4 edition of The attenuation of crustal seismic waves in New England found in the catalog.
The attenuation of crustal seismic waves in New England
Written in English
|Other titles||Crustal seismic waves in New England|
|Statement||Robert D. Cicerone.|
|The Physical Object|
|Number of Pages||97|
Regional Wave Propagation in New England and New York by Gisela M. Viegas, Laurie G. Baise, and Rachel E. Abercrombie Abstract We validate and improve 1D velocity models of the two main crustal provinces in the northeastern United States (NEUS), using seismograms from the20 April M 5 Au Sable Forks earthquake, which is the largest earthquake in. The evaluation of seismic attenuation represents a main goal for the quantitative estimate of the parameters which control the propagation of elastic waves and the source processes. The shallower crustal material may undergo significant spatial and temporal changes in physical properties affecting the attenuation by: 3.
In this study, the frequency dependent quality factor of Lg waves in the New Madrid seismic zone (NMSZ) is estimated using the coda normalization method and properties that coda waves offer. In an average sense, attenuation of Lg waves can be an indicator of lateral crustal properties. At regional distances, this phase has the highest amplitude Cited by: 5. The seismic quality factor (Q c) and the attenuation coefficient (δ) in the earth’s crust in southwest (SW) Anatolia are estimated by using the coda wave method based on the decrease of coda wave amplitude by time on the seismogram. The quality factor Q o, the value of Q c at 1 Hz, and its frequency dependency η are determined from this method depending on the attenuation properties of Cited by: 7.
Attenuation of P and S waves has been investigated in Alborz and north central part of Iran using the data recorded by two permanent and one temporary networks during Octo , to Decem The dataset consists of 14, waveforms from local earthquakes (2 waves Cited by: 3. [ 1] Fourier spectra of crustal guided Lg waves are collected to study seismic attenuation, or Q, along the INDEPTH profiles. The 1 Hz Lg Q (Q(0)) values are measured between many pairs of two stations and input to a back projection algorithm to obtain laterally varying Q(0) models.
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The attenuation of upper crustal seismic waves that are refracted with a velocity of about 6 kilometers per second varies greatly among profiles in the area of the New Madrid seismic zone in the central Mississippi Valley.
The waves that have the strongest attenuation pass through the seismic. Seismic attenuation exhibits strong geographic variability in northeastern North America, with the highest values associated with the previously recognized Northern Appalachian Anomaly (NAA) in southern New England.
The shear wave quality factor at km depth is 14 wave and S wave quality factors is Q P /Q S = Cited by: 5. The energy-flux model of seismic coda, developed by Frankel and Wennerberg (), is used to derive path-averaged estimates of The attenuation of crustal seismic waves in New England book and intrinsic attenuation for northeastern North America.
Seismic wave attenuation was measured in New England from the time domain decay of coda wave amplitudes on narrow bandpass-filtered seismograms of local earthquakes. The frequency band of Author: Jay Pulli. 3 Seismic wave attenuation in the Vrancea region. Part II. Crustal Q-models Article no.
The density models are based on the work of . We note that the selection of the data for this first application of the proposed procedure to investigate the crustal attenuation in the area of interest tookFile Size: 1MB. Abstract. The mechanisms contributing to the attenuation of earthquake ground motion in the distance range of 10 to km are studied with the aid of laboratory data, coda waves, Rg attenuation, strong motion attenuation measurements in the northeast United States and Canada, and theoretical models.
The frequency range 1 10 Hz has been by: The seismic attenuation of direct S and coda waves in NE India are strongly frequency dependent.
Estimated Q C values at 1 Hz (Q 0) increase from to and their frequency dependencies n decrease from to with increase in lapse time window from 40 to 60 by: analysis. The attenuation of wave is defined by the inverse of quality factor (−1) while quality factor () is the wave transmission quality of the medium.
Knopoff13 defined the attenuation of wave in terms of energy as 1 2 Q E SE ' where Δ is the loss of energy per cycle and is the total energy of the wave. The attenuation of seismic wavesFile Size: KB. Our attenuation measurements indicated low Lg attenuation in the Adirondack Mountains with exposed Precambrian Grenville basement with Q Lg = fhigh Lg attenuation in the central Appalachian Province with Q Lg = – f –, and an intermediate Lg attenuation in northern New England Appalachians with Q = f Cited by: Attenuation of seismic waves.
Seismic waves decay as they radiate away from their sources, partly for geometric reasons because their energy is distributed on an expanding wave front, and partly because their energy is absorbed by the material they travel through. The energy absorbtion depends on the material properties.
Crustal seismic wave attenuation is closely connected with the tectonics and the strength of the crust [7, 8]. The knowledge of regional values of the seismic wave attenuation (inverse of quality. Attenuation of seismic waves in dry and saturated rocks: II.
Mechanisms 0. Johnston*, M. Tokst)z*, and A. Timur$ Theoretical models based on several hypothesized attenuation mechanisms are discussed in relation to pub- lished data on the effects of pressure and fluid saturation on attenuation.
These mechanisms include friction,File Size: 1MB. to wavespeed models, existing global models of attenuation ex-hibit limited agreement, e.g., Romanowicz (), Gung and Ro-manowicz (), Dalton et al. In contrast to body-wave traveltimes or surface-wave dispersion, which are solely governed by seismic wavespeeds, seismic wave amplitudes are affected byFile Size: 6MB.
Seismic High Attenuation Region Observed Beneath Southern New England From Teleseismic Body Wave Spectra: Evidence for High Asthenospheric Temperature Without Melt.
Seismic Wave Attenuation (Geophysics Reprint Series No 2) by M. Toksoz (Author), D. Johnston (Author) ISBN Format: Paperback. Seismic wave attenuation was measured in New England from the time domain decay of coda wave amplitudes on narrow bandpass-filtered seismograms of local earthquakes.
The frequency band of. The energy-flux model of seismic coda, developed by Frankel and Wennerberg (), is used to derive path-averaged estimates of scattering ( ) and intrinsic attenuation ( ) for northeastern North model predicts the amplitude of the coda wave versus time as a function of frequency, , and .A nonlinear inversion scheme is developed that allows for the estimation of Cited by: 2.
Brian J. Mitchell, Nazieh K. Yacoub and Antoni M. Correig, A Summary of Seismic Surface Wave Attenuation and Its Regional Variation Across Continents and Oceans, The Earth's Crust, (), ().
Wiley Online Library. The seismic wave attenuation was studied using coda waves. The single scattering method proposed by Sato in was applied, the attenuation and frequency dependency for different paths and the correlation of the results with the geotectonics of the region are presented in this by: SEISMIC VISCOELASTIC ATTENUATION Synonyms Seismic intrinsic attenuation Definitions Linear viscoelastic attenuation.
The loss of energy to heat within a material as an elastic wave propagates through the material, in which the resultant elastic deformation (strain) in the material lags in time the applied stress induced by the wave.
Apparent. In this chapter a brief introduction on seismic wave attenuation is given. A discussion on coda waves and their properties is also included in this chapter.
The back scattering model (Aki and Chouet, ) is also discussed, which is a way to model coda wave excitation. Seismic waves Seismic waves are waves of energy that travel through the.In this study, spatial variation of coda wave attenuation in the north western (NW) Iranian Plateau is explored using local earthquakes.
Single backscattering method is used to map the spatial variations of coda Q (Q c) us earthquakes which are recorded digitally by sixteen permanent ed spatial attenuation maps are well correlated with geological setting of study by: 4.Earthquake accelerograms and attenuation of seismic waves at Oolong, New South Wales Ron S.
Smith & A. J. McEwin The first Australian earthquake accelerograms were obtained from an accelerograph situated in the Dalton-Gunning region of New File Size: 8MB.