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Modeling of the large Miocene epithermal and porphyry gold deposits of Colombia using Monte Carlo simulations 哥伦比亚中新世大型浅成热液和斑岩金矿床的蒙特卡罗模拟
IF 0.9 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2022-02-07 DOI: 10.15446/esrj.v25n4.95289
Felipe Velásquez Ruiz, J. Martínez, Alejandra Tobón Acevedo, Alejandra Yepes Metaute, A. Zapata, Diana Paulina Cataño Salas
The Cauca metallogenic belt is an inter-Andean area located along the Cauca-Romeral fault zone, which is made up of a group of twelve Miocene magmatic-hydrothermal Au-Ag-Cu mineral deposits positioned between the Western and Central Cordillera of Colombia. In addition to being a widely developed region in exploration and exploitation with known Au endowments of over 1,700 tons, this area represents an exceptional metallogenetic laboratory for modeling a typical Andean-type mineralization from a calc-alkaline source with high Sr/Y ratios. Efficiency processes such as ion and halogen transport, oxygen fugacity and sulfur content have been extensively studied with a geochemical approach; however, the quantification and modeling of these efficiency processes currently debated. Through multiple iterations using Monte Carlo simulations (N > 2 million), the modeled reservoirs corresponding to the upper crust, using a high flux of dacitic magma of 0.007 km3/year and efficiencies of 1 – 2 %, showed that gold endowments bear heavily with magmatic and hydrothermal Au deposits in the Cauca Metallogenic Belt. Outcomes including Au endowments up to 1,000 tons can be obtained for reservoirs below 400 km3 of hydrous melt in brief mineralization intervals between 40 to 120 ka and for volumes of 400 to 800 km3 in a 120 to 200 ka window. In contrast, the hypothetical reservoirs for the lower and middle crust, through a basaltic calc-alkaline magma flux between 0.0007 and 0.0011 km3/year, an efficiency of ~0.7%, and pressures below 5 kbar, showed sufficient available content of exsolvable H2O and gold to feed the reservoirs in the upper crust or to generate gold deposits from them, but in longer time intervals (>1 Ma).
Cauca成矿带是一个安第斯山脉间区域,位于Cauca-Romeral断层带沿线,由位于哥伦比亚科迪勒拉西部和中部之间的12个中新世岩浆热液Au-Ag-Cu矿床组成。除了是一个勘探和开发广泛的地区,已知Au储量超过1700吨外,该地区还是一个特殊的成矿实验室,用于模拟具有高Sr/Y比的钙碱性来源的典型安第斯型矿化。利用地球化学方法对离子和卤素迁移、氧逸度和硫含量等效率过程进行了广泛的研究;然而,这些效率过程的量化和建模目前仍存在争议。通过使用蒙特卡罗模拟的多次迭代(N>200万),对应于上地壳的建模储层,使用0.007 km3/年的高英安质岩浆通量和1–2%的效率,表明金的禀赋与考卡成矿带的岩浆和热液金矿床有很大关系。在40至120ka的短暂矿化间隔内,含水熔体储量低于400km3的储层和120至200ka窗口内400至800km3的储层可获得高达1000吨的Au储量。相反,下地壳和中地壳的假设储层,通过0.0007至0.0011 km3/年之间的玄武岩-钙碱性岩浆通量,效率约为0.7%,压力低于5 kbar,显示出足够的可溶解H2O和金的有效含量,以供给上地壳的储层或从中生成金矿,但时间间隔较长(>1 Ma)。
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引用次数: 0
Anomalous geoelectric potential variations observed along a gas pipeline section in Argentine, possible intensification with variations of the Earth’s magnetic field 阿根廷天然气管道沿线观测到的异常地电位变化,可能随着地球磁场的变化而加剧
IF 0.9 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2022-02-07 DOI: 10.15446/esrj.v25n4.91059
P. Larocca, M. A. Arecco, A. C. Macrino
Significant anomalous geoelectric potential variations have been observed in a section of the NEUBA II gas pipeline along its route in the district of Saavedra, near the area of Goyena, province of Buenos Aires (Argentine), where it goes through major lithological, edaphological and hydrological variations. Detailed research was conducted, showing that these disturbances may be intensified with variations of the Earth’s magnetic field, during a magnetic storm, as the pipe-to-soil potential (PSP) values remained constant for weeks and then fluctuations from 0.1 V to 0.15 V were recorded in various parts of the pipeline. On the other hand, to provide another analysis of these variations, models based on the distributed source transmission line (DSTL) theory were used, proposing a uniform geoelectric field along the pipeline route. A design was proposed that would allow modeling the response of the pipeline to variations of induced geoelectric fields, taking into account their intensification based on points of discontinuity due to subsoil characteristics or differences in its structure. Good consistency was achieved between the observed and modeled PSPs. The analysis and monitoring of these PSPs is a useful tool to identify the potential risks caused by geomagnetically induced currents in the pipes that would increase the effects due to the structure or the environment in which it is buried.
在NEUBA II天然气管道沿其路线在(阿根廷)布宜诺斯艾利斯省Goyena地区附近的Saavedra地区的一段内观察到明显的异常地电势变化,该管道在该地区经历了主要的岩性、土壤和水文变化。进行了详细的研究,表明在磁暴期间,这些干扰可能随着地球磁场的变化而加剧,因为管道对土壤电位(PSP)值在数周内保持不变,然后在管道的各个部分记录到从0.1 V到0.15 V的波动。另一方面,为了对这些变化进行另一种分析,采用了基于分布式源输电线(DSTL)理论的模型,提出了沿管道路径的均匀地电场。提出了一种设计方法,允许对管道对感应地电场变化的响应进行建模,并考虑到由于底土特征或其结构差异而导致的不连续点的增强。观测到的PSPs与模拟的PSPs具有良好的一致性。对这些psp的分析和监测是一种有用的工具,可以识别由管道中地磁感应电流引起的潜在风险,这些电流会由于埋管的结构或环境而增加影响。
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引用次数: 1
Runoff Curve Number (CN model) Evaluation Under Tropical Conditions 热带条件下径流曲线数(CN模型)的评价
IF 0.9 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2022-02-07 DOI: 10.15446/esrj.v25n4.95321
Daniela Calero Mosquera, Fanny Hoyos Villada, Enrique A. Torres Prieto
In tropical countries the Curve Number method (CN) of the Soil Conservation Service (SCS) is widely used in civil engineering (to calculate drainage infrastructure) as well as in agricultural and environmental studies. However, little is known about the accuracy of CN method in tropical watersheds. To reveal the CN method accuracy, this study compares the CN method results with field data measured in an Andean micro watershed. For this, CN values for the tropical micro watershed "La Vega" were identified using the tables proposed by the SCS and its respective moisture and slope corrections (CNAMC2S); subsequently CN values were derived from 55 events (CNQ) in which runoff and rainfall were measured. It was observed a different of 27% between CNQ and CNAMC2S (CNQ = 80, CNAMC2S 58.1). According to that, the data shows that in the tropical micro watershed evaluated in this study, the SCS method overestimated runoff. The CN model of the SCS is strongly influenced by the antecedent humidity and its impact becomes stronger after high rainfalls records; however, the antecedent humidity influence was not observed in measured runoff data. Despite the CN – SCS model did not present a relationship between CN and precipitation, this relationship was observed in measure data. This study shows that CN method has some inaccuracies and it requires further studies to know its applicability in tropical conditions.  
在热带国家,土壤保护局(SCS)的曲线数法(CN)广泛用于土木工程(计算排水基础设施)以及农业和环境研究。然而,人们对CN方法在热带流域中的准确性知之甚少。为了揭示CN方法的准确性,本研究将CN方法的结果与在安第斯微流域测量的现场数据进行了比较。为此,使用SCS提出的表格及其相应的湿度和坡度校正(CNAMC2S)确定了热带微流域“La Vega”的CN值;随后,从55个测量径流和降雨量的事件(CNQ)中得出CN值。CNQ和CNAMC2S之间的差异为27%(CNQ=80,CNAMC2S 58.1)。据此,数据表明,在本研究评估的热带微流域中,SCS方法高估了径流量。SCS的CN模型受到前期湿度的强烈影响,在高降雨量记录后其影响变得更强;然而,在测量的径流数据中没有观察到先前的湿度影响。尽管CN–SCS模型没有显示CN与降水之间的关系,但在测量数据中观察到了这种关系。这项研究表明CN方法有一些不准确之处,需要进一步研究才能知道它在热带条件下的适用性。
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引用次数: 1
Factors affecting topographic thresholds in gully erosion occurrence and its management using predictive machine learning models 影响沟蚀发生地形阈值的因素及其使用预测机器学习模型的管理
IF 0.9 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2022-02-07 DOI: 10.15446/esrj.v25n4.95748
M. Valipour, N. Mohseni, S. Hosseinzadeh
Soil degradation induced by gully erosion represents a worldwide problem in the many arid and semi-arid countries, such as Iran. This study assessed: (1) the importance of variables that control gully erosion using the Boruta algorithm, (2) the relationship among causative variables and gullied locations using the evidential belief function model (EBF), and (3) gully erosion development using the algorithms of boosted regression tree (BRT) and support vector machine (SVM). Based on the results of the Boruta algorithm, slope, land use, lithology, plan curvature, and elevation were the most important factors controlling gully erosion. The results of the EBF model showed the predominance of gully erosion on rangeland and loess-marl deposition. The predominance of gullied locations on the concave positions, with the slope of 5°–20° in the vicinity of drainage lines, illustrates a preferential topographic zone and, therefore, a terrain threshold for gullying. The correlation of gullied locations with rangelands and weak soils in concave positions demonstrates that the interactions among soil characteristics, topography, and land use stimulate a low topographic threshold for gullies development. These relationships are consistent with the threshold concept that a given soil, land use, and climate within a given landscape encourage a given drainage area and a critical soil surface slope that are necessary for gully incision. Furthermore, the BRF-SVM had the highest efficiency and the lowest root mean square error, followed by BRT for predicting gully development, compared with LN-SVM algorithm. The application of two machine learning methods for predicting the gully head cut susceptibility in northern Iran showed that the maps generated by these algorithms could provide an appropriate strategy for geo-conservation and restoration efforts in gullying-prone areas.
在许多干旱和半干旱国家,如伊朗,由冲沟侵蚀引起的土壤退化是一个全球性问题。本研究评估了:(1)使用Boruta算法控制冲沟侵蚀的变量的重要性;(2)使用证据置信函数模型(EBF)控制成因变量与冲沟位置之间的关系;(3)使用增强回归树(BRT)和支持向量机(SVM)算法评估冲沟侵蚀发展。根据Boruta算法的结果,坡度、土地利用、岩性、平面曲率和高程是控制冲沟侵蚀的最重要因素。EBF模型的结果表明,草地上的冲沟侵蚀和黄土泥灰岩沉积占主导地位。凹入位置上的冲沟位置占主导地位,排水线附近的坡度为5°–20°,这说明了一个有利的地形带,因此,冲沟的地形阈值。冲沟位置与牧场和凹地弱土的相关性表明,土壤特征、地形和土地利用之间的相互作用激发了冲沟发育的低地形阈值。这些关系与阈值概念一致,即给定景观内的给定土壤、土地利用和气候会促进给定的排水区域和临界土壤表面坡度,这是冲沟切割所必需的。此外,与LN-SVM算法相比,BRF-SVM预测冲沟发育的效率最高,均方根误差最小,其次是BRT。将两种机器学习方法应用于预测伊朗北部沟头切割易感性表明,这些算法生成的地图可以为易受侵蚀地区的地质保护和恢复工作提供适当的策略。
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引用次数: 3
A Modelling Study by Factorial Design on GNSS Positioning 基于因子设计的GNSS定位建模研究
IF 0.9 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2022-02-07 DOI: 10.15446/esrj.v25n4.95060
V. Ilçi, Yasemin Şişman
Although researchers have widely studied the analysis and modelling of error sources on Global Navigation Satellite Systems positioning, some of these errors have not been eliminated significantly and only some of the Global Navigation Satellite System’s data are modelled. The present work was undertaken to determine the effect of different variables, namely: season, the number of visible satellites, and dilution of precision on the efficiency of horizontal and vertical CORS (Continuously Operating Reference Stations) positioning. For this aim, the CORS data was collected at 14 different test points during 600 epochs with 1-second intervals. Factorial designs supply an efficient solution to understand the impact of several factors on a response variable. A full factorial design with three factors at two levels was applied for these purposes. According to the results of the full factorial design, all factors significantly affected the response variable. Also, the interaction effects of factors were analysed on the CORS horizontal and vertical positioning. The regression equations were obtained for all situations.
尽管研究人员广泛研究了全球导航卫星系统定位误差源的分析和建模,但其中一些误差并没有被显著消除,只有全球导航卫星系的一些数据被建模。目前的工作是为了确定不同变量的影响,即:季节、可见卫星数量和精度稀释对水平和垂直CORS(连续运行参考站)定位效率的影响。为此,在600个时期内,以1秒的间隔在14个不同的测试点收集CORS数据。因子设计提供了一个有效的解决方案来理解几个因素对响应变量的影响。为了达到这些目的,采用了在两个水平上具有三个因素的全因子设计。根据全因子设计的结果,所有因素都显著影响反应变量。分析了各因素对CORS水平和垂直定位的影响。得到了所有情况下的回归方程。
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引用次数: 0
Geoid undulation prediction using ANNs (RBFNN and GRNN), multiple linear regression (MLR), and interpolation methods: A comparative study 基于人工神经网络(RBFNN和GRNN)、多元线性回归(MLR)和插值方法的大地水准面波动预测比较研究
IF 0.9 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2022-02-07 DOI: 10.15446/esrj.v25n4.91195
B. Konakoglu, Alper Akar
The present work aimed to develop a prediction model to estimate geoid undulation and to compare its efficiency with other methods including radial basis function neural network (RBFNN), generalized regression neural network (GRNN), multiple linear regression (MLR) and, ten different interpolation methods. In this study, the k-fold cross-validation method was used to evaluate the model and its behavior on the independent dataset. With this validation method, each of a k number of groups has the chance to be divided into training and testing data. The performances of the methods were evaluated in terms of the root mean square error (RMSE) mean absolute error (MAE), Nash–Sutcliffe efficiency coefficient (NSE), and correlation coefficient (R2) and using graphical indicators. The evaluation of the performance of the datasets obtained using cross-validation was done in two ways. If we accept the method having the minimum error result as the most appropriate method, the natural neighbor (NN) method in the DS#5 dataset gave better results than the other methods (RMSE=0.14173  m, MAE=0.09729 m, NSE=0.98986, and R2=0.99011. On the other hand, it has been observed that, the GRNN method exhibited the best performance, on average, with RMSE=0.18539 m, MAE=0.13676 m, NSE=0.98229, and R2=0.98249.
本工作旨在开发一个估计大地水准面起伏的预测模型,并将其与其他方法进行比较,包括径向基函数神经网络(RBFNN)、广义回归神经网络(GRNN)、多元线性回归(MLR)和十种不同的插值方法。在这项研究中,使用k倍交叉验证方法来评估模型及其在独立数据集上的行为。使用这种验证方法,k组中的每一组都有机会被划分为训练和测试数据。根据均方根误差(RMSE)、平均绝对误差(MAE)、纳什-萨克利夫效率系数(NSE)和相关系数(R2)并使用图形指标评估了这些方法的性能。通过两种方式对使用交叉验证获得的数据集的性能进行了评估。如果我们接受误差结果最小的方法作为最合适的方法,那么DS#5数据集中的自然邻居(NN)方法比其他方法给出了更好的结果(RMSE=0.414173 m,MAE=0.09729 m,NSE=0.8986,R2=0.99911)。另一方面,已经观察到,GRNN方法表现出最佳性能,平均而言,RMSE=0.18539 m,MAE=0.13676 m,NSE=0.98229,并且R2=0.98249。
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引用次数: 1
Seismic site classification of the Costa Rican Strong-Motion Network based on VS30 measurements and site fundamental period 基于VS30测量和场地基本周期的哥斯达黎加强震网络地震场地分类
IF 0.9 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2022-02-07 DOI: 10.15446/esrj.v25n4.93927
L. Pinzón, D. Hidalgo-Leiva, Aarón Moya-Fernández, Víctor Schmidt-Díaz, L. Pujades
In this paper, a new seismic site classification for the Costa Rican Strong-Motion Network (CRSMN) is proposed. The soil profile classification of the Costa Rican Seismic Code based on the average shear-wave velocity of the top 30 m (VS30) is used as a reference. The site fundamental period (Tf) is included as a parameter to complement the existing characterization. For this, the VS30 measurements from 52 accelerometric stations are related to the site fundamental period obtained through horizontal-to-vertical spectral ratios (HVSR) using ground motion records from the Costa Rican Strong-Motion Database. The H/V ratios are estimated with 5% damped acceleration response spectra and with traditional Fourier amplitude spectra from the S-wave window. From the relation between VS30 and Tf, different ranges of Tf are assigned to the existing soil profile classification and a graph with three-lines and four-areas is proposed to classify the stations of the CRSMN.
本文提出了哥斯达黎加强震台网(CRSMN)的一种新的地震场地分类方法。参考哥斯达黎加地震规范中基于顶部30m平均剪切波速(VS30)的土壤剖面分类。站点基本周期(Tf)作为一个参数被包括在内,以补充现有的特征。为此,52个加速度站的VS30测量值与现场基本周期有关,该周期通过使用哥斯达黎加强震数据库中的地面运动记录的水平与垂直频谱比(HVSR)获得。用5%阻尼加速度响应谱和来自S波窗口的传统傅立叶振幅谱来估计H/V比。根据VS30和Tf之间的关系,将Tf的不同范围分配给现有的土壤剖面分类,并提出了一个具有三条线和四个区域的图来对CRSMN的站点进行分类。
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引用次数: 6
Investigating the effects of groundwater level changes on GNSS observations in the Konya Closed Basin 调查科尼亚封闭盆地地下水位变化对全球导航卫星系统观测的影响
IF 0.9 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2022-02-07 DOI: 10.15446/esrj.v25n4.92490
H. Erdogan, O. Oktar, Cemil Gezgin, F. Poyraz, N. Arslan, F. Yilmazturk
The Konya Closed Basin (KCB) that inhabited by approximately 4 million people has a semi-arid climate and has been an important agricultural and economic production area with its alluvial fertile soils. In recent years, the use of groundwater as a main source in the intense need for irrigation in the basin due to climate change, drought and wrong agricultural policies triggered land subsidence in the basin by causing the aquifer system compaction. In this study, the effects of groundwater level changes obtained from groundwater monitoring stations on the positions of continuously operating GNSS stations located in KCB were investigated by time series analysis. As a result of trend component analyses of time series processed based on the ITRF08 fixed frame, it was determined that the horizontal positions of stations in this region were moving in the northeast direction (18.88 mm/year). For the up coordinates, while stations ANRK, KLUU, and NIGD had movements (0.56 mm/year) in the up direction, the other stations moved in the down direction. The vertical movement of KNY1 station based on 560-day data was in the down (-) direction, with an annual movement of 70.96 mm, and this was the maximum movement or velocity compared to the other stations in this region. The trend analysis of 19 wells revealed linear groundwater level changes in the down direction with a mean value of -39.22 cm/year. The decrease in the water level of the wells in the Konya Closed Basin was statistically significant for the majority of the wells and at meter level in some wells. It was determined that the linear decrease was generally caused by the reduced level of groundwater in this region. The periodic component analysis showed that the movements of the GNSS stations changed from a day to a year due to several factors, such as atmospheric and hydrological loading and climatic effects.
科尼亚封闭盆地(KCB)约有400万人口,气候半干旱,是一个重要的农业和经济生产区,拥有冲积肥沃的土壤。近年来,由于气候变化、干旱和错误的农业政策,地下水作为流域灌溉需求的主要来源,导致含水层系统压实,从而引发了流域地面沉降。在本研究中,通过时间序列分析研究了地下水监测站获得的地下水位变化对位于KCB的连续运行的GNSS站位置的影响。根据ITRF08固定框架处理的时间序列趋势分量分析结果,确定该地区台站的水平位置向东北方向移动(18.88毫米/年)。对于向上坐标,当ANRK、KLUU和NIGD站在向上方向上移动(0.56 mm/年)时,其他站在向下方向上移动。根据560天的数据,KNY1站的垂直移动方向为向下(-),年移动量为70.96毫米,这是与该地区其他站相比的最大移动或速度。对19口井的趋势分析显示,地下水位呈线性向下变化,平均值为-39.22厘米/年。Konya封闭盆地中大多数水井的水位下降具有统计学意义,一些水井的水位降至米级。经确定,线性下降通常是由该地区地下水水位下降引起的。周期成分分析表明,由于大气和水文负荷以及气候影响等若干因素,全球导航卫星系统台站的移动从一天变为一年。
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引用次数: 1
Petrographic and geochemical features of Gimo marble, Gole area, Kurdistan Region, Iraq: constraints on its protolith's origin and depositional environment 伊拉克库尔德斯坦地区Gole地区Gimo大理岩的岩石学地球化学特征:对其原岩成因和沉积环境的制约
IF 0.9 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2021-10-27 DOI: 10.15446/ESRJ.V25N3.88686
Tola A. Mirza, S. Kalaitzidis, Sardar S. Fatah, Sophia Tsiotou
It is essential to identify marbles' petrographic and geochemical characteristics to determine the palaeo-environmental settings where their carbonate protoliths formed. The petrogenesis of massive Gimo marbles in the Gole area, Kurdistan Region of northeast Iraq, was investigated in this study through a combination of field mapping, petrographic, and geochemical techniques. Petrographic examination of these marbles reveals that mineral compositions are similar in all samples, with both homeoblastic and mosaic textures occurring, in addition to opaque grains that provide evidence of mineralization. Geochemical analyses show that the average calcium carbonate content of the marble is 94.96%; hence, the marble is lithologically characterized as a pure calcite marble. In most samples, the silica content was below 2 wt.%, with high values related to quartz veinlets. A range of geochemical indices and Post-Archean Australian Shale (PAAS–normalized rare earth element (REE) patterns) suggest that the limestone protolith was deposited in a shallow, near-shore marine environment on a continental margin, with very low input of detrital material. The negative Ce anomalies indicate that the protoliths of the Gimo marbles were carbonate rocks of a sedimentary origin.
确定大理岩的岩相和地球化学特征对于确定其碳酸盐原岩形成的古环境环境至关重要。本研究采用野外测绘、岩石学和地球化学技术相结合的方法,对伊拉克东北部库尔德斯坦地区戈勒地区大型Gimo大理石的岩石成因进行了研究。对这些大理石的岩石学检查表明,所有样品的矿物成分相似,除了提供矿化证据的不透明颗粒外,还出现了同源变晶和镶嵌结构。地球化学分析表明,大理岩的平均碳酸钙含量为94.96%;因此,该大理石在岩性上具有纯方解石大理石的特征。在大多数样品中,二氧化硅含量低于2wt.%,高值与石英细脉有关。一系列地球化学指数和后太古宙澳大利亚页岩(PAAS–归一化稀土元素(REE)模式)表明,石灰岩原岩沉积在大陆边缘的浅水近岸海洋环境中,碎屑物质的输入非常低。Ce负异常表明Gimo大理岩的原岩为沉积成因的碳酸盐岩。
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引用次数: 0
Electrical and magnetic data time series’ observations as an approach to identify the seismic activity of non-anthropic origin 电磁数据时间序列观测作为识别非人类起源地震活动的一种方法
IF 0.9 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2021-10-27 DOI: 10.15446/ESRJ.V25N3.95782
Juan Manuel Solano Fino, A. Caneva, C. Jiménez, L. H. Ochoa
In this work, the authors tried to identify a possible relationship between electromagnetic signals (EM) and seismic events in the lithospheric system in the central region of Colombia. The data, both seismic records and electromagnetic signals, were taken from the catalog of the Seismological Network of the National University of Colombia (RSUNAL) and the catalog of the National Seismological Network of Colombia (RSNC). The project included the design and instrument testing phases for recording seismic signals, electrical potential variations, and magnetic field variations to try to identify possible relationships between these signals. Possible electromagnetic precursors for seismic events were observed, mainly magnetic disturbances, but it was not possible to locate evident electrical anomalies (Seismic Electric Signals - SES). Thus, although the results are not conclusive, the magnetic disturbances identified deserve further long-term analysis.
在这项工作中,作者试图确定哥伦比亚中部岩石圈系统中电磁信号(EM)与地震事件之间的可能关系。地震记录和电磁信号数据均取自哥伦比亚国立大学地震台网目录和哥伦比亚国家地震台网目录。该项目包括记录地震信号、电位变化和磁场变化的设计和仪器测试阶段,试图确定这些信号之间的可能关系。观测到了地震事件的可能电磁前兆,主要是磁扰动,但无法定位明显的电异常(地震电信号-SES)。因此,尽管结果不是决定性的,但所发现的磁扰动值得进一步的长期分析。
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引用次数: 1
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