摘要
依据《地震震级的规定(GB 17740—2017)》,分析了2009—2017年新疆地震台网所记录的新疆及邻区476次中深源地震事件,测定了13601个m_(b)(短周期体波震级)和12035个m_(B(BB))(宽频带体波震级)的数据样本,回归分析m_(b)和m_(B(BB))得到回归方程及量规函数,结果显示m_(b)和m_(B(BB))相关系数为0.966,表明两者显著相关。因此,建议对于中强型中深源地震可以直接从原始速度型宽频带数字地震记录上测定长周期体波震级m_(B(BB)),提高地震速报测定的速度和精度。通过震级偏差统计和台站场地响应计算,分析新疆地震台网中的XKR、HTA、ATS和KSZ等地震台站震级偏差较大的原因为砂岩、灰岩、砂土层等类型的台基放大了场地响应,说明台基类型对体波震级偏差的影响较大。与NEIC测定的体波震级对比时,发现新疆地震台网测定体波震级平均偏大0.42级,且偏差随着震源深度的增加有增大的趋势。
According to the general standard of earthquake magnitude(GB17740-2017),we analyzed 476 the intermediate and deep-focus earthquakes in Xinjiang and the adjacent area from 2009 to 2017.Then we got 13601 m_(b) samples,12035 m_(B(BB))samples,the regression equations,and the calibration function of m_(b) and m_(B(BB)).Through magnitude residual statistical analysis and by calculating the station site response,we concluded that the station bedrocks magnify the station site response,which causes the large magnitude offsets,such as sandstone and limestone and sand soil,So the magnitude offsets of XKR,HTA,ATS and KSZ are relatively large.By comparing with the body wave magnitude from NEIC,we found that magnitudes from our results are greater than that from NEIC’s by 0.42.Moreover,the offsets tend increasingly with the increase of focal depth.
作者
冉慧敏
李文倩
上官文明
Ran Huimin;Li Wenqian;Shangguan Wenming(Earthquake Agency of Xinjiang Uygur Autonomous Region,Urumqi 830011,China)
出处
《中国地震》
北大核心
2022年第1期91-101,共11页
Earthquake Research in China
基金
中国地震局地震科技星火计划青年项目(XH20068Y)
中国地震局地震科技星火计划攻关项目(XH18055)共同资助。
关键词
中深源地震
体波震级
量规函数
台站场地响应
The intermediate and deep-focus earthquake
Body wave magnitude
The calibration function
The station site response
