的。其目的是为较大地震的中长期预报和地震科学研究提供依据。基线测量和水准测量的观侧包含着一定的误差,现行的规范细则规定了一定的限差,这种限差一般是中误差的2-3倍。当观测误差大于相邻两期的变化量时,在一般情况下可以说明断层没有什么活动,属正常的范围。当相邻两期的变化量大于观测允许误差时,有两种可能,一种可能说明断层有活动,另一种可能是外界干扰的影响。这种变化量不一定是地震的前兆。在讨论复测周期之前,必须了解目前观测结果所达到的精度。据统计,目前基线观测相对比较稳定。因此,本文着重分析短水准测量的精度,以此为基础分析各测点的观测周期。
At present, the fault displacement measurement carried out in Beijing is based on the requirements of first-class baseline measurement and first-class level measurement. Its purpose is to provide a basis for mid- and long-term prediction of larger earthquakes and seismic science research. The baseline measurement and level measurement contain a certain amount of errors on the concept side. The current code stipulates a certain limit, which is usually 2-3 times the error. When the observation error is greater than the change of two adjacent periods, it can be shown that there is no activity of the fault in normal circumstances, which belongs to the normal range. There are two possibilities when the variation of two adjacent periods is larger than the allowable error of observation. One may indicate that the fault has activity and the other may be the influence of external disturbance. This amount of change is not necessarily a precursor to the earthquake. Before discussing the retest period, you must understand the accuracy of the current observations. According to statistics, the current baseline observations are relatively stable. Therefore, this article focuses on the analysis of short leveling accuracy, based on which the observation period of each measurement point is analyzed.