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地震

地震 ›› 2003, Vol. 23 ›› Issue (2): 59-69.

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震级加权四指标Blade算法及在地震带识别中的应用*

秦承志1, 裴韬1, 周成虎1, 李全林2, 韩志军1, 汪闽1, 蔡强1   

  1. 1.中国科学院地理科学与资源研究所资源与环境信息系统国家重点实验室,北京 1001011;
    2.中国地震局地球物理研究所,北京 100081
  • 收稿日期:2002-04-01 修回日期:2002-06-24 出版日期:2003-04-30 发布日期:2021-12-21
  • 作者简介:秦承志(1977-）,男,山东蒙阴人,2000年在读博士生,主要从事空间数据挖掘等研究．
  • 基金资助:
    中国科学院知识创新项目(CXl OG-D00-06, KZCXl-Y-02)

The Ms-weighted 4- index bladeal gorithm and its application for identifying the seismicbelts in the Great North China

QIN Cheng- zhi1, PEI Tao1, ZHOU Cheng -hu1, LI Quan- lin2, HAN Zhi-jun1, WANG Min1, CAI Qiang1   

  1. 1. State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101;
    2. Institute of Geophysics, CSB, Beijing 100081, China
  • Received:2002-04-01 Revised:2002-06-24 Online:2003-04-30 Published:2021-12-21

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摘要： Blade算法的产生是根据地震点的分布寻找地震断层、其优势在于能从较稀疏的点分布中找出线型条带模式,但不足的是完全不考虑地震的震级属性。针对Blade算法的几个不足之处逐步改进,提出了震级加权四指标Blade算法。算法主要的改进体现在： @引入以震级为变量的权重函数,体现了高震级地震的控制作用,通过模拟与实例比较了三种权重函数的效果;@改进原方法中所挑出的Blade中心必须有地震点,引入四指标评价体系代替原方法的二指标评价体系,同时还根据指标值将挑选出的线型条带修正到更准确的位置。将原算法与改进算法应用于华北地区4级以上的地震数据集以搜寻地震带,结果表明,震级加权四指标Blad e算法较Blade算法有显著改进,取得了较好的应用效果。

关键词: Blade算法, 震级加权四指标Blade算法, 地震带, 华北地区

Abstract: The aim of the Blade algorithm is to search the seismic fault based on the distribu-tion of earthquakes. It can find stripe pattern from sparse epicenter distribution. But the com-plete ignorance of the most important attribute of earthquakes, and the seismic moment is itsobvious shortcoming. This paper improves the Blade algorithm step by step and develops theMs-weighted 4 index Blade algorithm. The main improvements of the Ms- weighted 4-indexBlade algorithm include:(1) The Ms-weighted function is introduced for showing thatstronger earthquakes have more effects on index. We compare the effects of three Ms- weight-ed functions through simulation and application.(2) The blades selected out by the Blade algo-rithm must have an earthquake as the center. This is disadvantage of accurate location of theblade results. The 4-index evaluation is instead of the 2-substituting index in the Blade algo-rithm so that the selected -out blades can be amended for more accurate position by the evalua-tion index and the evaluation is more efficient. The Blade algorit hm and the improved algo-rithms are applied to find the seismic belts based on the earthquakes(Ms>4. 0) in the NorthChina. The comparison of the results shows that the M s-weighted 4. -index Blade algorithm hasmore not able improvement than the Blade algorithm and obtains the satisfactory result.

Key words: Blade algorithm, Ms- weighted 4- index Blade algorithm, Seismic belt, NorthChina region

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