Stress Distribution in the Vicinity of Right Strike-Slip Fault, a Numerical Approach

摘要

When fault exist in the formation, the local stressesin the shallow depth will be affected by presence of slip ordisplacement on fault and topography If the trace of fault is notstraight, the stress distribution near fault become morecomplicated. This feature is studied numerically using boundaryelement method. Related to this problem, a numerical procedure of2 and 3 dimensional coupled fictitious stress method anddisplacement discontinuity method which takes joint element intoconsideration is adopted. A sinusoidal fault trace is used tomodelize the non-straight strike-slip fault in 2 dimensions, while asinusoidal fault plane buried in the middle of symmetrical valley isused as numerical model study in 3 dimensions. This model is thenapplied to the Mozumi Sukenobe fault as field case study. Ourfinding on local stress near fault is consistent with fieldmeasurement. If the far field stress is defined in proportion todepth, our finding also predicts that the applied far field stress inthe Mozumi Sukenobe fault is in compression with ?Ho oriented at-40°from fault strike and the magnitudes of far field stresscomponents are ?vo≈?gh, ?HO≈0.74?vo and ?ho≈0.5?vo.