Λεπτομέρειες βιβλιογραφικής εγγραφής
| Τίτλος: |
Frequency-Bessel surface-integration method to extract full set of dispersion spectrograms from seismic records of an earthquake event. |
| Alternate Title: |
面积分的频率-贝塞尔变换方法从地震事件记录中提取全套频散谱. |
| Συγγραφείς: |
Li, Changcheng1,2, Ren, Hengxin1,2,3,4 renhx@sustech.edu.cn, Shi, Caiwang1,5, Li, Zhengbo1,2,3,4, Chen, Xiaofei1,2,3,4 |
| Πηγή: |
Earthquake Science. Oct2026, Vol. 39 Issue 5, p555-577. 24p. |
| Θεματικοί όροι: |
Rayleigh waves, Signal processing, Seismograms, Seismic waves |
| Abstract (English): |
Dispersion curves are widely used to constrain lithospheric structures. Existing methods are capable of extracting overtone dispersion curves from both ambient noise and earthquake data to some extent. However, when applied to earthquake records with broad azimuthal station coverage, the azimuthal-dependent radiation pattern of seismic sources may lead to inaccurate measurements of dispersion curves. To theoretically address this azimuthal effect introduced by the earthquake source radiation pattern, this study introduces the concept of surface integration into the frequency-Bessel (F-J) framework. Starting from the semi-analytical expressions of seismic wavefields, we derive a full set of dispersion spectrograms that include contributions from Rayleigh waves, Love waves, and leaking modes. Synthetic tests demonstrate that surface integration can improve the effects from source radiation pattern. To accommodate realistic array deployments with irregular station distributions, we implement a discretized version of surface integration based on triangular subarrays. Applications to both synthetic and real earthquake data validate our method's ability in extracting comprehensive dispersion spectrograms from earthquake event records. Applications to both synthetic and real data validate the method's effectiveness in extracting the full set of dispersion spectrograms from earthquake records. By incorporating multiple spectrograms and combining with a mode separation strategy, the proposed method enables robust extraction of multimode dispersion curves. This extended F-J framework offers a flexible tool for analyzing diverse dispersion characteristics and holds promise for improving subsurface imaging by providing more complete and reliable structural constraints. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
频散曲线可以有效地约束圈层（岩石圈）速度结构。现有的方法可以在一定程度上有效地从背景噪声和地震记录中提取 出高阶（overtone）频散曲线。需要注意的是, 天然地震记录需要考虑地震源辐射花样的方位角各向异性给频散谱的提取 造成的干扰;当台阵环绕布设在震源四周的情况下, 这种来自震源的干扰会更加明显。本研究将"曲面积分"引入到频 散分析的频率-贝塞尔（F-J）变换法框架中, 理论上可以消除地震源辐射花样带来的影响。. 我们从地震波场的半解析表达式出发, 推导出了能提取全套频散谱的表达式;其中不仅包含了可以表征瑞雷波 （Rayleigh波）和勒夫波（Love波）的频散谱表达式, 还涵盖了能表征泄漏模式（leaking modes）的频散谱表达式。合成 数据测试的结果表明, 面积分的引入能够显著改善源辐射花样带来的干扰。针对实际情景中台阵分布不规则的复杂情况 , 我们基于将台站离散划分的思路实现了面积分的离散化计算;在本研究中我们以德劳内三角划分来实现面积分的离散 化计算。. 在实测地震数据的测试中, 我们成功地从2011年俄克拉荷马州W5.7级地震和2008年内华达州W6.0级地震的实测数据中有 效地提取了清晰易识别的全套频散谱。进一步地, 通过结合基于频散补偿的模式分离方法, 我们的方法能够稳定地从全 套地频散谱中提取各频散谱中的高阶频散曲线。. 我们改进的F-J方法为提取多分量多模式的频散曲线工作提供了新的思路, 更完整、可靠的结构约束, 可以进一步提升 地下介质成像的精度。. [ABSTRACT FROM AUTHOR] |
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