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Head waves from a transition layer

APPLIED SCIENCE LABORATORY GENERAL DYNAMICS, FORT WORTH DIVISION, FORT WORTH, TEXAS 76101

Abstract

Ultrasonic, seismic-model experiments have been performed to re-examine the nature of head waves from a transition layer. Two-dimensional, layered structures, some with a transition zone and some with a sharp discontinuity, constructed by lead-aluminum laminations have served as the models. Amplitude and phase responses have been measured in a frequency range of 25 kHz to 200 kHz. At low frequencies, where the wavelength is much longer than the thickness of the transition zone, little difference is observed between head waves from a transition zone and those from a sharp discontinuity. At a certain frequency range where the wavelength is close to the thickness of the transition zone, the measured head-wave amplitude from a transition zone becomes a few times larger than that from a sharp discontinuity. This is characteristic of head waves from a poorly defined boundary and may be used to estimate the thickness of a general transition layer. A sharp, high-frequency cutoff is again observed, but the cutoff frequency is not consistent with previous studies.

This article has been cited by other articles:

				T. HIRASAWA and M. J. BERRY Reflected and head waves from a linear transition layer in a fluid medium Bulletin of the Seismological Society of America, February 1, 1971; 61(1): 1 - 25. [Abstract] [PDF]