Evaluation of the effect of alluvial and ground classification in Mashhad City, according to spectra ratio of microtermor waves method

Document Type : مقالات پژوهشی

Authors

• Naser Hafezi Moghaddas ¹
• Mohammad Reza Ghaemmaghamian ²
• Azam Ghazi ³

¹ Faculty of Earth Science, Shahrood University of Technology

² International Institute of Earthquake Engineering and Seismology

³ Ferdowsi University of Mashhad, Mashhad, Iran

10.22067/sed.facies.v1i1.730

Abstract

In this paper, the results of evaluation of earthquakes site effect using the microtremor measurement, which have been obtained from 200 points in Mashhad city, are presented. Also by combination of the iso-resonance period and soil texture map, the ground classifieation map has produced according to the Iranian code of practice for seismic resistant design of buildings (2800 standard). This map shows that the resonance period of ground increase from south and west toward the center and east of city. But it decreases toward the north near Mashhad north fault in Khajeh Rabi area. Based on the Iranian 2800 standard, the south and south western parts of Mashhad city are classified in IB and IIB, while the central classified in IIIB, north part classified in IIB and limited area in east and north- east have a IV classes.

Keywords

• Site effect
• Microtremor
• Spectral ratio
• Mashhad city

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References

حافظی مقدس، ن.، 1385. معرفی گسل شمال مشهد. بیست و پنجمین گردهمایی علوم زمین، سازمان زمین شناسی و اکتشافات معدنی کشور.

حافظی مقدس، ن.، 1386. گزارش مطالعات ریز پهنه بندی لرزه ای شهر مشهد، جلد دوم. گزارش زمین شناسی مهندسی، سازمان مسکن و شهرسازی خراسان رضوی.

قرشی، م. مهدویان، ع.، 1384. گزارش ریز پهنه بندی لرزه ای شهر مشهد، جلد اول، مطالعات تحلیل خطر. سازمان مسکن و

شهرسازی خراسان رضوی.

مرکز تحقیقات ساختمان و مسکن، 1378. آیین نامه طراحی ساختمانها در برابر زلزله، استاندارد 2800. نشریه شماره ض-253.

Al Yuncha, Z., & Luzon, F., 2000. On horizontal to vertical spectral ratio in sedimentary basins. Bull. Seismo. Soci. Am., 90:1101-1106.

Borcherdat, R.D., & Gibbs, J.F., 1976. Effects of local geological conditions in the San Francisco Bay region on ground motions and the intensities of the 1906 earthquake. Bull. Seis. Soc. Am., 66:467-500.

Borcherdt, R., & Glassmoyer, G., 1992. On the characteristics of local geology and their influence on ground motion generated by the Loma Prieta earthquake in the San Francisco. Bull. Seism. Soc. Am., 82:603-641.

Bozdag, E., & Kocaoglu, A.H., 2005. Estimation of site amplifications from shear-wave velocity profiles in Ye¸Silyurt and Avcilar, Istanbul, by frequency–wave number analysis of microtremors. Journal of Seismology., 9:87-98.

Cara, F., Di Giulio, G., & Rovelli, A., 2003. A Study on seismic noise variations at Colfiorito, Central Italy: Implications for the use of H/V Spectral Ratios. Geophysical Research Letters, 30, NO. 0, XXXX, doi: 10.1029/2003GL017807.

Chavez-Garcia, F.J., 1994. Site effects in Mexico City eight years after the September 1985 Michoacan earthquakes. Soil. Dyn. Earthquake Eng. 13:229-247.

Ergin, M., Zalaybey, S.O., Aktar, M., & Yalc, M.N., 2004. Site amplification at AvcVlar, Istanbul. Tectonophysics, 391:335– 346.

Huang, H.C., Yang, Y.T., & Chiu, H.C., 2002. Site response evaluation using H/V ratio at the Yan-Liau in Hualien. Taiwan, Pure and Applied Geophysics, 159:2715-2731.

Jarpe, S.P., Hutchings, L.J., Hauk, T.F., & Shakal, F., 1989. Selected strong and weak motion data from the Loma Prieta earthquake sequence. Seism, Res. Lett., 60:167-176.

Lachet, C. & Bard, P.Y., 1994. Numerical and theoretical investigations on the possibilities and limitations of Nakamura’s Technique. J. Phys. Earth., 42:377-397.

Nakamura, Y., 1989. A method for dynamic characteristics estimation of subsurface using microtremor on the ground surface. Qr of RTRI, 30(1).

Panou, A.A., 2004. Ambient noise horizontal to vertical spectral ratio for assessing site effect in urban environments: The case of Thessaloniki city (northern Greece). Bull. Geo. Soci. Gr., XXXVI:1467-1476.

Seed, H.B., Romo, M.P., Sun, J.I., Jaime, A., & Lysmer, J., 1988. The earthquake of September 19, 1985 relationship between soil conditions and earthquake ground motion. Earthquake Spectra, 4:687-729.

Seed, R.B., Dickenson, S.E., & Mok, C., 1991. Seismic response analysis of soft and deep cohesive stations: A brief summary of recent findings. First Annual Seismic Response Workshop, Sacramento, California, December 3-4.

Teves-Costa, P., Matias, L., & Bard, P.Y., 1996. Seismic behavior estimation of thin alluvium layers using ambient noise recordings. Soil Dyn. Earthq. Eng, 15:201-209.

Tezcan, S.S., Kaya, E., Bal, I.E., & Ozdemir, Z., 2002. Seismic amplification at Avcilar Istanbul. Engineering Structure, 24:661-667.

Tucker, B.E., & King, J.L., 1984. Dependence of sediment-filled valley response on input amplitude and valley properties. Bull. Seismo. Soci. Am., 74:153-165.