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主要介绍各种地震定位方法,概述各种地震定位方法的基本原理,重点介绍Geiger的经典方法以及在此基础上建立的各种线性方法:单一地震事件定位法与多个地震事件定位法以及对每一种地震定位方法的应用情况,尤其是国内的应用情况做了总结;同时指出各种方法的特点,并进行相应的比较. 相似文献
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利用曲线拟合法对山东流动重力部分具有趋势性变化的异常测点进行了拟合改正,获取更可靠的重力变化信息,并对趋势性变化显著的测点进行了分析和讨论。 相似文献
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Wang Hanpeng Liu Zhongzhong Wang Su Hou Weitao Yu Guofeng 《Geotechnical and Geological Engineering》2022,40(4):2063-2075
Geotechnical and Geological Engineering - Geological sequestration of greenhouse gases has gained extensive attentions in recent years, but the degradation law of mechanical parameters and the... 相似文献
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金华地区位于金衢盆地东段,对其地下水同位素特征及更新能力研究对于整个盆地地下水资源研究具有重要意义,通过分析研究区内稳定同位素氘(D)和氧(~(18)O)以及放射性同位素氚(~3H)和碳(~(14)C)的空间分布特征,建立了金华地区降水线方程为:δD=8.29δ~(18)O+15.9,讨论了地表水、潜水、红层地下水的环境同位素的组成特征,对潜水及红层地下水的更新能力进行了评价。结果表明,金华地区降水线方程斜率及截距均大于全球大气降水;潜水、红层地下水及地表水三者联系密切;潜水、红层地下水在接受降水的补给后经历了不同程度的蒸发作用;红层地下水D和~(18)O同位素明显向下游富集;潜水~3H值介于6.6~19.0TU,~(14)C年龄显示为现代水,因此其可更新能力较强,红层地下水放射性~(14)C年龄为3020~5360BP,可更新能力较弱,红层地下水3H值介于4.4~12.3TU,表明红层地下水中有现代水的混入,δ~(18)O随着地下水的年龄的增加而偏负。 相似文献
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利用山东地区2010—2012年6期流动重力测量资料,研究了鲁南网重力场的变化特征。结果表明重力场呈明显的季节性变化,即每年的3月与8月,重力场存在反向变化,变化幅值相近;季节性变化与降水有关。 相似文献
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Kunhong Li Zhining Liu Bin She Hanpeng Cai Yaojun Wang Guangmin Hu 《Geophysical Prospecting》2021,69(1):85-100
Dictionary learning is a successful method for random seismic noise attenuation that has been proven by some scholars. Dictionary learning–based techniques aim to learn a set of common bases called dictionaries from given noised seismic data. Then, the denoising process will be performed by assuming a sparse representation on each small local patch of the seismic data over the learned dictionary. The local patches that are extracted from the seismic section are essentially two‐dimensional matrices. However, for the sake of simplicity, almost all of the existing dictionary learning methods just convert each two‐dimensional patch into a one‐dimensional vector. In doing this, the geometric structure information of the raw data will be revealed, leading to low capability in the reconstruction of seismic structures, such as faults and dip events. In this paper, we propose a two‐dimensional dictionary learning method for the seismic denoising problem. Unlike other dictionary learning–based methods, the proposed method represents the two‐dimensional patches directly to avoid the conversion process, and thus reserves the important structure information for a better reconstruction. Our method first learns a two‐dimensional dictionary from the noisy seismic patches. Then, we use the two‐dimensional dictionary to sparsely represent all of the noisy two‐dimensional patches to obtain clean patches. Finally, the clean patches are patched back to generate a denoised seismic section. The proposed method is compared with the other three denoising methods, including FX‐decon, curvelet and one‐dimensional learning method. The results demonstrate that our method has better denoising performance in terms of signal‐to‐noise ratio, fault and amplitude preservation. 相似文献
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应用振幅谱反演方法,对2009年3月25日黄海M_L 4.0地震的震源机制进行求解。在震源位置固定情况下,得到此次地震的地震矩为7.17×10~(14)N·m,矩震级约3.8级,最佳震源机制解为:走向40°,倾角80°,滑动角150°,与震中附近区域的中国断层线走向基本吻合。 相似文献
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通过分析昌邑-新河测段1991~2019年LCR-G型与CG-5型相对重力仪的相对重力观测数据和测点附近水文资料发现:1)2009~2018年相对重力观测值持续增大的主要原因为昌邑市地下水位下降,水位降低的最大影响可达132 μGal;2)2014-05~2016-03相对重力累计下降72 μGal,并在2016-03~2018-05快速回升,这一现象是否与动力学原因有关尚不明确。 相似文献
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