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A hybrid deterministic and stochastic approach for tsunami hazard assessment in Iquique, Chile

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  • Juan González

    (Centro de Investigación para la Gestión Integrada del Riesgo de Desastres CONICYT FONDAP 1511007 (CIGIDEN)
    Universidad Católica del Norte)

  • Gabriel González

    (Centro de Investigación para la Gestión Integrada del Riesgo de Desastres CONICYT FONDAP 1511007 (CIGIDEN)
    Universidad Católica del Norte)

  • Rafael Aránguiz

    (Centro de Investigación para la Gestión Integrada del Riesgo de Desastres CONICYT FONDAP 1511007 (CIGIDEN)
    Universidad Católica de la Santísima Concepción)

  • Diego Melgar

    (University of Oregon)

  • Natalia Zamora

    (Centro de Investigación para la Gestión Integrada del Riesgo de Desastres CONICYT FONDAP 1511007 (CIGIDEN)
    Universidad Técnica Federico Santa María
    The Seismic Cycle Along Subduction Zones)

  • Mahesh N. Shrivastava

    (Centro de Investigación para la Gestión Integrada del Riesgo de Desastres CONICYT FONDAP 1511007 (CIGIDEN)
    Universidad Católica del Norte)

  • Ranjit Das

    (Centro de Investigación para la Gestión Integrada del Riesgo de Desastres CONICYT FONDAP 1511007 (CIGIDEN)
    Universidad Católica del Norte)

  • Patricio A. Catalán

    (Centro de Investigación para la Gestión Integrada del Riesgo de Desastres CONICYT FONDAP 1511007 (CIGIDEN)
    Universidad Técnica Federico Santa María
    Universidad Técnica Federico Santa María)

  • Rodrigo Cienfuegos

    (Centro de Investigación para la Gestión Integrada del Riesgo de Desastres CONICYT FONDAP 1511007 (CIGIDEN)
    Pontificia Universidad Católica de Chile)

Abstract

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.

Suggested Citation

  • Juan González & Gabriel González & Rafael Aránguiz & Diego Melgar & Natalia Zamora & Mahesh N. Shrivastava & Ranjit Das & Patricio A. Catalán & Rodrigo Cienfuegos, 2020. "A hybrid deterministic and stochastic approach for tsunami hazard assessment in Iquique, Chile," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 100(1), pages 231-254, January.
  • Handle: RePEc:spr:nathaz:v:100:y:2020:i:1:d:10.1007_s11069-019-03809-8
    DOI: 10.1007/s11069-019-03809-8
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    References listed on IDEAS

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    1. Gavin P. Hayes & Matthew W. Herman & William D. Barnhart & Kevin P. Furlong & Sebástian Riquelme & Harley M. Benz & Eric Bergman & Sergio Barrientos & Paul S. Earle & Sergey Samsonov, 2014. "Continuing megathrust earthquake potential in Chile after the 2014 Iquique earthquake," Nature, Nature, vol. 512(7514), pages 295-298, August.
    2. Bernd Schurr & Günter Asch & Sebastian Hainzl & Jonathan Bedford & Andreas Hoechner & Mauro Palo & Rongjiang Wang & Marcos Moreno & Mitja Bartsch & Yong Zhang & Onno Oncken & Frederik Tilmann & Torste, 2014. "Gradual unlocking of plate boundary controlled initiation of the 2014 Iquique earthquake," Nature, Nature, vol. 512(7514), pages 299-302, August.
    3. Paula Aguirre & Jorge Vásquez & Juan Carlos de la Llera & Juan González & Gabriel González, 2018. "Earthquake damage assessment for deterministic scenarios in Iquique, Chile," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 92(3), pages 1433-1461, July.
    4. J. Ruiz & M. Fuentes & S. Riquelme & J. Campos & A. Cisternas, 2015. "Numerical simulation of tsunami runup in northern Chile based on non-uniform k −2 slip distributions," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 79(2), pages 1177-1198, November.
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