pure and applied geophysics最新文献_第10页

Estimation of Hazard-Dominating Scenario in Seismic Demand Analysis 地震需求分析中灾害主导情景的估计

IF 1.9 4区地球科学

pure and applied geophysics Pub Date : 2025-02-13 DOI: 10.1007/s00024-025-03672-8

Mohammad-Rashid Salimi, Azad Yazdani

{"title":"Estimation of Hazard-Dominating Scenario in Seismic Demand Analysis","authors":"Mohammad-Rashid Salimi, Azad Yazdani","doi":"10.1007/s00024-025-03672-8","DOIUrl":"10.1007/s00024-025-03672-8","url":null,"abstract":"<div><p>This study presents an innovative approach to enhance performance-based earthquake engineering (PBEE) by combining reliability-based methods with seismic hazard disaggregation. PBEE aims to reduce damage and losses in structures subjected to stochastic excitations, such as earthquakes and wind turbulence. Unlike conventional probabilistic seismic hazard disaggregation, which may not fully address structural performance requirements, this approach focuses on disaggregating seismic demand within the Probabilistic Seismic Demand Analysis (PSDA) framework, making it a vital component of seismic risk analysis. This involves identifying the ground motion intensity measures contributing to specific structural response levels. The proposed methodology combines stochastic ground motion modeling with random vibration theory to estimate the failure probability of both linear and nonlinear systems under various seismic scenarios characterized by magnitude (<i>M</i>) and distance (<i>R</i>). Compared to traditional approaches requiring extensive record scaling and nonlinear time history analysis, this method leverages simulated excitations, offering significant computational efficiency. Results show that failure probability for linear systems remains relatively constant across scenarios, whereas nonlinear systems exhibit a strong dependence on the selected scenario, highlighting their sensitivity to varying seismic inputs. This research emphasizes the critical role of scenario selection in seismic demand analysis and introduces three cases—modal, worst, and weighted scenarios—for estimating failure probabilities. The findings provide practical insights for seismic risk assessment and structural design optimization, particularly in regions with sparse recorded ground motion data. This framework offers an efficient and robust solution for advancing PBEE practices in seismic engineering.</p></div>","PeriodicalId":21078,"journal":{"name":"pure and applied geophysics","volume":"182 2","pages":"473 - 489"},"PeriodicalIF":1.9,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638222","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

Feasibility of Utilizing Continuous Records from Weak And Strong-Motion Recorder Channels of Permanent Stations for Horizontal To Vertical Spectral Ratio (HVSR) Analysis During Calm-Day Conditions 平日条件下利用固定站弱运动和强运动记录通道连续记录进行水平与垂直谱比分析的可行性

IF 1.9 4区地球科学

pure and applied geophysics Pub Date : 2025-02-12 DOI: 10.1007/s00024-025-03669-3

Mustafa Senkaya

{"title":"Feasibility of Utilizing Continuous Records from Weak And Strong-Motion Recorder Channels of Permanent Stations for Horizontal To Vertical Spectral Ratio (HVSR) Analysis During Calm-Day Conditions","authors":"Mustafa Senkaya","doi":"10.1007/s00024-025-03669-3","DOIUrl":"10.1007/s00024-025-03669-3","url":null,"abstract":"<div><p>The proposed paper assesses the feasibility of using continuous records acquired from weak and strong-motion recorder channels of permanent earthquake observation stations under calm-day conditions for the HVSR method. The analyses were conducted on 60 tri-axial ambient noise data through HN channels from strong-motion recorders and BH, HH (or EH) channels from weak-motion recorders from 25 stations belonging to various soil and topography classes in the INGV network of Italy. The accuracy and reliability of the proposed HVSR curves were evaluated by benchmarking them with predefined original HVSR curves for each station, using statistical metrics such as the Pearson correlation coefficient and mean absolute error (MAE). The findings demonstrate that weak-motion recorder channels, especially HH and EH, acquire ambient noise, which serves as the primary data for the HVSR method, with higher PSD levels than strong-motion channels due to their inherently lower self-noise threshold. Therefore, while HVSR curves derived through BH channels indicate an average correlation of 84% and MAE of 12%, HH-EH channels demonstrate 91% and %12, respectively. Conversely, HN channels exhibit lower correlation (28%) and higher MAE (31%). Furthermore, topography and soil class influence PSD values, with T1 and C classes exhibiting the highest levels. However, variations in performance across different topographic and soil classes are less pronounced. The analyses suggest that the channel type plays a more critical role in HVSR analysis. This finding highlights the importance of selecting the appropriate channel for accurate HVSR analysis using permanent stations.</p></div>","PeriodicalId":21078,"journal":{"name":"pure and applied geophysics","volume":"182 2","pages":"537 - 555"},"PeriodicalIF":1.9,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00024-025-03669-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638136","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

Integrating Airborne Geophysics Data for Geological Mapping and Porphyry Mineralization Prospectivity in the Shahr-e-Babak Area, Southeastern Iran 伊朗东南部Shahr-e-Babak地区整合航空地球物理数据进行地质填图和斑岩成矿找矿

IF 1.9 4区地球科学

pure and applied geophysics Pub Date : 2025-02-11 DOI: 10.1007/s00024-024-03627-5

Moslem Jahantigh, Hamidreza Ramazi

{"title":"Integrating Airborne Geophysics Data for Geological Mapping and Porphyry Mineralization Prospectivity in the Shahr-e-Babak Area, Southeastern Iran","authors":"Moslem Jahantigh, Hamidreza Ramazi","doi":"10.1007/s00024-024-03627-5","DOIUrl":"10.1007/s00024-024-03627-5","url":null,"abstract":"<div><p>This paper is devoted to application of airborne geophysical data consisting of aeromagnetic and radiometric data to interpret the geology, lineament structures, high magnetic anomalies, and high favorability areas of porphyry mineralization in the Shahr-e-Babak study area. The maps of reduction to magnetic pole, potassium, thorium, uranium, ternary map of potassium, thorium, and uranium radioelements were used for geological interpretation in the study area. The ratio of K/Th, tilt angle, fractal and fuzzy logic methods were also applied to interpret geophysical data. To identify alteration zones in the area, arithmetic ratio of the K/Th map was used. The fractal method was used to delineate high magnetic anomalies and highly altered zones. The high magnetic anomalies could be coincident with heat sources of porphyry deposits. To identify linear structures tilt derivative method was applied. These linear structures are appropriate for hydrothermal fluid circulation and porphyry mineralization in the area. Some constrain magnetic anomalies were identified based on geological interpretation of aeromagnetic data. Cu indices were consistent with high magnetic anomalies. Based on geological interpretation of airborne radiometric data, volcanic and subvolcanic rocks reflect high radiometric anomalies while sedimentary rocks reflect low radiometric anomalies. Altered areas were extracted using airborne radiometric data and the fractal method. Lineaments were extracted from the tilt derivative map and this map was utilized for compiling density map of linear structures. The Cu indices showed an appropriate overlay with the line density map. In the final stage, three evidential layers including linear structures, high magnetic anomalies, and alteration zone resulting from the K/Th anomaly map were integrated to delineate high potential areas, by applying the fuzzy logic method.</p></div>","PeriodicalId":21078,"journal":{"name":"pure and applied geophysics","volume":"182 4","pages":"1637 - 1656"},"PeriodicalIF":1.9,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143883626","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

Lithospheric Imaging in the West African Craton Using Receiver Function Modelling 西非克拉通岩石圈成像的接收函数模拟

IF 1.9 4区地球科学

pure and applied geophysics Pub Date : 2025-02-08 DOI: 10.1007/s00024-025-03668-4

Swati Sharma, Alolika Chakraborty, Kajaljyoti Borah

{"title":"Lithospheric Imaging in the West African Craton Using Receiver Function Modelling","authors":"Swati Sharma, Alolika Chakraborty, Kajaljyoti Borah","doi":"10.1007/s00024-025-03668-4","DOIUrl":"10.1007/s00024-025-03668-4","url":null,"abstract":"<div><p>The lithospheric structure beneath the west African craton (WAC) is presented in this study to understand the oldest parts of the continent. The shear velocity structure, associated composition (felsic/intermediate/mafic) and nature of crust transition (sharp or flat) at depth provide the link between the age these oldest parts of the continents formed and reworked in, formulating models of their evolution. This study estimates the crust and uppermost mantle velocity structure using joint inversion of the Rayleigh wave group velocity dispersion and receiver functions data calculated from 8 broadband seismic stations. The results show a significant variation of crustal properties in the Precambrian WAC. The shear wave velocity (Vs) at depth reveals a 42–47 km thick crust of felsic-to-intermediate composition near the boundary of the Precambrian old lithosphere and ~ 39 km thick felsic crust in the cratonic interior. The thick crust near the margins is also synchronous with a thick (~ 10–21 km) lower crust layer with high Vs (4.0–4.3 km/s). Contrarily, the thin crust accommodates a thin (~ 4–6 km) high Vs lower crust layer in the cratonic interior. This high Vs layer is often interpreted as the laminated base of the crust, providing insight into the thickness of the Precambrian lithosphere. Its presence as a thick layer at the base in the Proterozoic crust, or its absence (or thinning) in the Archean crust, is linked with the evolution of the continents. This high-velocity base is dissolved, reworked and delaminated over time, forming a thin felsic stabilised crust. We also observed higher uppermost mantle Vs in WAC, similar to the other Precambrian cratons (≥ 4.5 km/s).</p></div>","PeriodicalId":21078,"journal":{"name":"pure and applied geophysics","volume":"182 4","pages":"1525 - 1544"},"PeriodicalIF":1.9,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143883620","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

Role of Moisture on Rapid Intensification of the Super Cyclone Amphan (2020) Under Different Ocean Surface Forcings Over the Bay of Bengal 孟加拉湾不同海面强迫下水汽对超级气旋安潘（2020）快速增强的影响

IF 1.9 4区地球科学

pure and applied geophysics Pub Date : 2025-02-07 DOI: 10.1007/s00024-025-03664-8

Vijay Vishwakarma, Sandeep Pattnaik

{"title":"Role of Moisture on Rapid Intensification of the Super Cyclone Amphan (2020) Under Different Ocean Surface Forcings Over the Bay of Bengal","authors":"Vijay Vishwakarma, Sandeep Pattnaik","doi":"10.1007/s00024-025-03664-8","DOIUrl":"10.1007/s00024-025-03664-8","url":null,"abstract":"<div><p>The present study examines the moisture regulation and its impact on the energetics and rapid intensification (RI) phases of a super cyclone (SuCS) Amphan (2020) over the Bay of Bengal. Surface ocean forcing in terms of sea surface temperature (SST) is utilized from two operational models (HYCOM and NEMO) to simulate the Amphan using the Weather Research and Forecasting (WRF) model during 0000 UTC 16–20 May 2020. Three numerical experiments (CNT, NEM, and HYC) were conducted with Global Forecast System (GFS) initial conditions at 9 km and 3 km resolutions. The results show that strong lower-level moisture supports enhanced vertical updrafts in CNT and NEM, leading to overestimated intensification of RI and SuCS phases compared to HYC. Further, moisture budget analysis reveals increased moisture advection and flux convergence resulting in vigorous precipitation in CNT and NEM than HYC. Further, energetics analysis depicts the steepest accumulation of latent and kinetic energy in CNT, followed by NEM and HYC. In contrast, the moderately moist HYC exhibits realistic energy regulation during the RI, SuCS, and post-SuCS phases compared to CNT and NEM. This is noted to be driven by moderate vertical updrafts in HYC that enable accurate moisture advection and its regulation during RI and SuCS phases. In totality, the realistic moisture regulation in HYC is linked to the mid-level overturning circulation (500–300 hPa) and diabatic heating specifically during the post-SuCS phase, which is not attained by CNT and NEM. These findings have direct implications for operational forecasting and disaster management, aiding readiness and policy formulation.</p></div>","PeriodicalId":21078,"journal":{"name":"pure and applied geophysics","volume":"182 2","pages":"929 - 951"},"PeriodicalIF":1.9,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638481","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

Correlation Between Fault Movement and Seismic Activity in Northern Tibetan-Plateau: a Case Study from Numerical Simulation 青藏高原北部断层运动与地震活动的相关性——以数值模拟为例

IF 1.9 4区地球科学

pure and applied geophysics Pub Date : 2025-02-07 DOI: 10.1007/s00024-025-03663-9

Yuan Li, Xia Liu, Xikang Liu, Yanqiang Wu, Wei Zhan, Zheng Tang

{"title":"Correlation Between Fault Movement and Seismic Activity in Northern Tibetan-Plateau: a Case Study from Numerical Simulation","authors":"Yuan Li, Xia Liu, Xikang Liu, Yanqiang Wu, Wei Zhan, Zheng Tang","doi":"10.1007/s00024-025-03663-9","DOIUrl":"10.1007/s00024-025-03663-9","url":null,"abstract":"<div><p>In the northern Qinghai-Tibet Plateau, active areas of Ms ≥ 6 earthquakes are mostly located on special tectonic parts of faults, for instance fault bends. The frequent occurrence of strong earthquakes in local regions is inevitably related to the morphology of the faults themselves, the long-term state of fault motion and the accumulation of stress. Previous studies of their interrelationships have mostly been based on ideal or simple fault models. We developed a three-dimensional viscoelastic finite element model with a refined geometry of major faults to calculate long-term steady-state fault slip rates, fault stress accumulation rates and regional stress fields in this region, using GPS velocity data as boundary conditions. The kinematic and stress characteristics of the fault bend parts and the dynamical background of the strong seismic activity in these parts are discussed. The results indicate that active areas of moderate-strong earthquakes have a background of high stress accumulation. The slip rate and stress accumulation rate of faults are non-uniform along the fault strike. Stress accumulation rates are high at fault bends with moderate-strong seismic activity, but slip rates tend to be low at bends or differ significantly between fault segments on either side of the bends, suggesting that movement between different fault segments is not coordinated. Meanwhile, the maximum shear stress results show that the shear stress accumulation rate is higher in the active region of strong earthquakes. The high stress accumulation on and near the seismogenic fault and uncoordinated movements between adjacent fault segments are important dynamic factors that cause moderate-strong earthquakes to cluster on and near the bends. Therefore, special tectonic parts such as fault bends are effective in controlling the slip rate, stress accumulation and seismicity of faults, which are potential seismogenic areas of strong earthquakes.</p></div>","PeriodicalId":21078,"journal":{"name":"pure and applied geophysics","volume":"182 2","pages":"419 - 438"},"PeriodicalIF":1.9,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638476","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

Assessment of Surface PM2.5 Concentrations over India using Modern-Era Retrospective Analysis for Research and Applications, Version 2 (MERRA-2) Reanalysis Data 使用现代研究与应用回顾性分析第2版（MERRA-2）再分析数据评估印度地表PM2.5浓度

IF 1.9 4区地球科学

pure and applied geophysics Pub Date : 2025-02-06 DOI: 10.1007/s00024-025-03666-6

Sumit Singh, Amarendra Singh, Atul Kumar Srivastava, Virendra Pathak, Ajay Kumar, Vivek Singh

{"title":"Assessment of Surface PM2.5 Concentrations over India using Modern-Era Retrospective Analysis for Research and Applications, Version 2 (MERRA-2) Reanalysis Data","authors":"Sumit Singh, Amarendra Singh, Atul Kumar Srivastava, Virendra Pathak, Ajay Kumar, Vivek Singh","doi":"10.1007/s00024-025-03666-6","DOIUrl":"10.1007/s00024-025-03666-6","url":null,"abstract":"<div><p>Particulate matters with a diameter of 2.5 μm or smaller (i.e. PM<sub>2.5</sub>) are critical component of air pollution that has significant impacts on human health and the environment. The study underscores the utilization of the Modern-Era Retrospective Analysis for Research and Applications, Version 2 (MERRA-2) reanalysis data to evaluate surface PM<sub>2.5</sub> concentrations as well as its sub-species across India during the period from 2018 to 2021. MERRA-2 and ground-based AERONET-derived Aerosol Optical Depth (AOD) over Kanpur, Jaipur, Pune, and Delhi shows a significant correlation of 0.70, 0.74, 0.82 and 0.65, respectively. The study also reveals a complex relationship between PM<sub>2.5</sub> and its sub-species with the meteorological factors, which was found to vary seasonally, specifically, during the winter season. The Indo-Gangetic Plains (IGP) experiences pronounced seasonal variations, with peak concentrations in winter and post-monsoon seasons. This study also explores the impact of India's COVID-19 lockdown on air quality, revealing a consistent reduction in PM<sub>2.5</sub> and its sub-species during different lockdown phases in 2020 compared to previous and subsequent years. By leveraging high-resolution atmospheric data, this research advances our understanding of pollution patterns, sources, and trends, offering valuable insights for air quality management and policy formulation.</p></div>","PeriodicalId":21078,"journal":{"name":"pure and applied geophysics","volume":"182 4","pages":"1713 - 1735"},"PeriodicalIF":1.9,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143883600","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

The Use of Gravity Gradient Tensor Eigenvectors to Recover the Basic Geometric Properties of 2D Density Boundaries 利用重力梯度张量特征向量恢复二维密度边界的基本几何特性

IF 1.9 4区地球科学

pure and applied geophysics Pub Date : 2025-02-06 DOI: 10.1007/s00024-025-03667-5

Roman Beránek, Jan Mrlina

{"title":"The Use of Gravity Gradient Tensor Eigenvectors to Recover the Basic Geometric Properties of 2D Density Boundaries","authors":"Roman Beránek, Jan Mrlina","doi":"10.1007/s00024-025-03667-5","DOIUrl":"10.1007/s00024-025-03667-5","url":null,"abstract":"<div><p>Many geological structures such as faults, calderas, large intrusions, etc. can be approximated by a density boundary model that can be characterised by dip, edge position, depth and density contrast. Gravity gradiometry is a geophysical method that can be used to investigate some of the properties of such geological structures. In this study, we have tested a method for estimating the slope of the density boundary based on analysing the inclination angles of the gravity gradient tensor eigenvectors above the edge of the contact. We also introduced a new edge detection technique that uses the rate of change of the eigenvectors of the gravity gradient tensor. We found that the dip angle of a density boundary cannot be derived directly from the inclinations of the eigenvectors above the contact. On the other hand, we have found that the edge position given by the maximum rate of change of the eigenvector inclinations works better than the vertical and horizontal gradient methods in case the measurements are performed at a considerable height above the boundary. This new edge detection method may therefore be suitable for aerial gravity gradiometry data interpretation.</p></div>","PeriodicalId":21078,"journal":{"name":"pure and applied geophysics","volume":"182 2","pages":"557 - 569"},"PeriodicalIF":1.9,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638342","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

Imaging Mofette Structures in the Ohře Rift System, Czech Republic, Using Radio-Magnetotelluric Data 利用射电磁法数据成像捷克共和国奥热裂谷系统中的莫菲特结构

IF 1.9 4区地球科学

pure and applied geophysics Pub Date : 2025-02-03 DOI: 10.1007/s00024-025-03665-7

Paula Rulff, Ute Weckmann, Thomas Kalscheuer, Gregor Willkommen, Laura Maria Buntin, Anna Platz

{"title":"Imaging Mofette Structures in the Ohře Rift System, Czech Republic, Using Radio-Magnetotelluric Data","authors":"Paula Rulff, Ute Weckmann, Thomas Kalscheuer, Gregor Willkommen, Laura Maria Buntin, Anna Platz","doi":"10.1007/s00024-025-03665-7","DOIUrl":"10.1007/s00024-025-03665-7","url":null,"abstract":"<div><p>The pathways of fluids and mantle-originated carbon dioxide in the seismically active Ohře (Eger) Rift system appearing as mofettes at the surface are currently subject to investigation, especially by the International Continental Scientific Drilling Program “Drilling the Eger Rift”. If the aquifers show significant contrast in electrical resistivity to the host rocks, they can be investigated with geo-electromagnetic methods. However, imaging complex fluid and CO<sub>2</sub> pathways in detail in near-surface structures is challenging, because, in contrast to the background stratigraphy, they are often oriented in near-vertical directions. Therefore, we aim to investigate how the shallow aquifer structures can be examined best with an inductive electromagnetic method. For this purpose, we collected radio-magnetotelluric data in the Hartoušov mofette field and evaluated them by two- and three-dimensional inversions. Data from a nearby magnetotelluric station, drill hole data, gas flux measurements and electrical resistivity tomography models were used to assess the reliability and robustness of our inversion results. We concluded that the near-surface fluid reservoirs are adequately depictable, while the migration paths of gaseous CO<sub>2</sub> cannot be traced properly due to a lack of resistivity contrast. Our model analyses suggest that imaging the given geological setting with fluids and gases ascending in anastomosing pathways benefits from a fine-scale three-dimensional inversion approach because the fluids mostly appear as local conductive reservoir-like anomalies, which can be falsely projected onto the profiles during inversion in two dimensions. The resistivity models contribute with detailed images of the near-surface aquifers to the geodynamic model of the Ohře Rift.</p></div>","PeriodicalId":21078,"journal":{"name":"pure and applied geophysics","volume":"182 2","pages":"609 - 636"},"PeriodicalIF":1.9,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00024-025-03665-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638266","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

ANN-Based Ground Motion and Physics-Based Broadband Models for Vertical Spectra 基于人工神经网络的地面运动和基于物理的垂直光谱宽带模型

IF 1.9 4区地球科学

pure and applied geophysics Pub Date : 2025-02-01 DOI: 10.1007/s00024-025-03660-y

Varun Sharma, Harsh Kumar Arya Author, Maheshreddy Gade, J. Dhanya

{"title":"ANN-Based Ground Motion and Physics-Based Broadband Models for Vertical Spectra","authors":"Varun Sharma, Harsh Kumar Arya Author, Maheshreddy Gade, J. Dhanya","doi":"10.1007/s00024-025-03660-y","DOIUrl":"10.1007/s00024-025-03660-y","url":null,"abstract":"<div><p>This study proposes a new simplified Ground Motion Model (GMM) for vertical spectra by combining comprehensive datasets from the NESS and NGA-West2 databases. The proposed Artificial Neural Network (ANN) architecture-based model requires only 288 unknowns to predict spectral accelerations (<i>Sa</i>) at 33 distinct periods ranging from 0 to 4 s. Notably, this model inherently captures known physical phenomena with reduced variability using a minimum number of unknowns compared to the GMMs existing literature, thus offering a valuable addition to current hazard estimation frameworks. Furthermore, recognizing the necessity for physics-based simulations in vertical ground motion analysis, we introduce a physics-based broadband model for vertical spectra using ANN methodology. The proposed broadband model exhibits better robustness due to the comprehensiveness of the dataset utilized and the inclusion of source path and site characteristics at the input layer. Additionally, the model effectively captures the physical trends with minimal deviation. Further, we verified the predictive ability of the developed models through a comprehensive case study of the 2008 Iwate–Miyagi earthquake. The proposed models serve as essential tools for physics-based broadband simulations and hazard assessments in active shallow crustal regions.</p></div>","PeriodicalId":21078,"journal":{"name":"pure and applied geophysics","volume":"182 2","pages":"637 - 665"},"PeriodicalIF":1.9,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638128","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