Detecting seismic waves using software defined radio. Seismic wave fields are recorded by a seismometer, hydrophone in water, or accelerometer. A data processing protocol was developed for processing seismic wave data for void detection by studying the signal simultaneously in the time and frequency domain using continuous wavelet transformation cwt. Codes for wave propagation and earthquake dynamics. The effect of voids in the soil media was examined by. The spectralelement method is implemented in the regional scale for a 3d integrated southern california velocity model.
Seismic waves are studied by geophysicists called seismologists. The emphasis is on the propagation of seismic waves in realistic earth models, and the way in which this can be understood in terms of the re. Swag,seismic wave analysis group,swag at kaust university,academic research group,geophysics,seismic,seismic exploration and production,seismic wave compressional p, shear s, rayleigh r and love l waves. These small elastic strains will propagate as waves away in. A periodic vibrational disturbance in which energy is propagated through or on the surface of a medium without translation of the material. Effects on localscale wave propagation due to lateral variations in compressionalwave speed, shearwave speed and density are studied using the. We present important extensions of the software seissol based on the arbitrary highorder discontinuous galerkin dg finiteelement method to model seismic. There is a diverse range of other acousticsrelated software available, both commercially and opensource. Global seismic wave propagation simulations were computed with the shaxi and psvaxi methods. By carefully examining these seismic wave fronts and their propagation, the seismic waves tool illustrates how earthquakes can provide evidence that allows us. We will show that two types of solutions are possible, corresponding. Based on data from three us earthquakes barenberg 1988 established an empirical relation between seismic wave propagation damage to cast iron pipe and peak horizontal particle velocity, vsub max. Each of the elements contains a few hundred points, solves the seismic wave equation on a local mesh and communicates the results of its computations to neighbors in the mesh.
Openswpc an opensource seismic wave propagation code. Pyfwi illustrates the propagation of seismic waves and the concept of seismic imaging. Seismic wave propagation an overview sciencedirect topics. The kwave toolbox is a powerful tool for general acoustic modelling. This book focuses on recent developments in the area of seismic wave propagation and scattering through the randomly heterogeneous structure of the earth, with emphasis on the lithosphere.
Various algorithms are used to carry out elastic modeling of seismic wave propagation, allowing us to fully understand all aspects of the recorded information. To model seismic wave propagation in the earth, we create a mesh of the globe, which we divide into a large number of slices see figures 1 and 2. Seismic wave animations for the p, s, rayleigh and love waves have been created using a 3d grid shown in figure 1. We present important extensions of the software seissol based on the arbitrary highorder discontinuous galerkin dg finiteelement method to model seismic wave propagation using nonconforming. Computational infrastructure for geodynamics software. Is there any software or codes for modeling the seismic wave. Pyfwi an interactive software for the simulation of seismic waves. Seismic wave propagation is a ground motion phenomenon that relates to the passage of body waves, including compression waves and shear waves, radially from the source of earthquake energy release hypocenter into the surrounding rock and soil medium. Ses3d is a program package for the simulation of elastic wave propagation and. Seismic waves are waves of elastic energy, such as that transmitted by pwaves and swaves, in the frequency range of approximately 1 to 100 hz.
Seismic waves is a browserbased tool to visualize the propagation of seismic waves from historic earthquakes through earths interior and around its surface. Specfem1d simulates seismic wave propagation in a onedimensional heterogeneous medium. Ground wave propagation, as know from radio signals, are different from the properties of seismic surface waves. Seismic reflection is one of the most popular methods in geophysical prospecting. We have developed an opensource software package, opensource seismic wave propagation code openswpc, for parallel numerical. The second type, or waves s, consists of wave propagation of shear, where the particles move in a direction perpendicular to the direction of propagation of the disturbance figure b. The geomechanics code is run in a multistage approach in which the static, dynamic and seismic stage are connected and coupled to the seismic wave propagation code. Waves can be differentiated by their frequency, amplitude, wavelength and speed of propagation. Earthquakes generate four principal types of elastic waves. A parallelserial 2d spectral element code for wave propagation. Free geophysical softwares seismic wave analysis group. Compression waves cause compressive and tensile strains in the ground in a radial direction away from the hypocenter. Probabilistic seismic hazard map calculations using 3d.
Wpp wave propagation program is the predecessor of sw4. Simulation of induced seismic ground motions using coupled. The propagation velocity of seismic waves depends on density and elasticity of the medium as well as the type of wave. The software simulates wave propagation by solving the elastodynamic formulation of the full wave equation on a staggered grid. A hybrid, finitedifference technique was developed for modeling nonlinear soil amplification from threedimensional, finite. Seismic waves viewer incorporated research institutions. Significantly better waveform fits are achieved for the 3d synthetics calculated compare to the 1d synthetics. Modeling of seismic wave propagation at the scale of the. A matlab toolbox for the time domain simulation of. Seismic unix project is used not only in seismology but in other areas involving timedependent data, such as ground penetrating radar. Seissol is a software package for simulating wave propagation and dynamic rupture based. The program is designed for computation of seismic wavefields in. The solver may be used to simulate seismic wave propagation on regional and local scales.
Additional data from the 1983 coalinga earthquakes and two mexican earthquakes suggest that damage. Modelling seismic wave propagation for geophysical imaging 10 willbesetbyintech from a maximum value. The first of them, called pwaves, consists of the transmission of compressions and rarefacciones of rock, similar to the propagation of the sound figure a. Seismic wave propagation simulations on lowpower and. Seismic wave, vibration generated by an earthquake, explosion, or similar energetic source and propagated within the earth or along its surface. Modelling seismic wave propagation for geophysical imaging. Meshing is based upon the geometry and mesh generation toolkit cubit, and the acousticanelastic solvers are based upon sem.
Opentoast toolbox for applied seismic tomography software. For the numerical simulation of 2d earthquake dynamics, the spectral boundary integral equation code bimat is well suited for planar faults in homogeneous and bimaterial media, and the spectral element code sem2dpack is well suited for nonplanar faults in heterogeneous or nonlinear media. In our implementation, tetrahedral elements are used which allows for a better fit of the geometrical constraints of the problem, i. The resulting ground motion collection will be processed, using sceccme software tools, into probabilistic seismic hazard maps for the region under study. Here, a generic coupled modelling approach is described in which an arbitrary geomechanical and seismic wave propagation codes can be coupled see scheme in fig. The method is implemented using mpi on a large pc cluster beowulf with 151 processors and 76 gb of ram. Specfem3d sesame simulates seismic wave propagation in local models, e. Highly efficient implementations for seismic wave propagation in 1d structures are provided as well as computationally demanding numerical solvers for full 3d. Easytouse controls speedup, slowdown, or reverse the wave propagation.
We gratefully acknowledge the support of the german research foundation dfg by crc 1173 in the subprojects on numerical wave propagation and seismic. There are many opensource seismic reflection data processing software programs available. The flexwin software package automates the timewindow selection problem for seismologists. Nevertheless, obtaining high resolution and accurate results requires a sophisticated processing stage. Abstract we have developed an opensource software package, opensource seismic wave propagation code openswpc, for parallel numerical simulations of seismic wave propagation in 3d and 2d psv and sh viscoelastic media based on the finite difference method in localtoregional scales. Seismic wave propagation in a spherically symmetric earth model with a low velocity structure at the core mantle boundary. An interesting coincidence is that wavelengths can be in the same magnitude, but that is because radio waves progress about 100. The shaxi source code can be downloaded at the spice webpage. Pipeline damage due to wave propagation journal article. It is based upon a weak formulation of the equations of motion and combines the. Simulation results can be used to determine signal propagation, path loss, delay spread and channel impulse response. It discretizes the seismic wave equations using a second order accurate numerical method that satisfies the principle of summation by parts, npsk07. Seissol is a software package for simulating wave propagation and dynamic. For regional and local earthquake studies, the research group uses the spectralelement method sem to simulate the influence of 3d uppermantle and crustal structure upon seismic wave propagation.
A scientific software for the numerical simulation of seismic wave phenomena. Modeling seismic wave propagation on a 156gb pc cluster. Seplib bsdstyle license, maintained by bob clapp at the stanford exploration project sep. This software simulate seismic wave propagation by solving equations of motion with constitutive equations of elasticviscoelastic medium by finite difference method fdm under message passing interface mpi environment in 3d and 2d psv or sh media. The wave animations illustrate wave characteristics and particle motion as listed in table 1.
Ses3d is a free open source software released under apache 2. Seismic unix bsdstyle license, maintained by john stockwell center for wave phenomena, colorado school of mines madagascar is an opensource software package for multidimensional data analysis and reproducible computational experiments. We have developed an opensource software package, opensource seismic wave propagation code openswpc, for parallel numerical simulations of seismic wave propagation in 3d and 2d psv and sh viscoelastic media based on the finite difference method in localtoregional scales. However, this doesnt mean its the best tool for every purpose. This thesis presents a concise introduction to the spectralelement method and its applications to the simulation of seismic wave propagation in 3d earth models. Seismic wave propagation simulations on lowpower and performancecentric manycores marcio castroa, emilio francesquinib, fabrice dupros c, hideo aochi, philippe o. The cwpsu seixmic unx su package is a software environment for seismic processing and seismic and wavepropagation related research. All wave types are designed to propagate in the x direction illustrated in figure 1 and parallel to the earths surface. To model the seismic wave propagation in random media, what software or programming code is most efficient. We present highperformance simulations of global seismic wave propagation with an unprecedented accuracy of 1.
Seismic wave propagation modeling technical report. The presentation combines information from many sources to present a coherent introduction to the theory of scattering in acoustic and elastic materials and. A few potential applications of the ewave program can be. Opensource software seismic wave analysis group swag. Seissol a software for seismic wave propagation simulations.
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