Learn More
Observations of seismic waves from earthquakes at depths between 100 and 200 km beneath Japan show that the initial portion of the S-wave arrival has greater duration than can be accounted for by earthquake source-time duration. The observed long duration of S waves has been explained as being caused by multiple forward scattering around the ray path(More)
Black carbon (BC) particles accumulated in the Arctic troposphere and deposited on snow have been calculated to have significant effects on radiative forcing of the Arctic regional climate. Applying cluster analysis technique on 10-day backward trajectories, seven distinct transport pathways (or clusters) affecting Alert (82.5 • N, 62.5 • W), Nunavut in(More)
SUMMARY The distortion and limited resolution of the image are serious problems of single-frequency diffraction tomography. Mul-tlfrequency methods, such as the multifrequency backscattering tomography, can improve the resolution and image quality significantly. In this work, we extend the multifrequency backacat-tering tomography to the case of vertically(More)
The object of this project is aimed at development and application of a new 3D wave propagation and modeling method in complex heterogeneous media using one-way wave approximation to study many outstanding problems of regional wave propagation in the context of nuclear test monitoring. The great advantages of one-way propagation methods are the fast speed(More)
  • 1