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ESTIMATION OF SEISMIC WAVE COHERENCY...

ABRAHAMSON, NORMAN ALAN.

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ESTIMATION OF SEISMIC WAVE COHERENCY AND RUPTURE VELOCITY USING THE SMART 1 STRONG MOTION ARRAY RECORDINGS (TAIWAN, MULTISUPPORT, EARTHQUAKE).

Record Type:	Electronic resources : Monograph/item
Title/Author:	ESTIMATION OF SEISMIC WAVE COHERENCY AND RUPTURE VELOCITY USING THE SMART 1 STRONG MOTION ARRAY RECORDINGS (TAIWAN, MULTISUPPORT, EARTHQUAKE)./
Author:	ABRAHAMSON, NORMAN ALAN.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 1985,
Description:	135 p.
Notes:	Source: Dissertation Abstracts International, Volume: 46-09, Section: B, page: 2987.
Contained By:	Dissertation Abstracts International46-09B.
Subject:	Geophysics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8524872

ESTIMATION OF SEISMIC WAVE COHERENCY AND RUPTURE VELOCITY USING THE SMART 1 STRONG MOTION ARRAY RECORDINGS (TAIWAN, MULTISUPPORT, EARTHQUAKE).
ABRAHAMSON, NORMAN ALAN.

ESTIMATION OF SEISMIC WAVE COHERENCY AND RUPTURE VELOCITY USING THE SMART 1 STRONG MOTION ARRAY RECORDINGS (TAIWAN, MULTISUPPORT, EARTHQUAKE). - Ann Arbor : ProQuest Dissertations & Theses, 1985 - 135 p.

Source: Dissertation Abstracts International, Volume: 46-09, Section: B, page: 2987.

Thesis (Ph.D.)--University of California, Berkeley, 1985.

The January 29, 1981 Taiwan earthquake (M(,L) = 6.7) was recorded digitally by 27 triaxial force-balanced accelerometers in the SMART 1 strong motion array centered 30 km north-northwest of the epicenter. The seismic source of this event had a reverse mechanism with unilateral rupture from east to west.Subjects--Topical Terms:

535228
Geophysics.

ESTIMATION OF SEISMIC WAVE COHERENCY AND RUPTURE VELOCITY USING THE SMART 1 STRONG MOTION ARRAY RECORDINGS (TAIWAN, MULTISUPPORT, EARTHQUAKE).
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100 1 $a ABRAHAMSON, NORMAN ALAN. $3 3341414
245 1 0 $a ESTIMATION OF SEISMIC WAVE COHERENCY AND RUPTURE VELOCITY USING THE SMART 1 STRONG MOTION ARRAY RECORDINGS (TAIWAN, MULTISUPPORT, EARTHQUAKE).
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1985
300 $a 135 p.
500 $a Source: Dissertation Abstracts International, Volume: 46-09, Section: B, page: 2987.
502 $a Thesis (Ph.D.)--University of California, Berkeley, 1985.
520 $a The January 29, 1981 Taiwan earthquake (M(,L) = 6.7) was recorded digitally by 27 triaxial force-balanced accelerometers in the SMART 1 strong motion array centered 30 km north-northwest of the epicenter. The seismic source of this event had a reverse mechanism with unilateral rupture from east to west.
520 $a These array recordings are used to make direct measurements of the wave coherency and the time dependent rupture velocity. Frequency-wavenumber analysis shows that across the 4 km array, the P waves contain coherent energy from the source region at frequencies up to 6 Hz while the S waves contain coherent energy up to 3 Hz. Significant energy is present in the P and S waves at frequencies above these two levels, but it is incoherent or scattered energy. Some refinements of the traditional wavenumber spectra analysis for array measurements are developed.
520 $a The time dependent rupture velocity is estimated by measuring the time dependent phasing of the coherent P and S waves across the array. Temporal changes in the azimuth of the wavefronts provide a direct measurement of the moving source. The preferred rupture velocity varies from a minimum of 2.1 km/sec to a maximum of 4.9 km/sec over a fault length of 19 km with a mean of about 3.1 km/sec. This estimate is believed to be the first obtained with a 2-dimensional strong motion array.
520 $a Engineering implications of coherent non-vertically propagating waves are explored by measuring the dynamic response ratio which indicates the relative amplitude of the dynamic response of the structure compared with the traditional reponse spectrum. Phase shifts in the ground motion across the array caused by non-vertically propagating waves produce up to a 25% reduction in the response spectrum at 5 Hz for rigid structures spanning a distance of 200 meters. The out-of-phase dynamic response ratio of a flexible structure with a period of 1 second and a support spacing of 200 meters is measured at 0.20-0.40 indicating that nonvertically propagating waves can produce a significant amount of out-of-phase energy for large engineered structures.
520 $a In order to analyze more fully the effect of multi-support input motions, the concept of a seismic response phase spectrum is defined to complement the usual Housner reponse (amplitude) spectrum. An efficient estimation algorithm is illustrated.
590 $a School code: 0028.
650 4 $a Geophysics. $3 535228
690 $a 0373
710 2 $a University of California, Berkeley. $3 687832
773 0 $t Dissertation Abstracts International $g 46-09B.
790 $a 0028
791 $a Ph.D.
792 $a 1985
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8524872