闽台地区近震震级M_L量规函数研究
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摘要
作者精心地挑选了发生在台湾地区的ML=4.0~5.0壳内地震215个,用福建台网记录到的这些地震的最大地动位移资料,利用多元回归分析方法,拟合出最大地动位移的衰减特征为logA=2.07+231.1/Δ(150km≤Δ≤650km)与之相应的量规函数的表达式为R(Δ)=3.45-231.1(1/Δ-0.01)(150km≤Δ≤650km)对于1999年9月~2005年8月发生在台湾地区地壳内的790个地震,分别利用相关部门在1997年制定的量规函数和上式所示量规函数,求出福建台网测定的平均震级及均方差。结果表明,据前者所得的平均均方差为0.20,而后者为0.18。如果在测定震级时,考虑到台基修正值,则后者为0.13;把测定的结果与台湾相关部门的测定结果进行比较,前者平均低了0.50左右,而后者高了0.08左右。
The author carefully selected the earthquakes with M_L=4.0～5.0 215 occurred under the crust in the Taiwan region ,the attenuation character istics of max-displacement recorded by the Fujian digital network has appeared by multi-analysis as followslog A=2.07+231.1/Δ (150km≤Δ≤650km) And the expression formula of calibration function is correlatively as followsR(Δ)=3.45-231.1(1/Δ-0.01) (150km≤Δ≤650km)Then,the author determined the magnitude and its error by the data of Fujian network with the calibration function appeared in 1997 and above formula for 790 earthquakes occurred in the crust in the Taiwan region during 1997.9～2005.8 . The result indicated that the average error of network is 0.20 with the former and 0.18 with the latter. The average error is 0.13 with the latter with station correction. The magnitude value with the former is lower than it averagely by 0.50 that the result is determined by the Taiwan seismologists,but magnitude value with the latter is higher than it averagely by 0.08 that the result is determined by the Taiwan seismologists.
The author carefully selected the earthquakes with M_L=4.0～5.0 215 occurred under the crust in the Taiwan region ,the attenuation character istics of max-displacement recorded by the Fujian digital network has appeared by multi-analysis as followslog A=2.07+231.1/Δ (150km≤Δ≤650km) And the expression formula of calibration function is correlatively as followsR(Δ)=3.45-231.1(1/Δ-0.01) (150km≤Δ≤650km)Then,the author determined the magnitude and its error by the data of Fujian network with the calibration function appeared in 1997 and above formula for 790 earthquakes occurred in the crust in the Taiwan region during 1997.9～2005.8 . The result indicated that the average error of network is 0.20 with the former and 0.18 with the latter. The average error is 0.13 with the latter with station correction. The magnitude value with the former is lower than it averagely by 0.50 that the result is determined by the Taiwan seismologists,but magnitude value with the latter is higher than it averagely by 0.08 that the result is determined by the Taiwan seismologists.
引文
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中国地震局编,2001,地震及前兆数字观测技术规范,北京:地震出版社。
陈祥熊、吴长江、黄向荣等,1997,闽台两岸区域地震监测台网及地震监测能力比较,地震地磁观测与研究,18(3),13～20。
陈永秉编著,1983,数理统计浅说,103,北京:农业出版社。
葛焕称,1982,近震震级,地震地磁观测与研究,3(3),65～70。
黄玮琼、金严、胡荣盛,1982,近震衰减特征的地区差异及近震震级的估算,地震学报,4(4),337～349。
林仙坎,2004,关于网外地震的定位问题,中国地震,20(3),276～284。
彭美凤,1982,闽台地区量规函数的探讨,地震地磁观测与研究,3(3),71～75。
《数学手册》编写组,1979,数学手册,817,1367,北京:高等教育出版社。
严尊国,1986,建立华北南部地方均匀震级系统的尝试,中国地震,2(2),57～63。
严尊国、李普丽、薛军蓉,1992,中国近震震级量规函数研究,中国地震,8(4),76～90。
中国科学院计算中心概率统计组编著,1979,概率统计计算,119,北京:科学出版社。
中国科学院地球物理研究所编著,1976,地震学基础,126～127,北京:科学出版社。
中国地震局编,2001,地震及前兆数字观测技术规范,北京:地震出版社。
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