Probabilistic seismic hazard assessments for Myanmar and its metropolitan areas

IF 4 3区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Huan-Bin Yang, Yuan-Kai Chang, Wei Liu, Guan-Yi Sung, Jia-Cian Gao, Myo Thant, Phyo Maung Maung, Chung-Han Chan
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Abstract

Abstract Although Myanmar is an earthquake-prone country, there has not been proposed an official national seismic hazard map. Thus, this study conducted a probabilistic seismic hazard assessment for Myanmar and some of its metropolitan areas. Performing this assessment required a set of databases that incorporates both earthquake catalogs and fault parameters. We obtained seismic parameters from the International Seismological Centre, and the fault database includes fault parameters from paper reviews and the database. Based on seismic activities, we considered three categories of seismogenic sources—active fault source, shallow area source, and subduction zone source. We evaluated seismic activity of each source based on the earthquake catalogs and fault parameters. Evaluating the ground-shaking behaviors for Myanmar requires evaluation of ground-shaking attenuation; therefore, we validated existing ground motion prediction equations (GMPEs) by comparing instrumental observations and felt intensities for recent earthquakes. We then incorporated the best fitting GMPEs into our seismic hazard assessments. By incorporating the V s 30 (the average shear velocity down to 30 m depth) map from an analysis of topographic slope, we utilized site effect and assessed national probabilistic seismic hazards for Myanmar. The assessment shows highest seismic hazard levels near those faults with high slip rates, including the Sagaing Fault and along the Western Coast of Myanmar. We also assessed seismic hazard for some metropolitan cities, including Bagan, Bago, Mandalay, Sagaing, Taungoo and Yangon, in the forms of hazard curves and disaggregation by implementing detailed V s 30 maps from micro-tremor surveys. The city-scale assessments show higher hazards for sites close to an active fault or/and with a low V s 30 , demonstrating the importance of investigating site conditions. The outcomes of this study will be beneficial to urban planning on a city scale and building code legislation on a national scale.
缅甸及其大都市区地震危险性概率评估
虽然缅甸是一个地震多发国家,但尚未提出官方的全国地震危险度图。因此,本研究对缅甸及其一些大都市地区进行了概率地震灾害评估。进行这项评估需要一组数据库,其中包括地震目录和断层参数。我们从国际地震中心获得地震参数,断层数据库包括论文综述和数据库中的断层参数。根据地震活动性,将地震源分为活动断层源、浅部震源和俯冲带震源三大类。我们根据地震目录和断层参数对每个震源的地震活动性进行了评估。评估缅甸地震动行为需要评估地震动衰减;因此,我们通过比较最近地震的仪器观测和感觉强度来验证现有的地面运动预测方程(GMPEs)。然后,我们将最合适的GMPEs纳入我们的地震危险性评估。通过结合地形坡度分析得出的vs30(深度30米以下的平均剪切速度)图,我们利用场地效应并评估了缅甸的全国概率地震灾害。评估显示,在高滑动率的断层附近,地震危险性最高,包括实皆断层和缅甸西海岸。我们还评估了一些大城市的地震危险性,包括蒲甘、勃固、曼德勒、实皆、东吁和仰光,通过实施详细的vs 30微震调查地图,以危险曲线和分解的形式。城市规模的评估显示,靠近活动断层或/和低vs30的站点的危险性更高,这表明调查站点条件的重要性。本文的研究成果对城市尺度上的城市规划和国家尺度上的建筑规范立法具有借鉴意义。
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来源期刊
Geoscience Letters
Geoscience Letters Earth and Planetary Sciences-General Earth and Planetary Sciences
CiteScore
4.90
自引率
2.50%
发文量
42
审稿时长
25 weeks
期刊介绍: Geoscience Letters is the official journal of the Asia Oceania Geosciences Society, and a fully open access journal published under the SpringerOpen brand. The journal publishes original, innovative and timely research letter articles and concise reviews on studies of the Earth and its environment, the planetary and space sciences. Contributions reflect the eight scientific sections of the AOGS: Atmospheric Sciences, Biogeosciences, Hydrological Sciences, Interdisciplinary Geosciences, Ocean Sciences, Planetary Sciences, Solar and Terrestrial Sciences, and Solid Earth Sciences. Geoscience Letters focuses on cutting-edge fundamental and applied research in the broad field of the geosciences, including the applications of geoscience research to societal problems. This journal is Open Access, providing rapid electronic publication of high-quality, peer-reviewed scientific contributions.
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