北京大学学报自然科学版 ›› 2022, Vol. 58 ›› Issue (4): 615-625.DOI: 10.13209/j.0479-8023.2022.044

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虚拟地震台阵双差测深法及应用

鲍铁钊1, 宁杰远1,2,†    

  1. 1. 北京大学地球与空间科学学院, 北京 100871 2. 河北红山地球物理国家野外科学观测研究站, 邢台 054000
  • 收稿日期:2021-05-28 修回日期:2021-06-25 出版日期:2022-07-20 发布日期:2022-07-20
  • 通讯作者: 宁杰远, E-mail: njy(at)pku.edu.cn
  • 基金资助:
    国家自然科学基金(41874071)和地震行业科研专项经费(201408013)资助 

Array-Based Double Difference Virtual Deep Seismic Sounding Method and Its Application

BAO Tiezhao1, NING Jieyuan1,2,†   

  1. 1. School of Earth and Space Sciences, Peking University, Beijing 100871 2. Hebei Hongshan National Geophysical Observation and Research Station, Xingtai 054000
  • Received:2021-05-28 Revised:2021-06-25 Online:2022-07-20 Published:2022-07-20
  • Contact: NING Jieyuan, E-mail: njy(at)pku.edu.cn

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摘要：

提出虚拟地震台阵双差测深法。通过多道互相关, 测量密集观测台阵中相邻台站间SsPmp波与Ss波到时差的差值, 然后求解最小二乘意义下每个台站SsPmp波与Ss波的到时差。该方法利用台阵优势, 可以有效地降低到时差测量误差, 有利于准确地估计地壳厚度。将该方法应用在模拟数据和“中国地震科学台阵探测计划”台阵数据上, 测量精度显著提高。

关键词: 虚拟地震测深法(VDSS), 台阵, 多道互相关, 双差, Ss到时异常

Abstract:

Through multi-channel cross-correlation, the differences of arrival time differences of SsPmp and Ss between adjacent stations in dense broadband seismic array are measured, and then arrival time differences of SsPmp and Ss of each station are obtained by means of least squares. This method is an advanced virtual deep seismic sounding (VDSS) method and named Array-Based Double Difference Virtual Deep Seismic Sounding (ABDDVDSS) method, which effectively reduces arrival time difference error and estimates crustal thickness precisely by taking advantages of array data. This method is applied to synthetic data and ChinArray II data. Results show that the proposed method can significantly improve the precision of measurement.

Key words: virtual deep seismic sounding (VDSS), array, multi-channel cross-correlation, double difference, Ss arrival time anomaly

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