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Title:: Comparison of Determination of Magnitudes between Yunnan Seismic Network and National Seismic Network and American Seismic Network

Author(s):: YANG Jingqiong; YANG Zhousheng; XU Yaji; QIN Min; ZHANG Huiyuan; ZHANG Guoquan; (Yunnan Earthquake Agency,Kunming 650224,Yunnan,China)

Keywords:: surface wave magnitude; moment magnitude; Yunnan Seismic Network; China Seismic Network; American Seismic Network

摘要:: 利用云南地震台网全面数字化之后(2008—2017年)的记录资料,按照《地震震级的规定》(GB17740—2017)规定的测定方法,对云南地震台网记录的M_L≥4.0地震,重新人工测量其宽频带面波震级M_S(BB)和矩震级M_w,与中国地震台网测定的M_S7以及美国地震台网(NEIC)测定的M_W(NEIC)进行对比分析。结果表明:①M_S(BB)和M_S7测量方法相同,量规函数相等,两者一致性最好。②对于面波震级与矩震级,当M_W在3.5左右时,M_S7,M_S(BB)与M_W一致性最好; M_W<3.5时,M_S7和M_S(BB)均小于M_W; M_W>3.5时,M_S7和M_S(BB)大于M_W。③M_S(BB)与美国地震台网相比较,M_S(BB)在5.5和6.0左右时,与M_W(NEIC)一致性最好,几乎相等; M_S(BB)<5.5时,M_S(BB)<M_W(NEIC); M_S(BB)>6.0时,M_S(BB)>M_W(NEIC)。④M_W和M_W(NEIC)之间存在偏差,M_W整体小于M_W(NEIC)。

Abstract:: Using the data which recorded by the Yunnan Seismic Network after fully complete the digitization(2008-2017),in accordance with the determination method specified by the new magnitude national standard 《Earthquake magnitude provisions》(GB17740—2017),for the earthquakes of magnitude greater than M_L4.0,we manual remeasured the wide band surface wave magnitude M_S(BB) and the moment magnitude Mw,and compared with the M_S7 of the National Network cataloguing results and the M_W(NEIC) measured by the United States Seismic Network(NEIC),the results show that:the measurement method of M_S(BB) and M_S7 are the same,the gauge functions are equal,the consistency of the two is the best.The surface wave magnitude and moment magnitude have the system difference,and M_S7,M_S(BB) and M_W are almost equal when the magnitude is around M_W3.5.For the moment magnitude less than 3.5,M_S7 and M_S(BB) are less than M_W,while for the moment magnitude more than 3.5,M_S7 and M_S(BB) are greater than M_W.Compared with the United States Seismic Network,when M_S(BB) is about 5.5 and 6.0,M_S(BB) and M_W(NEIC) have the best consistency,and the two are almost equal.When M_S(BB) is less than 5.5,M_S(BB) is smaller than M_W(NEIC),while M_S(BB) is greater than M_W(NEIC) when it is greater than 6.0.There is a system deviation between M_W and M_W(NEIC),M_W is less than M_W(NEIC) overall,and with the increase of the magnitude,the deviation value is on the rise.