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近年大地震中具有双平稳段的强震动:识别及空间分布规律
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摘要
2008年汶川地震和2011年东日本大地震获得的强震动记录中均包含相当数量的具有双平稳段的记录,这一现象在之前历次地震的强震动记录中较少出现,其与这两次巨大地震共同具有的能量释放巨大、多断层破裂、断层长度大、破裂持续时间长等特点有关。论文首先用前期研究提出的一种具有双平稳段的分段函数强度包线模型来表征地震动能量的时间分布特征,并用最优化方法对模型参数进行了估计;然后,分别以随机抽取的10条具有单、双平稳段的强震记录的强度包线参数为训练样本,应用支持向量机技术对所有具有双平稳段的强震记录进行了识别;最后,根据识别结果,研究具有双平稳段强震记录沿断层的空间分布规律,为后续研究此类记录的工程特性奠定了基础。
A considerable number of ground motions presented an obvious double—plateau feature in time history curves during recent great earthquakes such as the 2008 Wenchuan earthquake and 2011 Tohoku earthquake,which is mainly due to multiple rupture,large zone and long duration of rupture process,huge energy release and Doppler effect.First,a piece—wised envelope function with double plateau proposed in previous study is used to describe the energy— time distribution of ground motions.Then,the envelope parameters of 10 double—plateau ground motions and 10 single — plateau ground motions randomly selected are used as training sample,and support vector machine is used to classify all the ground motions into two groups,i.e.,single — and double — plateau.Finally,the spatial distribution of double—plateau ground motions along the direction of ruptures are explored and discussed which lay the foundation for future research.
引文
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