Following the electric current injection experiment carried out in 2009, a VLF-MT (Very Low Frequency Magnetotelluric) survey has been conducted in Kozu-shima Island to obtain further information on the subterranean electrical structure that might help understanding the results of our monitoring of geoelectric potentials. A number of VAN-type pre-seismic geoelectric potential anomalies were obs...

seismic coherency is a measure of lateral changes in acoustic impedance that are caused by variations in structure, stratigraphy, lithology, porosity, and fluid content. seismic coherency is a geometrical attribute that establishes temporal and lateral relationships with other attributes. seismic coherency can be defined by coherency attributes. when coherency attributes are applied to seismic ...

0006-3207/$ see front matter 2012 Elsevier Ltd. A http://dx.doi.org/10.1016/j.biocon.2012.08.005 ⇑ Corresponding author. Address: Greenland Ins Strandgade 91, 3, DK-1016 Copenhagen, Denmark. T 32833801. E-mail address: [email protected] (M.P. Heide-Jørgen There is great interest in exploring and exploiting hydrocarbon resources in the Arctic, and one of themain methods of locating and assessing such...

We establish sharp L2-Sobolev estimates for classes of pseudodifferential operators with singular symbols [27, 20] whose non-pseudodifferential (Fourier integral operator) parts exhibit two-sided fold singularities. The operators considered include both singular integral operators along curves in R2 with simple inflection points and normal operators arising in linearized seismic imaging in the ...

Local seismic attributes measure seismic signal characteristics not instantaneously at each signal point and not globally across a data window but locally in the neighborhood of each point. I define local attributes with the help of regularized inversion and demonstrate their usefulness for measuring local frequencies of seismic signals and local similarity between different datasets. I use sha...

The assessment of seismic performance of existing structures is becoming an important problem in earthquake engineering. Some important ructures are considerably old and, therefore, their strengths and ductilities are less than strength and ductility demands because of changes in codes and design methodologies. Such structures must be strengthened to resist future earthquakes. First, a structur...

We summarize the recent development of our broad-range seismic and geophysical data processing system. The system implements a novel data handling and analysis framework, currently includes ~200 tools and allows inclusion of unlimited number and types of algorithms. It provides standardized input/output, common parameterization of all tools, common graphical look and feel, automated maintenance...

Wavefield propagation in an inhomogoneous medium is a complex phenomena, that must be understood if we are to extract information about both the sedimentary structures of prospective hydrocarbon provinces, and the elastic properties of the rocks and fluids of interest. A cursory examination of historically published “seismic survey planning” literature yields an overwhelming emphasis upon funda...

Right Copyright © 2009 John Wiley & Sons, Ltd.; This is the pre-peer reviewed version of the following article: Abbas Moustafa, Discussion of ‘A new approach of selecting real input ground motions for seismic design: The most unfavourable real seismic design ground motions’ by C-H Zhai and L-L Xie, Earthquake Engineering & Structural Dynamics, 38/9, 1143-1149, 2009, which has been published in ...