气候变化领域集成服务门户(CCPortal): A hybrid deterministic and stochastic approach for tsunami hazard assessment in Iquique, Chile

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DOI	10.1007/s11069-019-03809-8
	A hybrid deterministic and stochastic approach for tsunami hazard assessment in Iquique, Chile
	González J.; González G.; Aránguiz R.; Melgar D.; Zamora N.; Shrivastava M.N.; Das R.; Catalán P.A.; Cienfuegos R.
发表日期	2020
ISSN	0921030X
起始页码	231
结束页码	254
卷号	100 期号:1
英文摘要	The southern Peru and northern Chile coastal region is an active subduction zone that contains one of the most significant seismic gaps in the eastern Pacific basin (~ 17°S–~ 24°S). Although the gap was partially filled by the 2014 Mw 8.1 Iquique earthquake, there is still a high seismogenic potential to release a Mw ~ 9 earthquake in the near future; therefore, all the near-field coastal cities in the region face a latent tsunami threat. In this article, we propose a hybrid deterministic–stochastic multi-scenario approach to assess the current tsunami hazard level in the city of Iquique, an important commercial and industrial center of northern Chile that is home to 184,000 inhabitants. In our approach, we defined 400 stochastic, 10 deterministic and 10 homogeneous tsunamigenic earthquake scenarios, covering the entire area of the seismic gap. Based on the regional distribution of gravity anomalies and published interseismic coupling distributions, we interpreted the occurrence of four major asperities in the subduction interface of the seismic gap. The asperity pattern was used to construct a group of deterministic slip-deficit earthquake sources with seismic magnitudes ranging between Mw 8.4 and Mw 8.9. Additionally, we constructed 10 homogeneous slip scenarios to generate an inundation baseline for the tsunami hazard. Subsequently, following a stochastic scheme, we implemented a Karhunen–Loève expansion to generate 400 stochastic earthquake scenarios within the same magnitude range as the deterministic slip-deficit sources. All sources were used as earthquake scenarios to simulate the tsunami propagation and inundation by means of a non-hydrostatic model (Neowave 2D) with a classical nesting scheme for the city of Iquique. We obtained high-resolution data for flow depth, coastal surface currents and sea level elevation. The results suggest that the peak slip location and shelf resonance play an important role in the calculated coastal flow depths. The analysis of the entire set of simulated stochastic earthquake scenarios indicates that the worst-case scenario for Iquique is a Mw 8.9 earthquake. This scenario presented a tsunami arrival time of ~ 12 min, which is critical for the evacuation process. In addition, the maximum wave height and tsunami flow depth were found to be ~ 10 m and ~ 24 m, respectively. The observed coastal resonance processes exhibit at least three destructive tsunami wave trains. Based on historical and instrumental catalog statistics, the recurrence time of the credible worst-case earthquake scenario for Iquique (Mw 8.9) is 395 years, with a probability of occurrence of ~ 11.86% in the next 50 years. © 2019, Springer Nature B.V.
关键词	Earthquake scenarios Northern Chile Southern Peru Tsunami hazard assessment
英文关键词	arrival time; earthquake event; earthquake magnitude; gravity anomaly; hazard assessment; probability; subduction; tsunami; Chile; Iquique; Pacific Ocean; Pacific Ocean (East); Peru; Tarapaca
语种	英语
来源期刊	Natural Hazards
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/205708
作者单位	Centro de Investigación para la Gestión Integrada del Riesgo de Desastres CONICYT FONDAP 1511007 (CIGIDEN), Santiago, Chile; Departamento de Ciencias Geológicas, Universidad Católica del Norte, Antofagasta, Chile; Departamento de Ingeniería Civil, Universidad Católica de la Santísima Concepción, Concepción, Chile; Department of Earth Sciences, University of Oregon, Eugene, OR, United States; Departamento de Obras Civiles, Universidad Técnica Federico Santa María, Valparaiso, Chile; Centro Científico Tecnológico de Valparaíso (CCTVal), Universidad Técnica Federico Santa María, Valparaiso, Chile; Departamento de Ingeniería Hidráulica y Ambiental, Pontificia Universidad Católica de Chile, Santiago, Chile; CYCLO Millennium Nucleus, The Seismic Cycle Along Subduction Zones, Valdivia, Chile
推荐引用方式 GB/T 7714	González J.,González G.,Aránguiz R.,et al. A hybrid deterministic and stochastic approach for tsunami hazard assessment in Iquique, Chile[J],2020,100(1).
APA	González J..,González G..,Aránguiz R..,Melgar D..,Zamora N..,...&Cienfuegos R..(2020).A hybrid deterministic and stochastic approach for tsunami hazard assessment in Iquique, Chile.Natural Hazards,100(1).
MLA	González J.,et al."A hybrid deterministic and stochastic approach for tsunami hazard assessment in Iquique, Chile".Natural Hazards 100.1(2020).