Basit öğe kaydını göster

dc.contributor.authorOzalaybey, S
dc.contributor.authorYalcin, MN
dc.contributor.authorAktar, M
dc.contributor.authorErgin, M
dc.date.accessioned2021-03-02T22:58:47Z
dc.date.available2021-03-02T22:58:47Z
dc.identifier.citationErgin M., Ozalaybey S., Aktar M., Yalcin M., "Site amplification at Avcilar, Istanbul", TECTONOPHYSICS, cilt.391, ss.335-346, 2004
dc.identifier.issn0040-1951
dc.identifier.othervv_1032021
dc.identifier.otherav_0fc28397-2f4e-4fab-900e-12d7c3ccf904
dc.identifier.urihttp://hdl.handle.net/20.500.12627/16127
dc.identifier.urihttps://doi.org/10.1016/j.tecto.2004.07.021
dc.description.abstractAvcilar is the suburb of Istanbul that was most heavily damaged during the August 17, 1999 M-w 7.4 Izmit earthquake. Strong ground motion caused fatalities and damage in Avcilar despite being similar to90 km from the epicenter. We deployed five portable seismograph stations equipped with Reftek 24-bit recorders and L4C-3D seismometers for 2 months, in order to understand why the local site response was different from elsewhere in Istanbul. A reference station was placed on a hard rock site, and the remaining four stations were placed on other geological units, in areas that had experienced varying levels of damage. We calculated frequency-dependent ground amplification curves by taking the ratios of the spectra at soft and hard rock sites. We obtained similar site response curves for most earthquakes at each site in the frequency range of 0.3-1.6 Hz, and observed no significant site amplification beyond 2.0 Hz at any site. The overall characteristics of the recorded S-waveforms and our modeling of the calculated site amplification curves are consistent with amplification as a result of trapping of seismic energy within a 100-150 m thick, low-velocity subsurface layer. We also review the applicability of microtremor measurements to estimate local site effects at Avcilar. For these data, we used ratios of spectra of horizontal to vertical components to obtain each site response. These results are compared with standard spectral ratios. These microtremor measurements provide consistent estimates of the amplification at most sites at the higher end of the frequency band, namely above 1 Hz. The results from both methods indeed agree well in this part of the frequency band. However, the microtremor method fails to detect amplification at lower frequencies, namely <1.0 Hz. (C) 2004 Elsevier B.V. All rights reserved.
dc.language.isoeng
dc.subjectYerbilimleri
dc.subjectMühendislik ve Teknoloji
dc.subjectJEOKİMYA VE JEOFİZİK
dc.subjectJeofizik Mühendisliği
dc.subjectTemel Bilimler (SCI)
dc.titleSite amplification at Avcilar, Istanbul
dc.typeMakale
dc.relation.journalTECTONOPHYSICS
dc.contributor.department, ,
dc.identifier.volume391
dc.identifier.startpage335
dc.identifier.endpage346
dc.contributor.firstauthorID172825


Bu öğenin dosyaları:

DosyalarBoyutBiçimGöster

Bu öğe ile ilişkili dosya yok.

Bu öğe aşağıdaki koleksiyon(lar)da görünmektedir.

Basit öğe kaydını göster