Journal of Seismology最新文献_第3页

Kinematic rupture modeling of broadband ground motion from the 2022 MS6.9 Menyuan earthquake 2022年门源MS6.9地震宽带地震动的运动学破裂模拟

IF 1.6 4区地球科学

Journal of Seismology Pub Date : 2024-10-14 DOI: 10.1007/s10950-024-10247-y

Mengtao Wu, Jun Yang

{"title":"Kinematic rupture modeling of broadband ground motion from the 2022 MS6.9 Menyuan earthquake","authors":"Mengtao Wu, Jun Yang","doi":"10.1007/s10950-024-10247-y","DOIUrl":"10.1007/s10950-024-10247-y","url":null,"abstract":"<div><p>We propose a novel kinematic rupture modeling procedure for synthesizing broadband ground motions derived from the frequency-wavenumber integration algorithm. This procedure addresses two key issues in characterizing the rupture processes relevant to broadband seismic radiation: an accurate Green's function and a well-constrained kinematic source model. For the first issue, we derive the theoretical Green's function based on an improved dynamic stiffness matrix approach that effectively handles wave propagation in a 1D crustal velocity structure across a broad frequency band. For the second issue, we generate the hybrid source model that combines asperity slip and random slip over the fault plane to effectively implement constraints on the radiated energy during the whole rupture process. The accuracy and effectiveness of the proposed methodology are verified by comparing with the surface acceleration traces and Fourier spectra calculated by spectral element method. With the hybrid source model and crustal velocity structure applicable to the target area, the broadband (0–10 Hz) ground motion of the 2022 <i>M</i><sub>S</sub>6.9 Menyuan earthquake is synthesized. The amplitude, duration, and frequency content of the synthetic motions are systematically compared with those of the available observed records and ground motion attenuation relationships, as well as the spatial distribution characteristics of the near-field ground motions from the earthquake scenarios are presented. In conclusion, the case study of the Menyuan <i>M</i><sub>S</sub>6.9 earthquake demonstrates that the presented modeling procedure can estimate broadband ground motions rapidly and reliably from a physics-based kinematic rupture perspective.</p></div>","PeriodicalId":16994,"journal":{"name":"Journal of Seismology","volume":"28 6","pages":"1537 - 1563"},"PeriodicalIF":1.6,"publicationDate":"2024-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10950-024-10247-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142941288","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

Analysis of the influential factors controlling the occurrence of injection-induced earthquakes in Northeast British Columbia, Canada, using machine-learning-based algorithms 基于机器学习的算法分析加拿大不列颠哥伦比亚省东北部注入地震发生的影响因素

IF 1.6 4区地球科学

Journal of Seismology Pub Date : 2024-10-07 DOI: 10.1007/s10950-024-10248-x

Fatemeh Esfahani, Alireza Babaie Mahani, Honn Kao

{"title":"Analysis of the influential factors controlling the occurrence of injection-induced earthquakes in Northeast British Columbia, Canada, using machine-learning-based algorithms","authors":"Fatemeh Esfahani, Alireza Babaie Mahani, Honn Kao","doi":"10.1007/s10950-024-10248-x","DOIUrl":"10.1007/s10950-024-10248-x","url":null,"abstract":"<div><p>We use a machine learning approach based on the Extreme Gradient Boosting algorithm to analyze the controlling factors of injection induced earthquakes (IIE) in northeast British Columbia (NE BC), particularly hydraulic fracturing induced seismicity within the Montney unconventional resource play. We compile comprehensive datasets incorporating seismological, operational, and stratigraphic features corresponding to various spatiotemporal grids to rank the controlling factors in terms of their importance. Our results show that, in general, the number of hydraulic fracturing stage is the most important factor controlling IIE, followed by cumulative volume of injected fluid and two depth-related features: depth difference between hydraulic fracturing injection and Montney formation and depth difference between Precambrian basement and Montney formation. Out of 168 datasets with varying spatiotemporal grids, the best model performance is achieved for the dataset with spatial grid of 0.1 degree and temporal grid of 10 days. Based on the Shapley Additive exPlanations values, we observe that a threshold of ~ 2200 in the number of hydraulic fracturing stages significantly encourages the occurrence of IIE while the threshold for cumulative volume of injected fluid is ~ 500,000 m<sup>3</sup>. Moreover, the occurrence of IIE is mostly encouraged when injections occur within ~ 300 m below the top of Montney formation (associated with the maximum thickness of this formation in NE BC) and at ~ 1700 m above the top of Precambrian basement.</p></div>","PeriodicalId":16994,"journal":{"name":"Journal of Seismology","volume":"28 6","pages":"1489 - 1504"},"PeriodicalIF":1.6,"publicationDate":"2024-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142940999","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

Assessing the reliability of the EMSC testimonies database and its potential use for the generation of near-real-time ShakeMaps in the Aegean area 评估EMSC证据数据库的可靠性及其在爱琴海地区近实时地震地图生成方面的潜在用途

IF 1.6 4区地球科学

Journal of Seismology Pub Date : 2024-10-07 DOI: 10.1007/s10950-024-10250-3

Michail Ravnalis, Costas Papazachos, Christos Papaioannou, Remy Bossu, Charalampos Kkallas, Christos Evangelidis, Petros Triantafyllidis, Kiriaki Konstantinidou

{"title":"Assessing the reliability of the EMSC testimonies database and its potential use for the generation of near-real-time ShakeMaps in the Aegean area","authors":"Michail Ravnalis, Costas Papazachos, Christos Papaioannou, Remy Bossu, Charalampos Kkallas, Christos Evangelidis, Petros Triantafyllidis, Kiriaki Konstantinidou","doi":"10.1007/s10950-024-10250-3","DOIUrl":"10.1007/s10950-024-10250-3","url":null,"abstract":"<div><p>We investigate the possibility of combined interpretation of macroseismic and strong-motion data for recent large earthquakes in the Aegean area. We employ macroseismic information derived from EMSC testimonies, as well as strong-motion information extracted from online sources provided by two Greek institutes (ITSAK and GEIN-NOA). The EMSC testimonies database (https://www.seismicportal.eu/testimonies-ws/) is a widely used inventory for the damage distribution of significant earthquakes. The collected data were first compared with the predicted macroseismic intensities using the empirical relation of Papazachos and Papaioannou (J Seismol 1:181–201, 1997) While the correlation between the observed and modeled data was found to be satisfactory, a systematic bias is evident for very high and very low values intensities derived from the reported EMSC testimonies. A Monte Carlo simulation approach was employed to identify the source of this bias, suggesting that it is a result of the large scatter of the EMSC data and the limits of the macroseismic scale used. To minimize this effect, a spatial grouping and smoothing approach was adopted for the EMSC dataset, resulting in significantly improved correlations with the available independent strong motion estimates, such as PGA and PGV. Using this correlation, we demonstrate through several examples that it is possible to reconstruct the main features of the damage pattern for strong earthquakes in the Aegean. This is achieved by jointly analyzing rapidly crowdsourced EMSC data and strong motion information, after appropriate processing of the raw macroseismic dataset.</p></div>","PeriodicalId":16994,"journal":{"name":"Journal of Seismology","volume":"28 6","pages":"1351 - 1372"},"PeriodicalIF":1.6,"publicationDate":"2024-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142941001","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

Characterizing Egyptian National Seismic Network station sites using genetic optimization for microtremor data inversion 利用遗传优化方法反演埃及国家地震台网站点微震数据

IF 1.6 4区地球科学

Journal of Seismology Pub Date : 2024-10-04 DOI: 10.1007/s10950-024-10245-0

Sayed S. R. Moustafa, Ahmad M. Faried, Mohamed H. Yassien

{"title":"Characterizing Egyptian National Seismic Network station sites using genetic optimization for microtremor data inversion","authors":"Sayed S. R. Moustafa, Ahmad M. Faried, Mohamed H. Yassien","doi":"10.1007/s10950-024-10245-0","DOIUrl":"10.1007/s10950-024-10245-0","url":null,"abstract":"<div><p>Precise site response characterization is essential for understanding lithostratigraphic subsurface properties, seismic site effects, and soil classification within seismic networks. This study addresses the challenge of limited shear-wave velocity data within the upper 30 meters (<span>(V_{S30})</span>) at 39 stations of the Egyptian National Seismic Network (ENSN) in Northern Egypt. We employ the inversion of Horizontal-to-Vertical Spectral Ratio (HVSR) data from single-station ambient noise using an Elitist Genetic Algorithm (EGA) to estimate the shear-wave velocity profile at each station. This algorithm uses an equivalent linear approach based on the viscoelastic Kelvin-Voigt model to compute the theoretical site response of horizontally stratified soil layers. Inversion results from Multichannel Analysis of Surface Waves (MASW) conducted at five ENSN stations were incorporated to refine the input inversion parameters and control the genetic HVSR inversion outcomes. This approach effectively demonstrates the HVSR method’s ability to detect variations in the shear-wave velocity structure with depth and determine the average shear-wave velocity in the upper 30 meters. The obtained site-specific amplification data contributes to a more detailed understanding of site conditions, enabling precise determination of site classification and characterization factors. This facilitates refined Peak Ground Acceleration (PGA) estimations, thereby substantially enhancing the robustness of future seismic hazard assessments in Egypt.</p></div>","PeriodicalId":16994,"journal":{"name":"Journal of Seismology","volume":"28 6","pages":"1445 - 1470"},"PeriodicalIF":1.6,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142941072","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

Rupture directivity of the 2019 ML 6.3 Xiulin (Taiwan) earthquake estimated by near-field seismograms 用近场地震记录估计2019年台湾秀林ML 6.3地震的破裂方向

IF 1.6 4区地球科学

Journal of Seismology Pub Date : 2024-10-01 DOI: 10.1007/s10950-024-10251-2

Ruey-Der Hwang, Chiung-Yao Lin, Cai-Yi Lin

{"title":"Rupture directivity of the 2019 ML 6.3 Xiulin (Taiwan) earthquake estimated by near-field seismograms","authors":"Ruey-Der Hwang, Chiung-Yao Lin, Cai-Yi Lin","doi":"10.1007/s10950-024-10251-2","DOIUrl":"10.1007/s10950-024-10251-2","url":null,"abstract":"<div><p>We deconvolved regional seismograms to derive the azimuth-dependent source time functions for the 2019 Xiulin (Taiwan) earthquake. Subsequently, using rupture directivity and multiple-event analyses, we investigated the earthquake’s rupture features. The rupture directivity analysis revealed a rupture length of 11.5 km, a source duration of 7.37 s, and a rupture velocity (Vr) of 1.56 km/s, approximately 0.4 times the crustal S-wave velocity. The multiple-event analysis indicated two sub-ruptures during the earthquake. Notably, the average rupture and the sub-rupture shared the same product of Δσ<sub>S</sub>Vr<sup>3</sup> (Δσ<sub>S</sub>: static stress drop), adhering to a specific source-scaling relationship. In summary, the 2019 Xiulin earthquake exhibited a relatively low Vr and a relatively high Δσ<sub>S</sub>. Additionally, we observed similarities between the 2018 Hualien and 2019 Xiulin earthquakes by comparing their fault parameters. The rupture directivity analysis revealed that both earthquakes occurred on the same westward-dipping plane, suggesting that the 2019 Xiulin earthquake represented the residual stress release from the 2018 Hualien earthquake. Compared with the Hualien earthquake, the Xiulin earthquake dissipated more energy per unit area to rupture the fault.</p></div>","PeriodicalId":16994,"journal":{"name":"Journal of Seismology","volume":"28 6","pages":"1565 - 1576"},"PeriodicalIF":1.6,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142940982","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

Influence of seismological factors to earthquake-induced tsunami and sensitivity of structural response to orientations 地震因素对地震海啸的影响及结构对方位反应的敏感性

IF 1.6 4区地球科学

Journal of Seismology Pub Date : 2024-09-30 DOI: 10.1007/s10950-024-10249-w

Mrityunjoy Naskar, Sunil Singh Mayengbam, Rana Roy

{"title":"Influence of seismological factors to earthquake-induced tsunami and sensitivity of structural response to orientations","authors":"Mrityunjoy Naskar, Sunil Singh Mayengbam, Rana Roy","doi":"10.1007/s10950-024-10249-w","DOIUrl":"10.1007/s10950-024-10249-w","url":null,"abstract":"<div><p>The present paper aims to investigate the implications of the seismological factors (strike angle, rake angle, dip angle, focal depth, and magnitude) on the characteristics (inundation depth/wave height and velocity) of earthquake-induced tsunamis. The uniform slip model is used primarily for characterizing the seismic source and exploring how various seismological factors affect tsunami characteristics. The observed tsunami characteristics is physically explained in far and near fields in light of the seismological factors and wave characteristics. Since unidirectional analysis is generally adopted for tsunami design, sensitivity of structural response to orientations is studied in detail. It has been shown that there exists an orientation that can be determined in terms of pure tsunami characteristics in which the structural response achieves its maximum. Simple case studies are illustrated, and it is shown that, for a deterministic tsunami scenario, the maximum values of inter-story drift may be estimated by a single unidirectional analysis resolving velocity components in the orientation defined herein as the most intense orientation. When assessing structural responses, both uniform and non-uniform slip models are considered simultaneously. Interestingly, although the uniform slip model may provide an unconservative estimate of structural response, it can still accurately predict the orientation that corresponds to the maximum response, similar to the non-uniform slip model.</p></div>","PeriodicalId":16994,"journal":{"name":"Journal of Seismology","volume":"28 6","pages":"1505 - 1536"},"PeriodicalIF":1.6,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142941239","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

Conditional earthquake probabilities along the North Anatolian fault zone based on inverse Gaussian against lognormal distribution 基于逆高斯反对数正态分布的北安那托利亚断裂带条件地震概率

IF 1.6 4区地球科学

Journal of Seismology Pub Date : 2024-09-25 DOI: 10.1007/s10950-024-10244-1

Murat Nas, Yusuf Bayrak, Eleni Mpapka, Theodoros M. Tsapanos

{"title":"Conditional earthquake probabilities along the North Anatolian fault zone based on inverse Gaussian against lognormal distribution","authors":"Murat Nas, Yusuf Bayrak, Eleni Mpapka, Theodoros M. Tsapanos","doi":"10.1007/s10950-024-10244-1","DOIUrl":"10.1007/s10950-024-10244-1","url":null,"abstract":"<div><p>This study offers a comprehensive forecast of conditional earthquake recurrence probabilities in the North Anatolian Fault Zone (NAFZ), utilizing advanced statistical models and temporal analyses, aiming to discern the likelihood of future earthquakes. We sought to contribute insights into seismic hazard assessment by analyzing earthquakes (M<sub>W</sub> ≥ 4.0) from 1900–2022, employing Inverse Gaussian (aka Brownian Passage Time) and Lognormal distribution models, categorizing the NAFZ into ten seismic zones. Rigorous model fitness assessments were conducted, including Akaike and Bayesian information criteria, Kolmogorov–Smirnov, and Anderson–Darling tests. Conditional probabilities were calculated across eleven temporal intervals (0–50 years) and eleven residual periods (1–50 years), starting on January 1, 2023, and extending into the future. Results reveal nuanced earthquake probabilities, highlighting a heterogeneous seismic hazard landscape. Probability forecasts surge within the initial five years and continue to rise for another five years, underscoring the spatiotemporal sensitivity and widespread earthquake hazard. The findings enhance the understanding of seismic hazard assessment, extending the future applicability potential to global seismic regions. Acknowledging uncertainties and relying on instrumental data, future research could explore more extensive areas and refined data sources, along with new modeling techniques, to enhance forecasting accuracy. The findings stress the need for earthquake preparedness throughout the study area, not only for the anticipated large earthquakes but especially for medium-magnitude earthquakes. This remark manifestly underscores the necessity to develop strategies to reduce possible damage and loss of life stemming from the collapse of non-engineered and rural building stock unevenly scattered along the NAFZ that remain vulnerable to moderate-magnitude earthquakes.</p></div>","PeriodicalId":16994,"journal":{"name":"Journal of Seismology","volume":"28 6","pages":"1389 - 1420"},"PeriodicalIF":1.6,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142941136","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

Evaluation of geotechnical properties of Doğanşehir district with geographical information systems after the February 6, 2023 earthquakes 利用地理信息系统评价2023年2月6日地震后Doğanşehir地区的岩土特性

IF 1.6 4区地球科学

Journal of Seismology Pub Date : 2024-09-23 DOI: 10.1007/s10950-024-10246-z

Talha Sarici, Rumeysa Tugba Ozcan

{"title":"Evaluation of geotechnical properties of Doğanşehir district with geographical information systems after the February 6, 2023 earthquakes","authors":"Talha Sarici, Rumeysa Tugba Ozcan","doi":"10.1007/s10950-024-10246-z","DOIUrl":"10.1007/s10950-024-10246-z","url":null,"abstract":"<div><p>Parameters such as the bearing capacity of the soil and liquefaction potentials are of vital importance, as can be seen in the Kahramanmaraş-centered earthquakes that occurred on February 6, 2023. At this point, the bearing capacity and liquefaction potentials of the Doğanşehir district of Malatya province, which has experienced many devastations both historically and recently, were investigated with the micro zonation investigation reports obtained from Malatya Metropolitan Municipality. The correlations recommended by the international literature and Turkish Building Earthquake Code were used and the results were mapped with a package program working with Geographical Information Systems. In addition, the groundwater level, seismic parameters and soil classifications of the study area were determined and then mapped. Liquefaction potentials were observed throughout the study area, including the central settlement of Doğanşehir, and this potential was observed even at a depth of 12 m in some areas. It was also found that the bearing capacity values of the central settlement were lower than the other regions. Finally, post-earthquake damages were interpreted based on the maps created within the scope of the study. It was understood that such studies are of vital importance for earthquake-prone regions before and after earthquakes.</p></div>","PeriodicalId":16994,"journal":{"name":"Journal of Seismology","volume":"28 6","pages":"1421 - 1444"},"PeriodicalIF":1.6,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142941220","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

Source parameters of the May 28, 2016, Mihoub earthquake (Mw 5.4, Algeria) deduced from Bayesian modelling of Sentinel-1 SAR data 通过对 Sentinel-1 SAR 数据进行贝叶斯建模推导出的 2016 年 5 月 28 日 Mihoub 地震（阿尔及利亚，5.4 级）震源参数

IF 1.6 4区地球科学

Journal of Seismology Pub Date : 2024-09-13 DOI: 10.1007/s10950-024-10243-2

S. Miloudi, M. Meghraoui, T. Nozadkhalil, E. Cetin, F. Semmane, M. Khelif

{"title":"Source parameters of the May 28, 2016, Mihoub earthquake (Mw 5.4, Algeria) deduced from Bayesian modelling of Sentinel-1 SAR data","authors":"S. Miloudi, M. Meghraoui, T. Nozadkhalil, E. Cetin, F. Semmane, M. Khelif","doi":"10.1007/s10950-024-10243-2","DOIUrl":"10.1007/s10950-024-10243-2","url":null,"abstract":"<div><p>Synthetic aperture radar interferometry (InSAR) is a powerful technique for quantifying the co- and postseismic deformation of large earthquakes at the Earth’s surface. However, surface deformation caused by small- to moderate-sized earthquakes is rarely revealed by InSAR because their coseismic slip occurs mostly at significant depths (> 5 km), with limited deformation on the Earth’s surface. In this work, we investigate the surface deformation associated with the Mw 5.4 May 28, 2016, Mihoub (Algeria) earthquake and its source parameters. Interferograms calculated from Sentinel-1 TOPSAR images of both ascending and descending orbits show that, despite its small size, the earthquake produced evident deformation on the Earth’s surface, suggesting that the coseismic slip took place at a relatively shallow depth. We model the coseismic displacement fields extracted from InSAR time series using Bayesian approaches in two stages: 1) we model the coseismic slip data using uniform slip on a single fault to constrain the fault parameters. 2) We explore a variable slip model with varying rakes on the discretized fault obtained in the first stage. The modelling results indicate that the earthquake was associated with a ~ 0.5 m shallow oblique reverse slip, mostly between depths of 1.5 and 4.5 km, on a NE–SW-trending and SE-dipping thrust fault, which is in good agreement with the focal mechanism solutions of the earthquake deduced from seismology. This study demonstrates that the multitemporal InSAR (MTI) method may constrain surface displacements when the coseismic interferograms of moderate- to small-sized earthquakes are noisy and hence difficult to unwrap. The newly identified seismogenic Mihoub fault has implications for seismic hazard assessment in northern Algeria.</p></div>","PeriodicalId":16994,"journal":{"name":"Journal of Seismology","volume":"28 5","pages":"1173 - 1181"},"PeriodicalIF":1.6,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215456","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

Fault imaging using earthquake sequences: a revised seismotectonic model for the Albstadt Shear Zone, Southwest Germany 利用地震序列进行断层成像：德国西南部阿尔布施塔特剪切带的地震构造模型修订版

IF 1.6 4区地球科学

Journal of Seismology Pub Date : 2024-09-13 DOI: 10.1007/s10950-024-10241-4

Sarah Mader, Joachim R. R. Ritter, Andrea Brüstle, AlpArray Working Group

{"title":"Fault imaging using earthquake sequences: a revised seismotectonic model for the Albstadt Shear Zone, Southwest Germany","authors":"Sarah Mader, Joachim R. R. Ritter, Andrea Brüstle, AlpArray Working Group","doi":"10.1007/s10950-024-10241-4","DOIUrl":"10.1007/s10950-024-10241-4","url":null,"abstract":"<div><p>In Germany, the highest seismic hazard is associated with the Albstadt Shear Zone (ASZ) in the western Swabian Jura, a low mountain range in southwest Germany. The region is affected by continuous micro-seismic activity with the potential for damaging earthquakes (nine events with <i>ML</i> <span>(ge )</span> 5 in the 20<span>(^{th})</span> century). Within the AlpArray and StressTransfer projects nine temporary seismic stations have been installed in the region of the ASZ to densify the permanent seismic monitoring. In October 2018 and September 2019, the state seismological survey (LED) detected two low-magnitude earthquake sequences with hundreds of events in the area. The temporarily densified local network allows us to systematically analyze these sequences and to search for other sequences by applying a template-matching routine on data from 2018 to 2020. In total, six earthquake sequences could be identified with at least 10 events. The four largest sequences (> 50 events) consist of two fore- and aftershock sequence and two earthquake swarms. Earthquake swarms were so far not observed around the ASZ. Precise relative hypocenter relocations and the determination of fault-plane solutions allow us to propose a seismotectonic model based on the three imaged fault types: (a) The well-known NNE-SSW striking sinistral strike-slip ASZ at depths of 5-10 km, (b) a NW-SE striking dextral strike-slip fault zone at depths of 11-15 km beneath the Hohenzollerngraben (HZG), a shallow, apparently aseismic NW-SE striking graben structure; this NW-SE fault zone possibly is an inherited zone of weakness in the basement and facilitated the development of the HZG and (c) at the intersection of the ASZ with the NW-SE fault zone, complex faulting in form of NNW-SSE striking sinistral strike-slip and normal faulting possibly to accommodate local stresses.</p></div>","PeriodicalId":16994,"journal":{"name":"Journal of Seismology","volume":"28 5","pages":"1105 - 1146"},"PeriodicalIF":1.6,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10950-024-10241-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215460","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