区域性场地V_s30及峰值加速度放大系数估算方法
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摘要
地震动速报评估方法中常常考虑场地的影响,为了提高地形坡度模型的区域性地表30m的平均剪切波速Vs30估算精度,本文提出了基于工程钻孔资料的Vs30的修正方法。通过计算实际钻孔的Vs30值与坡度模型估算的Vs30值之间的残差,分析了残差的空间变化趋势,利用克里金插值对所研究区域的Vs30残差趋势面进行插值,并与估算的Vs30进行空间叠加,实现了Vs30的修正。选取K-net和Kik-net台网中台站的剪切波速资料和强震记录回归了峰值加速度放大系数与场地Vs30的经验关系,将其应用于基于ShakeMap框架的地震动快速评估系统绘制了汶川地震影响区域的基岩和地表加速度峰值,分析场地条件对于地震动的实际影响,结果表明区域性场地Vs30及峰值加速度放大系数估算方法具有一定的适用性。
The method of Vs30 estimation using topography slope data usually leads to great error.In this paper the relationship between slope and measured Vs30 is analyzed based on statistics and a correction method is given based on engineering boreholes data.On the basis of statistical Vs30 estimation model,the residual between the actually measured and estimated Vs30 is calculated to analyze the Vs30 residual spatial trends and the modified regional Vs30 is calculated by overlaying the regional Vs30 layer and residual trend layer.Using shear wave velocity data and recordings from K-net and Kik-net,linear regression model of PGA amplification factor is established.As an example,the modified PGA map of Wenchuan earthquake is calculated under the ShakeMap system to validate the efficiency of this method.
The method of Vs30 estimation using topography slope data usually leads to great error.In this paper the relationship between slope and measured Vs30 is analyzed based on statistics and a correction method is given based on engineering boreholes data.On the basis of statistical Vs30 estimation model,the residual between the actually measured and estimated Vs30 is calculated to analyze the Vs30 residual spatial trends and the modified regional Vs30 is calculated by overlaying the regional Vs30 layer and residual trend layer.Using shear wave velocity data and recordings from K-net and Kik-net,linear regression model of PGA amplification factor is established.As an example,the modified PGA map of Wenchuan earthquake is calculated under the ShakeMap system to validate the efficiency of this method.
引文
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[11]张勇,冯万鹏,许力生,等.2008年汶川大地震的时空破裂过程[J].中国科学D辑,2008,38(10):1186-1194.ZHANG Yong,FENG Wanpeng,XU Lisheng,et al.Spatial and temporal rupture process of the 2008 Wenchuan earthquake[J].Science in ChinaEarth Sciences,2008,38(10):1186-1194.(in Chinese)
[12]Youngs R R,Chiou S J,Silva W J,et al.Strong ground motion attenuation relationships for subduction zone earthquakes[J].Seism.Res.Lett.1997,68(1):58-73.
[13]王卫民,赵连锋,李娟,等.四川汶川8.0级地震震源过程[J].地球物理学报,2008,51(5):1403-1410.WANG Weiming,ZHAO Lianfeng,LI Juan,et al.Rupture process of the Ms8.0 Wenchuan earthquake of Sichuan,China[J].Chinese J.Geo-phys,2008,5(5):1403-1410.(in Chinese)
[14]http://www.cea.gov.cn/manage/html/8a8587881632fa5c0116674a018300cf/_content/08_08/29/1219979564089.html.
[2]Masashi Matsuoka,Kazue Wakamtsu,Kazuo Fujimoto,et al.Average shear wave velocity mapping using Japan engineering geomorphologic classifi-cation map[J].Structural Eng.Earthquake Eng.JSCE,2006,23(1):57s-68s.
[3]Chyi-Tyi Lee,Bi-Ru Tsai.Mapping Vs30 in Taiwan[J].Terr.Atmos.Ocean.Sci,2008,19(6):671-682.
[4]Wald D J,Allen T.I.Topographic slope as a proxy for seismic site conditions and amplification[J].Bull.Seismol.Soc.Am.2007,97:1379-1395.
[5]李小军,彭青.不同类别场地地震动参数的计算分析[J].地震工程与工程振动,2001,21(1):29-36.LI Xiaojun,PENG Qing.Calculation and analysis of earthquake ground motion parameters for different site categories[J].Journal of EarthquakeEngineering and Engineering Vibration,2001,21(1):29-36.(in Chinese)
[6]Kazuo Fujimoto,Saburoh Midorikawa.Prediction of average shear wave velocity for ground shaking mapping using the digital national land informa-tion of Japan[C]//3th World Conference on Earthquake Engineering Vancouver,B.C,Canada,2004.
[7]Noboru Kamiakito,Takashi Sato,HiroYukiNishi,et al.Estimation of site amplification factors using strong motion records of Hokkaido[C]//The14th World Conference on Earthquake Engineering,Beijing,2008:12-17.
[8]Yih-Min Wu,Tzay-chyn Shin,Chien-Hsinchang,et al.Near Real-Time Mapping of peak ground acceleration and peak ground Velocity following astrong earthquake[J].Bull.Seism.Soc.Am 2001,l.91(5):1218-1228.
[9]史大成,温瑞智,任叶飞,等.基于GIS的场地分类方法研究[J].地理信息世界,2011,9(1):23-27.SHI Dacheng,WEN Ruizhi,REN Yefei,et al.The study of site classification based on GIS[J].Geomatics World,2011,9(1):23-27.(in Chi-nese)
[10]邓起东,陈社发.龙门山及其邻区的构造和地震活动及动力学[J].地震地质,1994.16(4):389-403.DENG Qidong,CHEN Shefa.Tectonic seismicity and dynamics of Longmenshan mountains and its adjacent regions[J].Seismology and Geology,1994.16(4):389-403.(in Chinese)
[11]张勇,冯万鹏,许力生,等.2008年汶川大地震的时空破裂过程[J].中国科学D辑,2008,38(10):1186-1194.ZHANG Yong,FENG Wanpeng,XU Lisheng,et al.Spatial and temporal rupture process of the 2008 Wenchuan earthquake[J].Science in ChinaEarth Sciences,2008,38(10):1186-1194.(in Chinese)
[12]Youngs R R,Chiou S J,Silva W J,et al.Strong ground motion attenuation relationships for subduction zone earthquakes[J].Seism.Res.Lett.1997,68(1):58-73.
[13]王卫民,赵连锋,李娟,等.四川汶川8.0级地震震源过程[J].地球物理学报,2008,51(5):1403-1410.WANG Weiming,ZHAO Lianfeng,LI Juan,et al.Rupture process of the Ms8.0 Wenchuan earthquake of Sichuan,China[J].Chinese J.Geo-phys,2008,5(5):1403-1410.(in Chinese)
[14]http://www.cea.gov.cn/manage/html/8a8587881632fa5c0116674a018300cf/_content/08_08/29/1219979564089.html.
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