Earthquake Research Advances最新文献_第7页

Seismicity and seismogenic mechanism of the MS 6.0 Luxian earthquake on September 16, 2021 2021 年 9 月 16 日泸县 MS 6.0 级地震的震度和成震机制

Earthquake Research Advances Pub Date : 2023-10-01 DOI: 10.1016/j.eqrea.2023.100253

Kezhen Zuo, Cuiping Zhao

{"title":"Seismicity and seismogenic mechanism of the MS 6.0 Luxian earthquake on September 16, 2021","authors":"Kezhen Zuo, Cuiping Zhao","doi":"10.1016/j.eqrea.2023.100253","DOIUrl":"10.1016/j.eqrea.2023.100253","url":null,"abstract":"<div><p>Based on the seismic data recorded by the China Earthquake Networks Center (CENC) in the Luxian area from January 2009 to October 2021, the 3D <em>V</em><sub>P</sub>, <em>V</em><sub>S</sub>, <em>V</em><sub>P</sub>/<em>V</em><sub>S</sub> structures and seismic locations of the area are obtained by joint inversion using the <em>V</em><sub>P</sub>/<em>V</em><sub>S</sub> model consistency-constrained double-difference tomography method (tomoDDMC). The earthquakes in the study area are mainly concentrated at a depth of 2–6 km, and the focal depth is generally shallow. The <em>M</em><sub>S</sub> 6.0 Luxian earthquake occurred at the transition zone of high- and low-velocity anomalies and the aftershock sequence was distributed along the edge of the low-<em>V</em><sub>P</sub> zone. A small number of foreshocks occurred on the west side of the <em>M</em><sub>S</sub> 6.0 Luxian earthquake, while most of the aftershocks were distributed on the east side of the <em>M</em><sub>S</sub> 6.0 Luxian earthquake. The aftershock sequence consisted of three seismic bands with different trends, and the overall distribution was in a NWW direction, which was inconsistent with the spatial distribution of the main active faults nearby. In addition, the spatiotemporal distribution of earthquakes and the variation of <em>b</em>-values are closely related to the industrial water injection activities in the study area, reflecting the activation of pre-existing hidden faults under certain tectonic and stress environments leading to seismic activities in the area.</p></div>","PeriodicalId":100384,"journal":{"name":"Earthquake Research Advances","volume":"3 4","pages":"Article 100253"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772467023000507/pdfft?md5=aac3d3bb3843778bbf3f4429a7199f4d&pid=1-s2.0-S2772467023000507-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135656880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Focal mechanism of Luding M 6.8 earthquake, September 2022 and analysis of the loading role of the tectonic stress on the seismogenic fault 2022年9月泸定6.8级地震震源机制及构造应力对发震断层的加载作用分析

Earthquake Research Advances Pub Date : 2023-07-01 DOI: 10.1016/j.eqrea.2023.100216

Yansong Hu, Zhenyue Li, Ruifeng Liu, Zibo Wang

{"title":"Focal mechanism of Luding M 6.8 earthquake, September 2022 and analysis of the loading role of the tectonic stress on the seismogenic fault","authors":"Yansong Hu, Zhenyue Li, Ruifeng Liu, Zibo Wang","doi":"10.1016/j.eqrea.2023.100216","DOIUrl":"https://doi.org/10.1016/j.eqrea.2023.100216","url":null,"abstract":"<div><p>To reveal the seismogenic mechanism of the Luding earthquake, we employed the 118 China Seismic Network stations to collect the P-wave polarity data from each station, which was then used in the P-wave first motion approach to calculate the focal mechanism solution of the <em>M</em>6.8 Luding earthquake that occurred on September 5, 2022. We have also studied the loading effect of tectonic stress on the Luding earthquake fault based on the stress field data for the research area. The results indicate that this earthquake was a strike-slip type, the nodal plane I: strike 167°, dip Angle 78°, slip Angle 2°; Nodal plane Ⅱ: strike 77°, dip Angle 88°, slip Angle 168°. The two fault planes’ instability coefficients of the Luding earthquake are examined considering the region’s background stress field’s condition. The nodal plane I in the Moho circle is discovered to practically coincide with the Coulomb failure line and the tangent point of the Moho circle, indicating that this nodal plane has a high instability coefficient compared to the nodal plane II. The conclusion is that the nodal plane I has a higher likelihood of being the seismogenic fault plane, which is congruent with the seismogenic fault plane suggested by the aftershock distribution, the earthquake radiation energy distribution of a single station, and seismic intensity distribution. The Luding earthquake’s focal mechanism is highly like the theoretical focal mechanism of the fault situated at the location where the Coulomb failure line intersects the Mohr circle, demonstrating that background stress is what caused the earthquake. The substantial fault instability and similarity between the solved and theoretical focal mechanisms make it easier to comprehend the loading effect of tectonic stress on the Luding earthquake fault.</p></div>","PeriodicalId":100384,"journal":{"name":"Earthquake Research Advances","volume":"3 3","pages":"Article 100216"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49704375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Indian plate blocked by the thickened Eurasian crust in the middle of the continental collision zone of southern Tibet 在西藏南部大陆碰撞带的中部，印度板块被加厚的欧亚地壳阻挡

Earthquake Research Advances Pub Date : 2023-07-01 DOI: 10.1016/j.eqrea.2023.100233

Gaochun Wang , Xiaobo Tian , Yibing Li , Tao Xu , Bo Wan , Yi Chen , Shitan Nie , Xusong Yang , Sicheng Zuo , Jianli Zhang

{"title":"Indian plate blocked by the thickened Eurasian crust in the middle of the continental collision zone of southern Tibet","authors":"Gaochun Wang , Xiaobo Tian , Yibing Li , Tao Xu , Bo Wan , Yi Chen , Shitan Nie , Xusong Yang , Sicheng Zuo , Jianli Zhang","doi":"10.1016/j.eqrea.2023.100233","DOIUrl":"https://doi.org/10.1016/j.eqrea.2023.100233","url":null,"abstract":"<div><p>The relationship of the crustal contact between the Indian and Eurasian plates is a key issue in understanding crustal thickening and the subduction of the Indian lithosphere beneath the Qinghai-Tibetan Plateau. Across the middle of the Yarlung-Zangbo Suture (YZS), we deployed an ∼450-km-long SN-trending wide-angle reflection/refraction profile to observe the P-wave velocity (<em>v</em><sub>P</sub>) structure beneath the northern Himalaya and the southern plateau. Our results show that, 1. the high <em>v</em><sub>P</sub> (∼7.1 km/s) indicates that the Indian lower crust extends no more than 50 km north of the YZS. 2. The lower crust beneath the southern part of the plateau features an extremely low <em>v</em><sub>P</sub> (<6.7 ± 0.2 km/s). 3. Compared with the velocities of several typical crustal lithologies in different temperature regimes, the low <em>v</em><sub>P</sub> in the lower crust can be explained by felsic-intermediate granulite, which has prevented the lower crust from further eclogitization. We propose that the dip angle of the Indian lithospheric slab beneath the YZS is partly controlled by the composition of the lower crust of the plateau. In the northern middle YZS, the crust of the southern plateau is too thick and blocks the northward advancement of the Indian lower crust, resulting in the subduction of the Indian lithospheric slab into the upper mantle. The lower crust in western and eastern Lhasa is dominated by a mafic composition, and it was delaminated after eclogitization before the Miocene. The void zone generated by delamination favors the flattening and underthrusting of the Indian lower crust.</p></div>","PeriodicalId":100384,"journal":{"name":"Earthquake Research Advances","volume":"3 3","pages":"Article 100233"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49703926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","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 experiments and numerical simulations on the effects of stress perturbations on fault slip 应力扰动对断层滑动影响的实验与数值模拟研究进展

Earthquake Research Advances Pub Date : 2023-07-01 DOI: 10.1016/j.eqrea.2023.100220

Yuanmin Huang , Shengli Ma , Xiaohui Li , Ye Shao

{"title":"Advances in experiments and numerical simulations on the effects of stress perturbations on fault slip","authors":"Yuanmin Huang , Shengli Ma , Xiaohui Li , Ye Shao","doi":"10.1016/j.eqrea.2023.100220","DOIUrl":"https://doi.org/10.1016/j.eqrea.2023.100220","url":null,"abstract":"<div><p>Laboratory experiments and numerical simulations on rock friction perturbations, an important means for understanding the mechanism and influencing factors of stress-triggered earthquakes, are of great significance for studying earthquake mechanisms and earthquake hazard analysis. We reviews the experiments and numerical simulations on the effects of stress perturbations on fault slip, and the results show that stress perturbations can change fault stress and trigger earthquakes. The Coulomb failure criterion can shed light on some questions about stress-triggering earthquakes but cannot explain the time dependence of earthquake triggering nor be used to investigate the effect of heterogeneous stress perturbations. The amplitude and period are important factors affecting the correlation between stress perturbation and fault instability. The effect of the perturbation period on fault instability is still controversial, and the effect of the high-frequency perturbation on earthquakes may be underestimated. Normal and shear stress perturbation can trigger fault instability, but their effects on fault slip differ. It is necessary to distinguish whether the stress perturbation is dominated by shear or normal stress change when it triggers fault instability. Fault tectonic stress plays a decisive effect on the mode of fault instability and earthquake magnitude. Acoustic emission activity can reflect the changes in fault stress and the progression of fault nucleation, and identify the meta-instability stage and precursor of fault instability, providing a reference for earthquake prediction.</p></div>","PeriodicalId":100384,"journal":{"name":"Earthquake Research Advances","volume":"3 3","pages":"Article 100220"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49704177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Freely accessible inventory and spatial distribution of large-scale landslides in Xianyang City, Shaanxi Province, China 陕西咸阳市大型滑坡的可自由获取资源及空间分布

Earthquake Research Advances Pub Date : 2023-07-01 DOI: 10.1016/j.eqrea.2023.100217

Jingyu Chen , Lei Li , Chong Xu , Yuandong Huang , Zhihua Luo , Xiwei Xu , Yuejun Lyu

{"title":"Freely accessible inventory and spatial distribution of large-scale landslides in Xianyang City, Shaanxi Province, China","authors":"Jingyu Chen , Lei Li , Chong Xu , Yuandong Huang , Zhihua Luo , Xiwei Xu , Yuejun Lyu","doi":"10.1016/j.eqrea.2023.100217","DOIUrl":"https://doi.org/10.1016/j.eqrea.2023.100217","url":null,"abstract":"<div><p>In this study, we used high-resolution optical satellite images on the Google Earth platform to map large-scale landslides in Xianyang City, Shaanxi Province, China. After mapping, a comprehensive and detailed large-scale landslide inventory that contains 2924 large-scale landslides was obtained. We analyzed the spatial distribution of landslides with seven influencing factors, including elevation, slope angle, aspect, curvature, lithology, distance to a river, and distance to the fault. Landslide Number, Landslide Area, Landslide Number Density (LND), and Landslide Area Percentage (LAP) were selected as indexes for the spatial distribution analysis. The results show that the number and area of landslides in the elevation range of 1000–1200 m is the highest. The highest number of landslides was observed in the slope angle of 25°–30°. North-facing slopes are prone to sliding. The area and number of landslides are the largest when the slope curvature ranges from −1.28 to 0. The LND and LAP reach their maxima when the slope curvature is less than −2.56. Areas covered by the Tertiary stratum with weakened fine-grained sandstone and siltstone show the highest LND and LAP values. Regarding distance to a river, the LAP peaks in the range of 300–600 m, whereas the LND peaks in an area larger than 2100 m. The values of LND and LNP rise as the distance from the faults increases, except for the locations 30 km away from active faults. This phenomenon is because active faults in this area pass through the plain areas, while landslides mostly occur in mountainous areas. The cataloging of landslide development in Xianyang City provides a significant scientific foundation for future research on landslides. In addition, the spatial distribution results are useful for landslide hazard prevention decisions and provide valuable references in this area.</p></div>","PeriodicalId":100384,"journal":{"name":"Earthquake Research Advances","volume":"3 3","pages":"Article 100217"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49703735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Detailed sedimentary structure of the Mianning segment of the Anninghe fault zone revealed by H/V spectral ratio H/V谱比值揭示了安宁河断裂带冕宁段详细的沉积构造

Earthquake Research Advances Pub Date : 2023-07-01 DOI: 10.1016/j.eqrea.2023.100232

Zeqiang Chen , Huajian Yao , Xihui Shao , Song Luo , Hongfeng Yang

{"title":"Detailed sedimentary structure of the Mianning segment of the Anninghe fault zone revealed by H/V spectral ratio","authors":"Zeqiang Chen , Huajian Yao , Xihui Shao , Song Luo , Hongfeng Yang","doi":"10.1016/j.eqrea.2023.100232","DOIUrl":"https://doi.org/10.1016/j.eqrea.2023.100232","url":null,"abstract":"<div><p>The Anninghe fault is a major left-lateral strike-slip fault in southwest China and a seismic gap with a potential earthquake larger than <em>M</em><sub>W</sub> 7.0 lies in the Mianning-Xichang segment according to recent observations. The shallow structure of this region can offer a glimpse into the geometry of the fault, which plays an important role in earthquake hazard mitigation. To further investigate the sedimentary structure of the Anninghe fault zone, two dense linear arrays with a station spacing of around 80 m were deployed across the fault. In this study, the H/V spectral ratio (HVSR), together with its peak frequency at each station site, was obtained by applying the Nakamura method. Our findings demonstrate that the peak frequency behaves in high correlation with lithology and is controlled by topography. HVSR in foothills or regions with magmatic intrusion shows a single peak at about 2–3 Hz. In locations with abundant Quaternary sedimentation, such as Anninghe valleys and fracture zones, another low-frequency peak around 0.4 Hz can be noticed in HVSR. By using the empirical relationship, the thickness of the sedimentary layer around the fault fracture zone is estimated to be 300–600 m. Furthermore, the sedimentary interface shows a downward dip to the east, possibly influenced by the east-west extrusion stress. Considering the resonance effect, buildings with 6–9 stories in the valley area of the Anninghe require additional attention in earthquake hazard prevention.</p></div>","PeriodicalId":100384,"journal":{"name":"Earthquake Research Advances","volume":"3 3","pages":"Article 100232"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49704297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

A palaeoearthquake event and its age revealed by the travertine layer along the Litang fault in the southeastern margin of the Qinghai-Tibetan plateau 青藏高原东南缘理塘断裂钙华层揭示的一次古地震事件及其时代

Earthquake Research Advances Pub Date : 2023-07-01 DOI: 10.1016/j.eqrea.2023.100215

Yao Yang , Mingjian Liang , Chao Ma , Jun Li , Hualiang Shen , Fang Du , Song Luo , Shao Liu , Xuelian Rui

{"title":"A palaeoearthquake event and its age revealed by the travertine layer along the Litang fault in the southeastern margin of the Qinghai-Tibetan plateau","authors":"Yao Yang , Mingjian Liang , Chao Ma , Jun Li , Hualiang Shen , Fang Du , Song Luo , Shao Liu , Xuelian Rui","doi":"10.1016/j.eqrea.2023.100215","DOIUrl":"https://doi.org/10.1016/j.eqrea.2023.100215","url":null,"abstract":"<div><p>The Litang fault (LTF), located in the southeast of the Qinghai-Tibetan Plateau, is known for its high level of present-day seismicity, whereas its Pleistocene activity has been scarcely documented. This study focused on a tract of banded travertine deposits precipitated from thermal waters along the NW–SE-trending LTF trace. The role of travertine deposits in recording neotectonic activity has been studied by identifying their internal structure. Typical soft-sediment deformation structures observed within the banded travertines include micro folds, liquefied breccia, and liquefied diapirs. These deformed structures, which are restricted to a single unit separated unconformably by undeformed layers, can be traced for tens of meters, indicating that they were formed by seismic shaking triggered by LTF activity. The deformation of the banded travertine layers is attributed to the combined effects of seismic shaking, liquefaction, and fluidization, and it can be related to a paleo earthquake event with a magnitude of <em>M<sub>S</sub></em> > 5. The U-series ages obtained from the banded travertine deposits perturbed by the earthquakes are in the range of 130.59–112.94 ka, indicating an important fault-assisted neotectonic activity that occurred during the Middle–Late Pleistocene. Analysis of such structures, in combination with the use of U-series dating methods, can yield a reliable timing of neotectonic activity and provide new evidence for understanding the seismotectonic setting of the Litang area.</p></div>","PeriodicalId":100384,"journal":{"name":"Earthquake Research Advances","volume":"3 3","pages":"Article 100215"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49703891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research progress in geophysical exploration of the Antarctic ice sheet 南极冰盖地球物理探测研究进展

Earthquake Research Advances Pub Date : 2023-07-01 DOI: 10.1016/j.eqrea.2022.100203

Jinkai An , Song Huang , Xiangyang Chen , Tao Xu , Zhiming Bai

{"title":"Research progress in geophysical exploration of the Antarctic ice sheet","authors":"Jinkai An , Song Huang , Xiangyang Chen , Tao Xu , Zhiming Bai","doi":"10.1016/j.eqrea.2022.100203","DOIUrl":"https://doi.org/10.1016/j.eqrea.2022.100203","url":null,"abstract":"<div><p>The Antarctic ice sheet is an important target of Antarctic research. Thickness and structure, including intraice and subice, are closely related to the mass balance of the ice sheet, and play an important role in the study of global sea level and climate change. Subglacial topography is an important basis for studying ice sheet dynamics and ice sheet evolution. This paper briefly reviews the geophysical detection methods and research status of the Antarctic ice sheet: (1) Conventional methods such as ice radar are the main methods for studying the ice sheet today, and passive source seismic methods such as the receiver function method, H/V method and P-wave coda autocorrelation method have good development prospects; (2) the high-resolution (1 km) ice thickness and subglacial topographic database BEDMAP2 established based on various data has greatly improved the ability to detect internal isochronous layers, anisotropic layers, and temperature changes within ice and has advanced research on ice sheet evolution; and (3) ice radar, numerical simulation and core drilling are the main methods to study subglacial lakes and sediments. More than 400 subglacial lakes have been confirmed, and more than 12 000 simulation results have been obtained. Research on the Antarctic ice sheet faces enormous challenges and is of great urgency. Aiming at hot issues, such as Antarctic geological evolution, glacial retreat, ice sheet melting and their relationships with global climate change, it is the frontier and trend of future Antarctic ice sheet research to carry out multidisciplinary and multicountry comprehensive geophysical exploration based on the traditional ice radar method combined with passive seismic methods, especially new technologies such as short-period dense array technology, unmanned aerial vehicles and artificial intelligence. This is expected to further promote Antarctic research.</p></div>","PeriodicalId":100384,"journal":{"name":"Earthquake Research Advances","volume":"3 3","pages":"Article 100203"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49703832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influences of across-strike heterogeneous viscosity on the earthquake cycle in a three-dimensional strike-slip fault model 三维走滑断层模型中跨走向非均质黏度对地震旋回的影响

Earthquake Research Advances Pub Date : 2023-07-01 DOI: 10.1016/j.eqrea.2023.100218

Peng Zhai , Feng Li , Jinshui Huang

{"title":"Influences of across-strike heterogeneous viscosity on the earthquake cycle in a three-dimensional strike-slip fault model","authors":"Peng Zhai , Feng Li , Jinshui Huang","doi":"10.1016/j.eqrea.2023.100218","DOIUrl":"https://doi.org/10.1016/j.eqrea.2023.100218","url":null,"abstract":"<div><p>Geodetic observations have shown that there exist large differences in the viscosity of the deep lithosphere across many large strike-slip faults. Heterogeneity in lithospheric viscosity structure can influence the efficiency of stress transfer and thus may have a significant effect on the earthquake cycle. Until now, how the lateral viscosity variation across strike-slip faults affects the earthquake cycles is still not well understood. Here, we investigate the effects of across-strike viscosity variation on long-term earthquake behaviors with a three-dimensional strike-slip fault model. Our model is a quasi-static model which is controlled by the slip-weakening friction law and power-law rheology. By comparing with the reference case, we find that low viscosity on one side of the fault results in a smaller rupture area but with a higher Coulomb stress drop on the ruptured fault region. In addition, low viscosity also leads to a small Coulomb stress accumulation rate. These combined effects increase the earthquake recurrence interval by approximately 10% and the earthquake moments by about 30% when the low viscosity is related to a geothermal gradient of 30 K/km. In addition, across-strike viscosity variation causes asymmetric interseismic ground surface deformation rate. As the viscosity contrast increases, the difference in the interseismic ground surface deformation rate between the two sides of the fault gradually increases, although the asymmetric feature is not pronounced. This asymmetry of interseismic ground deformation rate across a strike-slip fault is supposed to result in asymmetric coseismic deformation if the long-term plate motion velocity is invariant. As a result, this kind of asymmetry of interseismic deformation may influence the evaluation of potential earthquake hazards along large strike-slip faults with lateral viscosity contrast.</p></div>","PeriodicalId":100384,"journal":{"name":"Earthquake Research Advances","volume":"3 3","pages":"Article 100218"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49703961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Earthquake-triggered landslide interpretation model of high resolution remote sensing imageries based on bag of visual word 基于视觉字袋的高分辨率遥感影像地震诱发滑坡解译模型

Earthquake Research Advances Pub Date : 2023-04-01 DOI: 10.1016/j.eqrea.2022.100196

Ruyue Bai , Zegen Wang , Heng Lu , Chen Chen , Xiuju Liu , Guohao Deng , Qiang He , Zhiming Ren , Bin Ding , Xin Ye

{"title":"Earthquake-triggered landslide interpretation model of high resolution remote sensing imageries based on bag of visual word","authors":"Ruyue Bai , Zegen Wang , Heng Lu , Chen Chen , Xiuju Liu , Guohao Deng , Qiang He , Zhiming Ren , Bin Ding , Xin Ye","doi":"10.1016/j.eqrea.2022.100196","DOIUrl":"https://doi.org/10.1016/j.eqrea.2022.100196","url":null,"abstract":"<div><p>Traditional visual interpretation is often inefficient due to its excessively workload professional knowledge and strong subjectivity. Therefore, building an automatic interpretation model on high spatial resolution remote sensing images is the key to the quick and efficient interpretation of earthquake-triggered landslides. Aiming at addressing this problem, a landslide interpretation model of high-resolution images based on bag of visual word (BoVW) feature was proposed. The high-resolution images were pre-processed, and then BoVW feature and support vector machine (SVM) was adopted to establish an automatic landslide interpretation model. This model was further compared with the currently widely used Histogram of Oriented Gradient(HoG) feature extraction model. In order to test the effectiveness of the method, typical landslide images were selected to construct a landslide sample library, which was subsequently utilized as the foundation for conducting an experimental study. The results show that the accuracy of landslide extraction using this method reaches as high as 89%, indicating that the method can be used for the automatic interpretation of landslides in disaster-prone areas, and has high practical value for regional disaster prevention and damage reduction.</p></div>","PeriodicalId":100384,"journal":{"name":"Earthquake Research Advances","volume":"3 2","pages":"Article 100196"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49708522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0