Accurate Three Dimensional Calculations for Advancing Slip Zones in the Earth's Crust

精确的三维计算以推进地壳中的滑移带

• 批准号: 8707392
• 负责人: John Rudnicki
• 金额: $ 17.76万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-02-01 至 1991-10-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8707392&HistoricalAwards=false
• 关键词: Accurate; Three; Dimensional; Calculations; Advancing

An accurate and efficient method for the three-dimensional analysis of cracks in elastic solids is applied to the study of quasi-statically advancing slip zones in the earth's crust. Calculations are done to determine stresses and surface deformations due to the advance of shear faults into and around locked, or more resistant, portions of the shallow crust. Of particular interest are conditions for which non-uniformities in the advancing front are unstable, in the sense that they give rise to rapid spontaneous propagation of slip, and conditions that may distinguish small from large earthquakes. These calculations also make it possible to relate measurements of surface deformation to increases in seismicity that may be triggered by the elevation of stresses that accompanies slip zone advance. Other effects considered are the possibility of breakout at the free surface and the coupling of normal and shear stress due to the presence of the free surface. Initial studies will be for strike-slip geometries for possible application to the Parkfield region of southern California, but the versatility of the method allows study of thrust-faults, as well.

一种精确有效的三维空间 弹性固体中裂纹的分析应用于研究 地壳中准静态前进的滑动带。 进行计算以确定应力和表面 由于剪切断层的推进而产生的变形 浅地壳的锁定或更有抵抗力的部分。 的 特别令人感兴趣的是， 前进的前线是不稳定的，在这个意义上，他们给了上升， 滑动的快速自发传播，以及可能 区分大地震和小地震。 这些计算还 使测量表面变形与 地震活动的增加可能是由海拔升高引发的， 伴随滑动带推进的应力。 其他效果 考虑了在自由表面发生破裂的可能性， 由于存在的正应力和剪应力的耦合， 自由表面 最初的研究将是走滑几何形状 可能适用于南部帕克菲尔德地区， 加州，但该方法的多功能性允许研究 逆冲断层也是。