Acta Geodaetica et Geophysica最新文献

Surface-fitting by partitioned multiple regression equations in oblique territories and its use in coordinate transformations 斜域上分割多元回归方程的曲面拟合及其在坐标变换中的应用

IF 1.8 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2025-09-30 DOI: 10.1007/s40328-025-00475-0

Andrew Carey Ruffhead

{"title":"Surface-fitting by partitioned multiple regression equations in oblique territories and its use in coordinate transformations","authors":"Andrew Carey Ruffhead","doi":"10.1007/s40328-025-00475-0","DOIUrl":"10.1007/s40328-025-00475-0","url":null,"abstract":"<div><p>A bivariate polynomial is an important type of explicit function that can approximate a physical quantity that varies continuously and smoothly over a surface. Such functions can be derived by successive least-squares optimisations which determine which terms are statistically significant, the results being designated as multiple regression equations (MREs). One application is coordinate shifts from one geodetic positioning system (datum) to another. Recent research has found accuracy benefits from partitioned MREs in which two polynomials are joined together smoothly, reducing the need for high-power terms. Case studies from that research suggested that partitioning should be across whichever of the north–south and east–west extents was the greater. The paper investigates whether diagonal partitioning is best for data in oblique territories (where the line of greatest extent is diagonal). The case study selected was coordinate transformations in Slovenia which is relatively oblique. Oblique partitioning was not in itself an improvement on east–west partitioning but became so when contributing to two hybrid models. More research is needed but results so far suggest that the best course is to test all partitioning options and apply the one that gives the closest fit to the particular data.</p></div>","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":"60 3","pages":"357 - 373"},"PeriodicalIF":1.8,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the dynamic variability of global positioning system (GPS) derived precipitable water vapour (PWV) over three geographical regions of Nepal 尼泊尔三个地理区域全球定位系统（GPS）衍生可降水量（PWV）的动态变率

IF 1.8 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2025-09-04 DOI: 10.1007/s40328-025-00471-4

Nisarga Sharma, Arnav Subedi, Basudev Ghimire, Shreeram Nagarkoti, Balaram Khadka

引用次数: 0

Sub-regional Taylor-series modeling of the gravity potential based on von Eötvös’ torsion balance measurements 基于von Eötvös扭转平衡测量的重力势的分区域泰勒级数模拟

IF 1.8 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2025-09-01 DOI: 10.1007/s40328-025-00473-2

Gibárt Gilányi, Gábor Molnár

{"title":"Sub-regional Taylor-series modeling of the gravity potential based on von Eötvös’ torsion balance measurements","authors":"Gibárt Gilányi, Gábor Molnár","doi":"10.1007/s40328-025-00473-2","DOIUrl":"10.1007/s40328-025-00473-2","url":null,"abstract":"<div><p>This paper introduces a technique for modeling the gravity potential using a low-degree Taylor series expansion, specifically of three or four degrees and demonstrates its practical application. The coefficients for this gravity model are the derivatives of the gravity potential at a specified point. The coefficients are determined through Von Eötvös’ torsion balance measurements conducted on the ice sheet of Lake Balaton in Hungary, by minimizing the squares of the difference between the nearby measured (by torsion balance) and calculated second derivatives of gravity potential. The model is applicable over an area spanning several kilometers, encompassing multiple torsion balance measurements, and thus provides broader coverage compared to a strictly local model, thereby justifying its classification as a sub-regional model. The resulting gravity potential field is presented on two types of map, similarly to Eötvös’ work. The derived model characterizes the gravitational potential for the region where measurements were taken, yet it behaves unexpectedly and generates artifacts beyond this measurement area. Earlier geoid models for this region included torsion balance data; in contrast, our results provide a more detailed gravity potential model over a more confined area.</p></div>","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":"60 3","pages":"335 - 356"},"PeriodicalIF":1.8,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40328-025-00473-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evidence of shear and tensile fracturing in the western desert earthquakes, Egypt 埃及西部沙漠地震中剪切和拉伸断裂的证据

IF 1.8 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2025-07-01 DOI: 10.1007/s40328-025-00472-3

Hamada Saadalla, Saleh Qaysi, Abdalla Abdelnabi

{"title":"Evidence of shear and tensile fracturing in the western desert earthquakes, Egypt","authors":"Hamada Saadalla, Saleh Qaysi, Abdalla Abdelnabi","doi":"10.1007/s40328-025-00472-3","DOIUrl":"10.1007/s40328-025-00472-3","url":null,"abstract":"<div><p>In this study, a widely used moment tensor decomposition scheme and source-type plot diagrams are applied to determine the source type and mechanism of recent earthquakes in northwestern and southern Egypt. First, the full-waveform moment tensor inversion is conducted to determine the optimal faulting mechanism using an appropriate 1-D structural velocity model. Second, the complete moment tensors are decomposed into deviatoric (DEV) and isotropic (ISO) components. The earthquakes in the northwestern Dahshour region exhibit ISO components ranging from 9.2 to 38.7%, while those in the Aswan region have ISO components ranging from 2.6 to 56.4%, indicating tensile/compressive nature of fracturing. This suggests that in the Dahshour region, cracks may open or close at the source due to fluid extraction and/or injection. Similarly, earthquakes in the Aswan region are likely influenced by the charge/discharge circulation of the High Dam reservoir. Our findings suggest that in addition to natural dynamic and tectonic factors, secondary anthropogenic influences play a role in controlling seismic activity in the investigated regions. Identifying the source type and mechanism of non-double-couple earthquakes is crucial for time-dependent seismic hazard assessment, particularly in areas where large-scale fluid operations are ongoing.</p></div>","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":"60 3","pages":"313 - 333"},"PeriodicalIF":1.8,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248310","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigations into geological structure of Gulf of Saros and Gelibolu peninsula by using airborne magnetic data 利用航空磁资料研究沙罗斯湾和格里波卢半岛的地质构造

IF 1.8 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2025-06-19 DOI: 10.1007/s40328-025-00468-z

Ezgi Erbek-Kıran, Abdullah Ateş

引用次数: 0

The H-factor in regional geoid modelling: a case study with different scenarios 区域大地水准面模拟中的h因子：不同情景的案例研究

IF 1.8 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2025-06-14 DOI: 10.1007/s40328-025-00470-5

C. J. Nyoka, A. H. M. Din, M. F. Pa’suya, P. A. Odera

{"title":"The H-factor in regional geoid modelling: a case study with different scenarios","authors":"C. J. Nyoka, A. H. M. Din, M. F. Pa’suya, P. A. Odera","doi":"10.1007/s40328-025-00470-5","DOIUrl":"10.1007/s40328-025-00470-5","url":null,"abstract":"<div><p>In order to satisfy the Stokes’ solution to the Robin’s problem, the masses above the geoid are removed using an appropriate reduction scheme. This requires heights of the gravity station and at the integration or running points to be known with reasonable accuracy. The height data is used to compute the topographic, atmospheric, and downward continuation effects—essential elements of any geoid model—as well as to estimate free-air gravity anomalies. The height of the gravity station is usually tied to the local vertical network using standard heighting methods, ideally spirit levelling, while a Digital Elevation Model (DEM) is used to derive the heights at the integration points. In most developing countries, the gravity station heights are either not available or are unreliable for geoid modelling applications, since they were mostly observed to cater for the needs of geophysical exploration. By the end of the day, the geodesist has to accommodate the height information in the integral equations for computing topographical effects using the data available in the country. In this study, the different options for height information are investigated using the data available in Auvergne, central France. Geoid models are computed using different height data combinations to represent different scenarios which exist in different countries. Spherical one-dimensional (1D) Fourier transform is used to evaluate the Stokes’ integral in the framework of the Remove-Compute-Restore (RCR) technique. Results show that orthometric heights derived from a high-resolution Global Geopotential Model (GGM) with ellipsoidal heights may be as good as, if not better than, spirit-levelled heights, when used at the gravity station.</p></div>","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":"60 2","pages":"243 - 270"},"PeriodicalIF":1.8,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145143461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

IF 1.8 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2025-06-10 DOI: 10.1007/s40328-025-00466-1

Sebahattin Bektas

{"title":"Symmetric similarity 3D coordinate transformation based on dual quaternion algorithm","authors":"Sebahattin Bektas","doi":"10.1007/s40328-025-00466-1","DOIUrl":"10.1007/s40328-025-00466-1","url":null,"abstract":"<div><p>Nowadays, dual quaternion algorithms are used in 3D coordinate transformation problems due to their advantages. The 3D coordinate transformation problem is one of the important problems in geodesy. This transformation problem is encountered in many application areas other than geodesy. Although there are many coordinate transformation methods (similarity, affine, projective, etc.), similarity transformation is used because of its simplicity. Asymmetric transformation is preferred over symmetric coordinate transformation because of its ease of use. In terms of error theory, the symmetric transformation should be preferred. This study discusses the topic of symmetric similarity 3D coordinate transformation based on the dual quaternion algorithm, as well as the bottlenecks encountered in solving the problem and using the solution method. A new iterative algorithm based on the dual quaternion is presented. The solution is implemented in two models: with and without constraint equations. The advantages and disadvantages of the two models compared to each other are also evaluated. Not only the transformation parameters but also the errors of the transformation parameters are determined. The detailed derivation of the formulas for estimating the symmetric similarity of 3D transformation parameters is presented step by step. Since symmetric transformation is the general form of asymmetric transformation, we can also obtain asymmetric transformation results with a simple modification of the model we developed for symmetric transformation. The proposed algorithm can perform both 2D and 3D symmetric and asymmetric similarity transformations. For the 2D transformation, replacing the z and Z coordinates in both systems with zero is sufficient.</p></div>","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":"60 2","pages":"271 - 297"},"PeriodicalIF":1.8,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145143110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Latitudinal propagation and solar wind drivers of Pc5 pulsations during the June 2015 geomagnetic storm 2015年6月地磁风暴期间Pc5脉动的纬向传播和太阳风驱动

IF 1.8 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2025-05-20 DOI: 10.1007/s40328-025-00469-y

J. A. Lazzús, I. Salfate, M. N. Castillo, J. Lorca-Castillo, C. Olivares-Salazar, A. Rivera-Zepeda

{"title":"Latitudinal propagation and solar wind drivers of Pc5 pulsations during the June 2015 geomagnetic storm","authors":"J. A. Lazzús, I. Salfate, M. N. Castillo, J. Lorca-Castillo, C. Olivares-Salazar, A. Rivera-Zepeda","doi":"10.1007/s40328-025-00469-y","DOIUrl":"10.1007/s40328-025-00469-y","url":null,"abstract":"<div><p>This study investigates the occurrence of Pc5 pulsations in the 2 to 7 mHz range at mid and low latitudes during the severe geomagnetic storm of June 21–24, 2015. This analysis employs two ground-based magnetic stations from the SAMBA network at magnetic latitudes − 16.55 and − 49.74, located in Chile and Antarctica, respectively, to explore the latitudinal distribution and drivers of Pc5 pulsations throughout the storm. Our results reveal that the intense pulsations recorded at low latitudes are synchronized with those observed at mid-latitudes and coincide with the arrival of the four interplanetary shocks associated with this event. Notably, the amplitudes of Pc5 pulsations exhibit significant latitudinal dependence, decreasing as they propagate from mid to low latitudes. Cross-correlation analyses highlight strong relationships between Pc5 amplitudes and solar wind parameters, indicating that solar wind dynamics played a critical role in the generation and propagation of these pulsations during this storm.</p></div>","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":"60 2","pages":"205 - 217"},"PeriodicalIF":1.8,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145144390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of the UNB topographical density model on geoid determination of Sarajevo, Bosnia & Herzegovina UNB地形密度模型对波黑萨拉热窝大地水准面确定的影响

IF 1.8 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2025-05-12 DOI: 10.1007/s40328-025-00467-0

Dževad Krdžalić, Džanina Omićević, Esad Vrce, Ervin Redžepagić, Jasmin Ćatić, Ramazan Alpay Abbak

引用次数: 0

Rapid 3D cross-correlation imaging of potential field data for mapping iron deposits: a case study from the Shavaz region 位场数据的快速三维相互关联成像用于铁矿测绘：Shavaz地区的一个案例研究

IF 1.8 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2025-04-18 DOI: 10.1007/s40328-025-00462-5

Saeed Ghanbarifar, Seyed Hossein Hosseini, Fardin Jokar, Maysam Abedi, Ali Moradzadeh

{"title":"Rapid 3D cross-correlation imaging of potential field data for mapping iron deposits: a case study from the Shavaz region","authors":"Saeed Ghanbarifar, Seyed Hossein Hosseini, Fardin Jokar, Maysam Abedi, Ali Moradzadeh","doi":"10.1007/s40328-025-00462-5","DOIUrl":"10.1007/s40328-025-00462-5","url":null,"abstract":"<div><p>This study explores the application of a rapid 3D cross-correlation imaging technique for analyzing potential field gravity and magnetic data. The approach involves calculating cross-correlation values between observed potential field anomalies and theoretical data, followed by the assessment of correlation coefficients. The method's efficacy was demonstrated through preliminary tests on various synthetic models with differing characteristics, highlighting its ability to detect and accurately locate subsurface sources, even in complex scenarios with inclined and multiple sources. The 3D imaging outcomes provided comprehensive insights into the location and center of anomaly sources. The methodology was then applied to ground magnetic and gravity datasets to evaluate the spatial distribution of underground iron deposits in the Shavaz region. The results closely matched drilling data and prior studies in the area, reinforcing the technique's effectiveness in interpreting real geophysical data. This research emphasizes the advantages of the cross-correlation imaging method in enhancing the understanding of subsurface structures, revealing hidden anomalies, and estimating the depth and arrangement of buried features.</p></div>","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":"60 2","pages":"179 - 204"},"PeriodicalIF":1.8,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145144151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0