The shaxi source code can be downloaded at the spice webpage. This approach uses the digital ebsd data to generate a numerical finiteelement grid and simulates the dynamic propagation of seismic waves through the measured 2d ebsdsection. The event could easily be one of the most tragic natural disasters in recent history. Gps solutions rtnet software was used for the ppp analysis and is also used for apex service. Propagation of seismic waves in atwood building, top view. Earthquakes generate four principal types of elastic waves. Openswpc an opensource seismic wave propagation code. Animations illustrating simple wave propagation concepts propagation. It illustrates how earthquake waves propagate through the earth.
Animations are provided to view wave propagation in a 3dimensional solid for compressional p, shear s, rayleigh r and love l waves. We will show that two types of solutions are possible, corresponding to compressional p and shear s waves. Animations for earthquake terms and concepts flash animations illustrating. The second animation at right shows the difference between the oscillatory motion of individual particles and the propagation of the wave through the medium. A series of animations is presented here, which show the way that seismic shear waves propagate through the mantle of the earth from an earthquake. Here is an animation of s wave amplification at san francisco due to the loma prieta earthquake. The animations below illustrate both the propogation of the wave as well as the motion of particles as the wave passes.
This is an acoustic wave propagation model, but by using s wave velocities, it provides an adequate though incomplete simulation of sh wave propagation. Surface wave, rayleigh and love, propagation animations. Seismic waves are usually generated by movements of the earths tectonic plates but may also be caused by explosions, volcanoes and landslides. Note that an s wave could also be horizontally polarized, meaning that particle motion would be in the y direction in the coordinate system of the animation, as opposed to the z direction for vertical polarization. An earthquake generates seismic waves that penetrate the earth as body waves p. Ebsdbased dynamic wave propagation model for studying seismic anisotropy. S waves, also called shear waves or secondary waves, move materials at right angles to the wave.
Jones seismic waves program works was produced by r. Wave propagation is any of the ways in which waves travel. The seismic wave equation using the stress and strain theory developed in the previous chapter, we now construct and solve the seismic wave equation for elastic wave propagation in a uniform whole space. Visualizing wave propagation file exchange matlab central.
Text books leave much to be desired regarding visualization of wave propagation since they are not animated. Wavefront is a programme for simulating 2d acoustic systems, with a particular emphasis on determining wavefront shapes at the mouths of horns. Seismic waves earthquakes discovering geology british. Waves can be differentiated by their frequency, amplitude, wavelength and speed of propagation. Modeling of seismic wave propagation at the scale of the earth on a large beowulf extended abstract dimitri komatitsch seismological laboratory california institute of technology pasadena, california. Global seismic wave propagation simulations were computed with the shaxi and psvaxi methods. Energy is released and travels through the earth in the form of seismic waves.
P waves, also called compressional waves or primary waves, move through material by squeezing and stretching the material in the same direction as the wave is moving. Codes for wave propagation and earthquake dynamics. One sees waves propagating out from the epicenter on a threedimensional view of the earth at the same time one sees waves propagating through a crosssectional view of the earth. The waveform animation gives an intuitive sense of the true wave propagation, including relative wave. 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. Seismic waves are waves of elastic energy, such as that transmitted by p waves and s waves, 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. The propagation of seismic waves in a 2d halfspace is a wellknown problem in numerical seismology and modeled by solving the p. The code runs on a number of platforms, from desktop workstations to. Is there any software or codes for modeling the seismic wave propagation in 3d random scattering media. This newly developed fdm simulation code for modeling of seismic wave propagation in heterogeneous viscoelastic media in 2d and 3d, openswpc, has wide applicability for seismological studies. These two types of waves can propagate through the interior of the earth and we will refer to them as waves. Modelling seismic wave propagation for geophysical imaging.
Animations are provided to view wave propagation in a. A wave set is a wave and some key waves that precede it. Wave propagation in the earth an earthquake emits elastic energy in the form of waves seismic waves. Founded in 2002 by nobel laureate carl wieman, the phet interactive simulations project at the university of colorado boulder creates free interactive math and science simulations. The solver may be used to simulate seismic wave propagation. Seismic waves viewer open resource seismic waves is a browserbased tool to visualize the propagation of seismic waves from historic earthquakes through earths interior and around its surface. Then the user can select go to start the animation or can select which stations to use and. Various algorithms are used to carry out elastic modeling of seismic wave propagation, allowing us to fully understand all aspects of the recorded information. The main seismic wave types are compressional p, shear s, rayleigh r and love l waves. Click anywhere to launch seismic waves and simulate an earthquake.
Seismic wave propagation in stratified media brian kennett. As a comparison to the wave animations, we also show the suite of shear waves in their more traditional manner of representation, which is done using geometric raytracing. Seismic wave propagation in a spherically symmetric earth model with a low velocity structure at the core mantle boundary. To model the seismic wave propagation in random media, what software or programming. We concatenated the frames into animations with the software mencoder using. This activity includes both the seismic waves viewer and the seismic eruption software to help learners better understand earthquakes, volcanoes, and the structure of the earth. Modeling of seismic wave propagation at the scale of the.
The calculation is based on numerical solution of equation for a complex phase of the wave. The waveform animation gives an intuitive sense of the true wave propagation, including relative wave amplitudes. Meshing is based upon the geometry and mesh generation toolkit cubit, and the acousticanelastic solvers are based upon sem. 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 an overview sciencedirect topics. We measure these waves with seismometers when they interact with. Displacements are color coded in order to see the propagation of seismic waves. Particle motion is parallel to the direction of propagation longitudinal.
Seismic waves viewer incorporated research institutions for. Seismic wave motions4 waves animated iris consortium. There were challenging logistics in planting and cabling them, and in their recording with three times the normal number of channels. Is there any software or codes for modeling the seismic. The package has a sequence of 6 models that have both a transient pulse excitation as well as a sine wave. The emphasis is on the propagation of seismic waves. This program is necessary to calculate of xrays wave focusing by xray microscope. The animations below illustrate both the propogation of the wave as well as the motion of. Seismic waves is a windows program which illustrates how waves propagate from an earthquake hypocenter to seismic stations throughout the earth. An earthquake generates a series of seismic waves that travel through the interior or near the surface of the earth. 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. Each wave has a characteristic speed and style of motion.
The world was shocked by the news of massive earthquakes and devastating tsunamis in japan. Earth can also be illustrated effectively using the simulation software seismic waves. This software simulate seismic wave propagation by solving equations of. Specfem3d sesame simulates seismic wave propagation in local models, e. Seismic wave animations are used to illustrate different types of wave propagation through elastic materials. Easytouse controls speedup, slowdown, or reverse the wave propagation. Animation of the recorded displacements of atwood building, anchorage, alaska during the m3. The wave is seen as the motion of the compressed region ie, it is a pressure wave, which moves from left to right. Seismic waves viewer incorporated research institutions. These highlight aftershocks and seismic wave propagation.
P and s waves are often called body waves because they propagate outward in all directions from a source such as an earthquake and travel through the interior of the earth. The software simulates wave propagation by solving the elastodynamic formulation of the full wave equation on a staggered grid. By carefully examining these seismic wave fronts and their propagation, the seismic waves tool illustrates how earthquakes can provide evidence that allows us to. Software development that made the production of these animations. This animation produced in conjunction with kqeds quest series, walks viewers through an easy to understand, playful introduction to earthquake basics and various different seismic waves. The animations below illustrate both the propogation of the wave as well as the motion of particles as the wave.
With respect to the direction of the oscillation relative to the propagation direction, we can distinguish between longitudinal wave and transverse waves. It accepts cad drawings in dxf format and produces animated displays of wave propagation as well as exporting various data as text files. Seismic waves are waves of energy that travel through the earths layers, and are a result of earthquakes, volcanic eruptions, magma movement, large landslides and large manmade explosions that give out. When an earthquake occurs, the shockwaves of released energy that shake the earth and temporarily turn soft deposits, such as clay, into jelly liquefaction are called seismic waves. The user can select from one of several earthquakes distributed with the program. The below animation shows the propagation of a vertically polarized s wave. Compressional wave p wave animation deformation propagates. Seismic wave, vibration generated by an earthquake, explosion, or similar energetic source and propagated within the earth or along its surface. Published by anu e press the australian national university canberra act 0200, australia. Material returns to its original shape after wave passes. Propagation of seismic wave animation ppp kinamatic solution for the great tohoku earthquake, m9.