Borehole Seismic Investigations of Fractures in Crustal Stress Regimes

地壳应力状态下裂缝的钻孔地震研究

• 批准号: 8720785
• 负责人: Peter Leary
• 金额: $ 6万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-03-01 至 1989-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8720785&HistoricalAwards=false
• 关键词: Borehole; Seismic; Investigations; Fractures; Crustal

Aligned vertical fractures in the crust may be conveniently and accurately observed by S-wave seismometry. Vertically propagating S-waves move at slightly different speeds depending upon the polarization of the S-waves with respect to the alignment of the fracture population. S-waves polarized along the fracture faces propagate faster than do S-waves polarized normal to aligned fracture faces. The S-wave speed differential or S-wave splitting is analogous to birefringence in crystals.

可以方便，准确地观察到地壳中的垂​​直裂缝。 垂直传播的S波以略有不同的速度移动，这取决于S波相对于断裂群的比对的极化。 S波沿裂缝面的极化速度比S波偏振正常到对齐的裂缝面的速度快。 S波速度差异或S波分裂类似于晶体中的双折射。