| 熊本MW7.0地震近场地表与井下地震动对比研究 |
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| 引用本文： | 罗诚,谢俊举,温增平.熊本MW7.0地震近场地表与井下地震动对比研究[J].地震学报,2018,40(1):108-120. |
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| 作者姓名： | 罗诚 谢俊举 温增平 |
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| 作者单位： | 中国北京 100081 中国地震局地球物理研究所 |
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| 摘 要： | 选取日本熊本MW7.0地震断层距小于200 km的82个近场KiK-net台站记录到的三分量记录数据进行基线校正后，获得近场地面运动水平向的峰值加速度PGA、峰值速度PGV及周期为0.2，1，2，3，5和10 s的加速度反应谱数据，并与美国NGA-West2的地震动预测模型相比较，研究熊本地震地表和井下地震动峰值及反应谱的衰减特征，通过比较KiK-net台站地表与井下记录结果，探讨浅层场地放大效应的影响。研究结果表明:① 对于井下观测结果，NGA-West2的地震动模型对PGA和短周期0.2 s的反应谱的预测值与井下观测值相比整体偏高，而PGV和较长周期地震动（如1，2和3 s的反应谱）的预测值与井下观测值较为吻合；② 地表观测记录的PGA，PGV和周期为0.2—3 s的反应谱残差整体上随vS30对数值的增大呈线性减小的趋势，而周期为5 s和10 s的长周期部分，其场地效应的影响很小；③ 相对于井下记录，地表记录的地震动PGA，PGV和周期为0.2，1和2 s的反应谱有明显的放大，这种放大作用随浅层场地剪切波速的增大而减小；周期为3，5和10 s时长周期地震动的放大效应很小。
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| 关 键 词： | 熊本地震 强地震动 近场 井下记录 |
| 收稿时间： | 2017-03-09 |
Comparison of near-field surface and borehole ground motion observed during the Kumamoto MW7.0 earthquake |
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| Affiliation: | Institute of Geophysics，China Earthquake Administration，Beijing 100081，China |
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| Abstract: | We used the records of 82 near-field strong motion stations （KiK-net）, which are within 200 km to the rupture fault of the Kumamoto MW7.0 earthquake, as database to derive near-field horizontal peak ground acceleration PGA, peak ground velocity PGV and spectra acceleration （period T=0.2, 1, 2, 3, 5, 10 s）, after baseline correction we further compared them with the NGA-West2 ground motion model predictions. We investigated the attenuation and residuals distribution characteristics of these intensity measures （IMs）, and shallow site-amplification effects by comparing surface and borehole ground motion records. The following conclusions can be drawn from our study: In the boreholes, NGA-West2 predictions are obviously greater than observations of PGA and T=0.2 s spectra acceleration, but close to the measured value in long-period IMs （spectra acceleration with T=1, 2, 3 s） and PGV. On surface, the residuals of observed PGV and T=0.2–3 s spectra acceleration show linear decrease tendency with the increase ofvS30, but the site effects affect little on the long-period spectra acce-leration. Surface records are greater than borehole in PGA, PGV and T=0.2, 1, 2 s spectra acceleration, and the amplification effects decrease with the increase of shallow site shear velocity; whereas the site amplification has little effects on the long-period spectra acceleration with T=3, 5, 10 s. |
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