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云南地震台网震级对比研究
杨晶琼, 杨周胜, 许亚吉, 秦敏, 张会苑, 蔡明军, 李姣
云南省地震局, 昆明 650224
摘要:
利用云南地震台网记录的云南及其周边地区2000~2017年的宽频带数字地震资料,按照新的震级国家标准《地震震级的规定》(GB17740-2017)的测定方法,使用同一套软件,对地方性震级ML、面波震级MS、宽频带面波震级MS(BB)、短周期体波震级mb、宽频带体波震级mB(BB)和矩震级MW重新进行人工测量。并分别用一般线性回归和正交回归方法,对不同震级之间的关系进行对比,给出它们之间的经验关系式。研究结果表明:①当M<4.5时,各种震级之间相差不大,使用地方性震级ML可以较好地表示地震的大小,也能够更加充分地反映区域特性;当4.5≤M<8.0时,宽频带面波震级MS(BB)和矩震级MW均能较好地表示地震的大小,但矩震级MW的测定需要一定时间,因此在速报工作和大震应急中,可以使用MS(BB)表示地震的大小;MS(BB)的测定方法与国际接轨,消除0.2的震级偏差。②对于面波震级MS和宽频带面波震级MS(BB),由于面波测量的位置、计算公式和量归函数不同,MSMS(BB)系统偏高0.2左右;短周期体波震级mb较宽频带体波震级mB(BB)整体偏小0.2左右,主要区别在于仿真模式。③宽频带面波震级MS(BB)和宽频带体波震级mB(BB)均在垂直向原始宽频带记录上直接测定,取消波形仿真环节,另外,相比测定mB(BB)震中距要求大于5度,许多台站被限制,MS(BB)更利于区域台网测定。④当3.5≤ML≤6.5时,MLMW整体偏大;MS≥3.5时,MS也较MW整体偏大,且均随着震级增加,偏差值呈上升趋势。⑤当M≥8.0时,面波震级出现饱和现象,使用矩震级MW表示M≥8.0地震的大小。
关键词:  震级国家标准  地方性震级  面波震级  体波震级  矩震级
DOI:
分类号:P315
基金项目:中国地震局地震科技星火计划项目(XH18043)资助
Comparative Study on the Magnitude of Yunnan Digital Seismic Network
Yang Jingqiong, Yang Zhousheng, Xu Yaji, Qin Min, Zhang Huiyuan, Cai Mingjun, Li Jiao
Yunnan Earthquake Agency, Kunming 650224, China
Abstract:
Using the broadband digital seismic data recorded by the Yunnan Digital Seismic Network in Yunnan and its surrounding areas during 2000~2017,according to the determination method of the New National Standard "Earthquake Magnitude Regulation" (GB17740-2017),the same set of software should be used to re-measure manually the local magnitude ML,the surface wave magnitude MS,the wide band surface wave magnitude MS(BB),the short period body wave magnitude mb,the wide band wave magnitude mB(BB) and the moment magnitude MW. The relationship between different magnitude is compared with the general linear regression and orthogonal regression methods respectively,and the empirical relations between them are given. The results show that there is little difference between the various magnitude:① When M<4.5,and the size of the earthquake can be better represented by the local magnitude ML,and can reflect the regional characteristics more fully. When 4.5 ≤ M < 8.0,the wide band surface wave magnitude MS(BB) and the moment magnitude MW can better represent the magnitude of the earthquake. However,the determination of moment magnitude MW takes a certain amount of time. So in the rapid reporting work and earthquake emergency response,MS(BB) can be used to indicate the size of the earthquake. MS(BB) determination method and international standards,eliminate 0.2 of the magnitude deviation. ② For surface wave magnitude MS and wide band surface wave magnitude MS(BB),the calculation formula and the regression function are different. The MS ratio MS(BB) system is about 0.2 higher. The short period body wave magnitude mb is smaller than the wide band Body wave magnitude mB(BB),and the overall is about 0.2. The main difference should be in the simulation mode. ③ Wide band surface wave magnitude MS(BB) and wide band wave magnitude mB(BB) are directly measured vertically to the original wide band record,eliminating the waveform simulation link. In addition,compared to the determination of mB(BB) epicenter distance requirements greater than 5 degrees,many stations will be limited. MS(BB) is more conducive to regional network measurement. ④ When 3.5 ≤ ML ≤ 6.5,ML is larger than MW as a whole. When MS ≥ 3.5,MS,MW is also the overall size,and with the increase of the magnitude,the deviation value is on the rise. ⑤When M ≥ 8.0,the surface wave magnitude appears saturated,with the moment magnitude MW to indicate the size of the earthquake with M ≥ 8.0.
Key words:  National standard of magnitude  Local magnitude  Surface wave magnitude  Body wave magnitude  Moment magnitude