High Pore Fluid Pressure May Cause Silent Slip in the Nankai Trough

Kodaira, Shuichi; Iidaka, Takashi; Kato, Aitaro; Park, Jin-Oh; Iwasaki, Takaya; Kaneda, Yasufumi

doi:10.1126/science.1096535

Cited by 467 publications

(409 citation statements)

References 22 publications

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“…Kuwano et al, 2011, submitted]. The latter pressure-dependent strengthening may play an important role in granular shear flows under low pressure such as landslides and fault motions at shallow depths in the accretionary prism and the high-fluid-pressure zone of the plate interface where slow slips occur [Kodaira et al, 2004].…”

Section: Discussionmentioning

confidence: 99%

Flash weakening is limited by granular dynamics

Kuwano

Hatano

2011

Geophys. Res. Lett.

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[1] We measured the steady-state friction coefficient of granite over a wide range of sliding velocities and pressures. We observed considerable weakening, described well by a flash-heating theory, above the sliding velocity of 1 cm/s regardless of pressure. At higher velocities, the velocity strengthening behavior replaced the velocity weakening behavior. This strengthening at higher velocities agrees with data from numerical simulations on sheared granular matter and is therefore described in terms of energy dissipation due to the inelastic deformation of grains. We propose a unified steady-state friction law that well describes the velocity and pressure dependence of the steady-state friction coefficient. Citation: Kuwano, O., and T. Hatano (2011), Flash weakening is limited by granular dynamics, Geophys. Res. Lett., 38, L17305,

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Section: Discussionmentioning

confidence: 99%

Flash weakening is limited by granular dynamics

Kuwano

Hatano

2011

Geophys. Res. Lett.

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“…In most cases, high Poisson's and V p /V s ratios have been interpreted as regions with a high fluid content or high pore pressure (Kodaira et al 2004;Audet et al 2009;Peacock et al 2011). An alternate and complementary hypothesis is that the high V p /V s ratio due to a low S-wave velocity can be related to a preferred mineral alignment in the medium, a process expected to be particularly marked in the case of serpentine (Mainprice & Ildefonse 2009;Bezacier et al 2010).…”

Section: Oceanic Crustmentioning

confidence: 99%

Crust and upper-mantle seismic anisotropy variations from the coast to inland in central and Southern Mexico

Ramírez‐Castellanos

Pérez‐Campos²,

Valenzuela³

et al. 2017

Geophysical Journal International

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S U M M A R YSubduction zones are among the most dynamic tectonic environments on Earth. Deformation mechanisms of various scales produce networks of oriented structures and faulting systems that result in a highly anisotropic medium for seismic wave propagation. In this study, we combine shear wave splitting inferred from receiver functions and the results from a previous SKS-wave study to quantify and constrain the vertically averaged shear wave splitting at different depths along the 100-station MesoAmerican Subduction Experiment array. This produces a transect that runs perpendicular to the trench across the flat slab portion of the subduction zone below central and southern Mexico. Strong anisotropy in the continental crust is found below the Trans-Mexican Volcanic Belt (TMVB) and above the source region of slow-slip events. We interpret this as the result of fluid/melt ascent. The upper oceanic crust and the overlying lowvelocity zone exhibit highly complex anisotropy, while the oceanic lower crust is relatively homogeneous. Regions of strong oceanic crust anisotropy correlate with previously found low V p /V s regions, indicating that the relatively high V s is an anisotropic effect. Upper-mantle anisotropy in the southern part of the array is in trench-perpendicular direction, consistent with the alignment of type-A olivine and with entrained subslab flow. The fast polarization direction of mantle anisotropy changes to N-S in the north, likely reflecting mantle wedge corner flow perpendicular to the TMVB.

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“…In addition, field evidence comes from earthquakes induced either through direct injection of fluids into boreholes or from the filling of large reservoirs with subsequent infiltration of water into the underlying rock mass [e.g., Healy et al, 1968;Raleigh et al, 1976]. Seismological observation indicates that subducting oceanic plates contain some amount of fluid [Kodaira et al, 2003]. Serpentines are generally regarded as a major carrier of fluid component in subducting plates, and their dehydration reactions will affect earthquake generation.…”

Section: Introductionmentioning

confidence: 99%

Postseismic quasi‐static fault slip due to pore pressure change on a bimaterial interface

Yamashita

2007

J. Geophys. Res.

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[1] We theoretically study the mechanism of afterslip, generally observed after the occurrence of large shallow earthquakes, taking account of poroelastic effects including fluid flow. A two-dimensional in-plane shear fault is assumed on a bimaterial interface that separates mechanically different poroelastic media. We first derive analytical expressions for the stress tensor components and fluid pressure as integrals of fault slip; the rigidity and diffusivity of the two media separated by the fault are assumed to be equal in value to derive the solution analytically. We then numerically solve these integral equations assuming stress boundary condition on the fault and obtain the spatiotemporal evolution of fault slip. The Coulomb failure criterion is assumed for the quasi-static growth of fault. We find that the positive feedback between the fluid pressure raised at the extending fault tip and evolving fault slip promotes the quasi-static fault tip extension; the amount of afterslip is found to be larger for smaller value of the Biot-Willis coefficient. It is also found that the poroelastic bimaterial effect favors unilateral extension of fault. Our calculations show that the patch of postseismic fault slip does not overlap that of coseismic slip significantly. We also observe a rapid decrease in postseismic moment release rate with time. These are in harmony with geodetic observation related to afterslips. We will have to resort to purely numerical analysis if we remove the assumptions about the rigidity and diffusivity; however, our present study can provide a reference point for such analysis.Citation: Yamashita, T. (2007), Postseismic quasi-static fault slip due to pore pressure change on a bimaterial interface, J. Geophys.

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High Pore Fluid Pressure May Cause Silent Slip in the Nankai Trough

Cited by 467 publications

References 22 publications

Flash weakening is limited by granular dynamics

Flash weakening is limited by granular dynamics

Crust and upper-mantle seismic anisotropy variations from the coast to inland in central and Southern Mexico

Postseismic quasi‐static fault slip due to pore pressure change on a bimaterial interface

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