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FDM Simulation of an Anomalous Later Phase from the Japan Trench Subduction Zone Earthquakes
We investigated the development of a distinct later phase observed at stations near the Japan Trench associated with shallow, outer-rise earthquakes...
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Complex effective relative permittivity of soil samples from the taunus region (Germany)
The most important parameter affecting ground-penetrating radar (GPR) measurements is the complex effective relative permittivity ɛ
r,eff ... -
Study on the effect of the oceanic water layer on strong ground motion simulations
We studied the effect of the oceanic water layer on strong ground motion simulations. Source faults of subduction zone earthquakes, such as the...
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Inversion of Scholte wave dispersion and waveform modeling for shallow structure of the Ninetyeast Ridge
The construction of S-wave velocity models of marine sediments down to hundreds of meters below the seafloor is important in a number of disciplines....
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2-D Frequency-domain Waveform Inversion of Coupled Acoustic-Elastic Media with an Irregular Interface
In order to correctly interpret marine exploration data, which contain many elastic signals such as S waves, surface waves and converted waves, we...
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2.5D Boundary element simulation of wave propagation in a vertical fluid-filled borehole with irregular shape
In this paper, a boundary element formulation in the wave-number space domain for solving the wave equation for a borehole with arbitrary shape in...
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Elastic Theories
Elasticity theory incorporates shear forces not included in fluid theory. Elastic media support two types of waves: compressional waves analogous to...
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Geoacoustic Properties
The geoacoustic properties to be discussed in this chapter include speed and attenuation of both compressional and shear waves, acoustic impedance...
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Acquisition and Inversion of Dispersive Seismic Waves in Shallow Marine Environments
Two types of dispersive seismic waves have been acquired in different geological settings to investigate the potential to reveal the elastic...
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Sub-Bottom Variability Characterization Using Surface Acoustic Waves
The study of both acoustic propagation and reverberation require a “realistic” information on bottom and sub-bottom properties, especially in shallow...
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T-phase Observations in Northern California: Acoustic to Seismic Coupling at a Weakly Elastic Boundary
— Plans for a hydroacoustic network intended to monitor compliance with the CTBT call for the inclusion of five T -phase stations situated at optimal...
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T-phase Observations in Northern California: Acoustic to Seismic Coupling at a Weakly Elastic Boundary
Plans for a hydroacoustic network intended to monitor compliance with the CTBT call for the inclusion of five T-phase stations situated at optimal...
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Geophysical Sensing and Hydrate
The geographic extent of hydrate deposits and their distribution within the sediment column are still relatively undefined. Both single and...
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An implosive seismoacoustic source for seismic experiments on the ocean floor
Bottom shots have been used for a number of years in seismic studies on the ocean floor. Most experiments utilized explosives as the energy source,...
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Scattering ofP andS waves by a spherically symmetric inclusion
Scattering of an arbitrary elastic wave incident upon a spherically symmetric inclusion is considered and solutions are developed in terms of the...
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Fidelity of ocean bottom seismic observations
The often poor quality of ocean bottom seismic data, particularly that observed on horizontal seismometers, is shown to be the result of instruments...
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Implications of Deep-Water Seismometer Array Measurements for Scholte Wave Propagation
A field exercise was conducted in March 1990 to make measurements of Scholte wave propagation characteristics in a deep ocean environment. Signals...
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A Stable Higher-Order Elastic Parabolic Equation with Application to Scholte Wave Propagation
An accurate and stable elastic parabolic equation (PE) is derived from a higher-order Padé approximation. Accuracy is achieved by constraining some...