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Probabilistic and deterministic estimates of near-field tsunami hazards in northeast Oman
Geoscience Letters ( IF 4.0 ) Pub Date : 2018-12-18 , DOI: 10.1186/s40562-018-0129-4
I. El-Hussain , R. Omira , Z. Al-Habsi , M. A. Baptista , A. Deif , A. M. E. Mohamed

Tsunamis generated along the Makran subduction zone (MSZ) threaten the Sur coast of Oman, according to deterministic and probabilistic analyses presented here. A validated shallow water numerical code simulates the source-to-coast propagation and quantifies the coastal hazard in terms of maximum water level, flow depth, and inundation distance. The worst-case source assumed for the eastern MSZ is a thrust earthquake of Mw 8.8. This deterministic scenario produces simulated wave heights reaching 2.5 m on the Sur coast leading to limited coastal inundation extent. Because Oman adjoins the western MSZ, the probabilistic analysis includes the effect of this segment also. The probabilistic analysis shows onshore inundations exceeding 0.4 km northwest of Sur where flow depths are likely to exceed 1 m in 500 years. Probability analysis shows lesser inundation areas with probability of exceeding 1 m flow depth up to 80% in 500-year exposure time. Teletsunamis are excluded from these analyses because far-field waves of the 2004 Indian Ocean tsunami did not impact the Sur coast. Also excluded for simplicity are tsunamis generated by submarine slides within or near MSZ rupture areas. The results of this research provide essential information for coastal planning, engineering and management in terms of tsunami hazard and an essential step toward tsunami risk reductions in the northwest Indian Ocean.

中文翻译:

阿曼东北部近场海啸危害的概率和确定性估计

根据此处提供的确定性和概率分析,沿马兰俯冲带(MSZ)产生的海啸威胁着阿曼苏尔海岸。经过验证的浅水数字代码可以模拟源头到海岸的传播,并根据最大水位,水深和淹没距离来量化沿海灾害。东部MSZ假定的最坏情况源是8.8兆瓦的逆冲地震。这种确定性方案在苏尔海岸产生的模拟波高达到2.5 m,导致有限的沿海淹没程度。由于阿曼毗邻西部的MSZ,因此概率分析也包括了该段的影响。概率分析显示,在Sur西北部超过0.4 km的陆上淹没区,其流深在500年内可能超过1 m。概率分析显示,淹没区域较小,在500年的暴露时间内,超过1 m的水深的可能性高达80%。这些分析排除了海啸,因为2004年印度洋海啸的远场波并未影响苏尔海岸。为简单起见,MSZ破裂区域内或附近的海底滑动产生的海啸也被排除在外。这项研究的结果为海啸危害方面的沿海规划,工程和管理提供了重要信息,也是朝西北印度洋减少海啸风险迈出的重要一步。为简单起见,MSZ破裂区域内或附近的海底滑动产生的海啸也被排除在外。这项研究的结果为海啸危害方面的沿海规划,工程和管理提供了重要信息,也是朝西北印度洋减少海啸风险迈出的重要一步。为简单起见,MSZ破裂区域内或附近的海底滑动产生的海啸也被排除在外。这项研究的结果为海啸危害方面的沿海规划,工程和管理提供了重要信息,也是朝西北印度洋减少海啸风险迈出的重要一步。
更新日期:2018-12-18
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