Identification of Subsonic P-Waves
نویسنده
چکیده
A field trial was conducted to test the existence of subsonic (Vp < 331 m/s) P-waves previously reported in the literature. A 1-m-long reverse profile was acquired with three-component (3C) geophones on a sandy silt (unified classification ML). The silt had a porosity of 54%, a degree of water saturation of 63%, and a plasticity index of 10. No subsonic P-waves were observed, although highfrequency (up to 1200 Hz) Rayleigh waves were identified by hodogram analysis. These surface waves were observed with horizontal velocities that varied from 40 to 200 m/s. Hodogram observations and theory suggest that a portion of the data were also in the near-field.
منابع مشابه
Theory of Creeping Waves in Acoustics and Their Experimental Demonstration
The theory of creeping waves is developed by applying the Sommerfeld-Watson transformation on the normal-mode solution for acoustic scattering from an infinite elastic cylinder. Two types of radiating, circumferential waves emerge: (1) highly attenuated “Franz-type” waves with subsonic speeds, and (2) supersonic “Rayleigh-type” waves which are only slightly attenuated. The experimental study of...
متن کاملAsymptotic Axisymmetry of the Subsonic Traveling Waves to the Gross-pitaevskii Equation
In this note we show the asymptotic axisymmetry of subsonic traveling waves of finite energy to the Gross-Pitaevskii equation. In particular, using a new Hamiltonian identity, we prove that the momentum in the orthogonal directions must vanish.
متن کاملNonlinear compressional electromagnetic ion-cyclotron wavepackets in space plasmas
The parametric coupling between large amplitude magnetic field-aligned circularly polarized electromagnetic ion-cyclotron (EMIC) waves and ponderomotively driven ion-acoustic perturbations in magnetized space plasmas is considered. A cubic nonlinear Schrödinger equation for the modulated EMIC wave envelope is derived, and then solved analytically. The modulated EMIC waves are found to be stable...
متن کاملMultidimensional Stability of Subsonic Phase Transitions in a Non-Isothermal Van Der Waals Fluid
We show the multidimensional stability of subsonic phase transitions in a non-isothermal van der Waals fluid. Based on the existence result of planar waves in our previous work [1], a jump condition is posed on non-isothermal phase boundaries which makes the argument possible. Stability of planar waves both in one dimensional and multidimensional spaces are proved.
متن کاملTransonic Evaporation Waves in a Spherically Symmetric Nozzle
This paper studies the liquid to vapor phase transition in a cone shaped nozzle. Using the geometric method presented in [32, 34], we further develop results on subsonic and supersonic evaporation waves in [14] to transonic waves. It is known that transonic waves do not exist if restricted solely to the slow system on the slow manifolds [14]. Thus we consider the existence of transonic waves th...
متن کامل