in seismic exploration studies different types of techniques are used to recognize seismic features in terms of their temporal and spatial spectra. variations in frequency content are sensitive to subtle changes in reflection information (castro de matos et al., 2003). in this study the joint time-frequency analysis is used for seismic texture recognition. discrete wavelet transform (dwt) witho...

We present a method for registration of time-lapse seismic images based on the local similarity attribute. We define registration as an automatic point-by-point alignment of time-lapse images. Stretching and squeezing a monitor image and computing its local similarity to the base image allows us to detect an optimal registration even in the presence of significant velocity changes in the overbu...

Quantified balanced and restored crustal cross-sections across the NW Zagros Mountains are presented in this work integrating geological and geophysical local and global datasets. The balanced crustal cross-section reproduces the surficial folding and thrusting of the thick cover succession, including the near top of the Sarvak Formation (∼ 90 Ma) that forms the top of the restored crustal cros...

Abstract Cross masonry vaults are common structural elements in historical buildings. They largely diffused all European countries, including those characterized by higher levels of seismicity. Although they have been constructed for centuries, represent some the most vulnerable traditional architecture, especially with reference to horizontal loads. The understanding their behaviour under seis...

Previously published equations for diffraction tomography do not solve the “two and one-half dimensional problem” (point source illumination of two-dimensional geology) if sources and receivers are confined to linear arrays. In spite of this lack of a formal solution, useful images can be formed by the application of twodimensional formulas to such problems. The estimation of difference fields....

[1] We present results from the cross-correlations of seismic noise recordings among pairs of stations in the Parkfield network, California. When performed on many station pairs at short ranges, the noise correlation function (NCF) is the passive analog to a shot gather made with active sources. We demonstrate the presence of both a P-wave and a Rayleigh wave in the NCF. A time-frequency analys...

[1] We computed cross-correlations of seismic waves generated by Long-Period (LP) events in the frequency band [0.8–2.2 Hz]. The data were recorded in the vicinity of Mount St Helens (MSH) during an eruptive period from September to December 2004. The time symmetric coherent coda arrivals of the time-derivative of the cross-correlation function (DCF), resulting from scattering and topographic e...

In interferometric gravitational wave detectors such as LIGO, the mirrors are suspended on fine wires. In designs for advanced detectors, the pendulums where the mirrors hang have multiple stages with both horizontal and vertical soft spring constants. The pendulum frequencies (around or below 1 Hz) are much lower than the frequency with optimal sensitivity for gravitational waves (around 100 H...