Rupture Propagation beyond Fault Discontinuities: Effect of Depth-dependent Stress.

DOI Web Site 28 References
  • KASE Yuko
    Active Fault Research Center. National Institute of Advanced Industrial Science and Technology

Bibliographic Information

Other Title
  • 断層間での破壊の乗り移り　　応力が深さに依存する場合についての考察
  • ダンソウ カン デ ノ ハカイ ノ ノリウツリ オウリョク ガ フカサ ニ イゾン スル バアイ ニ ツイテ ノ コウサツ
  • Effect of Depth-dependent Stress
  • 応力が深さに依存する場合についての考察

Search this article

Abstract

Numerical simulations have revealed that a rupture jumps from one fault to another near the Earth's surface. We show that a rupture jump occurs at a deep portion under depthdependent stress. We investigated rupture behaviour at a gap region between two faults, by calculating spontaneous rupture processes on two parallel strike-slip faults in a 3-D elastic medium. Depth-dependent stresses introduced from the results of hydraulic fracturing experiments at the KTB site are assumed. The differential stress is assumed to be proportional to depth. The rupture processes under depth-dependent and uniform stress conditions are compared : similar rupture processes on the first fault, but different ones on the second fault are obtained. Under the depth-dependent stress condition, an upward rupture on the first fault can trigger a rupture at a deep portion of the second fault, because strength is reduced at shallower depths. Near the Earth's surface, a rupture on the second fault can be triggered by only a P-wave radiated from the first fault. Strength and stress drop heterogeneities on faults cause a rupture jump at a deep portion and the complexity of the rupture process. Our results suggest that the stress increase with depth is an important factor.

Journal

References(28)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top