[1] Velocity spectra from moderate-sized earthquakes were used to investigate the P wave attenuation structure in central Mexico. In particular, we included regional events with magnitudes in the range of 4.5 to 6.1 recorded from 2005 to 2007 on the Middle American Subduction Experiment (MASE) array, which consists of 100 broadband sensors across central Mexico from Acapulco to Tempoal, near th...

A lower mantle S-wave triplication with a S cd branch occurring between S and ScS has been recognized for many years with a variety of explanations. It is particularly strong when sampling regions beneath the circum-Pacific lower mantle fast velocity belt seen in global tomographic models where it has been modeled with a 2-3% jump in S-velocity. General properties are; (1) it tends to arrive ea...

to control the nonlinear numerical instability, throughout the time evolution of the eulerian form of the nonlinear rotating shallow water equations, it is necessary to add numerical diffusion to the solution. it is clear that, this extra numerical diffusion degrades the accuracy of the numerical solution and should be kept as small as possible. in a conventional approach a hyper-diffusion is u...

The basic scientific point of this paper is to draw the attention of researchers to new possibilities of differentiation of similar signals having different nature. One example of such kinds of signals is presented by seismograms containing recordings of earthquakes (EQ's) and technogenic explosions (TE's). EQ's are among the most dramatic phenomena in nature. We propose here a discrete stochas...

in this paper we investigate a nonlinear evolution model described by the rosenau-kdv equation. we propose a three-level average implicit finite difference scheme for its numerical solutions and prove that this scheme is stable and convergent in the order of o(τ2 + h2). furthermore we show the existence and uniqueness of numerical solutions. comparing the numerical results with other methods in...

SUMMARY Scattered seismic coda waves are frequently used to characterize small scale medium heterogeneities, intrinsic attenuation or temporal changes of wave velocity. Spatial variability these properties raises questions about the spatial sensitivity waves. Especially continuous monitoring perturbations using ambient noise led a demand for approaches image observed with An efficient approach ...

3D post-stack time migrated seismic data and a suite of composite well log from six wells drilled within the “AFUN” field Niger delta were used to effect detailed interpretation field. This was with view delineating architectural elements that control reservoir quality deepwater turbidite reservoir. The analyses done using Petrel software. LAS file logs imported into software as SEG.Y. data. Fa...

Attenuation is often significant during seismic wave propagation in the subsurface, leading to reduced resolution and narrower bandwidth of images. Traditional corrections for such effects are inverse-Q filtering deconvolution, which require a high signal-to-noise ratio (SNR) avoid noise boost-up. Here, we propose time-domain method offering advantages interpretational quality resulting Similar...

ABSTRACT Since its deployment at the surface of Mars, Seismic Experiment for Interior Structure (SEIS) instrument InSight mission has detected hundreds small-magnitude seismic events. In this work, we highlight some features two specific families: high-frequency (HF) and very-high-frequency (VF) We characterize shape energy envelopes HF VF events with parameters: (1) delay time td between onset...