A modified reconstruction algorithm for Fresnel volume tomography
Grandjean and Sage (2004) have presented a 2D seismic tomography software for estimating the velocity field using the first arrival traveltimes in paper ‘‘JaTS: A fully portable seismic tomography algorithm based on Fresnel wavepaths and a probabilistic reconstruction approach’’, Computers & Geosciences 30 (2004) 925–935. Unfortunately, the reconstruction algorithm includes errors in the paper. I correct the errors and present a modified reconstruction algorithm for Fresnel volume tomography.
Static corrections in mountainous areas using Fresnel-wavepath tomography
Abstract We propose a 3-D Fresnel-wavepath tomography based on simultaneous iterative reconstruction technique (SIRT) with adaptive relaxation factors, in order to obtain effective near-surface velocity models for static corrections. We derived a formula to calculate the optimal relaxation factor for tomographic inversion to increase the convergence rate and thus the efficiency of the Fresnel-wavepath tomography. A forward method based on bilinear traveltime interpolation and the wavefront group marching is applied to achieve fast and accurate computation of the wavefront traveltimes in 3-D heterogeneous models. The new method is able to achieve near-surface velocity models effective in estimating long-period static corrections, and the remaining traveltime residuals after the tomographic inversion are used to estimate the short-period static corrections via a surface-consistent decomposition. The new method is tested using 3-D synthetic data and 3-D field dataset acquired in a complex mountainous area in southwestern China.
Religion, Law and Society
Issues concerning religion in the public sphere are rarely far from the headlines. As a result, scholars have paid increasing attention to religion. These scholars, however, have generally stayed within the confines of their own respective disciplines. To date there has been little contact between lawyers and sociologists. Religion, Law and Society explores whether, how and why law and religion should interact with the sociology of religion. It examines sociological and legal materials concerning religion in order to find out what lawyers and sociologists can learn from each other. A groundbreaking, provocative and thought-provoking book, it is essential reading for lawyers, sociologists and all who are interested in the relationship between religion, law and society in the twenty-first century.