新震级国家标准在四川台网的应用——宽频带面波震级
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摘要
利用四川区域地震台网记录到的国内2009—2016年间的217次地震事件,重新测定宽频带面波震级M_(S(BB))、面波震级M_S和部分矩震级M_W,并进行对比分析,结果显示:(1)M_S与M_(S(BB))差值分布为-0.1~0.6,其中97%的地震M_S较M_(S(BB))偏大,通过正交回归分析,M_(S(BB))较M_S系统偏小0.27左右;(2)M_W与M_S差值为-0.8~0.35,其中M_W与M_S差值在±0.3以内的地震数约为74%,由正交回归分析4.0≤M≤8.0时M_S整体偏大,且偏差值随着震级的增加呈上升趋势,偏大范围为0.1~0.4之间;(3)M_W与M_(S(BB))差值分布为-0.5~0.55,差值在±0.3以内地震占87%,正交回归分析出4.0≤M≤5.0时M_W较M_(S(BB))偏大,偏大范围为0~0.13,而5.0≤M≤8.0时M_W较M_(S(BB))偏小,偏差值均在0.23以内。总体来说,相较于M_S,M_(S(BB))与M_W的偏差更小,M_(S(BB))更接近地震矩震级M_W,更能准确评估地震震级。
We calculated the broadband surface wave magnitude M_(S(BB)),surface wave magnitude M_S and partial moment magnitude M_W of 217 earthquakes in China recorded by Sichuan Seismic Network from 2009 to 2016.The systematic comparison and analysis research of the results shows:the difference between M_(S(BB))and M_S is-0.1~0.6,for 97% earthquakes,M_S is greater than M_(S(BB)).The orthogonal regression analysis result shows,M_(S(BB))is about 0.27 less than M_S .The difference between M_W and M_S is-0.8~0.35,for 74% earthquakes,the difference between M_W and M_S is within ±0.3.Through orthogonal regression analysis,for 4.0≤M≤8.0 earthquakes M_S is greater than M_W,the deviation range from 0.1~0.4 and increase with magnitude increasing.The difference between M_W and M_(S(BB))is-0.55~0.5,for 74%earthquakes,the difference between M_W and M_S is within ±0.3.By orthogonal regression analysis,for4.0≤M≤5.0 earthquakes M_W is greater than M_(S(BB)),the deviation range from 0.1~0.13,for 5.0≤M≤8.0 earthquakes M_W is less than M_(S(BB)),the deviation within 0.23.On the whole,the difference between M_W and M_(S(BB))is less than M_W and M_S .That is,because of closer to M_W,broadband surface wave magnitude M_(S(BB))can more accurately evaluate the magnitude of earthquake.
We calculated the broadband surface wave magnitude M_(S(BB)),surface wave magnitude M_S and partial moment magnitude M_W of 217 earthquakes in China recorded by Sichuan Seismic Network from 2009 to 2016.The systematic comparison and analysis research of the results shows:the difference between M_(S(BB))and M_S is-0.1~0.6,for 97% earthquakes,M_S is greater than M_(S(BB)).The orthogonal regression analysis result shows,M_(S(BB))is about 0.27 less than M_S .The difference between M_W and M_S is-0.8~0.35,for 74% earthquakes,the difference between M_W and M_S is within ±0.3.Through orthogonal regression analysis,for 4.0≤M≤8.0 earthquakes M_S is greater than M_W,the deviation range from 0.1~0.4 and increase with magnitude increasing.The difference between M_W and M_(S(BB))is-0.55~0.5,for 74%earthquakes,the difference between M_W and M_S is within ±0.3.By orthogonal regression analysis,for4.0≤M≤5.0 earthquakes M_W is greater than M_(S(BB)),the deviation range from 0.1~0.13,for 5.0≤M≤8.0 earthquakes M_W is less than M_(S(BB)),the deviation within 0.23.On the whole,the difference between M_W and M_(S(BB))is less than M_W and M_S .That is,because of closer to M_W,broadband surface wave magnitude M_(S(BB))can more accurately evaluate the magnitude of earthquake.
引文
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[12]Kanamori H.The energy release in great earthquakes[J].Journal of Geophysical Research,1977,82(2O):2981-2987.
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[14]Zhao L S,Helmberger D V.Source estimation from broadband regional seismograms[J].Bulletin of the Seismological Society of America,1994,84(1):91-104.
[15]Draper N R,Smith H.Applied Regression Analysis[M]3rd ed.New York:John Wiley&Sons,1998:100-125.
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[2]陈运泰,吴忠良,王培德,等.数字地震学[M].北京:地震出版社,2000.
[3]刘瑞丰,陈运泰,任枭,等.中国地震台网震级的对比[J].地震学报,2007,29(5):467-476.
[4]Richter C F.An instrumental earthquake magnitude scale[J].Bulletin of the Seismological Society of America,1935,25(1):1-32.
[5]Gutenberg B,Richter C F.Magnitude and energy of earthquakes[J].Annali di Geofisica,1956,9(1):7-12.
[6]Gutenberg B.Amplitudes of surface waves and magnitudes of shallow earthquakes[J].Bulletin of the Seismological Society of America,1945,35(1):3-12.
[7]李善邦.中国地震目录[M].北京:科学出版社,1960.
[8]李善邦.中国地震[M].北京:地震出版社,1981.
[9]郭履灿,庞明虎.面波震级和它的台基校正值[J].地震学报,1981,3(3):312-320.
[10]徐德诗.GB17740-1999《地震震级的规定》宣贯教材[M].北京:中国标准出版社,1999.
[11]刘瑞丰,陈运泰,任枭,等.震级的测定[M].北京:地震出版社,2015.
[12]Kanamori H.The energy release in great earthquakes[J].Journal of Geophysical Research,1977,82(2O):2981-2987.
[13]Hanks T C,Kanamori H.A moment magnitude scale[J].Journal of Geophysical Research,1979,84(B5):2348-2350.
[14]Zhao L S,Helmberger D V.Source estimation from broadband regional seismograms[J].Bulletin of the Seismological Society of America,1994,84(1):91-104.
[15]Draper N R,Smith H.Applied Regression Analysis[M]3rd ed.New York:John Wiley&Sons,1998:100-125.
[16]Carroll R J,Ruppert D.The use and misuse of orthogonal regression in linear errors-in-variables models[J].The American Statistician,1996,50(1):1-6.