The source-time function of megaton class nuclear explosions has been determined by modeling teleseismic shortand long-period body waves with synthetic seismograms. A simple analytic expression for the time function was used to closely match observations from both Novaya Zemlya and the U.S. test site at Amchitka. It was found that the time functions of all the events have a substantial overshoo...

[1] The cross-correlation of multicomponent ambient seismic noise can reveal both the velocity and polarization of surface waves propagating between pairs of stations. We explore this property to develop a novel method for determining the horizontal orientation of ocean bottom seismometers (OBS) by analyzing the polarization of Rayleigh waves retrieved from ambient noise crosscorrelation. We de...

We simulate dynamic ruptures on a strike-slip fault in homogeneous and layered half-spaces and on a thrust fault in a layered half-space. With traditional friction models, sliding friction exceeds 50% of the fault normal compressive stress, and unless the pore pressures approach the lithostatic stress, the rupture characteristics depend strongly on the depth, and sliding generates large amounts...

[1] The deployment of USArray across the continental U.S. has prompted developments within surface wave tomography to exploit this unprecedented data set. Here, we present a method to measure a new surface wave observable: broadband surface wave amplification that provides new and unique constraints on elastic velocities and density within the crust and upper mantle. The method, similar to its ...

This study presents reflectivity images of the northeast (NE) Japan subduction zone continuous across ocean and land. As nearly half its forearc region is under ocean, data from bottom seismometers (OBSs) must be utilized to fully image by passive seismic analysis. The use OBS has been a challenge due inherent characters observations: high noise level effects seafloor sediment. Now, decent imag...

We constrain olivine fabrics in the oceanic lithosphere using active and passive seismic observations of Pn azimuthal anisotropy. first analyze active-source data derived from a broadband ocean bottom seismometer array that was deployed Northwestern Pacific. infer dependence velocity, including 2ϕ 4ϕ terms sinusoidal functions, where ϕ is back azimuth. observe skewed with large peak-to-peak amp...