| 差分法计算地震动旋转分量 |
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| 引用本文： | 李栋青,王赟,孙丽霞.差分法计算地震动旋转分量[J].地球科学,2021,46(1):369-380. |
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| 作者姓名： | 李栋青 王赟 孙丽霞 |
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| 作者单位： | 中国地质大学地球物理与信息技术学院,北京 100083;中国地质大学地球物理与信息技术学院,北京 100083;中国地质大学地球物理与信息技术学院,北京 100083 |
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| 摘 要： | 旋转地震学是一门研究由地震、爆破以及工程振动等引起的地球介质运动的新兴学科.旋转运动的研究由来已久，但是由于缺少高精度的旋转分量地震仪，所以旋转运动的研究大多仅限于理论方面.差分法作为利用平动分量获取旋转分量的一种计算方法，在理论研究方面较为成熟，但是缺乏实际数据的验证.通过在对旋转运动研究现状充分调研的基础上，利用模拟数据和实测的爆炸源数据，对差分法进行了测试和分析.通过对比差分法计算的旋转分量和实测旋转分量的波形图、振幅谱和相位谱等，得出了在一定的误差允许范围内，差分法可以作为求取水平旋转分量（RX，RY）的替代方法的结论；同时，针对爆炸源的高频特性以及密集台阵观测的特点，对现有的差分法进行了改进，提出了一种精度更高的求取旋转分量的差分法.
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| 关 键 词： | 旋转地震学 差分法 平动分量 模拟数据 爆炸源 地球物理 |
| 收稿时间： | 2019-10-21 |
Calculating Rotational Components of Ground Motions by Finite Difference Method |
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| Li Dongqing,Wang Yun,Sun Lixia.Calculating Rotational Components of Ground Motions by Finite Difference Method[J].Earth Science-Journal of China University of Geosciences,2021,46(1):369-380. |
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| Authors: | Li Dongqing Wang Yun Sun Lixia |
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| Affiliation: | (School of Geophysics and Information Technology,China University of Geosciences,Beijing 100083,China) |
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| Abstract: | Rotational seismology is a new subject to study the motions of the earth's medium caused by earthquakes, blasting and environmental vibration in an all-round way. The study of rotational components of ground motion has a long history. However, there is no high-precision rotational component seismograph, so the study of rotational motions is usually limited to theoretical aspects. As an alternative method of calculating rotational components by translational components, the finite difference method is relatively mature in theoretical research, but its application in practical data is still less. Based on the full investigation of the research that studying the rotational motions, the finite difference method is tested and analyzed by using the simulated data and the recording explosive source data. By comparing the waveforms, amplitude spectra and phase spectra of the rotational components calculated by the finite difference method with thoserecorded, it is concluded that the finite difference method can be used as an effective alternative to calculate the horizontal rotational components (RX, RY) within an error allowable range. At the same time, in view of the high frequency characteristics of the explosive source and the dense array, we have improved the finite difference method and proposed a higher precision finite difference method for calculating rotational components. |
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| Keywords: | rotational seismology finite difference method translational component simulated data explosive source geophysics |
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