Application and evaluation of the 16 September 2015 Illapel, Chile Mw 8.3 earthquake finite fault rupture model from numerical simulation
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摘要: 2015年9月16日22时54分(当地时间)智利中部近岸发生Mw8.3级地震,震源深度25 km。同时,强震的破裂区长200 km,宽100 km,随之产生了中等强度的越洋海啸。海啸影响了智利沿岸近700 km的区域,局部地区监测到近5 m的海啸波幅和超过13 m的海啸爬坡高度。太平洋区域的40多个海啸浮标及200多个近岸潮位观测站详细记录了此次海啸的越洋传播过程,为详细研究此次海啸近场及远场传播及演化规律提供了珍贵的数据。本文选择有限断层模型和自适应网格海啸数值模型建立了既可以兼顾越洋海啸的计算效率又可以实现近场海啸精细化模拟的高分辨率海啸模型。模拟对比分析了海啸的越洋传播特征,结果表明采用所建立的模型可以较好地再现远场及近场海啸特征,特别是对近场海啸的模拟结果非常理想。表明有限断层可以较好地约束近场、特别是局部区域的破裂特征,可为海啸预警提供更加精确的震源信息,结合高分辨率的海啸数值预报模式实现海啸传播特征的精细化预报。本文结合观测数据与数值模拟结果初步分析了海啸波的频散特征及其对模型结果的影响。同时对观测中典型的海啸波特征进行的简要的总结。谱分析结果表明海啸波的能量主要分布在10~50 min周期域内。这些波特征提取是现行海啸预警信息中未涉及,但又十分重要的预警参数。进一步对这些波动特征的详细研究将为海啸预警信息及预警产品的完善提供技术支撑。Abstract: On September 16, 2015, at 19:54 (local time) a magnitude Mw 8.3 earthquake took place off the coast of central Chile, focal depth of 25 km. Meanwhile, the earthquake with rupture zone 200 km long and 100 km wide triggered moderate intensity teletsunami. The tsunami impacted approximately 700 km of the coast of Chile, some areas tsunami reached amplitudes near 5 m and tsunami run-up exceeded 13 m. Tsunami waves were subsequently recorded by more than 40 Deep-ocean Assessment and Reporting of Tsunami (DART) buoys in the Pacific Ocean and more than 200 tide gauges throughout the Pacific Ocean, a rich supply of data which study the tsunami propagation scenarios in near-filed and deep-water. This paper used the finite fault models and adaptive refinement algorithms to build a well computational efficiency and high resolution numerical tsunami model. We analyzed the teletsunami propagation characteristics. The results show that by using the established model can well reproduce the far-field and near-field tsunami process, especially on the near-field the simulation results fit well with the observational data. It indicates that the finite fault model can better depict the near-field, especially the rupture characteristics and provide more accurate source information. The fine prediction of tsunami propagation characteristics can be achieved by the finite fault model and high resolution numerical tsunami model. In this paper, using the observation data and simulation results, analyzed the frequency dispersion of the tsunami wave and its influence on the model. Meanwhile, carried out a brief summary of the typical characteristics of the tsunami wave. The wavelet analysis show that the tsunami energy is concentrated in the period band of around 10-50 min. These wave characteristics are not involved in the current tsunami warning information, but they are very important parameters. Further research on these characteristics will provide technical support for the improvement of tsunami warning information and warning products.
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Synolakis C E, Okal E, Bernard E N. The megatsunami of December 26, 2004[J]. Bridge, 2005, 35: 26-35. Geist E L, Titov V V, Synolakis C E. Tsunami:Wave of change[J]. Scientific American, 2006, 294(1): 56-65. Titov V V. Tsunami Forecasting, in the Sea[M]. Cambridge: Harvard University Press, 2009: 371-400. Tang L J, Titov V V, Chamberlin C D. Development, testing, and applications of site-sepcific tsunami inundation models for real-time forecasting[J]. Journal of Geophysical Research, 2009, 114(C12): 43-47. 王培涛, 于福江, 赵联大, 等. 2011年3月11日日本地震海啸越洋传播及对中国影响的数值分析[J]. 地球物理学报, 2012, 55(9): 3088-3096. Wang Peitao, Yu Fujiang, Zhao Lianda, et al. Numerical analysis of tsunami propagating generated by the Japan Mw 9.0 earthquake on May. 11 in 2011 and its impact on China coasts[J]. Chinese Journal of Geophysics, 2012, 55(9): 3088-3096. Baba T, Hirata K, Kaneda Y. Tsunami magnitude determined from ocean bottom pressure gauge data around Japan[J]. Geophysical Research Letters, 2004, 31(8): 239-261. Takayama H. Statistical relationship between tsunami maximum amplitudes of offshore and coastal stations[J]. Papers in Meteorology Geophysics, 2008, 59: 83-95. Tang L J, Titov V V, Bernard E N, et al. Direct energy estimation of the 2011 japan tsunami using deep-ocean pressure measurements[J]. Journal of Geophysical Research Atmospheres, 2012, 117(C8): 72-82. Wang D L, Becker N C, Walsh D, et al. Real-time forecasting of the April 11,2012 Sumatra tsunami[J]. Geophysical Research Letters, 2012, 39(L19601): 1-6. Wei Y, Titov V V, Newman A V, et al. Near-field hazard assessment of March 11, 2011 Japan Tsunami sources inferred from different methods[J]. Oceans, 2011, 8(5): 1-9. Tsushima H, Kenji H, Hayashi Y, et al. Near-field tsunami forecasting using offshore tsunami data from the 2011 off the Pacific coast of Tohoku Earthquake[J]. Earth Planets Space, 2012, 63: 821-826. Ergin U. Comparison of the seafloor displacement from uniform and non-uniform slip model on tsunami simulation of the 2011 Tohoku-Oki earthquake[J]. Journal of Asian Earth Sciences, 2013, 62: 568-585. Wei Y, Newman A V, Hayes G P, et al. Tsunami forecast by joint inversion of real-time tsunami waveforms and seismic or GPS Data: application to the Tohoku 2011 tsunami[J]. Pure and Applied Geophysics, 2014, 171(12): 3281-3305. 景惠敏, 张怀, 吴忠良, 等. 利用海啸数值模拟结果进行海底地震有限断层模型验证[J]. 地震, 2013, 33(4): 207-213. Jin Huimin, Zhang Huai, Wu Zhongliang, et al. Tsunami constraints on finite fault models:the March 11, 2011 Tohoku earthquake[J]. Earthquake, 2013, 33(4):207-213. Yamazaki Y, Cheung K F, Lay T. Modeling of the 2011 Tohoku near-field tsunami from finite-fault inversion of seismic waves[J]. Bulletin of the Seismological Society of America, 2013, 103(2B): 1444-1455. 王培涛, 于福江, 原野, 等. 海底地震有限断层破裂模型对近场海啸数值预报的影响[J]. 地球物理学报, 2016, 59(3): 1030-1045. Wang Peitao, Yu Fujiang, Yuan Ye, et al. Research on the effects of the finite fault rupture models of submarine earthquakes for numerical forecasting of near-field tsunami[J]. Chinese Journal of Geophysics, 2016, 59(3): 1030-1045. Moreno M, Rosenau M, Oncken O. 2010 Maule earthquake slip correlates with pre-seismic locking of Andean subduction zone[J]. Nature, 2010, 467(7312): 198-202. Barrientos S E, Ward S N. The 1960 Chile earthquake: inversion for slip distribution from surface deformation[J]. Geophysical Journal International, 1990, 103(3): 589-598. Ryo Okuwaki, Yuji Yagi, Aránguiz R, et al. Rupture process during the 2015 Illapel, Chile Earthquake zigzag-along-dip rupture[J]. Pure and Applied Geophysics, 2016, 173(4): 1011-1020. Ye Lingling, Lay T, Kanamori H, et al. Rapidly estimated seismic source parameters for the 16 September 2015 Illapel, Chile Mw 8.3 Earthquake[J]. Pure and Applied Geophysics, 2016, 173(2): 321-332. Bonnefoy P, Romero S. In Chile, earthquake forces one million to evacuate[N]. The New York Times, 2015-09-17. Fritz H M, Petroff C M., Catalán P A. The Chile tsunami of 27 February 2010: Field survey and modeling[J]. Pure and Applied Geophys, 2014, 168(11): 1989-2010. 王培涛, 于福江, 范婷婷, 等. 海啸波传播的线性和非线性特征及近海陆架效应影响的数值研究[J]. 海洋学报, 2014, 36(5): 18-29. Wang Peitao, Yu Fujiang, Fan Tingting, et al. Numerical study on the linear/nonlinear characteristics and the impacts of continental shelf effects of the tsunami waves propagating[J]. Haiyang Xuebao, 2014, 36(5): 18-29. Wang X M, Liu L F. An explicit finite difference model for simulating weakly nonlinear and weakly dispersive waves over slowly varying water depth[J]. Coastal Engineering, 2011, 58(2): 173-183. Titov V V, González F I. Implementation and Testing of the Method of Splitting Tsunami(MOST) Model[M]. Seattle: Pacific Marine environmental Laboratory Press, 1997: 1-11. George D L, LeVeque R J. Finite volume methods and adaptive refinement for global tsunami propagation and local inundation[J]. Science of Tsunami Hazards, 2006, 24(5): 2255-2263. Shi F Y, Kirby J T, Tehranirad B. Tsunami benchmark results for spherical coordinate version of FUNWAVE-TVD (Version 1.1)[R]. Newark: Center for Applied Coastal Research, University of Delaware, 2012. Yamazaki Y, Cheung K F, Kowalik Z. Depth-integrated non-hydrostatic model with grid nesting for tsunami generation,propagation, and run-up[J]. International Jourmal for Numerical Methods in Fluids, 2011, 67(12): 2081-2107. Macinnes B T, Gusman A R, Leveque R J, et al. Comparison of earthquake source models for the 2011 Tohoku-oki event using tsunami simulations and near field observations[J]. Bulletin of the Seismological Society of America, 2013, 103(2B): 1256-1274. Titov V, Rabinovich A B, Mofjeld H O, et al. The global reach of the 26 December 2004 Sumatra tsunami[J]. Science, 2005, 309(5743): 2045-2048. Zheng Jinhai, Xiong Mengjie, Wang Gang. Trapping mechanism of submerged ridge on trans-oceanic tsunami propagtion[J]. China Ocean Engineering, 2016, 30(2): 271-282. Yamazaki Y, Cheung K F. Shelf resonance and impact of near-field generated by 2010 Chile earthquake[J]. Geophysical Research Letters, 2011, 38(12): 564-570.
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