pure and applied geophysics最新文献_第3页

3D Joint Inversion of Borehole, Surface, and Airborne Magnetic Anomaly 井、地、空磁异常三维联合反演

IF 1.9 4区地球科学

pure and applied geophysics Pub Date : 2025-02-15 DOI: 10.1007/s00024-025-03675-5

Ke Shi, Shuang Liu, Xiange Jian, Feng Xu, Youping Mao, Xianxin Liu

{"title":"3D Joint Inversion of Borehole, Surface, and Airborne Magnetic Anomaly","authors":"Ke Shi, Shuang Liu, Xiange Jian, Feng Xu, Youping Mao, Xianxin Liu","doi":"10.1007/s00024-025-03675-5","DOIUrl":"10.1007/s00024-025-03675-5","url":null,"abstract":"<div><p>The surface magnetic anomaly provides excellent horizontal resolution, the three-component borehole magnetic anomaly offers excellent vertical resolution, and the aeromagnetic anomaly contains valuable information about deeper and larger magnetic sources. The advantages features of the three types of data can be combined to improve inversion resolution and reduce the nonuniqueness through the joint inversion. Currently, research primarily focuses on borehole–surface joint inversion, with the aeromagnetic anomaly seldom integrated into the joint inversion system, resulting in underutilization of its rich information. Furthermore, existing research findings on borehole–surface joint inversion primarily offer qualitative insights into the improvement in vertical resolution due to borehole magnetic anomalies. However, further investigation is required to understand the varying degrees of improvement brought about by different borehole quantities, positions, and distributions. To fully exploit the advantages of the three data and achieve higher inversion resolution, we propose a 3D joint inversion algorithm incorporating borehole, surface, and airborne magnetic anomalies. Through synthetic model experiments, we initially assess the actual enhancement brought by the aeromagnetic anomaly on inversion quality and discover effective ways to leverage its advantages. Subsequently, we investigate the degree of improvement in inversion quality resulting from different combinations of boreholes, summarizing optimal borehole selection methods. Finally, we apply the algorithm to a real mining area, validating its practicality by comparing the inversion results with drilled rock cores. Our research indicates that the proposed method yields inversion results with both high horizontal and vertical resolution, faithfully representing the physical properties of shallow-small and deep-large magnetic sources.</p></div>","PeriodicalId":21078,"journal":{"name":"pure and applied geophysics","volume":"182 4","pages":"1489 - 1511"},"PeriodicalIF":1.9,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143883686","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

Installation, Calibration, and Data Processing of the Superconducting Gravimeter at the New Deep Underground Lab in Korea 韩国新深地下实验室超导重力仪的安装、校准和数据处理

IF 1.9 4区地球科学

pure and applied geophysics Pub Date : 2025-02-15 DOI: 10.1007/s00024-025-03674-6

Mohammad Javad Dehghan, Edwin J. Son, Ik Woo, Hwansun Kim, SeungMi You, John J. Oh, JeongCho Kim, Ankhtsetseg Dorjsuren, Jeong Woo Kim

{"title":"Installation, Calibration, and Data Processing of the Superconducting Gravimeter at the New Deep Underground Lab in Korea","authors":"Mohammad Javad Dehghan, Edwin J. Son, Ik Woo, Hwansun Kim, SeungMi You, John J. Oh, JeongCho Kim, Ankhtsetseg Dorjsuren, Jeong Woo Kim","doi":"10.1007/s00024-025-03674-6","DOIUrl":"10.1007/s00024-025-03674-6","url":null,"abstract":"<div><p>Installation, operation, and preliminary analysis of the superconducting gravimeter at the underground Yemi laboratory are presented. In October 2022, a superconducting gravimeter, <i>i</i>Grav#001, was installed at the Yemi laboratory in Korea, located ~ 1008 m below the surface and 118 m below the mean sea level. The ultimate objective of the project is to monitor and analyze earthquake signals to enhance the current early warning systems. The noise analysis revealed that the noise level at YemiLab, particularly within the seismic band, is significantly low and close to the New Low Noise Model. It was found that blasting for mining at least 700 m away from the SG was recorded in the dewar and barometer pressures as well as tilt balance data. However, no effect was recorded in the raw SG data, indicating that the blasting vibration was compensated by the SG tilt system. Through five days of parallel measurements with an FG5 absolute gravimeter, a calibration factor of – 94.38 μGal∙V<sup>−1</sup> was estimated. Residual gravity was calculated after removing environmental effects. The spectral analysis reveals several unknown frequencies in the power spectrum density of the residual gravity, which require additional analyses. Co-seismic gravity changes were investigated for an earthquake with 6.2 Mw and 765 km away from the SG station to investigate the sensitivity and capability of the SG for earthquake monitoring. The recorded gravity changes at the arrival time were 0.561 μGal, which gradually decreased and disappeared within half an hour after the first arrival at the SG.</p></div>","PeriodicalId":21078,"journal":{"name":"pure and applied geophysics","volume":"182 4","pages":"1545 - 1562"},"PeriodicalIF":1.9,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143883685","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

Surface Wave Numerical Simulation and Characteristics Analysis Considering the Effect of Sea Ice in the Bohai Sea, China 考虑海冰影响的渤海表面波数值模拟及特征分析

IF 1.9 4区地球科学

pure and applied geophysics Pub Date : 2025-02-14 DOI: 10.1007/s00024-025-03671-9

Wenbo Li, Zhifeng Wang, Rui Li, Che Yue, Wei Zhang, Shengjian Chen

{"title":"Surface Wave Numerical Simulation and Characteristics Analysis Considering the Effect of Sea Ice in the Bohai Sea, China","authors":"Wenbo Li, Zhifeng Wang, Rui Li, Che Yue, Wei Zhang, Shengjian Chen","doi":"10.1007/s00024-025-03671-9","DOIUrl":"10.1007/s00024-025-03671-9","url":null,"abstract":"<div><p>The Bohai Sea is the primary sea area in China for which sea ice exists. Sea ice affects the socio-economics of the region tremendously. Simultaneously, the existence of sea ice contributes significantly to waves. This study proposed an ice-wave parameterization scheme suitable for Bohai Sea and investigated wave characteristic trends in the Bohai Sea. We utilized the WAVEWATCH III (WW3) wave model, integrated with a sea ice model, to perform a numerical simulation of wave conditions over the past 41 years. The outcomes of wave simulation are employed to characterize the spatial and temporal features of the wave climate along with the monthly, seasonal, and annual significant wave heights (SWH) in the Bohai Sea for 1979–2019. The results show that the wave characteristics of the sea area have obvious changes after the addition of sea ice, which proves the importance of sea ice influence on waves. The attenuation rate of SWH in Liaodong Bay exceeds 30% after the addition of sea ice, while the attenuation rate in coastal areas can reach up to 60%. Besides, the regularity between the variations of sea ice and waves in Liaodong Bay has been revealed, the correlation coefficients of SWH and ice thickness, as well as ice concentration, are − 0.79 and − 0.81. In the end, the recurrence interval of SWH was studied to provide a reference for ship navigation, offshore engineering construction, wharf design, disaster prevention and reduction in the Bohai Sea.</p></div>","PeriodicalId":21078,"journal":{"name":"pure and applied geophysics","volume":"182 4","pages":"1889 - 1912"},"PeriodicalIF":1.9,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143883635","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

Nature’s Guidance: Employing Bio-inspired Algorithm and Data-Driven Model for Simulating Monthly Maximum and Average Temperature Time Series in the Middle Black Sea Region of Türkiye 自然的指引：利用生物启发算法和数据驱动模型模拟<s:1> rkiye黑海中部地区月最高和平均温度时间序列

IF 1.9 4区地球科学

pure and applied geophysics Pub Date : 2025-02-13 DOI: 10.1007/s00024-025-03678-2

Okan Mert Katipoğlu, Zeynep Özge Terzioğlu, Bilel Zerouali

{"title":"Nature’s Guidance: Employing Bio-inspired Algorithm and Data-Driven Model for Simulating Monthly Maximum and Average Temperature Time Series in the Middle Black Sea Region of Türkiye","authors":"Okan Mert Katipoğlu, Zeynep Özge Terzioğlu, Bilel Zerouali","doi":"10.1007/s00024-025-03678-2","DOIUrl":"10.1007/s00024-025-03678-2","url":null,"abstract":"<div><p>This study compares the performance of various models in predicting monthly maximum and average temperatures across three distinct regions: Samsun, Amasya, and Çorum. The evaluated models include Artificial Neural Network (ANN), Shuffled Frog Leaping Algorithm coupled with ANN (SFLA-ANN), Firefly Algorithm coupled with ANN (FFA-ANN), and Genetic Algorithm coupled with ANN (GA-ANN). In setting up the models, the dataset was divided into 70% for training and 30% for testing, and the outputs of the models were evaluated using various graphical and statistical indicators. The model with the smallest root mean square error (RMSE) value was selected for the maximum and average temperature predictions. Accordingly, for maximum and average temperature predictions, SFLA-ANN (RMSE of 2.93) and GA-ANN (RMSE of 3.55) in Samsun, GA-ANN (RMSE of 2.91) and GA-ANN (RMSE of 2.50) in Amasya and GA-ANN (RMSE of 2.97) and GA-ANN (RMSE of 2.50) in Çorum performed better than the other models, respectively. In addition, for the maximum temperature prediction with the highest accuracy, the R<sup>2</sup> value of the SFLA-ANN model in Samsun was 0.89. In contrast, the R<sup>2</sup> values of the GA-ANN model in Amasya and Çorum were determined as 0.91 and 0.91, respectively. Similarly, it was observed that the R<sup>2</sup> values of the GA-ANN model for the average temperature prediction with the highest accuracy at Samsun, Amasya and Çorum stations were 0.78, 0.92 and 0.92, respectively. Overall, the GA-ANN consistently demonstrated superior performance in predicting both maximum and average temperatures across all three regions, as evidenced by its consistently low RMSE values. These findings provide valuable insights into selecting effective models for temperature prediction tasks in different geographical regions.</p></div>","PeriodicalId":21078,"journal":{"name":"pure and applied geophysics","volume":"182 2","pages":"877 - 901"},"PeriodicalIF":1.9,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00024-025-03678-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638220","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

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