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Earthquake source spectra and attenu...

Atkinson, Gail Marie.

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Earthquake source spectra and attenuation in southeastern Canada.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Earthquake source spectra and attenuation in southeastern Canada./
Author:	Atkinson, Gail Marie.
Description:	234 p.
Notes:	Source: Dissertation Abstracts International, Volume: 54-08, Section: B, page: 4047.
Contained By:	Dissertation Abstracts International54-08B.
Subject:	Geophysics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NN81278
ISBN:	9780315812789

Earthquake source spectra and attenuation in southeastern Canada.
Atkinson, Gail Marie.

Earthquake source spectra and attenuation in southeastern Canada. - 234 p.

Source: Dissertation Abstracts International, Volume: 54-08, Section: B, page: 4047.

Thesis (Ph.D.)--The University of Western Ontario (Canada), 1993.

A database for source spectral amplitude in eastern North America (ENA) is compiled for earthquakes of 3 $$ 4. The proposed source model has significant implications for ENA ground motion relations and seismic hazard assessment.

ISBN: 9780315812789Subjects--Topical Terms:

535228
Geophysics.

Earthquake source spectra and attenuation in southeastern Canada.
LDR:02735nam 2200277 a 45 001 965821
005 20110908
008 110908s1993 eng d
020 $a 9780315812789
035 $a (UnM)AAINN81278
035 $a AAINN81278
040 $a UnM $c UnM
100 1 $a Atkinson, Gail Marie. $3 1288572
245 1 0 $a Earthquake source spectra and attenuation in southeastern Canada.
300 $a 234 p.
500 $a Source: Dissertation Abstracts International, Volume: 54-08, Section: B, page: 4047.
502 $a Thesis (Ph.D.)--The University of Western Ontario (Canada), 1993.
520 $a A database for source spectral amplitude in eastern North America (ENA) is compiled for earthquakes of 3 $$ 4. The proposed source model has significant implications for ENA ground motion relations and seismic hazard assessment.
520 $a Definition of the spectrum of ground motion as a function of earthquake magnitude and distance is a crucial component of seismic hazard evaluations of engineered structures. This study uses an empirical approach to investigate the Fourier spectra of earthquake ground motions in southeastern Canada. The primary dataset is comprised of 1500 digital seismograms, from 100 earthquakes of magnitude 3.0 to 6.5 recorded on 30 stations of the Eastern Canada Telemetered Network (ECTN). The distance range of the observations is 10 to 1700 km; focal depths are from 5 to 30 km.
520 $a Regression analyses of the ECTN data are used to determine the source spectrum for each event and describe its attenuation with distance. Simulations demonstrate that observed ground motions can be accurately modeled using the regression results, in conjunction with a simple stochastic model.
520 $a The attenuation curve has three distance sections. At distances (R) less than 70 km, corresponding to attenuation of direct S-waves, Fourier spectral amplitudes decay as R$\sp{-1.1}$. Between 70 and 130 km, where the direct-wave is joined by S$\sb{\rm m} $s , spectral amplitudes are approximately constant. Beyond 130 km, corresponding to the Lg-phase, amplitudes decay at a rate that is consistent with R$\sp{-0.5}$ and Q = 670 f$\sp{0.33}$. The findings indicate that postcritical reflections from the Moho discontinuity play a significant role in determining the shape of the attenuation curve. However the influence of S$\sb{\rm m} $s is subtle, allowing the shape to be approximated by simple functional forms. There is little evidence for any dependence of attenuation on focal depth or tectonic province.
590 $a School code: 0784.
650 4 $a Geophysics. $3 535228
690 $a 0373
710 2 0 $a The University of Western Ontario (Canada). $3 1017622
773 0 $t Dissertation Abstracts International $g 54-08B.
790 $a 0784
791 $a Ph.D.
792 $a 1993
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NN81278