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云南地区近震震级与面波震级转换关系研究
杨晶琼, 杨周胜, 蔡明军, 许亚吉, 梁勇
云南省地震局,昆明市北市区北辰大道650224
摘要:
利用云南地区数字地震台站记录的云南及周边地区2000~2011年4.0级以上可同时测定近震震级ML和面波震级MS的433个地震波形数据,将速度数据进行仿真,即近震震级ML在仿真短周期地震仪DD-1记录上测定,面波震级MS在仿真中长周期地震仪SK记录上测定,对全部人工重新测定的ML和MS,采用线性回归和正交回归方法,得到了它们之间的转换关系式。结果表明,自20世纪70年代使用至今的公式MS = 1.13ML - 1.08与云南地区实际情况存在系统偏差,已不适用于云南地区。考虑到区域差异,认为采用关系式MS = 1.13ML - 0.86作为新的转换关系更合理适用。同时,对云南地震台网和国家地震台网都有记录的地震数据进行对比,发现云南台网和国家台网测定的绝大多数地震ML差值为- 0.2~ 0.4,差值为0.2的地震数量最多;MS差值为-0.4~0.2,差值为-0.2的地震数量最多。
关键词:  震级测定  面波震级MS  近震震级ML  震级转换
DOI:
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基金项目:中国地震局“测震台网青年骨干培养专项”(20120104)资助
Study on the ML and MS of conversation in the Yunnan Regional Digital Networks
Yang Jingqiong, Yang Zhousheng, Cai Mingjun, Xu Yaji, Liang Yong
Earthquake Administration of Yunnan Province,Kunming 650224,China
Abstract:
Seismic station records of M ≥4. 0 earthquakes in the Yunnan Regional Digital Networks in 2000 ~ 2011 were used to determine near earthquake magnitude ML and wave magnitude MS of 433 earthquake waveform data. The speed data were simulated: near earthquake magnitude ML was simulated in terms of short cycle seismographs by DD-1 records,and surface wave magnitude MS in terms of the long cycle seismographs by SK records. All the ML and MS data were then man-checked with linear regression and orthogonal regression and obtain the conversion formula between them. Results showed that the formula MS = 1. 13ML - 1. 08 used since the 1970s may cause problems when applied to the Yunnan region. The adjusted formula of MS = 1. 13ML - 0. 86 is more applicable as the new conversion relationship. Meanwhile,the comparison between the recorded data from Yunnan seismic network and the national seismic network shows the ML difference of - 0. 2 ~ 0. 4 in most of these data with 0. 2 as the majority and MS difference between - 0. 4 ~ 0. 2 with - 0. 2 as the majority.
Key words:  Magnitude determination  Surface-wave magnitude MS  Local earthquake magnitude ML  Conversion formula