Acta Geodaetica et Geophysica最新文献

Spatial variations of entropy and GRACE-FO derived equivalent water height for the 2021 Bandar Abbas Earthquake 熵的空间变化和GRACE-FO计算的2021年阿巴斯港地震等效水高

IF 2.6 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2026-07-01 DOI: 10.1007/s40328-026-00510-8

Muhammed Hossein Mousavi, Parva Sadeghi Alavijeh, Amir Talebi, Amirreza Moradi

{"title":"Spatial variations of entropy and GRACE-FO derived equivalent water height for the 2021 Bandar Abbas Earthquake","authors":"Muhammed Hossein Mousavi, Parva Sadeghi Alavijeh, Amir Talebi, Amirreza Moradi","doi":"10.1007/s40328-026-00510-8","DOIUrl":"10.1007/s40328-026-00510-8","url":null,"abstract":"<div><p>The current study analyzes the spatial variations of seismicity and accompanying hydrological perturbations during January 2006 to October 2024, using earthquake catalog data from the Iranian Seismological Center (IRSC) and GRACE-FO satellites Equivalent Water Height (EWH) variations. Seismic complexity was estimated from Shannon entropy and the Tsallis entropy index for the description of non-extensivity. Abrupt degradation of entropy began ~ 2.5 years before the Mw 6.3 Bandar Abbas earthquake (14 November 2021), testifying to gradual structural organization, asperity locking, and building up of stresses. The pattern reversed after the mainshock, with an increase of entropy in the first year of the postseismic period and remaining at a weaker level for the following 2.5 years, consistent with crustal relaxation and redistribution of stresses. The entropic index <i>q</i> = 1.71 was derived from the non-extensive analysis of the earthquake magnitude-frequency distribution in the study region. This value indicates correlated and non-equilibrium seismic behavior, consistent with previous studies in tectonically active regions. GRACE-FO-derived EWH anomalies showed similar spatial patterns, with weak changes 2.5 years before the earthquake, intensification one year prior, and regional maxima six months before the event. After the earthquake, anomalies strengthened within six months, expanded after one year, and weakened after 2.5 years, reflecting hydromechanical processes such as groundwater redistribution and fault-related fluid flow. The simultaneous evolution of entropy and EWH anomalies supports a coupled geophysical–hydrological seismic cycle in the Southern Zagros and highlights the value of integrating statistical seismology with satellite gravimetry for monitoring seismic processes in active tectonic regions.</p></div>","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":"61 3","pages":"633 - 650"},"PeriodicalIF":2.6,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965306","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

Inversion of self-potential anomalies caused by 2D inclined sheets using Harris Hawks optimization 利用Harris Hawks优化反演二维倾斜层的自电位异常

IF 2.6 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2026-06-30 DOI: 10.1007/s40328-026-00490-9

Mojtaba Babaei, Mohammad Rezaie

{"title":"Inversion of self-potential anomalies caused by 2D inclined sheets using Harris Hawks optimization","authors":"Mojtaba Babaei, Mohammad Rezaie","doi":"10.1007/s40328-026-00490-9","DOIUrl":"10.1007/s40328-026-00490-9","url":null,"abstract":"<div><p>Inversion of Self-Potential (SP) data poses a significant challenge in exploration geophysics due to the inherent non-linearity and presence of multiple local optima. This study presents the first application of Harris Hawks Optimization (HHO) algorithm for quantitative interpretation of SP data based on a dipole model characterized by polarization intensity (<span>(k)</span>) and pole positions (<span>(x_{1})</span>, <span>(z_{1})</span>, <span>(x_{2})</span>, <span>(z_{2})</span>). Unlike conventional optimization methods, HHO’s unique two-phase mechanism—dynamically transitioning between exploration and exploitation through soft and hard besiege strategies—provides superior capability in escaping local optima, a critical advantage for the highly non-linear SP inverse problem. Validation on synthetic data (noise-free and 5–25% Gaussian noise) demonstrated exceptional accuracy, with relative errors below 2.54% for noise-free cases and <span>({R}^{2}=0.9725)</span> at 15% noise level. Comprehensive benchmarking against three established algorithms (PSO, GA, WOA) over 30 independent runs revealed HHO’s competitive performance (mean RMS = 25.012 mV, SD = 0.029 mV), achieving stability comparable to PSO while requiring no algorithm-specific parameter tuning. Parameter sensitivity analysis identified <span>({x}_{1})</span> as the most influential parameter (normalized sensitivity = 1.0). Field validation on SP data from Surda copper mine, India, yielded excellent agreement (RMS = 5.69 mV, <span>({R}^{2}=0.9982)</span>), with interpretations consistent with regional geology and previous studies. These results establish HHO as a robust, accurate, and practically viable tool for SP data inversion in mineral exploration.</p></div>","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":"61 3","pages":"383 - 414"},"PeriodicalIF":2.6,"publicationDate":"2026-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965301","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

Gravity modeling and seismic interpretation to identify deep structures: study case Sisseb El Alem basin, center Tunisia 重力建模与地震解释识别深部构造：以突尼斯中部Sisseb El Alem盆地为例

IF 2.6 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2026-06-29 DOI: 10.1007/s40328-026-00506-4

Mohamed Atawa, Faten Houatmia, Ali Bennour, Abdessattar Hamdi, Mohamed Gasmi

引用次数: 0

A geophysical investigation for detection of a buried fault under the volcanic cover, Eastern Anatolia-Türkiye 在东安纳托利亚- <s:1>基耶火山覆盖下探测隐伏断层的地球物理调查

IF 2.6 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2026-06-17 DOI: 10.1007/s40328-026-00507-3

Attila Aydemir

{"title":"A geophysical investigation for detection of a buried fault under the volcanic cover, Eastern Anatolia-Türkiye","authors":"Attila Aydemir","doi":"10.1007/s40328-026-00507-3","DOIUrl":"10.1007/s40328-026-00507-3","url":null,"abstract":"<div><p>The Van Gölü Fault was recently identified after the occurrence of two devastating earthquakes in the district of Van, Eastern Anatolia, Türkiye. This significant fault has not been included in the literature because of large volcanic cover in this region. The aforementioned earthquakes have stimulated geological and geophysical surveys around Lake Van, despite the limited amount of seismic, borehole and sedimentological data. There are apparent, E–W trending magnetic anomalies along a slightly curved line crossing the northern part of the lake (indicating the existence of a fault). The main goal of this study was to display the location of this fault using various data processing methods for aeromagnetic anomalies. Based on these processes, the first and second derivatives, analytic signal, total horizontal derivative, tilt, and theta angle maps were constructed to clearly indicate the fault. Considering the geographical location of the fault, it is named as the “Van Gölü Fault” in this study. The Nemrut and Süphan volcanic mountains together with the strong magnetic anomalies to the east of Lake Van are all aligned on the Van Gölü Fault trend and they likely originated from the magmatic-volcanic emplacements related to this recently reactivated fault.</p></div>","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":"61 3","pages":"601 - 618"},"PeriodicalIF":2.6,"publicationDate":"2026-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965319","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

Perturbation of the geomagnetic field over the coastal land area caused by a tsunami wave 海啸波引起的沿海陆地上地磁场的扰动

IF 2.6 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2026-06-16 DOI: 10.1007/s40328-026-00509-1

V. M. Sorokin, V. V. Surkov, A. K. Yashchenko

{"title":"Perturbation of the geomagnetic field over the coastal land area caused by a tsunami wave","authors":"V. M. Sorokin, V. V. Surkov, A. K. Yashchenko","doi":"10.1007/s40328-026-00509-1","DOIUrl":"10.1007/s40328-026-00509-1","url":null,"abstract":"<div><p>The generation mechanism for the geomagnetic field perturbation caused by a tsunami wave over land in a coastal region is studied. The sources of perturbation are electric currents in the marine environment and in the ionosphere. The current in conducting seawater arises as a result of its movement in the geomagnetic field during the propagation of a tsunami wave. The current in the ionosphere is caused by the movement of ionospheric plasma under the action of an acoustic-gravity wave radiated into the atmosphere due to the vertical displacement of the seawater surface in a tsunami wave. A model has been constructed describing geomagnetic disturbances caused by a tsunami wave and an acoustic-gravity wave, including the decay of a tsunami wave when the wave front reaches the coastline. The model makes it possible to explain the propagation of geomagnetic perturbations on land over long distances from the coastline. Based on this model, geomagnetic perturbations are calculated depending on time and distance to the coastline. The effects produced by currents in the marine environment and ionosphere are compared.</p></div>","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":"61 3","pages":"619 - 632"},"PeriodicalIF":2.6,"publicationDate":"2026-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965428","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

A cooperative seismic-oriented magnetotelluric data inversion, a tool for hydrocarbon reservoir imaging 地震定向大地电磁资料协同反演——油气藏成像工具

IF 2.6 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2026-06-16 DOI: 10.1007/s40328-026-00505-5

Saeed Ghanbarifar, Seyed Hossein Hosseini, Saeed Rahmati, Maysam Abedi

{"title":"A cooperative seismic-oriented magnetotelluric data inversion, a tool for hydrocarbon reservoir imaging","authors":"Saeed Ghanbarifar, Seyed Hossein Hosseini, Saeed Rahmati, Maysam Abedi","doi":"10.1007/s40328-026-00505-5","DOIUrl":"10.1007/s40328-026-00505-5","url":null,"abstract":"<div><p>Hydrocarbon reservoir imaging plays a crucial role in the oil and gas exploration industry. Seismic data processing is commonly employed as the primary imaging tool, but interpreting the data in complex geological settings can present challenges. To supplement seismic imaging, magnetotelluric (MT) data offers valuable information on the electrical conductivity of subsurface structures. MT data is highly effective for differentiating the components of a hydrocarbon system characterized by varying resistivity and boundaries; however, it encounters challenges in thinly layered formations, which are often easier to identify through seismic data. In these contexts, the unconstrained inversion of MT data is inherently non-unique. There has been a growing interest in enhancing hydrocarbon reservoir imaging through the cooperative inversion of seismic and MT data which combines information from multiple methods to improve the estimation of subsurface rock properties. To implement this approach, seismic reverse time migration (RTM) result is first utilized to establish appropriate initial boundaries for the MT sharp boundary inversion scheme, resulting in robust and reliable MT seismic-oriented modeling outcomes. To illustrate the feasibility of using seismic imaging techniques as constraints for the MT sharp boundary inversion, synthetic hydrocarbon trapping systems are simulated and investigated to disclose the efficiency of the proposed method.</p></div>","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":"61 3","pages":"555 - 580"},"PeriodicalIF":2.6,"publicationDate":"2026-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965429","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

Advances in hardware and constructions in geomagnetic observatory measurements and practice in Russia and the near abroad 俄罗斯及周边国家地磁观测站测量与实践的硬件和建设进展

IF 2.6 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2026-06-05 DOI: 10.1007/s40328-026-00503-7

Roman Sidorov, Dmitry Kudin, Ilya Ryakhovsky, Pavel Borodin, Mikhail Prikop, Vladimir Sapunov, Jon Karapetyan, Valijon Yusupov

引用次数: 0

Impact of using artificial neural networks on the accuracy of hybrid geoid model: a case study in a mountainous area 人工神经网络对混合大地水准面模型精度的影响——以某山区为例

IF 2.6 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2026-06-05 DOI: 10.1007/s40328-026-00502-8

Yasar Fidanci, Ramazan Alpay Abbak

引用次数: 0

Pre- and post-seismic stress-fluid coupling revealed by b-value and GRACE-derived EWH anomalies: insights from the 2012 Ahar–Varzaghan doublet earthquakes, northwest Iran 由b值和grace衍生的EWH异常揭示的震前和震后应力-流体耦合：来自伊朗西北部2012年Ahar-Varzaghan双重地震的启示

IF 2.6 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2026-06-05 DOI: 10.1007/s40328-026-00504-6

Muhammed Hossein Mousavi, Amir Talebi

{"title":"Pre- and post-seismic stress-fluid coupling revealed by b-value and GRACE-derived EWH anomalies: insights from the 2012 Ahar–Varzaghan doublet earthquakes, northwest Iran","authors":"Muhammed Hossein Mousavi, Amir Talebi","doi":"10.1007/s40328-026-00504-6","DOIUrl":"10.1007/s40328-026-00504-6","url":null,"abstract":"<div><p>The Ahar–Varzaghan doublet earthquakes (Mw 6.4 and Mw 6.2) in northwestern Iran offer a unique natural laboratory for examining the interplay between seismotectonic processes and hydrological variations across an entire seismic cycle. In this study, we integrate high-resolution spatiotemporal analyses of b-value derived from the Iranian Seismological Center catalog with GRACE Equivalent Water Height (EWH) observations (2006–2024) to assess stress–fluid interactions before and after the mainshock. The pre-seismic stage is characterized by a steady decline in b-value from approximately 0.85 to 0.55 over the 3 years leading up to the event, reflecting increasing differential stress and progressive fault locking. During the same interval, cumulative EWH anomalies exhibit a pronounced mass deficit, reaching approximately − 27 cm and peaking 2–6 months before rupture. This negative anomaly is consistent with poroelastic compaction or fluid withdrawal driven by compressive loading in the near-field of the impending rupture. Following the mainshock, the system evolves in the opposite manner: b-value sharply increases to 0.72–1.02 within 1 year, forming a high b-value zone (> 0.9) surrounding the rupture area, indicative of stress release and widespread microfracturing. In contrast, EWH anomalies remain strongly negative, reaching approximately − 20 cm in the epicentral region, suggesting that fluid drainage persists despite the enhanced fracture permeability generated by the earthquakes. This sustained inverse relationship between b-value and EWH anomalies implies a decoupling between mechanical recovery and hydrological re-equilibration. The results highlight the complementary roles of these parameters: b-value effectively captures short-term stress evolution, whereas EWH anomalies reflect longer-term mass redistribution.</p></div>","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":"61 3","pages":"535 - 553"},"PeriodicalIF":2.6,"publicationDate":"2026-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965261","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

Detection of the Goaf in Xinchang Coal Mine and its impact on Hangzhou–Shaoxing–Taizhou high-speed railway 新昌煤矿采空区探测及其对杭绍泰高铁的影响

IF 2.6 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2026-05-08 DOI: 10.1007/s40328-026-00500-w

Yuancheng Zhao, Xing Mao, Baochun Li, Ji’en Dong, Shilei Song, Peng Sun

{"title":"Detection of the Goaf in Xinchang Coal Mine and its impact on Hangzhou–Shaoxing–Taizhou high-speed railway","authors":"Yuancheng Zhao, Xing Mao, Baochun Li, Ji’en Dong, Shilei Song, Peng Sun","doi":"10.1007/s40328-026-00500-w","DOIUrl":"10.1007/s40328-026-00500-w","url":null,"abstract":"<div><p>The Hangzhou–Shaoxing–Taizhou high-speed railway passes below the Xinchang Coal Mine, where the goaf is deeply buried. To scientifically evaluate the impact of the Xinchang Coal Mine goaf on the under-construction Hangzhou–Shaoxing–Taizhou high-speed railway and ensure the safety of engineering construction and railway operation, a comprehensive investigation of the Xinchang Coal Mine goaf was carried out using a combined method of geological survey, drilling, and geophysical exploration. Ground surveys identified two adit entrances (P1, P2) and a mine ventilation shaft (S1). Five transient electromagnetic (TEM) survey lines were arranged above the coal mine with a point spacing of 5 m. The TEM data were finely processed, and the inversion parameters were verified. Borehole verification was conducted to validate the inferred abnormal areas, ensuring reliable results. A total of 18 goaf anomalies were identified. Among them, anomalies C1, C5, C8, and C11 are close to the tunnel, anomaly C16 is located directly above the tunnel, and the remaining anomalies are situated farther away from the tunnel. No water inflow was detected by either geophysical exploration or drilling, confirming the absence of mine water. Finally, the stability of the goaf was evaluated. Calculation and analysis indicate that the duration of surface movement in the goaf was shorter than the mine’s operation period, with a maximum subsidence of approximately 3.99 m in the surface deformation zone. The coal mine goaf is located 39 m above the tunnel roof, which is greater than the tunnel’s safe roof thickness of 8.88 m. Additionally, the tunnel surrounding rock is dense basalt with relatively intact rock mass. It is concluded that the Xinchang Coal Mine goaf has a relatively minor impact on the Hangzhou–Shaoxing–Taizhou high-speed railway.</p></div>","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":"61 3","pages":"437 - 457"},"PeriodicalIF":2.6,"publicationDate":"2026-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965374","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