AN AMPLITUDE STUDY ON A SEISMIC MODEL

Geophysics ◽  
1955 ◽  
Vol 20 (4) ◽  
pp. 766-773 ◽  
Author(s):  
C. S. Clay ◽  
Halcyon McNeil
Keyword(s):  
Plane Wave ◽  
Wave Reflection ◽  
Plane Waves ◽  
The Other ◽  
Seismic Events ◽  
Seismic Model ◽  
Reflection And Transmission ◽  
Conversion Event ◽  
Reflection Theory

The measured amplitudes of two seismic events which have traveled through a two layer seismic model are compared with the amplitudes calculated from plane wave reflection and transmission theory. The relative amplitudes of the events, one a dilatational‐dilatational and the other a dilatational‐to‐shear conversion event, are found to be in agreement with calculations based on reflection theory for plane waves, after correction for [Formula: see text] divergence.

Study of wave attenuation in concrete

1993 ◽  
Vol 8 (9) ◽  
pp. 2344-2353 ◽  
Author(s):  
J-M. Berthelot ◽  
Souda M. Ben ◽  
J.L. Robert
Keyword(s):  
Experimental Study ◽  
Plane Wave ◽  
Wave Attenuation ◽  
Plane Waves ◽  
Propagation Distance ◽  
Experimental Results ◽  
The Other ◽  
Wave Frequency ◽  
Concrete Composition ◽  
Analytical Expression

The experimental study of wave attenuation in concrete has been achieved in the case of the propagation of plane waves in concrete rods. Different mortars and concretes have been investigated. A transmitter transducer coupled to one of the ends of the concrete rod generates the propagation of a plane wave in the rod. The receiver transducer, similar to the previous one, is coupled to the other end of the rod. The experimental results lead to an analytical expression for wave attenuation as function of the concrete composition, the propagation distance, and the wave frequency.

scholarly journals Notes on reflection and refraction of evanescent plane waves on the boundary between gainy/lossy media

2020 ◽  
Vol 71 (4) ◽  
pp. 227-236
Author(s):  
Jozefa Červeňová ◽  
Rastislav Dosoudil ◽  
Jaroslav Franek ◽  
L’ubomír Šumichrast
Keyword(s):  
Plane Wave ◽  
Plane Waves ◽  
Planar Boundary ◽  
Reflection And Transmission ◽  
Reflection And Refraction ◽  
Dielectric Media ◽  
Homogeneous Plane ◽  
Lossy Media

AbstractReflection and transmission (refraction) of a homogeneous plane wave at the planar boundary of two dielectric media is a well known phenomenon commonly treated in nearly all standard textbooks. Here the analysis of reflection and refraction of evanescent plane waves on the planar boundary between various combinations of lossy, gainy and lossless media is performed. It is shown that by the appropriate choice of the profile of evanescence various effects can take place.

scholarly journals APPLYING PIV MEASUREMENTS ON FLOW FIELD OF WAVES PROPAGATING OVER A SINGLE SUBMERGED POROUS ELASTIC BREAKWATER

2012 ◽  
Vol 1 (33) ◽  
pp. 29
Author(s):  
Tai-Wen Hsu ◽  
Yuan-Jyh Lan ◽  
Jian-Wu Lai ◽  
Yung-Han Cheng ◽  
Shan-Hwei Ou
Keyword(s):  
Flow Field ◽  
Wave Reflection ◽  
Surface Friction ◽  
The Other ◽  
Pressure Gradients ◽  
Wave Reflections ◽  
Reflection And Transmission ◽  
Submerged Breakwater ◽  
Piv Measurements ◽  
Image Velocimetry

The objective of the present study is to investigate the flow field for waves propagating over a submerged poro-elastic breakwater. Particle Image Velocimetry (PIV) measurements were performed in wave conditions with breakwaters made of different materials. The experimental results were compared for various rigid and impermeable, elastic and impermeable, as well as poro-elastic cases. Measurements of wave reflection and transmission induced by soft and permeable submerged breakwaters are both carried out. The results show that the oscillatory motion of elastic submerged breakwater can induce extra reflective waves and result in a larger reflection coefficient. Positive (counterclockwise) and negative (clockwise) vortices are generated due to corner separation and pressure gradients. The negative vortex obtained in a poro-elastic breakwater is generated by the surface friction at the top of the structure. Because of the permeability, it is found that the negative vortex at the upstream side of the elastic and permeable case is smaller than that of the rigid and impermeable one. In contrast, the positive vortex at the downstream side of the poro-elastic case is larger than that seen with the other two cases. It is concluded that a poro-elastic breakwater would induce different wave reflections and flow patterns from those seen with the other cases due to its particular wave and structure interactions.

Use of reflection phases on microearthquake seismograms to map an unusual discontinuity beneath the Rio Grande rift

1973 ◽  
Vol 63 (6-1) ◽  
pp. 2021-2034 ◽  
Author(s):  
Allan R. Sanford ◽  
Ömer Alptekin ◽  
Tousson R. Toppozada
Keyword(s):  
New Mexico ◽  
Plane Wave ◽  
Wave Energy ◽  
Wave Reflection ◽  
Rio Grande ◽  
Rio Grande Rift ◽  
S Wave ◽  
Large Velocity ◽  
Reflection Theory ◽  
Fault Mechanism

Abstract Microearthquake seismograms recorded by stations located in or bordering the Rio Grande rift near Socorro, New Mexico, frequently have two sharp impulsive phases following direct S. These phases have been identified as SxP and SxS reflections from a sharp discontinuity that has a depth beneath Socorro of 18 km and dips northward at an angle near 6° for a distance of 30 km. Farther north, the dip steepens so that at a distance of 60 km from Socorro the depth is about 30 km. Ratios of SxP to SxS amplitudes in conjunction with plane-wave reflection theory indicate a zone of very low rigidity beneath the discontinuity. Large SxS amplitudes are believed to be the result of the large velocity contrast across the discontinuity and a fault mechanism that radiates more S-wave energy downward than outward from the focus.

Plane‐wave reflection and transmission coefficients for a transversely isotropic solid

Geophysics ◽  
1992 ◽  
Vol 57 (11) ◽  
pp. 1512-1519 ◽  
Author(s):  
Mark Graebner
Keyword(s):  
Plane Wave ◽  
Wave Reflection ◽  
Transversely Isotropic ◽  
Reflection And Transmission Coefficients ◽  
Reflection And Transmission ◽  
Transmission Coefficients ◽  
Isotropic Solid

Numerous investigators have studied the P-SV reflection and transmission coefficients of an isotropic solid (Zoeppritz, 1919; Nafe, 1957; Frasier, 1970; Young and Braile, 1976; Kind, 1976; Aki and Richards, 1980).

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