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地震 ›› 2013, Vol. 33 ›› Issue (4): 64-70.

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YRY-4型钻孔应变仪观测的P波剪应变

邱泽华1, 池顺良2   

  1. 1.中国地震局地壳应力研究所, 北京 100085;
    2.河南省鹤壁地震局, 河南 鹤壁 458000
  • 收稿日期:2013-01-11 修回日期:2013-06-10 发布日期:2020-09-27
  • 作者简介:邱泽华(1959-), 男, 北京市人, 研究员, 主要从事地震以及钻孔应变观测研究。
  • 基金资助:
    地震行业科研专项(201108009)资助

Shear Strains of P Wave Observed with YRY-4 Borehole Strainmeter

QIU Ze-hua1, CHI Shun-liang2   

  1. 1. Institute of Crustal Dynamics, CEA, Beijing 100085, China;
    2. Hebi Seismological Bureau,Henan Hebi 458000, China
  • Received:2013-01-11 Revised:2013-06-10 Published:2020-09-27

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摘要： 传统地震仪观测的是一个点的位移随时间的变化, 而应变仪观测的是位移的空间导数随时间的变化。 在四川姑咱台用YRY-4型四分量钻孔应变仪进行的每秒100次采样观测实验, 记录到三次地方震。 在这样高的采样率下, YRY-4型四分量应变仪观测数据保持了令人满意的自洽和足够高的信度。 观测表明, P波的应变不仅有面应变成分, 而且有剪应变成分。 这为澄清P波的性质, 给出了直接的观测证据。 根据弹性波理论, P波无旋转, 可以有体应变和剪应变成分。

关键词: 四分量钻孔应变仪, 地震波的应变变化, P波, S波, 自洽性检验

Abstract: While a traditional seismograph records the variations of displacement with time at a point, a tensor strainmeter monitors the variations of the spacial gradient of displacement. An YRY-4 borehole strainmeter at Guza, Sichuan province, recorded three local seismic events at the sampling rate of 100 sps for the first time. At this high sampling rate, the data of the YRY-4 demonstrated a satisfying degree of self-consistency and sufficiently high credibility. The observation shows that P wave strain contains areal strain components as well as shear strain component. It gives direct evidence for the property of P wave. According to the theory of seismology, P wave is clarified to have no rotation, but it has volumetric strain and shear strains.

Key words: Seismic wave strain, YRY-4 borehole strainmeter, P wave, S wave

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