بررسی اثرات حوزه نزدیک و جهت‌پذیری در مطالعات تحلیل‌خطر زلزله – مطالعه موردی گسل دورود

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش‌آموخته کارشناسی ارشد، گروه فیزیک زمین، مؤسسه ژئوفیزیک، دانشگاه تهران، تهران، ایران

2 دانشیار، گروه فیزیک زمین، مؤسسه ژئوفیزیک، دانشگاه تهران، تهران، ایران

3 دانشجوی کارشناسی ارشد، گروه فیزیک زمین، مؤسسه ژئوفیزیک، دانشگاه تهران، تهران، ایران

چکیده

در این مطالعه، با توجه به واقع شدن شهر دورود در حوزه نزدیک گسل دورود، اثرات حوزه نزدیک و جهت‌پذیری ناشی از آن بررسی شده است. اثرات حوزه نزدیک و جهت‌پذیری، می‌تواند منجر به ایجاد پالس‌های پریودبلندی در جنبش زمین شده و برای ساختارهایی با پریودبلند از قبیل پل‌ها که در نزدیکی گسل‌هایی با نرخ فعالیت بالا هستند، گنجاندن اثرات جهت‌پذیری در روابط کاهندگی می‌تواند تأثیر زیادی در نتایج تحلیل‌خطر لرزه‌ای واقع‌گرایانه داشته باشد. گسل دورود در هنگام رخداد زمین‌‌لرزه برای پریود‌های بلند در محدوده شهر دورود، می‌تواند موجب تشدید پارامترهای جنبش زمین شده و باعث خسارات جدی در این محدوده ‌شود. در این مطالعه، پارامتر‌های جنبش نیرومند زمین در تحلیل‌خطر احتمالاتی زمین‌‌لرزه با اعمال جهت‌پذیری برای محدوده گسل دورود برآورد شده است. همچنین با بررسی واهمافزایی خطر زمین‌‌لرزه، تأثیر جهت‌پذیری برای میزان مشارکت فاصله و بزرگا در برآورد پارامتر شتاب جنبش زمین ارزیابی شده است. در دوره بازگشت‌های بلند‌مدت و کوتاه‌مدت، تأثیر جهت‌پذیری برای پریود‌های مختلف برای پارامتر شتاب جنبش نیرومند زمین با روش سامرویل و آبراهامسون برآورد و موردارزیابی قرار گرفته است. مقدار شتاب برآوردشده برای سه دوره بازگشت، 50، 475 و 2475 سال و در پریود‌های 75/0، 1، 2، 3 و 4 محاسبه و ارزیابی شده است. مقدار پارامتر شتاب جنبش زمین با افزایش دوره بازگشت و پریود رابطه مستقیم داشته به‌طوری‌که بیشترین مقدار افزایش شتاب با تأثیر جهت‌پذیری، در دوره بازگشت 2475 سال و در پریود 4 ثانیه، 16/17 درصد محاسبه شد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation of the near-field and directivity effects in earthquake hazard analysis studies - a case study of Doroud fault

نویسندگان [English]

  • Behzad Maleki 1
  • Habib Rahimi 2
  • Mohammad Reza Hosseini 3
1 M.Sc. Graduated, Department of Earth Physics, Institute of Geophysics, University of Tehran, Tehran, Iran
2 Associate Professor, Department of Earth Physics, Institute of Geophysics, University of Tehran, Tehran, Iran
3 M.Sc. Student, Department of Earth Physics, Institute of Geophysics, University of Tehran, Tehran, Iran
چکیده [English]

In this study, considering the location of Dorud city in the area near the strike-slip and seismic fault of Doroud, the effects of the near site and the directivity due to rupture have been investigated in seismic hazard analysis studies.
Doroud fault is located near the cities of Doroud and Boroujerd, in the western part of Iran. Dorud and Boroujerd are among the important cities of Iran in the agricultural industry and also due to the pristine nature in these areas has always been of interest to tourists. The micro-earthquakes recorded in this area indicate the activity of the Doroud fault system. In order to prevent possible earthquake damage in this area, seismicity studies can be useful to study the acceleration of the ground by considering the effects of the site in order to strengthen the construction of civil structures.
Abrahamson (2000) and Somerville et al., (1997) were among the first researchers to establish studies based on this, and the relationships and methods proposed by them are more acceptable today in applying the directional effect. These researchers considered two parameters of angle and ratio of fault length as a direct factor in the effect of orientation and examined the results for the acceleration spectrum created. The effect of orientation can lead to the formation of long-period pulses in the earth's motion, which some proposed models (eg Somerville et al., 1997) can measure the quantity of this effect in estimating earthquake risk analysis with a deterministic and probabilistic approaches. (Abrahamson, 2000). In this study, seismic hazard has been investigated, compared and evaluated by considering the effects of Doroud fault in different periods and different return periods by considering the effect of orientation and also without applying the effect of orientation.
Near-field and directional effects can lead to long-period pulses in ground motion parameter, and for structures with long periods such as bridges and dams near faults with high activity rates. The inclusion of directional effects in attenuation relationships, to see whether for deterministic and probabilistic approach can have a great impact on the results of realistic seismic hazard analysis. Doroud fault is one of the most important faults in Iran with a history of large earthquakes in the early instrumental period and its mechanism of strike-slip mechanism, It can intensify the strong motion parameters during earthquakes for long periods in the city of Dorud, and consequently cause serious damage to structures with long periods in this area.
In this study, the parameters of strong ground motion in the analysis of probabilistic earthquake hazard by applying direction for the range of Doroud fault have been estimated. In addition, by examining the disaggregation of earthquake hazard, the effect of direction for the contribution of distance and magnitude in estimating the strong motion parameter has been evaluated. In the short and long return periods, the effect of directivity for different periods for the strong motion has been estimated and evaluated by the Somerville and Abrahamson method. The estimated acceleration is calculated and evaluated for three return periods, 50, 475 and 2475 years and in periods of 0.75, 1, 2, 3 and 4 sec. The value of the strong motion parameter was directly related to the increase of the return period and the period, so that the highest amount of acceleration increase (17.16 percentage) with the effect of directivity was calculated in the return period of 2475 years and in the 4-second period.

کلیدواژه‌ها [English]

  • Near-field
  • directional effects
  • Doroud fault
  • Dorud city
  • Hazard

مراجع

شیخ الاسلامی، م. ر.، 1393، «دانشنامه گسل‌های ایران». سازمان زمین‌شناسی واکتشاف معدنی کشور.
Abrahamson, N. A., 2000, Effects of rupture directivity on probabilistic seismic hazard analysis. In: Proc. 6th Int. Conf. Seismic Zonation, Palm Springs, CA, 12-15 November 2000, Earthquake Engineering Research Institute.
Abrahamson, N.A., Kamai, R. and Silva, W.J., 2014, Nonlinear Horizontal Site Amplification for Constraining the NGA-West2 GMPEs. Earthquake Spectra, 30(3), 1223-1240.
Adanur, S., Altunişik, A.C. and Bayraktar, A., 2012, Comparison of near-fault and far-faultground motion effects on geometricallynonlinear earthquake behavior of suspensionbridges. Nat Hazards 64, 593–614.
Alipoor, R., Zare, M. and Ghassemi, M.R., 2012, Inception of activity and slip rate on the Main Recent Fault of Zagros Mountains, Iran. Geomorphology, s 175–176, 86–97.
Ambraseys, N. N. and Jackson, J. A., 1998, Faulting associated with historical and recent earthquakes in the eastern Mediteranean region, Geophys. J. Int., 133, 390-406.
Ambraseys, N.N. and Melville, C.P., 1982, A History of Persian Earthquakes, Cambridge Univ. Press, New York, p. 219.
Bachmanov, D. M., Trifonov, V. G., Hessami, Kh. T., Kozhurin, T. P., Rogozhin, E. A., Hademi, M. C. and Jamali, F. H., 2004, Active faults in the Zagros and central Iran, Tectenophysics, 380, 221-241.
Berberian, M., 1976, contribution to the seismotectonic of iran (Part II). Geol. Surv. Iran, Rep.39.
Chiou, B.S.-J. and Youngs, R.R., 2014, Update of the Chiou and Youngs NGA model for the average horizontal component of peak ground motion and response spectra. Earthquake Spectra, 30, 1117-1153.
Cornell, C. A., 1968, Engineering seismic risk analysis, Bull. Seism. Soc. Am. 58, 1583-1606.
Boore D.M; Jonathan P. Stewart, Emel Seyhan and Gail Atkinson, M., 2014, NGA-West2 Equations for Predicting PGA, PGV, and 5% Damped PSA for Shallow Crustal Earthquakes. Earthquake Spectra 30)3(, 1057-1085.
Gardner, J. K. and Knopo, L., 1974, Is the sequence of earthquakes in Southern California, with aftershocks removed, Poissonian? Bull. Seis. Soc. Am., 64(5), 1363-1367.
Gidon, M., Berthier, F., Billiault, J.P., Halbronn, B. and Maurizot, P., 1974. Sur le carateres et l'ampleur du coulissement de la ‘Main Fault’ dans la region de Borujerd–Dorud, Zagros oriental, Iran. Comptes Rendus de l'Académie des Sciences Paris, Série D 278, 701–704.
Gutenberg, B. and Richter, C.F., 1956, Earthquake Magnitude, Intensity, Energy and Acceleration. Bull. Seism. Soc. Am., 46, 105-145.
Grünthal, G., 1998, European Macroseismic Scale 1998 (EMS-98),Cahiers du Centre Européen de Géodynamique et de Séismologie 15,Centre Européen de Géodynamique et de Séismologie, Luxembourg, P. 99.
Harzell, S.H. and Heaton, T.H., 1985, Teleseismic time function for large, shallow subduction zone earthquake, Bull. Seismol.Soc. Am., 75, 965-1004.
Haskell, N. 1964, Total energy and energy spectral density of elastic wave radiation from propagating faults, Bull. Seismol. Soc. Am., 56, 1811 –1842.
Hessami, K., Jamali, F. and Tabassi, H., 2003. Major active faults of Iran, scale 1: 2,500,000. International Institute of Earthquake Engineering and Seismology.
Idriss, I. M., 2014, An NGA-West2 Empirical Model for Estimating the Horizontal Spectral Values Generated by Shallow Crustal Earthquakes. Earthquake Spectra: August 2014, 30(3), 1155-1177.
Campbell, K. W. and Bozorgnia, Y., 2014, NGA-West2 Ground Motion Model for the Average Horizontal Components of PGA, PGV, and 5% Damped Linear Acceleration Response Spectra. Earthquake Spectra: August 2014, 30 (3), 1087-1115.
Kijko, A. 2004, Estimation of the maximum earthquake magnitude, m max. Pure Appl Geophys, 161(8), 1655–1681.
Lay, T. and Wallace, T., 1995, Modern global seismology. InternationalGeophysics Series. Academic, USA, p. 58.
Maleki, B. Rahimi, H., and Maleki, V., 2019, Applying the characteristic magnitude distribution Model for North Tabriz Fault (NTF) in Probabilistic Seismic Hazard Assessment (PSHA) and its effects on acceleration parameter and hazard curve. Journal of the Earth and Space Physics, 45(3), P. 4.
McKenzie, D.P. and Jackson, J.A., 1972, The relation between strain rates, crustal thickening, paleomagnetism, finite strain and fault movements within a deforming zone, Earth planet. Sci. Lett., 65, 182–202.
McKenzie, D.P., 1972, Active tectonics of the Mediterranean region, Geophys. J. R. astr. Soc., 30, 109–185.
Mirzaei, N., Gao, M. and Chen, Y. T., 1998, Seismic source regionalization for seismic zoning of Iran: Major seismotectonic provinces; J. Earthquake. Pred. Res. 7 465–495.
Mousavi-Bafrouei, S. H., Mirzaei, N. and Shabani, E., 2014, A declustered earthquake catalog for Iranian plateau, Annals of Geophysics, under review.Shahvar, M. P., M. Zare, and S. Castellaro (2013). A unified seismic catalog for the Iranian plateau (1900–2011), Seismol. Res. Lett. 84, 233–249.
Nowroozi, A. A., 1985, Empirical relations between magnitudes and fault parameters for earthquakes in Iran, Bull. Seism. Soc. Am., 75(5), 1327-1338.
Somerville, P.G., 2003, Magnitude scaling of the near fault rupture directivity pulse, Physics of the Earth and Planetary Interiors 137, 201–212.
Shirakova, E.I., 1967, General features in the orientation of principal stresses in earthquake foci in the Mediterranean–Asian seismic belt, Earth Phys., 1, 22–36.
Shrestha, B. and Tuladhar, R. 2012, No AccessThe response of Karnali Bridge, Nepal to near-fault earthquakes. 165(4), 223-232.
Somerville, P.G., Smith N.F., Graves R.W. and Abrahamson N.A., 1997, Modification of empirical strong motion attenuation relations to include the amplitude and duration effect of rupture directivity. Seismol. Res. Lett., 68, 199-222.
Talebian, M. and Jackson, J., 2002, Offset on the Main Recent Fault of NW Iran and implications for the late Cenozoic tectonics of the Arabia–Eurasia collision zone. Geophys. J. Int., 150, 422–439.
Tchalenko, J. S. and Braud, J., 1974, Seismicity and structure of the Zagros (Iran): the Main Recent Fault between 33o and 35oN, Philos. Roy. Soc. Lond., 227, 1-25.
Tchalenko, J.S., Braud, J. and Berberian, M., 1974, Discovery of three earthquake faults in Iran. Nature 248, 661– 663.
Urhammer, S. A., Clausen, J. O., Hansen, T., Pedersen, O., 1996, Insulin sensitivity and body weight changes in young white carriers of the codon 64 amino acid polymorphism of the beta 3-adrenergic receptor gene. Diabetes., 45, 1115–20.
Vader, T. and Daniel, C.C. 2007, Influence of Dampers on Seismic Response of Cable-Supported Bridge Towers. Journal of Bridge Engineering. ISSN (print): 1084-0702.
Wells, D.L. and Coppersmith, K.J., 1994, “New empirical relationships among magnitude, rupture length, rupture width, rupture area, and surface displacement,” Bull. Seism. Soc. Am., 84, 974-1002.
فیزیک زمین و فضا
دوره 47، شماره 1
اردیبهشت 1400
صفحه 41-57

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