Based on cross-correlations of ambient seismic noise computed using 61 ocean bottom seismometers (OBSs) within the Juan de Fuca (JdF) plate from the Cascadia Initiative experiment and 42 continental stations near the coast of the western United States, we investigate the locations of generation of the primary (11–20 s period) and secondary (5–10 s period) microseisms in the northern Pacific…

Tahun Terbit

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Tahun Terbit

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Based on 3-D finite difference method simulations of seismic wave propagation, we examined the processes by which the complex, scattered high-frequency (f > 1 Hz) seismic wavefield during crustal earthquakes is developed due to heterogeneous structure, which includes smallscale velocity inhomogeneity in subsurface structure and irregular surface topography on the surface, and compared with obse…

TheC-response is a conventional transfer function in global electromagnetic induction research and is traditionally determined from observations of magnetic variations in the vertical and horizontal components. Its interpretation relies on the assumption that the source of the variations is well approximated by a large-scale symmetric (magnetospheric) ring current, described by a single spheri…

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Tahun Terbit

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We used ab initio molecular dynamics to calculate the elastic constants of MgSiO3, FeSiO3 and (Fe0.5Mg0.5)SiO3 perovskite under lower-most mantle conditions (136 GPa, 2000–4000 K). At 0K, Vp and Vs for FeSiO3 perovskite are 12 and 18 per cent lower, respectively than those for MgSiO3, in agreement with previous work. The difference in velocity, however, increases with temperature for high sp…

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Tahun Terbit

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