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Lg Coda Variations in North-Central Iran
University of Tehran.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
International Institute of Earthquake Engineering and Seismology (IIEES), Tehran.
2012 (English)In: International Journal of Geophysics, ISSN 1687-885X, E-ISSN 1687-8868, Vol. 2012, 673506- p.Article in journal (Refereed) Published
Abstract [en]

Ground motion records in north-central Iran have been used in order to obtain the Lg coda Q, using stack spectral ratiomethod. The lateral variations in Q0 and its frequency dependence are estimated in the 0.3–7.0Hz frequency range which ledto Q = 267(±32) × f 0.71(±0.14). The observed variations in quality factor show low values of Q0 in western part of the study regionwhere bounded by relatively high values in southern and northern parts. Since the seismicity of the study area is quite shallowthe obtained results can be attributed to the upper 30 km of the crust. The Damavand volcano and its surrounding region alsoexhibit variations in the value of Q0 which result in low and intermediate values of Q0 in western and eastern parts, respectively.Current seismicity in Damavand is mostly confined to its southwestern part, whereas our results proved to possess low values of Q0. In general, most of Q factor variations can be attributed to the lateral heterogeneity as well as the severity of the crustal velocitygradient, and as expected the north-central Iran is well inferred as a tectonically active region.

Place, publisher, year, edition, pages
2012. Vol. 2012, 673506- p.
National Category
Geophysics
Research subject
Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
Identifiers
URN: urn:nbn:se:uu:diva-169546DOI: 10.1155/2012/673506OAI: oai:DiVA.org:uu-169546DiVA: diva2:507228
Available from: 2012-03-02 Created: 2012-03-02 Last updated: 2017-12-07

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