3-D finite-difference simulation of seismic fault zone waves—Application to the fault zone structure of the Mozumi-Sukenobu fault, central Japan—

Continuity of subsurface fault structure revealed by gravity anomaly: the eastern boundary fault zone of the Niigata plain, central Japan

We have investigated gravity anomalies around the Niigata plain, which is a sedimentary basin in central Japan bounded by mountains, to examine the continuity of subsurface fault structures of a large fault zone—the eastern boundary fault zone of the Niigata plain (EBFZNP). The features of the Bouguer anomaly and its first horizontal and vertical derivatives clearly illustrate the EBFZNP. The s...

Structural evidence on strike slip Kinematic inversion of the Kushk-e-Nosrat Fault zone, Central Iran

NW-tending faults in Central Iran are expected to represent dominant dextral components due to their orientation with respect to the northward motion of the Arabian Plate with respect to Eurasia. However, previously published works, as well as the focal mechanism solution of the area's earthquakes, indicate evidence of sinistral kinematic along the major faults in Central Iran. Here we present ...

Fault compaction and overpressured faults: results from a 3-D model of a ductile fault zone

S U M M A R Y A model of a ductile fault zone is incorporated into a forward 3-D earthquake model to better constrain fault-zone hydraulics. The conceptual framework of the model fault zone was chosen such that two distinct parts are recognized. The fault core, characterized by a relatively low permeability, is composed of a coseismic fault surface embedded in a visco-elastic volume that can cr...

Constitutive properties of clayey fault gouge from the Hanaore fault zone, southwest Japan

[1] Velocity step tests at a range of slip rates (0.0154–155.54 mm s ) are performed using natural fault gouge containing smectite, mica, and quartz collected from an outcrop of the Hanaore Fault, southwest Japan. Field and microscopic observations reveal that the shear deformation is localized to a few centimeters or thinner layer of black clayey fault gouge. This layer is formed by multiple s...

Spatiotemporal patterns of fault slip rates across the Central Sierra Nevada frontal fault zone