Surface wave, rayleigh and love, propagation animations. Then the user can select go to start the animation or can select which stations to use and. 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. 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.
Propagation of seismic waves in atwood building, top view. The user can select from one of several earthquakes distributed with the program. 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. Wave propagation is any of the ways in which waves travel.
Seismic wave motions4 waves animated iris consortium. The emphasis is on the propagation of seismic waves. The calculation is based on numerical solution of equation for a complex phase of the wave. Wavefront is a programme for simulating 2d acoustic systems, with a particular emphasis on determining wavefront shapes at the mouths of horns. Here is an animation of s wave amplification at san francisco due to the loma prieta earthquake. This is an acoustic wave propagation model, but by using s wave velocities, it provides an adequate though incomplete simulation of sh wave propagation. A wave set is a wave and some key waves that precede it. Animations for earthquake terms and concepts flash animations illustrating. The below animation shows the propagation of a vertically polarized s wave. Text books leave much to be desired regarding visualization of wave propagation since they are not animated. Visualizing wave propagation file exchange matlab central. S waves, also called shear waves or secondary waves, move materials at right angles to the wave.
Seismic wave, vibration generated by an earthquake, explosion, or similar energetic source and propagated within the earth or along its surface. We measure these waves with seismometers when they interact with. Seismic wave propagation in stratified media brian kennett. An earthquake generates seismic waves that penetrate the earth as body waves p.
Propagation of seismic wave animation ppp kinamatic solution for the great tohoku earthquake, m9. Modeling of seismic wave propagation at the scale of the. Animations are provided to view wave propagation in a. Codes for wave propagation and earthquake dynamics. Seismic wave animations are used to illustrate different types of wave propagation through elastic materials. Seismic waves are usually generated by movements of the earths tectonic plates but may also be caused by explosions, volcanoes and landslides. The solver may be used to simulate seismic wave propagation. Wave propagation in the earth an earthquake emits elastic energy in the form of waves seismic waves. Iris authored software community authored software. Animations are provided to view wave propagation in a 3dimensional solid for compressional p, shear s, rayleigh r and love l waves. The waveform animation gives an intuitive sense of the true wave propagation, including relative wave. The animations below illustrate both the propogation of the wave as well as the motion of particles as the wave passes.
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 is a browserbased tool to visualize the propagation of seismic waves from historic earthquakes through earths interior and around its surface. 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. 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. Earthquakes generate four principal types of elastic waves. 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. Is there any software or codes for modeling the seismic wave propagation in 3d random scattering media. There were challenging logistics in planting and cabling them, and in their recording with three times the normal number of channels. Compressional wave p wave animation deformation propagates.
The animations below illustrate both the propogation of the wave as well as the motion of. Energy is released and travels through the earth in the form of seismic waves. The shaxi source code can be downloaded at the spice webpage. We will show that two types of solutions are possible, corresponding to compressional p and shear s waves. Ebsdbased dynamic wave propagation model for studying seismic anisotropy. Seismic wave propagation in a spherically symmetric earth model with a low velocity structure at the core mantle boundary. 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. This software simulate seismic wave propagation by solving equations of. Animation of the recorded displacements of atwood building, anchorage, alaska during the m3. The event could easily be one of the most tragic natural disasters in recent history.
These two types of waves can propagate through the interior of the earth and we will refer to them as waves. 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. Seismic waves viewer incorporated research institutions for. 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. Earth can also be illustrated effectively using the simulation software seismic waves. The world was shocked by the news of massive earthquakes and devastating tsunamis in japan. We concatenated the frames into animations with the software mencoder using. It illustrates how earthquake waves propagate through the earth. For the numerical simulation of 2d earthquake dynamics, the spectral boundary integral equation code bimat is well suited for planar faults in. 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.
Various algorithms are used to carry out elastic modeling of seismic wave propagation, allowing us to fully understand all aspects of the recorded information. Easytouse controls speedup, slowdown, or reverse the wave propagation. Seismic waves earthquakes discovering geology british. Each wave has a characteristic speed and style of motion.
The propagation of seismic waves in a 2d halfspace is a wellknown problem in numerical seismology and modeled by solving the p. It accepts cad drawings in dxf format and produces animated displays of wave propagation as well as exporting various data as text files. By carefully examining these seismic wave fronts and their propagation, the seismic waves tool illustrates how earthquakes can provide evidence that allows us to. 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 software simulates wave propagation by solving the elastodynamic formulation of the full wave equation on a staggered grid. 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. Published by anu e press the australian national university canberra act 0200, australia. The animations below illustrate both the propogation of the wave as well as the motion of particles as the wave.
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. 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. Wave propagation is a natural phenomenon that is important in many physical systems. Particle motion is parallel to the direction of propagation longitudinal. An earthquake generates a series of seismic waves that travel through the interior or near the surface of the earth. Seismic waves viewer incorporated research institutions. The waveform animation gives an intuitive sense of the true wave propagation, including relative wave amplitudes. 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. Material returns to its original shape after wave passes. Seismic waves is a windows program which illustrates how waves propagate from an earthquake hypocenter to seismic stations throughout the earth. Specfem3d sesame simulates seismic wave propagation in local models, e. 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.
Animations illustrating simple wave propagation concepts propagation. Displacements are color coded in order to see the propagation of seismic waves. The code runs on a number of platforms, from desktop workstations to. With respect to the direction of the oscillation relative to the propagation direction, we can distinguish between longitudinal wave and transverse waves. Animations of seismic wave propagation home university of utah. Gps solutions rtnet software was used for the ppp analysis and is also used for apex service. Seismic wave propagation an overview sciencedirect topics. The second animation at right shows the difference between the oscillatory motion of individual particles and the propagation of the wave through the medium. In this paper we describe a new numerical approach for the. Waves can be differentiated by their frequency, amplitude, wavelength and speed of propagation. Software development that made the production of these animations.
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. Openswpc an opensource seismic wave propagation code. 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. Modelling seismic wave propagation for geophysical imaging. Global seismic wave propagation simulations were computed with the shaxi and psvaxi methods. To model the seismic wave propagation in random media, what software or programming. Jones seismic waves program works was produced by r. This thesis presents a concise introduction to the spectralelement method and its applications to the simulation of seismic wave propagation in 3d earth models. This program is necessary to calculate of xrays wave focusing by xray microscope. 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 codes of subprograms in c, which simulate the xrays wave propagation through berillium lenses and air.
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