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东北西藏高原b值的空间异质性及其解释

Nan Hu^1,2,3, Peng Han⁴, Rui Wang⁴

¹Key Laboratory of Intraplate Volcanoes and Earthquakes, Ministry of Education, China University of Geosciences (Beijing), Beijing 100083, China.

Entropy (Basel, Switzerland)

|March 28, 2024

概括

由于历史上的地震,东东藏高原的地震风险分析至关重要. 这项研究映射了空间b值,揭示了断层区域的地震危险变化.

科学领域:

地质物理学地质物理学
地震学地震学
构造学构造学构造学构造学

背景情况:

西藏高原东北部 (西藏高原东北部) 是一个有着大地震 (M≥7) 的历史的构造性活跃地区.
准确的地震危险评估对该地区至关重要,b值是关键参数.
在复杂的故障系统中,用于b值计算的传统网格搜索方法可能不准确.

研究的目的:

用自1970年以来的地震数据计算和分析西北藏高原b值的空间分布.
调查空间b值变化与沿主要活跃断层的地震活动之间的关系.
在复杂的构造学环境中提高空间b值计算的准确性.

主要方法:

利用研究区域的1970年至今的地震目录.
采用等级空间时间点过程 (HIST-PPM) 方法进行精确的空间b值计算.
使用Akaike的贝叶斯信息标准 (ABIC) 优化参数与最大化.

主要成果:

在西藏高原东北部的b值中发现了显著的空间异质性.
在该地区的西北部和东南部地区发现了较高的b值.
沿海,中和西林断层区域观察到明显的b值模式,与过去的地震事件相关.

结论:

空间b值分布有效地反映了不同断层区域和个别断层内的地震危险的变化.
低b值地区通常与过去50年经历中度至强烈地震事件的地区相关.
在复杂的构造环境中,HIST-PPM方法提供了更准确的空间b值评估.

关键词:

这就是HIST-PPM.这就是Zmap Zmap.b价值b值是指一个值.断层区域的断层区域是一个断层区域.这是西藏东北部高原.

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