As an important model for explaining the seismic rupture mode,the asperity model plays an important role in studying the stress accumulation of faults and the location of earthquake initiation.Taking Qilian-Haiyuan fa...As an important model for explaining the seismic rupture mode,the asperity model plays an important role in studying the stress accumulation of faults and the location of earthquake initiation.Taking Qilian-Haiyuan fault as an example,this paper combines geodetic method and b-value method to propose a multi-source observation data fusion detection method that accurately determines the asperity boundary named dual threshold search method.The method is based on the criterion that the b-value asperity boundary should be most consistent with the slip deficit rate asperity boundary.Then the optimal threshold combination of slip deficit rate and b-value is obtained through threshold search,which can be used to determine the boundary of the asperity.Based on this method,the study finds that there are four potential asperities on the Qilian-Haiyuan fault:two asperities(A1 and A2)are on the Tuolaishan segment and the other two asperities(B and C)are on Lenglongling segment and Jinqianghe segment,respectively.Among them,the lengths of asperities A1 and A2 on Tuolaishan segment are 17.0 km and 64.8 km,respectively.And the lower boundaries are 5.5 km and 15.5 km,respectively;The length of asperity B on Lenglongling segment is 70.7 km,and the lower boundary is 10.2 km.The length of asperity C on Jinqianghe segment is 42.3 km,and the lower boundary is 8.3 km.展开更多
针对使用传统Canny算法进行弓网燃弧检测导致的检测率低的问题,文章以地铁燃弧图像为试验目标,提出了基于改进Canny算法的弓网燃弧检测技术。针对传统Canny算法中高斯滤波导致图片模糊的问题,提出了双边均值迁移滤波(Bilateral Mean Shi...针对使用传统Canny算法进行弓网燃弧检测导致的检测率低的问题,文章以地铁燃弧图像为试验目标,提出了基于改进Canny算法的弓网燃弧检测技术。针对传统Canny算法中高斯滤波导致图片模糊的问题,提出了双边均值迁移滤波(Bilateral Mean Shift Filtering,BMSF)进行滤波处理取代传统的高斯滤波;针对手动输入阈值导致算法适应性差的问题,引入了Otsu算法改进传统的双阈值算法;针对部分燃弧过小而引起的漏检现象,将处理后的二值图像进行膨胀操作,增强燃弧的边界信息。将改进算法与传统算法进行仿真试验评估。结果表明在普通环境与强光环境下,准确率都有一定程度的提升,为基于图像处理的燃弧检测方面的研究提供了新思路。展开更多
基金This work is supported by the National Key Research and Development Plan of China under Grants No.2018YFC1503604the National Natural Science Foundation of China under Grants No.41721003,No.42074007the Key Laboratory of Geospace Environment and Geodesy,Ministry of Education,Wuhan University,No.19-01-08。
文摘As an important model for explaining the seismic rupture mode,the asperity model plays an important role in studying the stress accumulation of faults and the location of earthquake initiation.Taking Qilian-Haiyuan fault as an example,this paper combines geodetic method and b-value method to propose a multi-source observation data fusion detection method that accurately determines the asperity boundary named dual threshold search method.The method is based on the criterion that the b-value asperity boundary should be most consistent with the slip deficit rate asperity boundary.Then the optimal threshold combination of slip deficit rate and b-value is obtained through threshold search,which can be used to determine the boundary of the asperity.Based on this method,the study finds that there are four potential asperities on the Qilian-Haiyuan fault:two asperities(A1 and A2)are on the Tuolaishan segment and the other two asperities(B and C)are on Lenglongling segment and Jinqianghe segment,respectively.Among them,the lengths of asperities A1 and A2 on Tuolaishan segment are 17.0 km and 64.8 km,respectively.And the lower boundaries are 5.5 km and 15.5 km,respectively;The length of asperity B on Lenglongling segment is 70.7 km,and the lower boundary is 10.2 km.The length of asperity C on Jinqianghe segment is 42.3 km,and the lower boundary is 8.3 km.
文摘针对使用传统Canny算法进行弓网燃弧检测导致的检测率低的问题,文章以地铁燃弧图像为试验目标,提出了基于改进Canny算法的弓网燃弧检测技术。针对传统Canny算法中高斯滤波导致图片模糊的问题,提出了双边均值迁移滤波(Bilateral Mean Shift Filtering,BMSF)进行滤波处理取代传统的高斯滤波;针对手动输入阈值导致算法适应性差的问题,引入了Otsu算法改进传统的双阈值算法;针对部分燃弧过小而引起的漏检现象,将处理后的二值图像进行膨胀操作,增强燃弧的边界信息。将改进算法与传统算法进行仿真试验评估。结果表明在普通环境与强光环境下,准确率都有一定程度的提升,为基于图像处理的燃弧检测方面的研究提供了新思路。
