Effects of Three-dimensional Inhomogeneous Viscoelastic Structures on Quasi-static Strain and Stress Fields Associated with Dislocation on a Rectangular Fault

Effects of Three-dimensional Inhomogeneous Viscoelastic Structures on Postseismic Surface Deformations Associated with the Great 1946 Nankaido Earthquake

“…As compared with P33 model, L33 model indicates larger horizontal displacement and dominance of downward surface displacement. This occurs because large stress relaxation in the former is limited in the wedge mantle due to the existence of the subducted oceanic plate, while in the latter stress relaxation occurs more extensively in the top asthenosphere just below the bottom of the fault (e.g., YOSHIOKA and SUZUKI, 1997).…”

Quaternary Volcanism Along the Volcanic Front in Northeast Japan

“…In addition, it is necessary to examine the effect of local crustal stress along the volcanic front on volcanism in stage 2. Local changes in crustal stress are attributable to: 1) the heterogeneity of differential stress caused by thermal structures (Watanabe et al, 1999); 2) a change in crustal stress near the faults caused by faulting (Yoshioka and Suzuki, 1997); and 3) the gravitational instability generated in uplifted mountain blocks (Moriya 1983;Molnar 1986). Watanabe et al (1999) pointed out that the heat spreading from magma reservoirs can produce a horizontal stress heterogeneity which could be lowered locally around the reservoirs, so that the regional crustal stress could be maintained at some distance from the reservoir.…”

“…According to Yoshioka and Suzuki (1997), when a dislocation is generated by a fault, a reverse fault type of stress field with σ v = σ 3 develops on upward and downward extensions of the fault plane, whilst a normal fault type of stress field with σ v = σ 1 occurs immediately above and below it. As mentioned above, active fault systems exist that are believed to reach the lower crust beneath the volcanic front and contribute to the uplifting of the Ou Backbone Range.…”