Preliminary Seismic Site Classification Map of Sarpol-e Zahab

Mojtaba Moosavi, Iman Ashayeri, Ebrahim Haghshenas, Mahnoosh Biglari, Mohsen Kamalian, Javad Jalili

Abstract


The destructive earthquake of Sarpol-e Zahab (Mw=7.3, Depth=18 Km) lead to sever damages to manyof structures of the affected region. The first reconnaissance of the area showed that the structures damage distribution could be interpreted by the effect of local site conditions. Therefore, some microtremor measurements and geophysical surveys were performed to investigate this concern. The survey included totally 41 locations of microtremor measurements and 40 locations of geophysical refraction profiles, the distribution of which covered all over the city. The recorded motions were analyzed using horizontal to vertical spectral ratio (HVSR) method to determine the natural frequencies of the alluvium; primary and secondary waves velocitywere also measured as a complementarydata. The survey results concluded to the preliminary seismic site classification map for the city, which would be useful for future safe design of structures.

Keywords


Seismic site classification; Geophysical surveys; Microtremor measurements

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References


International Institute of Earthquake Engineering and Seismology (2017) Suggestions for Design Ear thquake and Soil Type Preference in Sarpol-e Zahab Area. www.iiees.ac.ir.

Building and Housing Research Center (2014) Standard No. 2800 Iranian Code of Practice for Seismic Resistant Design of Buildings. Fourth Revision, Tehran.

Desai, C.S. (1976) Numer ical Methods in Geomechanics (No. CONF-760625-P2). American Society of Civil Engineers, New York, NY.

Kramer, S.L. (1996) 'Geotechnical earthquake engineering'. In: International Series in Civil Engineering and Engineering Mechanics. Prentice-Hall, New Jersey.

Technical Committee for Earthquake Geotechnical Engineering, TC4, ISSMGE (1999) Manual for Zonation on Seismic Geotechnical Hazards (Revised Ver sion). Japanese Geotechnical Society.

United Nations Institute for Training andResearch, Satellite image and analysis (2017) Maps and Data.

Kanai, K. and Tanaka, T. (1961)Onmicrotremors. Bull. Earthq. Res. Inst., 39(VIII), 97-114.

Nogoshi, M. and Igarashi, T. (1971) On the amplitude characteristics of microtremor (part 2). J. Seismol. Soc. Jpn., 24, 26-40 (in Japanese with English Abstract).

Nakamura, Y. (1989) A method for dynamic characteristics estimation of subsurface using microtremor on the ground surface. Q. Rep. Railw. Tech. Res. Inst., 30(1), 25-30.

Ansal, A. (ed.) (2015) Perspectives on european earthquake engineering and seismology. Geotechnical, Geological and Earthquake Engineering, 39, DOI 10.1007/978-3-319-16964-4_15.

Molnar, S., Cassidy, J.F., Castellaro, S., Cornou, C., Crow, H., Hunter, J.A., Matsushima, S., Sanchez-Sesma, F.J., and Yong, A. (2018)

Application of Microtremor Horizontal-to-Vertical Spectral Ratio (MHVSR) analysis for site characterization: State of the Art. Surveys in Geophysics, 39(2), 613. https://doi.org/10.1007/s10712-018-9464-4.

Center of Molecular Electronics of the Moscow Institute of Physics and Technology, Moscow, Russia.

Lennartz Electronic (1983) Manual for PCM5800 Encoder. Tübingen, Germany, 189p.

Wathelet, M. (2006) Geopsy Software Manual. Technical Report, SESAME European Project.

Dobry, R., Borcherdt, R.D., Crouse, C.B., Idriss, I.M., Joyner, W.B., Martin, G.R., Power, M.S., Rinne, E.E., and Seed, R.B. (2000) New sitecoefficients and site classification system used in recent building seismic code provisions. Earthquake Spectra, 16(1), 41-67.


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