Show simple item record

dc.contributor.authorKalafat, D.
dc.contributor.authorSezgin, N.
dc.contributor.authorBaris, S.
dc.contributor.authorMatsushima, M.
dc.contributor.authorHoriuchi, S.
dc.contributor.authorPinar, A.
dc.contributor.authorUcer, S. B.
dc.contributor.authorHonkura, Y.
dc.contributor.authorIto, A.
dc.date.accessioned2021-03-05T08:51:06Z
dc.date.available2021-03-05T08:51:06Z
dc.date.issued2010
dc.identifier.citationPinar A., Ucer S. B. , Honkura Y., Sezgin N., Ito A., Baris S., Kalafat D., Matsushima M., Horiuchi S., "Spatial variation of the stress field along the fault rupture zone of the 1999 Izmit earthquake", EARTH PLANETS AND SPACE, cilt.62, ss.237-256, 2010
dc.identifier.issn1343-8832
dc.identifier.otherav_9afe07b9-01f4-442e-b348-62ae39061efe
dc.identifier.othervv_1032021
dc.identifier.urihttp://hdl.handle.net/20.500.12627/104185
dc.identifier.urihttps://doi.org/10.5047/eps.2009.12.001
dc.description.abstractWe have investigated the spatial variation of the stress field along the fault rupture zone of the 1999 Izmit earthquake (M(W) 7.4) using first-motion polarity data at seven distinct aftershock clusters. In our approach, the first-motion polarities of all the aftershocks in a cluster are simultaneously inverted to determine the stress tensor parameters and fault plane solutions of individual events, in accordance with the method of Horiuchi et al. (1995). Where post-seismic slip was significant (e.g., Sapanca, Sakarya-Akyazi, and Karadere segments), we obtained stress tensors with the fault parallel or fault normal maximum (sigma(1)) and minimum (sigma(3)) principal compressive stress axes, which may imply either low frictional coefficients or fault weakness. A stress tensor with similar features was derived from the Cinarcik cluster, where the aftershocks lie in a low-velocity zone beneath the geothermal area. The maximum principal stress axis tends to remain parallel to the trend of the pre-mainshock sigma(1) around the Yalova segment; this segment experienced little to no co-seismic displacements. The stress tensor around the Golcuk segment, where the largest surface displacement of 5.5 m was observed, was determined to be 20-25 degrees counterclockwise rotated, but the aftershock alignment remained fault parallel. We interpret these results in terms of the strong crust. On the other hand, both the aftershock alignment and the stress tensor were found to be rotated in the Izmit earthquake epicentral region despite the lower co-seismic displacements. We attribute this feature to the weak crust.
dc.language.isoeng
dc.subjectTemel Bilimler (SCI)
dc.subjectJeoloji Mühendisliği
dc.subjectYER BİLİMİ, MULTİDİSİPLİNER
dc.subjectYerbilimleri
dc.subjectJEOLOJİ
dc.subjectMühendislik ve Teknoloji
dc.titleSpatial variation of the stress field along the fault rupture zone of the 1999 Izmit earthquake
dc.typeMakale
dc.relation.journalEARTH PLANETS AND SPACE
dc.contributor.departmentİstanbul Üniversitesi , ,
dc.identifier.volume62
dc.identifier.issue3
dc.identifier.startpage237
dc.identifier.endpage256
dc.contributor.firstauthorID194832


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record