摘要
本次研究选用了长春地震台2000年至2004年近震速报资料,重新测算了数字地震仪近震震级,并以《吉林省地震目录》给出的震级为标准震级,进行了震级偏差统计分析。研究结果表明,随着震中距的变化长春地震台震级偏差变化较大,为使校正值精度提高,我们分段给出了长春台数字化地震仪水平向记录近震震级台站校正值。
This paper analyzes the local magnitude derivation statistically by using instant materials of local earthquakes from 2000 to 2004 at Changchun Seismic Station and recalculates local magnitude derivation recorded by digital seismic apparatus,which is normed by the contents of earthquake in Jilin province.The result approves that the calculated horizontal figures from the digital seismic apparatus are lowered by 0.33.The standard error is± 0.041.By analyzing the results,we found that the longer distance of the epicentre,the greater the magnitude derivation.In order to improve the accuracy rating of correction figures,we gave the horizontally recorded correction figures about the local magnitude derivation from digital seismic apparatus in Changchun seismic station by segments.