Attenuation of Fourier spectra for 2012 Ahar–Varzaghan earthquakes, Northwestern Iran

Authors

1 Postdoctoral Researcher, Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Japan

2 Professor, Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Japan

3 Professor, Department of Civil Engineering, Gifu University, Gifu, Japan

Abstract

In this research, we have used 102 strong motion recordings from 2012 Ahar-Varzaghan earthquakes (Mw=6.5 and Mw=6.3) to study the form of attenuation of shear wave Fourier amplitude spectra of those two events. The analysis is carried out in a broad-band frequency range from 0.1 to 20 Hz. A bilinear shape for geometrical spreading is assumed based on nonparametric regression of the data. The hinge point of the bilinear shape is around 60 km away from the earthquake source; the geometric spreading forms for the first and second segments are R-0.9 and R-0.5, respectively. The results of this study show that there is considerable dependency of the rate of geometrical spreading on frequency. If only frequencies above 1 Hz are considered, the first segment of geometrical spreading will have a slope steeper than R-1. In contract, for lower frequencies it has a gentle slope. The associated quality factor for the assumed shape of geometrical spreading (appropriate for frequencies logarithmically spaced between 0.1 to 20 Hz) is Q(f)=148 f 0.62. The estimated Q(f) in this study agrees well with the other estimated shear wave quality factors in the region; however, if the whole attenuation model (consisted of geometrical spreading and quality factor) is considered, there will be conspicuous differences between different models.

Keywords

Main Subjects

References

Akkar, S., 2008, An introduction to utility
software for data processing (USDP), in
4th BSHAP Project Workshop, Budva,
Montenegro.
Akkar, S. and Bommer, J. J., 2006, Influence
of long-period filter cut-off on elastic
spectral displacements, Earthquake
Engineering & Structural Dynamics,
35(9), 1145-1165.
Allen, T. I., Cummins, P. R., Dhu, T. and
Schneider, J. F., 2007, Attenuation of
ground-motion spectral amplitudes in 
Southeastern Australia, Bulletin of the Seismological Society of America, 97(4), 1279-1292.
Anderson, J. G. and Hough, S. E., 1984, A model for the shape of the Fourier amplitude spectrum of acceleration at high frequencies, Bulletin of the Seismological Society of America, 74(5), 1969-1993.
Atkinson, G. M., 1993, Earthquake source spectra in eastern North America, Bulletin of the Seismological Society of America, 83(6), 1778-1798.
Atkinson, G. M., 2004, Empirical attenuation of ground-motion spectral amplitudes in southeastern Canada andthe northeastern United States, Bulletin of the Seismological Society of America, 94(3), 1079-1095.
Atkinson, G. M., 2012, Evaluation of attenuation models for the Northeastern United States/Southeastern Canada, Seismological Research Letters, 83(1), 166-178.
Atkinson, G. M., Assatourians, K., Boore, D. M., Campbell, K. and Motazedian, D., 2009, A guide to differences between Stochastic point-source and Stochastic finite-fault simulations, Bulletin of the Seismological Society of America, 99(6), 3192-3201.
Atkinson, G. M. and Boore, D. M., 1995, Ground-motion relations for eastern North America, Bulletin of the Seismological Society of America, 85(1), 17-30.
Atkinson, G. M. and Boore, D. M., 2014, The attenuation of Fourier amplitudes for rock sites in Eastern North America, Bulletin of the Seismological Society of America, 104(1), 513-528.
Atkinson, G. M. and Mereu, R. F., 1992, The shape of ground motion attenuation curves in southeastern Canada, Bulletin of the Seismological Society of America, 82(5), 2014-2031.
Atkinson, G. M. and Silva, W., 2000, Stochastic modeling of California ground motions, Bulletin of the Seismological Society of America, 90(2), 255-274.
Babaie Mahani, A. and Atkinson, G. M., 2012, Evaluation of functional forms for the attenuation of small-to-moderate-earthquake response spectral amplitudes in North America, Bulletin of the Seismological Society of America, 102(6), 2714-2726.
Beresnev, I. A., Atkinson, G. M., Johnson, P. A. and Field, E. H., 1998, Stochastic finite-fault modeling of ground motions from the 1994 Northridge, California, earthquake. II. Widespread nonlinear response at soil sites, Bulletin of the Seismological Society of America, 88(6), 1402-1410.
Boatwright, J., Fletcher, J. B. and Fumal, T. E., 1991, A general inversion scheme for source, site, and propagation characteristics using multiply recorded sets of moderate-size earthquakes, Bulletin of the Seismological Society of America, 81(5), 56 pp.
Boore, D. M., 1983, Stochastic simulation of high-frequency ground motions based on seismological models of the radiated spectra, Bulletin of the Seismological Society of America, 73(6A), 1865-1894.
Boore, D. M., 1999, Effect of baseline corrections on response spectra for two recordings of the 1999 Chi-Chi, Taiwan, earthquake, in Geological Survey, Open-File Report, 37.
Boore, D. M., 2001, Effect of baseline corrections on displacements and response spectra for several recordings of the 1999 Chi-Chi, Taiwan, earthquake, Bulletin of the Seismological Society of America, 91(5), 1199-1211.
Boore, D. M., 2003, Simulation of ground motion using the stochastic method, Pure and applied Geophysics, 160(3-4), 635-676.
Boore, D. M., 2005, SMSIM---Fortran programs for simulating ground motions from earthquakes: Version 2.3---A Revision of OFR 96-80-A", in US Geological Survey open-file report, 59.
Boore, D. M., 2008, TSPP—A collection of FORTRAN programs for processing and manipulating time series, US Geological Survey open-file report, 1111(56), 154-1782.
Boore, D. M., 2012, Updated determination of stress parameters for nine well-recorded earthquakes in Eastern North America, Seismological Research Letters, 83(1), 190-199.
Boore, D. M. and Bommer, J. J., 2005, Processing of strong-motion accelerograms: needs, options and
consequences, Soil Dynamics and Earthquake Engineering, 25(2), 93-115.
Boore, D. M., Campbell, K. W. and Atkinson, G. M., 2010, Determination of stress parameters for eight well-recorded earthquakes in Eastern North America, Bulletin of the Seismological Society of America, 100(4), 1632-1645.
Boore, D. M., Joyner, W. B. and Fumal, T. E., 1997, Equations for estimating horizontal response spectra and peak acceleration from western North American earthquakes: a summary of recent work, Seismological Research Letters, 68(1), 128-153.
Boore, D. M., Stephens, C. D. and Joyner, W. B., 2002, Comments on baseline correction of digital strong-motion data: examples from the 1999 Hector Mine, California, earthquake, Bulletin of the Seismological Society of America, 92(4), 1543-1560.
Brune, J. N., 1970, Tectonic stress and the spectra of seismic shear waves from earthquakes, Journal of Geophysical Research, 75(26), 4997-5009.
Brune, J. N., 1971, Tectonic stress and the spectra of seismic shear waves from earthquakes: correction, Journal of Geophysical Research, 76(5002),
Castro, R., Anderson, J. and Singh, S., 1990, Site response, attenuation and source spectra of S waves along the Guerrero, Mexico, subduction zone, Bulletin of the Seismological Society of America, 80(6A), 1481-1503.
Chiou, B., Darragh, R., Gregor, N. and Silva, W., 2008, NGA project strong-motion database, Earthquake Spectra, 24(1), 23-44.
Cleveland, W. S., 1979, Robust locally weighted regression and smoothing scatterplots, Journal of the American Statistical Association, 74(368), 829-836.
Cleveland, W. S., 1993, Visualizing data, Hobart Press.
Darragh, B., Silva, W. and Gregor, N., 2004, Strong motion record processing for the PEER center, in Proceedings of COSMOS Invited Workshop on Strong-Motion Record Processing, Richmond, Calif, USA, 26-27.
Hamzehloo, H., Rahimi, H., Sarkar, I., Mahood, M., Alavijeh, H. M. and Farzanegan, E., 2010, Modeling the strong ground motion and rupture characteristics of the March 31, 2006, Darb-e-Astane earthquake, Iran, using a hybrid of near-field SH-wave and empirical Green’s function method, Journal of Seismology, 14(2), 169-195.
Hassani, B., Zafarani, H., Farjoodi, J. and Ansari, A., 2011, Estimation of site amplification, attenuation and source spectra of S-waves in the East-Central Iran, Soil Dynamics and Earthquake Engineering, 31(10), 1397-1413.
Herrmann, R. B. and Kijko, A., 1983, Modeling some empirical vertical component Lg relations, Bulletin of the Seismological Society of America, 73(1), 157-171.
Iran Strong Motion Network (ISMN) homepage. [Last accessed May 2014]; Available from: www.bhrc.ac.ir/Portal/ISMN
Iranian Seismological Center (IRSC) homepage. [Last accessed May 2014]; Available from: http://irsc.ut.ac.ir/
Joyner, W. B. and Boore, D. M., 1981, Peak horizontal acceleration and velocity from strong-motion records including records from the 1979 Imperial Valley, California, earthquake, Bulletin of the Seismological Society of America, 71(6), 2011-2038.
Lermo, J. and Chávez-García, F. J., 1993, Site effect evaluation using spectral ratios with only one station, Bulletin of the Seismological Society of America, 83(5), 1574-1594.
Ma’hood, M., Hamzehloo, H. and Doloei, G. J., 2009, Attenuation of high frequency P and S waves in the crust of the East-Central Iran, Geophysical Journal International, 179(3), 1669-1678.
Macias, M., Atkinson, G. M. and Motazedian, D., 2008, Ground-Motion Attenuation, Source, and SiteEffects for the 26 September 2003 M 8.1 Tokachi-Oki earthquake sequence, Bulletin of the Seismological Society of America, 98(4), 1947-1963.
Meghdadi, A. and Shoja-Taheri, J., 2014, Ground-motion attenuation and source spectral shape for earthquakes in Eastern Iran, Bulletin of the Seismological Society of America, 104(2), 624-633.
Attenuation of Fourier spectra for 2012 Ahar–Varzaghan… 37
Mirzaei Alavijeh, H., Sinaiean, F., Farzanegan, E. and Sadeghi Alavijeh, M., 2007, Iran strong motion network (ISMN) prospects and achievements, in Proceedings of the 5th International Conference on Seismology and Earthquake Engineering, Tehran.
Motaghi, K. and Ghods, A., 2012, Attenuation of ground-motion spectral amplitudes and its variations across the Central Alborz Mountains, Bulletin of the Seismological Society of America, 102(4), 1417-1428.
Motazedian, D., 2006, Region-specific key seismic parameters for earthquakes in Northern Iran, Bulletin of the Seismological Society of America, 96(4A), 1383-1395.
Motazedian, D. and Atkinson, G. M., 2005, Stochastic finite-fault modeling based on a dynamic corner frequency, Bulletin of the Seismological Society of America, 95(3), 995-1010.
Nayak, A., Kumar, Nath, S., Kumar Singh Thingbaijam, K. and Baruah, S., 2011, New insights into path attenuation of ground motions in Northeast India and Northwest Himalayas, Bulletin of the Seismological Society of America, 101(5), 2550-2560.
Raoof, M., Herrmann, R. and Malagnini, L., 1999, Attenuation and excitation of three-component ground motion in southern California, Bulletin of the Seismological Society of America, 89(4), 888-902.
Samaei, M. and Miyajima, M., 2016, Source spectra of 2012 Ahar-Varzaghan double earthquakes, Northwestern Iran, Journal of Seismology and Earthquake Engineering, (In review).
Samaei, M., Miyajima, M., Tsurugi, M. and Fallahi, A., 2013, Source and path parameters for recorded earthquakes in Tehran Province, Iran, Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)), 69(4), I_980-I_988.
Samaei, M., Miyajima, M. and Yazdani, A., 2014, Prediction of strong ground motion using Stochastic finite fault method: a case study of Niavaran fault, Tehran, Geodynamics Research International Bulletin, 2(3), 13-23 (In Persian).
Sinaeian, F., Mirzaei Alavijeh, H. and Farzanegan, E., 2010, Site geology investigation in accelerometric stations using seismic refraction method in Ardebil and East Azarbayejan Provinces, Vol. 2, 50 stations, Center of Iran, Tehran, Iran, in BHRC Publication No. R-532, Building and Housing Research.
Street, R. L., Herrmann, R. B. and Nuttli, O. W., 1975, Spectral characteristics of the Lg wave generated by central United States earthquakes, Geophysical Journal International, 41(1), 51-63.
Taghizadeh-Farahmand, F., Sodoudi, F., Afsari, N. and Ghassemi, M. R., 2010, Lithospheric structure of NW Iran from P and S receiver functions, Journal of seismology, 14(4), 823-836.
Tsurugi, M., 2013, Strong ground motion prediction for scenario earthquakes, 207-223.
Wang, C. and Herrmann, R., 1980, A numerical study of P-, SV-, and SH-wave generation in a plane layered medium, Bulletin of the Seismological Society of America, 70(4), 1015-1036.
Wang, G.-Q., Boore, D. M., Igel, H. and Zhou, X.-Y., 2003, Some observations on collocated and closely spaced strong ground-motion records of the 1999 Chi-Chi, Taiwan, earthquake, Bulletin of the Seismological Society of America, 93(2), 674-693.
Zafarani, H., Hassani, B. and Ansari, A., 2012, Estimation of earthquake parameters in the Alborz seismic zone, Iran using generalized inversion method, Soil Dynamics and Earthquake Engineering, 42, 197-218.
Zafarani, H., Rahimi, M., Noorzad, A., Hassani, B. and Khazaei, B., 2015, Stochastic simulation of strong‐motion records from the 2012 Ahar–Varzaghan Dual earthquakes, Northwest of Iran, Bulletin of the Seismological Society of America.
Zaré, M. and Bard, P.-Y., 2002, Strong motion dataset of Turkey: data processing and site classification, Soil Dynamics and Earthquake Engineering, 22(8), 703-718.

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