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Numerical modeling of elastic wave scattering by near-surface heterogeneities
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2013)
A perturbation method for elastic waves and numerical forward modeling are used to calculate the effects of seismic wave scattering from arbitrary shape shallow subsurface heterogeneities. Wave propagation is simulated ...
In Situ, Nonlinear Soil Response Applying an Active Source
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2009)
Soil sites have a profound effect on ground motion during earthquakes due to their low wave
speeds, layered structure, and nonlinear constitutive relationship. Measurements of nonlinear soil
response under natural ...
Sensitivity Analysis Of Amplitude Variation With Offset (Avo) In Fractured Media
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1998)
The variation in seismic P to P reflection amplitude with offset (AVO) caused by a
system of fractures embedded in an isotropic background is investigated. Additionally.
a sensitivity analysis of AVO parameters with ...
Finite Difference Elastic Wave Modeling Including Surface Topography
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2011)
Surface topography and the weathered zone (i.e., heterogeneity near the earth’s surface) have great effects on elastic wave propagation. Both surface waves and body waves are contaminated by scattering and conversion by ...
Numerical Modeling of Transport Properties and Comparison to Laboratory Measurements
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2008-06-10)
Transport properties, such as permeability and electrical conductivity, are important in many
geophysical and petroleum applications. The microstructure of a porous medium and physical
characteristics of the solid and ...
Simulating Shear Wave Propagation in Two-Dimensional Fractured Heterogeneous Media by Coupling Boundary Element and Finite Difference Methods
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2011)
A hybrid method to model the shear wave (SH) scattering from 2D fractures embedded in a heterogeneous medium is developed by coupling Boundary Element Method (BEM) and Finite Different Method (FDM) in the frequency domain. ...
Finite-Difference Simulations of Time Reversed Acoustics in a Layered Earth Model
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2007)
Traditionally an earthquake is located by using the arrival times of P and S phases. This uses only a limited portion of the information on a seismogram. A large part of the information carried by the waveform is not used. ...
Frequency-Domain Finite-Difference Acoustic Modeling with Free Surface Topography using Embedded Boundary Method
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2010)
In this paper, we present a method to model acoustic wave propagation in the frequencydomain
in the presence of free surface topography using the embedded boundary method. The
advantage of this method is to solve for the ...
A Numerical Study of the Effects of Wave-Induced Fluid Flow in Porous Media: Linear Solver
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2009)
In this paper, we present a computational method to simulate wave propagation in porous rocks saturated
with Newtonian fluids over a range of frequencies of interest. The method can use a digital representation
of a rock ...
Pore Scale Modeling of Rock Properties and Comparison to Laboratory Measurements
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2009)
The microstructure of a porous medium and the physical characteristics of the solid and fluid
phases determine the macroscopic transport properties of the medium. The purpose of this paper
is to test numerical calculations ...