Results 241 to 250 of about 5,824,919 (291)

Multiple reflections of seismic energy

Geophysics, 1948
Abstract This paper is a report of observations of multiple reflections in seismograph work in Argentina, of successful methods of identifying them, and of unsuccessful attempts to eliminate them. The paper begins with generalizations regarding the expectancy of multiples and develops geometrically (using straight-line paths) the ...
Raul F. Hansen, Curtis H. Johnson
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Seismic energy source

The Journal of the Acoustical Society of America, 1988
A hydraulically controlled seismic energy source for impressing individual seismic energy pulses into the ground, wherein the hydraulic pressure forcing the ram downwardly is substantially reduced slightly before the ram contacts the ground, and a continual upward hydraulic force is applied to a downwardly facing surface of the ram, whereby the ram is ...
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Seismic energy release of the Moon

Journal of Geophysical Research: Solid Earth, 1981
Previous estimates of the seismic energy released by lunar events have not properly accounted for instrument bandwidth, variations in corner frequency, and the effects of intense scattering. In this paper, equations are developed that include all of these effects and give realistic estimates for source parameters.
Neal R. Goins, Anton M. Dainty, M. Nafi Toksöz   +2 more
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How seismic waves lose energy

Science, 2017
Energy loss varies with frequency in the lithosphere but not in the ...
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Broadband seismic energy source

The Journal of the Acoustical Society of America, 1981
A vibratory seismic energy source capable of generating significant energy over a broad frequency band. The vibrating baseplate and associated structure are designed to have minimum weight while still retaining sufficient structural integrity to permit the use of high actuator forces.
Richard M. Weber, John W. Bedenbender
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Comparison of seismic energy sources

Proceedings, 1996
Knowledge about the power and other characteristic parameters of a seismic source is of general interest. Especially for shallow reflection seismic surveys many alternate sources are published and already in use. Common shallow reflection seismic energy sources are e.g. the sledge hammer, the Buffalo Gun and small amounts of explosives.
R. K. Fruhwirth, R. Schmöller
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Evaluation of seismic energy demand

Earthquake Engineering & Structural Dynamics, 2001
AbstractIn this paper, a method is proposed in order to obtain a simplified representation of hysteretic and input energy spectra. The method is based on the evaluation of the equivalent number of cycles correlated to the earthquake characteristics by the proposed seismic index ID.
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Energy Partitioning of Seismic Waves

2011
When an incoming P wave strikes an interface between two isotropic homogeneous elastic media at some angle other than the vertical, some of the energy is converted into S wave which gets reflected and transmitted in the same way as the P wave. This is known as the energy partitioning of seismic wave.
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An energy-based methodology for the assessment of seismic demand

Soil Dynamics and Earthquake Engineering, 2001
Abstract A methodology for the assessment of the seismic energy demands imposed on structures is proposed. The research was carried out through two consecutive phases. Inelastic design input energy spectra for systems with a prescribed displacement ductility ratio were first developed.
DECANINI, Luis Domingo, MOLLAIOLI, Fabrizio   +1 more
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Seismic strain energy partitioning: estimating the strain energy of seismic body waves.

2022
Christian Poppeliers, Brian Young
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