propagation of a plane wave
DESCRIPTION
Propagation of a Plane Wave. Plane Wave Approximation from a Spherical Front. Displacements for P and S waves. Radial and Transverse Motion of P and S Waves. Radial and Transverse Energy. N-S and EW components have nearly equal amplitude and energy (BAZ is 323 o ) - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Propagation of a Plane Wave](https://reader035.vdocuments.us/reader035/viewer/2022081503/56813595550346895d9d089f/html5/thumbnails/1.jpg)
Propagation of a Plane Wave
![Page 2: Propagation of a Plane Wave](https://reader035.vdocuments.us/reader035/viewer/2022081503/56813595550346895d9d089f/html5/thumbnails/2.jpg)
Plane Wave Approximation from a Spherical Front
![Page 3: Propagation of a Plane Wave](https://reader035.vdocuments.us/reader035/viewer/2022081503/56813595550346895d9d089f/html5/thumbnails/3.jpg)
Displacements for P and S waves
![Page 4: Propagation of a Plane Wave](https://reader035.vdocuments.us/reader035/viewer/2022081503/56813595550346895d9d089f/html5/thumbnails/4.jpg)
Radial and Transverse Motion of P and S Waves
![Page 5: Propagation of a Plane Wave](https://reader035.vdocuments.us/reader035/viewer/2022081503/56813595550346895d9d089f/html5/thumbnails/5.jpg)
Radial and Transverse Energy
N-S and EW components have nearly equal amplitude and energy (BAZ is 323o)
Rotate the seismogram to produce Radial and TransverseTransverse components
SKS and SKKS are P to Sv converted phases and are strongest on Radial
Sdiff has mostly Sh energy and is strongest on Transverse
![Page 6: Propagation of a Plane Wave](https://reader035.vdocuments.us/reader035/viewer/2022081503/56813595550346895d9d089f/html5/thumbnails/6.jpg)
Particle Motion
If we plot the particle motion for the Radial versus the Transverse component The SKS phase shows the most energy on the Radial The Sdiff phase shows the most energy on the Transverse
![Page 7: Propagation of a Plane Wave](https://reader035.vdocuments.us/reader035/viewer/2022081503/56813595550346895d9d089f/html5/thumbnails/7.jpg)
S wave delays
Note the S wave arrival times on the N-S and the E-W components.Are they coincident ?Why or Why not ?If you see a time delay or offset, what is causing this ?
![Page 8: Propagation of a Plane Wave](https://reader035.vdocuments.us/reader035/viewer/2022081503/56813595550346895d9d089f/html5/thumbnails/8.jpg)
Seismic and Mineral Anisotropy
![Page 9: Propagation of a Plane Wave](https://reader035.vdocuments.us/reader035/viewer/2022081503/56813595550346895d9d089f/html5/thumbnails/9.jpg)
![Page 10: Propagation of a Plane Wave](https://reader035.vdocuments.us/reader035/viewer/2022081503/56813595550346895d9d089f/html5/thumbnails/10.jpg)
P and S wave differences
![Page 11: Propagation of a Plane Wave](https://reader035.vdocuments.us/reader035/viewer/2022081503/56813595550346895d9d089f/html5/thumbnails/11.jpg)
Effects of Ground Composition on Seismic Energy
Seismometer ground displacements from 1989 Loma Prieta earthquake Magnitude 5 aftershock Seismometer on solid bedrock (above)Seismometer on filled land (below)
![Page 12: Propagation of a Plane Wave](https://reader035.vdocuments.us/reader035/viewer/2022081503/56813595550346895d9d089f/html5/thumbnails/12.jpg)