摘要
选用2003年1月～2005年3月山西数字地震台网报告中可交的地震,选取了单台样本数接近和超出100的17个子台数据,从震级偏差频次分布、仪器、量规函数、台基诸因素,对单台震级的影响上作了定量统计和分析,得出仪器影响存在一定的震级负偏差,但不大;量规函数、台基是引起山西台网单台震级偏差的主要原因。本文给出了量规函数和台基校正值,校正之后,单台震级偏差94%(即17个台中除镇川1个)以上震级平均偏差在±0．2之内。这对于提高山西数字地震台网测定近震震级,提高台网速报质量具有极其重要的实际意义。
In this paper, the magnitude deviation of the earthquakes, which are selected from the report of digital seismic network of Shanxi Province from Jan 2003 to March 2005, and are near or more than 100 samples for each of 17 substations, are quantitatively statistic analyzed on the frequency distribution, Instrument type, scale function and station foundations. The result shows that the influence of instrument to the magnitude deviation is negative but little. The more significant influent factors are the scale function and the station foundation. The corrections of scale function and station foundation are presented in this paper. After corrected, the magnitude deviation of 94 percent stations （all of 17 station but only one, Zhenchuan Seismic Station） are less than ± 0.2. This is significance for improving the accuracy of local earthquake magnitude measurement and the quality of quick report in the digital seismic network of Shanxi Province.
出处
《地震地磁观测与研究》
2007年第2期41-46,共6页
Seismological and Geomagnetic Observation and Research
关键词
震级偏差
单台震级
台基
统计
magnitude deviation, substational magnitude, station foundation, statistics
