Surface and borehole accelerograms versus spectral-element simulation of alluvial basin in Cefalonia

Psarropoulos, PN; Gazetas, G

dc.contributor.author	Psarropoulos, PN	en
dc.contributor.author	Gazetas, G	en
dc.date.accessioned	2014-03-01T02:48:46Z
dc.date.available	2014-03-01T02:48:46Z
dc.date.issued	1999	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/34098
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0033507728&partnerID=40&md5=bde3991808f6af4f67d112f3eb177e56	en
dc.subject.other	accelerometer	en
dc.subject.other	amplification	en
dc.subject.other	conference proceedings	en
dc.subject.other	geometry	en
dc.subject.other	sedimentary basin	en
dc.subject.other	seismic response	en
dc.subject.other	site effect	en
dc.subject.other	Greece	en
dc.title	Surface and borehole accelerograms versus spectral-element simulation of alluvial basin in Cefalonia	en
heal.type	conferenceItem	en
heal.publicationDate	1999	en
heal.abstract	The seismic response of a long and narrow alluvial basin (valley) in the island of Cefalonia has been monitored with four digital accelerometers - two on the surface near the center of the valley, one at a depth of 38 m below the surface in a stiff layer of marl, and one on outcroping limestone at one of the edges of the valley. A nearby earthquake event of M(S) 4.2 has produced valuable records, with peak accelerations of 0.055 g and 0.040 g at the surface, 0.017 g at -38 m and 0.020 g at rock outcrop. One-dimensional (1-D) analyses could not explain the nature and amplitude of these recorded motions. This paper presents the results of a two-dimensional (2-D) wave-propagation analysis using the spectral-element code AHNSE and modeling the seismic excitation as vertically incident S waves compatible with the (base) motion recorded at -38 m. The agreement of the numerically reproduced ground surface motions with the corresponding records is satisfactory. The results of the study reveal the profound significance of the triangular shape of the valley to amplify the seismic waves in the presence of small levels of damping.	en
heal.publisher	A.A.Balkema	en
heal.journalName	Earthquake geotechnical engineering. Proceedings of the 2nd international conference on earthquake geotechnical engineering, Lisbon, June 1999. (3 vols.).	en
dc.identifier.spage	157	en
dc.identifier.epage	162	en