| 利用改进模拟退火算法反演甘肃兰州地区地幔转换带导电模型 |
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| 引用本文： | 翁爱华,郭峻豪.利用改进模拟退火算法反演甘肃兰州地区地幔转换带导电模型[J].地球科学与环境学报,2021(2):332-342. |
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| 作者姓名： | 翁爱华 郭峻豪 |
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| 作者单位： | 吉林大学地球探测科学与技术学院 |
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| 基金项目： | 国家自然科学基金项目(42074080)。 |
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| 摘 要： | 地磁测深一维反演可以获得地磁台站下方地球深部电导率结构。将改进模拟退火算法应用于地磁测深数据的反演,并将基于反演过程中的所有优质解进行统计分析得到的期望值作为模型最优解。地磁测深合成数据的一维反演测试结果表明:对于无噪声的理论数据,传统模拟退火算法可以恢复出真实的电导率剖面;存在噪声时,相较传统模拟退火算法,改进模拟退火算法可以有效克服噪声影响,并在噪声低于可接受的水平时,得到非惟一模型参数的可靠估计结果。对兰州台站的实际数据反演结果表明:在地磁测深敏感的深度范围内获得了与前人一致的电导率剖面;但是在地幔转换带下层,反演得到的电导率偏低。结合岩石物理实验结果,推测兰州地区地幔转换带下层可能是干冷的,周围地区深部地幔柱可能影响不到兰州地区深部热状态。
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| 关 键 词： | 地磁测深 电导率 模拟退火算法 统计分析 地幔转换带 反演 噪声 兰州 |
Electrical Conductivity Beneath Lanzhou Area of Gansu,China Inverted from Geomagnetic Depth Sounding by Using Improved Simulating Annealing Algorithm |
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| WENG Ai-hua,GUO Jun-hao.Electrical Conductivity Beneath Lanzhou Area of Gansu,China Inverted from Geomagnetic Depth Sounding by Using Improved Simulating Annealing Algorithm[J].Journal of Earth Sciences and Environment,2021(2):332-342. |
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| Authors: | WENG Ai-hua GUO Jun-hao |
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| Institution: | (College of Geo-exploration Science and Technology,Jilin University,Changchun 130026,Jilin,China) |
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| Abstract: | Geomagnetic depth sounding one-dimensional inversion can obtain the deep earth electrical conductivity structure beneath a geomagnetic station.The improved simulated annealing algorithm was applied to the inversion of geomagnetic depth sounding data,and the expected value based on the statistical analysis of all high-quality solutions in the inversion was used as the optimal solution of the model.The one-dimensional inversion results of synthetic geomagnetic depth sounding data show that for the noise-free theoretical data,the traditional simulated annealing algorithm can restore the true electrical conductivity profile;when there is noise,compared with the traditional simulated annealing algorithm,the improved simulated annealing algorithm can effectively overcome the influence of noise,and when the noise is below an acceptable level,the reliable estimation results of non-unique model parameters can be obtained.The inversion results of actual data from Lanzhou station show that in the sensitive depth range of geomagnetic depth sounding,the electrical conductivity profile is consistent with the previous ones;but in the lower mantle transition zone,the electrical conductivity is obtained by the inversion is relatively low.Based on the results of petrophysical experiments,it can be speculated that the lower layer of mantle transition zone beneath Lanzhou area may be dry and cold,and the deep mantle plume in the surrounding area may not affect the deep thermal state of Lanzhou area. |
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| Keywords: | geomagnetic depth sounding electrical conductivity simulated annealing algorithm statistical analysis mantle transition zone inversion noise Lanzhou |
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