تجزیه و تحلیل فرکتالی پسلرزههای زمینلرزه 1392 گشت-سراوان، شمال شرق مکران
الموضوعات :عبدالرضا پرتابیان 1 , شجاع انصاری 2 , فریده جهاندیده 3
1 - دانشگاه سیستان و بلوچستان
2 - اداره کل زمینشناسی و اکتشافات معدنی گیلان
3 - دانشگاه سیستان و بلوچستان
الکلمات المفتاحية: مکران# پهنه فرورانش# پسلرزه# لرزهخیزی# بعد فرکتال#,
ملخص المقالة :
در این پژوهش بعد فرکتالی پسلرزههای زمینلرزه سال 1392 گشت – سراوان و ارتباط آن با پارامترهای لرزهخیزی (b-value) همچنین نسبت انرژی منتشر شده توسط زمینلرزه اصلی و پسلرزهها مورد بررسی قرار گرفته است. زمینلرزه اصلی، یک زمینلرزه درون ورقه فرورونده با سازوکار نرمال بوده و ناشی از فعالیت گسل سراوان نمیباشد. بررسی بعد فرکتالی پسلرزهها و ارتباط آن با b-value وجود یک منبع لرزهای خطی نظیر پهنه فرورانش را تایید مینماید. از طریق بعد فرکتال میتوان نسبت لغزش در گسلهای اصلی و ثانویه را نیز برآورد نمود. این نسبت نشان میدهد که بخش کمی از لغزشها از طریق گسلهای نزدیک به سطح زمین صورت گرفته است که این موضوع از طریق عمق پسلرزههای رخ داده در نزدیکی این گسلها قابل تایید میباشد. بنابراین وقوع زمینلرزه اصلی در عمق زیاد موجب آزاد شدن انرژی و انتقال آن به اعماق کم و فعال نمودن گسلها و شکستگیها شده است که رخداد پسلرزهها هم در اعماق نزدیک به زمینلرزه اصلی و هم در اعماق کم و نزدیک به سطح زمین میتواند تایید کننده آن باشد. نسبت کل انرژی منتشر شده در طی توالی پسلرزههای زمینلرزه گشت-سراون به انرژی منتشر شده توسط زمینلرزه اصلی نشان می دهد که قسمت اعظم انرژی منتشر شده مربوط به زمینلرزه اصلی بوده و تنها درصد کمی مربوط به پسلرزهها میباشد.
Aki, K., 1965. Maximum likelihood estimate of b in the formula log N = a-bM and its confidence limits. Bulletin of the Earthquake Research Institute. 43, 237–239.
-Ansari, S. and Zamani, A., 2014. Short-term seismic crustal deformation of Iran. Annals of Geophysics, 57,2, 0210. doi.org/10.4401/ag-6413.
-Ansari, S., 2016. Co-seismic stress transfer and magnitude-frequency distribution due to the 2012 Varzaqan-Ahar earthquake doublets (Mw 6.5 and 6.4), NW Iran. Journal of Asian Earth Sciences, 132, 129-137.
-Ansari, S., 2017. Aftershocks properties of the 2013 Shonbe Mw6.3 earthquake, central Zagros, Iran. Journal of Asian Earth Sciences. 147, 17–27.
-Ashtari Jafari, M., 2014. The 16 April 2013 Mw7. 8 Ghosht, Iran earthquake. Journal of Asian Earth Sciences, 87, 26-36.
-Barnhart, W. D., Hayes, G. P., Samsonov, S. V., Fielding, and E. J. Seidman, L. E. 2014. Breaking the oceanic lithosphere of a subducting slab: The 2013 Khash, Iran earthquake. Geophysical Research Letters, 41,1, 32-36.
-Burg, J.P., Dolati, A., Bernoulli, D. and Smit, J., 2013. Structural style of the Makran Tertiary accretionary complex in SE-Iran. In Lithosphere dynamics and sedimentary basins: The Arabian Plate and analogues, Springer, Berlin, Heidelberg, 239-259.
-Byrne, D.E., Sykes, L.R. and Davis, D.M., 1992. Great thrust earthquakes and aseismic slip along the plate boundary of the Makran subduction zone. Journal of Geophysical Research. 97 (B1), 449-478.
-DeMets, C., Gordon, R.G., Argus, D.F., Stein, S., 1990. Current plate motions. Geophysical Jounal International. 101, 425-478.
-Dimri, V. P., Vedanti, N. and Chattopadhyay, S. 2005. Fractal analysis of aftershock sequence of the Bhuj earthquake: A wavelet-based approach. Current Science. 88,10, 1617-1620.
-Farhoudi, G, and Karig, D.E., 1977. Makran of Iran and Pakistan as an active arc system. Geology 5,11, 664–668
-Gentili, S. and Bressan, G. 2008. The partitioning of radiated energy and the largest aftershock of seismic sequences occurred in the northeastern Italy and western Slovenia. Journal of Seismology, 12,3, 343-354.
-Grando, G. and McClay, K. 2007. Morphotectonics domains and structural styles in the Makran accretionary prism, offshore Iran. Sedimentary Geology, 196,1-4, 157-179.
-Grassberger, P., and Procaccia, I., 1983. Characterization of strange attractors. Physical review letters, 50,5, 346.
-Guo, Z. and Ogata, Y. 1997. Statistical relations between the parameters of aftershocks in time, space, and magnitude. Journal of Geophysical Research: Solid Earth, 102(B2), 2857-2873.
-Gutenberg, B. and Richter, C., 1954. Seismicity of the Earth and Associated Phenomena, 2. Princeton University Press. 295.
-Hamdache, M., Peláez, J. A. and Talbi, A., 2013. Analysis of aftershock sequences in South and Southeastern Spain. Physics and Chemistry of the Earth, Parts A/B/C, 63, 55-76.
-Hirata, T.,1989. A correlation between the b value and the fractal dimension of earthquakes. Journal of Geophysical Research: Solid Earth, 94(B6), 7507-7514.
-Hu, C., Cai, Y., Liu, M., and Wang, Z. 2013. Aftershocks due to property variations in the fault zone: A mechanical model. Tectonophysics, 588, 179-188.
-Huang, J. and Turcotte, D. L.,1988. Fractal distributions of stress and strength and variations of b-value. Earth and Planetary Science Letters, 91(1-2), 223-230.
-Isacks, B. L. and Barazangi, M., 1977. Geometry of Benioff zones: Lateral segmentation and downwards bending of the subducted lithosphere. Island Arcs, Deep Sea Trenches and Back‐Arc Basins, 1, 99-114.
-Kagan, Y. Y. and Knopoff, L., 1980. Spatial distribution of earthquakes: the two-point correlation function. Geophysical Journal International, 62,2, 303-320.
-Kearey, P., Klepeis, K.A. and Vine, F.J., 2009. Global Tectonics. Third Edition. Wiley-Blackwell. 482.
-Khattri, K.N., 1995. Fractal description of seismicity of India and inferences regarding earthquake hazard. Current Science. 69, 361–366.
-Kisslinger, C., 1996. Aftershock and Fault Zone Properties. Advances in Geophysics, 38, 1-36.
-Kisslinger, C. and Jones, L. M., 1991. Properties of aftershock sequences in southern California. Journal of Geophysical Research: Solid Earth, 96(B7), 11947-11958.
-Kundu, B., Nankali, H., Malik, P., Yadav, R. K. and Gahalaut, V. K. 2014. Coseismic Offsets due to Intermediate Depth 16 April 2013 Southeast Iran Earthquake (M w 7.8). Bulletin of the Seismological Society of America, 104,3, 1562-1566.
-Legrand, D., 2002. Fractal dimensions of small, intermediate, and large earthquakes. Bulletin of the Seismological Society of America 92, 3318–3320.
-Öncel , A. O. and Wilson, T., 2002. Space-Time Correlations of Seismotectonic Parameters: Examples from Japan and from Turkey Preceding the Izmit Earthquake. Bulletin of the Seismological Society of America. 92, 339–349
-Öncel, A. O., Main, I., Alptekin, Ö. and Cowie, P., 1996. Temporal variations in the fractal properties of seismicity in the north Anatolian fault zone between 31 E and 41 E. Pure and Applied Geophysics, 147,1, 147-159.
-Penney, C., Tavakoli, F., Saadat, A., Nankali, H.R., Sedighi, M., Khorrami, F., Sobouti, F., Rafi, Z., Copley, A., Jackson, J. and Priestley, K., 2017. Megathrust and accretionary wedge properties and behaviour in the Makran subduction zone. Geophysical Journal International, 209,3,1800-1830.
-Roy S., Ghosh U., Hazra S. and Kayal J.R., 2011. Fractal dimension and bvalue mapping in the Andaman-Sumatra subduction zone-. Natural Hazards. 57, 27 37.
-Scholz, C. H., 2015. On the stress dependence of the earthquake b value. Geophysical Research Letters, 42,5, 1399-1402.
-Schorlemmer, D., S. Wiemer, and M. Wyss 2005. Variations in earthquake‐size distribution across different stress regimes, Nature, 437, 539–542, doi:10.1038/nature04094.
-Shcherbakov, R. and Turcotte, D. L. 2004. A damage mechanics model for aftershocks. Pure and Applied Geophysics, 161(11-12), 2379-2391.
-Shcherbakov, R., Turcotte, D. L. and Rundle, J. B. 2005. Aftershock statistics. Pure Appl. Geophys. 162, 1051–1076.
-Shcherbakov, R., Turcotte, D.L. and Rundle, J.B., 2015. Complexity and Earthquakes. Treatise on Geophysics, second ed.http://dx.doi.org/10.1016/B978-0-444-53802-4. 00094-4.
-Singh, C., Bhattacharya, P.M. and Chadha, R.K., 2008. Seismicity in the Koyna-Warna Reservoir Site in Western India: fractal and b-value mapping. Bulletin of Seismological Society of America. 98, 476–482. doi.org/10.1785/0120070165.
-Singh,C., Singh, A. and Chadha, R.K., 2009. Fractal and b-value mapping in Eastern Himalaya and Southern Tibet. Bulletin of Seismological Society of America. 99, 3529–3533. doi. org/10.1785/0120090041.
-Tajima, F. and Kanamori, H. 1985. Global survey of aftershock area expansion patterns. Physics of the Earth and planetary interiors, 40,2, 77-134.
Tosi, P., 1998. Seismogenic structure behaviour revealed by spatial clustering of seismicity in the Umbria-Marche Region (Central Italy). Annals of Geophysics, 41,2. University Press, Princeton, NJ, USA.
-Utsu, T., 2002. Statistical features of seismicity. International Geophysics Series, 81(A), 719-732.
-Vernant, P., Nilforoushan, F., Hatzfeld, D., Abbassi, M. R., Vigny, C., Masson, F. ... and Tavakoli, F. 2004. Present-day crustal deformation and plate kinematics in the Middle East constrained by GPS measurements in Iran and northern Oman. Geophysical Journal International, 157,1, 381-398.
-Yadav, R. B. S., Gahalaut, V. K., Chopra, S. and Shan, B., 2012. Tectonic implications and seismicity triggering during the 2008 Baluchistan, Pakistan earthquake sequence. Journal of Asian Earth Sciences, 45, 167-178.
-Yadav, R.B.S., Papadimitriou, E., Karakostas, V.G., Shanker, D., Rastogi, B.K., Chopra, S., Singh, A.P. and Kumar, K., 2011. The 2007 Talala, Saurashtra, western India earthquake sequence: tectonic implications and seismicity triggering. J. Asian Earth Sci. 40, 303–314
-Yamashita, T. and Knopoff, L.,1987. Models of aftershock occurrence. Geophysical Journal International, 91,1, 13-26.
-Zarifi Z., 2006. Unusual subduction zones: case studies in Colombia and Iran, Unpublished Ph.D. Thesis., University of Bergen, Norway, 75.