Probabilistic seismic hazard map analysis for Aceh Tenggara district and microzonation for Kutacane city
Probabilistic seismic hazard map analysis for Aceh Tenggara district and microzonation for Kutacane city
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亚齐登加拉地区概率地震危险图分析和库塔坎市微分区
DOI：
10.1088/1755-1315/630/1/012001
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Asrurifak
中科院分区：
文献类型：
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作者：
I. Irwandi;U. Muksin;Asrillah;A. Simanjuntak;Asrurifak
亚齐东南部地区，特别是库塔卡内，与主要的苏门答腊岛大断层(GSF)系统一起，特别是根据印度尼西亚2017年地震危险图，位于Tripa段。因此，需要根据最新的地震构造信息和最新的活动断裂调查来更新地震危险性图。本文讨论了亚齐腾加拉区最新的地震危险性图。在地震危险性计算中，输入震源定义，包括断层特征、俯冲带和地震活动背景。印尼2017年官方地震危险图使用地面运动预测方程(GMPE)来计算强地面震动的危险曲线。选取50年超过2%和10%的概率计算基岩上的PGA(峰值地面加速度)图。另一方面，库塔康位于全新世一个较年轻的冲积盆地上，因此在微带计算(局部尺度)中考虑了场地沉积物的放大效应。利用地貌坡度估算Vs30分布图。场地放大系数是根据基岩上的PGA值和每个场地位置上的Vs30值来计算的。概率地震危险性分析(PSHA)被用于制作地震危险性图，因为印度尼西亚的许多科学家和工程师也在使用，尽管对于关键基础设施，建议应用新确定性地震危险性分析(NDSHA)。最新更新的地震危险性图可作为基础设施建设的参考，以降低灾害风险。
The Aceh Tenggara (Southeast Aceh) District, especially Kutacane, is located along with the main GSF (Great Sumatra Fault) system and the Tripa segment in particular based on seismic hazard map of Indonesia 2017. Therefore, the seismic hazard map needs to be updated based on the recent seismotectonic information and the latest active fault investigations. This paper discusses the updated seismic hazard map for the Aceh Tenggara district. In seismic hazard calculation, input source definition including fault characteristics, subduction zone, and seismicity background. Ground Motion Prediction Equation (GMPE) is used by the Indonesian official seismic hazard map 2017 to compute the hazard curve of strong ground shaking. Probability exceeding 2% and 10% for 50 years is chosen to calculate PGA (Peak Ground Acceleration) map on bedrock. On the other hand, Kutacane is located on a younger alluvium basin in the Holocene epoch thus site sediment amplification effect is taken into account in the microzonation calculations (local scale). The geomorphological slope is used to estimate the Vs30 distribution map. The site amplification is calculated based on PGA value on bedrock and Vs30 value on each site location. The Probabilistic Seismic Hazard Analysis (PSHA) is applied to produce seismic hazard maps as also used since many scientists and engineers in Indonesia although for critical infrastructure Neo-Deterministic Seismic Hazard Analysis (NDSHA) is suggested to be applied. The newly updated seismic hazard map can be used for the reference of infrastructure development in order to reduce the risk of disaster.
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