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.

地壳中排列整齐的垂直裂缝可以方便地 通过S波地震测量学精确地观测到。 垂直传播 S波的移动速度略有不同，这取决于 S波的偏振相对于 骨折人群。 横波沿断裂面沿着极化 传播速度比垂直于排列方向极化的S波快 断裂面 S波速度差或S波分裂 类似于晶体中的双折射。