• 责任者：Qiu Zehua (Institute of Crustal Dynamics ; CEA ; Beijing 100085 ; China) ; Chi Shunliang
• 刊名：Earthquake
• 出版年：2013
• 卷期：33(4)
• 关键词：剪应变 ; shear strain ; 地震预测 ; earthquake prediction
• 页码：p.64-70
• 图表：5 illus., 1 table, 12 refs.
• 分类号：0500
• issnNo：ISSN1000-3274
• isbnNo：CN11-1893/P

     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.