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基于YOLOv5s的重力变化异常特征识别研究

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大地测量与地球动力学 2024年第5期44卷 522-527页

作者：常鲁冀郝洪涛胡敏章防灾科技学院信息工程学院河北省三河市065201 中国地震局地震大地测量重点实验室武汉市430071 湖北省地震局武汉市430071

针对人工判读重力变化异常特征区存在效率低下的问题,提出利用YOLOv5s算法进行重力变化四象限特征区自动化识别的方法,并基于南北地震带实测重力变化资料进行测试验证。结果表明:1)本文构建的图像识别模型可有效识别较为标准的四象限分... 详细信息

针对人工判读重力变化异常特征区存在效率低下的问题,提出利用YOLOv5s算法进行重力变化四象限特征区自动化识别的方法,并基于南北地震带实测重力变化资料进行测试验证。结果表明:1)本文构建的图像识别模型可有效识别较为标准的四象限分布特征区,模型预测结果的精度、召回率、平均精度等指标均处于合理范围;2)模型较为准确地识别出南北地震带2021-09~2022-05时段重力变化图像中的四象限特征区,且特征区内先后发生2022-06芦山6.1级地震和2022-09泸定6.8级地震,表明该方法对于重力异常区域的筛选以及潜在的地震风险研判具有较好的应用潜力;3)模型对于存在明显畸变的非标准四象限特征区的识别能力仍存在一定不足,需要构建数量更多和标注更为合理的数据集,进一步提升模型对四象限特征区识别的普适性。

关键词：重力变化机器学习特征识别地震风险研判

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考虑前车意图的车距控制研究

西北工程技术学报 2024年第3期23卷 260-265页

作者：韩帅帅郝洪涛马侦宁夏大学机械工程学院宁夏银川750021 宁夏智能装备CAE重点实验室宁夏银川750021

在车辆自适应巡航过程中,前车驾驶员的操作意图对跟随车辆具有重要影响,针对车辆自适应巡航时容易受前车加减速影响自身跟车距离的问题,设计了一种考虑前车驾驶意图的安全车距策略。该策略由意图识别层、跟随决策层、运动控制层3部分组... 详细信息

在车辆自适应巡航过程中,前车驾驶员的操作意图对跟随车辆具有重要影响,针对车辆自适应巡航时容易受前车加减速影响自身跟车距离的问题,设计了一种考虑前车驾驶意图的安全车距策略。该策略由意图识别层、跟随决策层、运动控制层3部分组成。意图识别层采集踏板信号,选择T-S模糊神经网络对加减速意图进行辨识;跟随决策层通过网联环境实时接收前车驾驶意图,计算期望安全车距与期望加速度;运动控制层建立车辆逆纵向动力学模型,将期望加速度转化为油门踏板开度与制动缸压力,实现车辆跟随控制。多工况仿真结果表明,考虑前车意图的车距策略实现了跟随车辆在前车不同驾驶意图下的稳定车距跟随。

关键词：车辆工程车辆跟随间距策略驾驶意图网联车

Characteristics of subsurface density variations before the 4.20 Lushan M_s7.0 earthquake in the Longmenshan area: inversion results

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Earthquake Science 2015年第1期28卷 49-57页

作者： Songbai Xuan Chongyang Shen Hui Li hongtao hao School of Geodesy and Geomatics Wuhan University Institute of Seismology China Earthquake Administration

The 4.20 Lushan Ms7.0 earthquake occurred on the southwest segment of the Longmenshan fault on 20 April 2013. Some meaningful information on the prepa- ration and occurrence of this earthquake was found based on the dynamic variation of gravity （DVG）. To examine the great progress of the Lushan earthquake, we obtained the density variation （DENV） derived from the DVG using the compact gravity inversion method in this article. The inversion results reveal three main findings：（1） the DENV in the crust in the Jinshajiang fault area changed from positive in 2010-2011 to negative in 2011-2012. （2） The DENV in the Xianshuihe fault area decreased continuously from 2010 to 2012. （3） The DENV of the uppermost mantle of South China decreased in 2010-2011 and increased in 2011-2012. We propose that the flow/expansion of the middle-lower crust beneath the Bayan Har block and Moho subsidence on the southwest margin of the Chuan-Dian block may have been the major causes of the Lushan earthquake.

关键词： Density variations Gravity inversion Deepprogress Lushan earthquake

四川地区流动重力观测及其在地震预测中的应用

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大地测量与地球动力学 2024年第1期44卷 89-94页

作者：王伟力郑兵郝洪涛温军军刘宏伟马伶俐廖明辉四川省地震局地壳形变观测中心四川省雅安市625000 中国地震局地震大地测量重点实验室武汉市430071 湖北省地震局武汉市430071

通过回顾四川地区测网变迁和震例总结,客观阐述四川流动重力观测的发展历程及其在地震趋势判定中的应用效能。结果表明,利用流动重力资料观测到高梯度带、四象限分布、零值线拐弯等重力场时变异常信号,对川滇菱形块体内部及边界带发生... 详细信息

通过回顾四川地区测网变迁和震例总结,客观阐述四川流动重力观测的发展历程及其在地震趋势判定中的应用效能。结果表明,利用流动重力资料观测到高梯度带、四象限分布、零值线拐弯等重力场时变异常信号,对川滇菱形块体内部及边界带发生的汶川地震、芦山地震、九寨沟地震、泸定地震等地震进行了准确的中期预测,尤其在强震地点判定上预测效果较好,准确率达60%。

关键词：四川地区流动重力重力变化地震预测

Three-dimensional admittance analysis of lithospheric elastic thickness over the Louisville Ridge

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Earthquake Science 2016年第2期29卷 117-125页

作者： Minzhang Hu Hui Li Chongyang Shen Lelin Xing hongtao hao Key Laboratory of Earthquake Geodesy Institute of SeismologyChina Earthquake Administration

Using bathymetry and altimetric gravity anomalies, a 1°×9 1° lithospheric effective elastic thickness（Te） model over the Louisville Ridge and its adjacent regions is calculated using the moving window admittance technique. For comparison, three bathymetry models are used： general bathymetric charts of the oceans, SIO V15.1,and BAT_VGG. The results show that BAT_VGG is more suitable for calculating T e than the other two models. T e along the Louisville Ridge was re-evaluated. The southeast of the ridge has a medium Te of 10–20 km, while Te increases dramatically seaward of the Tonga-Kermadec trench as a result of the collision of the Pacific and IndoAustralian plates.

关键词： Three-dimensional admittance analysis Lithospheric effective elastic thickness Bathymetry Gravity Louisville Ridge

基于改进YOLOv5s的煤矿输送带异物检测算法

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宁夏工程技术 2024年第2期23卷 174-179页

作者：张炳建郝洪涛刘秀娟李泽旭宁夏大学机械工程学院宁夏银川750021

为了解决现有煤矿输送带异物检测模型存在的参数量大、占用计算机资源多、检测异物种类少等问题,对YOLOv5s目标检测算法进行了优化。首先,将轻量化卷积神经网络ShuffleNetv2作为YOLOv5s骨干网络并对异物图像进行了特征提取,进而减少了... 详细信息

为了解决现有煤矿输送带异物检测模型存在的参数量大、占用计算机资源多、检测异物种类少等问题,对YOLOv5s目标检测算法进行了优化。首先,将轻量化卷积神经网络ShuffleNetv2作为YOLOv5s骨干网络并对异物图像进行了特征提取,进而减少了模型参数量,提高了网络并行度;其次,将双向特征金字塔网络作为特征融合网络,融合了不同特征图尺度中的细节信息;最后,添加了坐标注意力机制,增强了特征提取能力,强化了异物目标关注度,从而提高了网络模型检测精度。实验结果显示,与原始模型相比,基于改进YOLOv5s的目标检测网络模型其参数量压缩为3.60×106个,检测帧率提升了8.4%,表明该算法能够在计算资源较少的情况下实现快速、准确的煤矿输送带异物检测。

关键词：煤矿输送带异物检测 YOLOv5s 特征融合网络注意力机制

Terrestrial water storage variation in Hebei plain area of China,based on ground surface gravimetry

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Geodesy and Geodynamics 2021年第3期12卷 190-196页

作者： hongtao hao Hongliang Liu Xinlin Zhang Jin Wei Bin Zhao Minzhang Hu Key Laboratory of Earthquake Geodesy Institute of SeismologyCEAWuhan430071China Gavitation and Earth Tide National Observation and Research StationWuhan430071China Hubei Earthquake Administration Wuhan430071China Mobile Survey Team of Hebei Earthquake Agency Baoding071000China

Variation of terrestrial water storage in the Hebei plain area from March 2010 to June 2014 was studied using ground gravimetry combined with vertical displacement data from the Global Navigation Satellite *** show that observed gravity variation in this area increased continuously,basically reflecting a trend toward land *** the effect of this subsidence removed,a dominantnegative change in gravity variation was evident,reflecting an average rate of decrease in terrestrial water in this area of 0.10±0.053 m/y,and this is equivalent to a volume of 81.5±43.2×108 m^(3)and is consistent with the spatial distribution of groundwater change from measured hydrologic *** results can be an essential reference and supplement for the study of terrestrial water variation in the Hebei plain area,and indicate that ground surface gravimetry can be used as an important mean for studying changes in terrestrial water.

关键词： Hebei plain area Gravity variation Terrestrial water storage variation Ground surface gravimetry Land subsidence

Gravity variation in the Tibet area before the Nepal Ms8.1 earthquake

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Geodesy and Geodynamics 2016年第6期7卷 425-431页

作者： hongtao hao Lelin Xing Ziwei Liu YUfei Han Hui Li Key Laboratory of Earthquake Geodesy Institute of SeismologyChina Earthquake AdministrationWuhan430071China Wuhan Base of Institute of Crustal Dynamics China Earthquake AdministrationWuhan430071China National Earthquake Infrastructure Service Beijing100045China

This research utilized two periods of gravity monitoring results from 2010 to 2013 from the Continental Tectonics Environmental Monitoring Network of China, analyzed the corre- lation between gravity variation in the Tibet area and the Nepal Ms8.1 earthquake, and investigated the gravity variation mechanism in combination with the crust vertical movement and horizontal strain field observed by Global Positioning System （GPS）. The research results indicated that （1） the gravity variation exhibited apparent characteristics of a positive anomaly and high gradient zone in the Himalayan frontier. This observation is consistent with the existing recognition of the gravity anomaly and occurrence regularity of a strong earthquake; （2） the gravity variation exhibited apparent consistence with the spacious distribution of the vertical movement and the horizontal deformation field in that area. The crustal vertical movement was not the direct cause leading to the gravity vari- ation. It is assumed that the crust stress-strain accumulation in the Qinghai-Tibetan Plateau and its adjacent areas is the important factor that resulted in the variation of gravity.

关键词： Continental Tectonics Environ-mental Monitoring Network ofChinaNepal Ms8.1 earthquakeGravity variationCrustal deformation

Temporal variation of gravity field prior to the Ludian Ms6.5 and Kangding Ms6.3 earthquakes

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Geodesy and Geodynamics 2015年第6期6卷 429-436页

作者： hao hongtao Wei Jin Hu Minzhang Liu Ziwei Li Hui Key Laboratory of Earthquake Geodesy Institute of SeismologyChina Earthquake Administration Wuhan Base of Institute of Crustal Dynamics China Earthquake Administration

Using mobile gravity data from the central area of Sichuan and Yunnan Provinces, the relationship between gravity variation and earthquakes was studied based on the Ludian Ms6.5 earthquake that occurred on August 3rd, 2014, and the Kangding Ms6.3 earthquake that occurred on November 22 nd, 2014; the mechanism of gravity variation was also explored. The results are as follows：（1） Prior to both earthquakes, gravity variation exhibited similar characteristics as those observed before both the Tangshan and Wenchuan earthquakes, in which typical precursor anomalies were positive gravity variation near the epicenter and the occurrence of a high-gravity-gradient zone across the epicenter prior to the earthquake.（2） A relatively accurate prediction of the occurrence locations of the two earthquakes was made by the Gravity Network Center of China（GNCC） based on these precursor anomalies. In the gravity study report on the 2014 earthquake trends submitted at the end of 2013, the Daofu-Shimian section at the junction of the Xianshuihe and Longmenshan fault zones was noted as an earthquake-risk region with a predicted magnitude of 6.5, which covered the epicenter of the Kangding Ms6.3 earthquake. In another report on earthquake trends in southwestern China submitted in mid-2014, the Lianfeng, Zhaotong fault zone was also classified as an earthquake-risk region with a magnitude of 6.0, and the central area of this region basically overlapped with the epicenter of the Ludian Ms6.5 earthquake.（3） The gravity variation characteristics are reasonably consistent with crustal movements, and deep material migration is likely the primary cause of gravity variation.

关键词： Ludian Ms6.5 earthquake Kangding Ms6.3 earthquak Gravity variation Gradient zone Mechanism of gravity variation Crustal movement Deep material migration Sichuan-Yunnan area