Earthquake Research Advances最新文献

{"title":"A case-based reasoning method of recognizing liquefaction pits induced by 2021 MW 7.3 Madoi earthquake","authors":"Peng Liang ,&nbsp;Yueren Xu ,&nbsp;Wenqiao Li ,&nbsp;Yanbo Zhang ,&nbsp;Qinjian Tian","doi":"10.1016/j.eqrea.2022.100182","DOIUrl":"https://doi.org/10.1016/j.eqrea.2022.100182","url":null,"abstract":"<div><p>Earthquake-triggered liquefaction deformation could lead to severe infrastructure damage and associated casualties and property damage. At present, there are few studies on the rapid extraction of liquefaction pits based on high-resolution satellite images. Therefore, we provide a framework for extracting liquefaction pits based on a case-based reasoning method. Furthermore, five covariates selection methods were used to filter the 11 covariates that were generated from high-resolution satellite images and digital elevation models (DEM). The proposed method was trained with 450 typical samples which were collected based on visual interpretation, then used the trained case-based reasoning method to identify the liquefaction pits in the whole study area. The performance of the proposed methods was evaluated from three aspects, the prediction accuracies of liquefaction pits based on the validation samples by kappa index, the comparison between the pre- and post-earthquake images, the rationality of spatial distribution of liquefaction pits. The final result shows the importance of covariates ranked by different methods could be different. However, the most important of covariates is consistent. When selecting five most important covariates, the value of kappa index could be about 96%. There also exist clear differences between the pre- and post-earthquake areas that were identified as liquefaction pits. The predicted spatial distribution of liquefaction is also consistent with the formation principle of liquefaction.</p></div>","PeriodicalId":100384,"journal":{"name":"Earthquake Research Advances","volume":"3 1","pages":"Article 100182"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49704175","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}

{"title":"Real-time prediction of earthquake potential damage: A case study for the January 8, 2022 MS 6.9 Menyuan earthquake in Qinghai, China","authors":"Jindong Song ,&nbsp;Jingbao Zhu ,&nbsp;Yongxiang Wei ,&nbsp;Shuilong Li ,&nbsp;Shanyou Li","doi":"10.1016/j.eqrea.2022.100197","DOIUrl":"https://doi.org/10.1016/j.eqrea.2022.100197","url":null,"abstract":"<div><p>It is critical to determine whether a site has potential damage in real-time after an earthquake occurs, which is a challenge in earthquake disaster reduction. Here, we propose a real-time <strong>E</strong>arthquake <strong>P</strong>otential <strong>D</strong>amage predict<strong>or</strong> (EPDor) based on predicting peak ground velocities (PGVs) of sites. The EPDor is composed of three parts: (1) predicting the magnitude of an earthquake and PGVs of triggered stations based on the machine learning prediction models; (2) predicting the PGVs at distant sites based on the empirical ground motion prediction equation; (3) generating the PGV map through predicting the PGV of each grid point based on an interpolation process of weighted average based on the predicted values in (1) and (2). We apply the EPDor to the 2022 <em>M</em>_S 6.9 Menyuan earthquake in Qinghai Province, China to predict its potential damage. Within the initial few seconds after the first station is triggered, the EPDor can determine directly whether there is potential damage for some sites to a certain degree. Hence, we infer that the EPDor has potential application for future earthquakes. Meanwhile, it also has potential in Chinese earthquake early warning system.</p></div>","PeriodicalId":100384,"journal":{"name":"Earthquake Research Advances","volume":"3 1","pages":"Article 100197"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49703899","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}

{"title":"Rapid report of June 1, 2022 MW 5.9 Lushan earthquake, China with geodetic and teleseismic data","authors":"Lei Xie ,&nbsp;Nan Fang ,&nbsp;Xiaoge Liu ,&nbsp;Wenbin Xu","doi":"10.1016/j.eqrea.2022.100172","DOIUrl":"https://doi.org/10.1016/j.eqrea.2022.100172","url":null,"abstract":"<div><p>Timely response to earthquake characterization can facilitate earthquake emergency rescue and further scientific investigations. On June 1, 2022, <em>M</em>_W 5.9 earthquake occurred in the southern area of the Longmenshan fault zone. This event also happened at the south end of the Dayi seismic gap and is the largest earthquake that has occurred in this seismic gap since the 1970 <em>M</em> 6.2 event. The slip-distribution model constrained by the seismic waveforms suggests a thrust-dominated faulting mechanism. The main slip occurs at a depth of ∼14 ​km, and the cumulative energy is released in the first 6 ​s. The variations of Coulomb stress caused by the mainshock show a positive change in the southwest area of the Dayi seismic gap, indicating possible activation of future earthquakes. In addition, we emphasize the importance of rapid estimation of deformation for near-field hazard delineation, especially when interferometric radar fails to image coseismic deformation in a high relief terrain.</p></div>","PeriodicalId":100384,"journal":{"name":"Earthquake Research Advances","volume":"3 1","pages":"Article 100172"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49703925","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}

{"title":"A 15-year-Long catalog of seismicity in the Eastern Tennessee Seismic Zone (ETSZ) using matched filter detection","authors":"Clara Daniels ,&nbsp;Zhigang Peng","doi":"10.1016/j.eqrea.2022.100198","DOIUrl":"https://doi.org/10.1016/j.eqrea.2022.100198","url":null,"abstract":"<div><p>We present a detailed catalog of 13 671 earthquakes in the Eastern Tennessee Seismic Zone (ETSZ) that spans January 1, 2005 to July 31, 2020. We apply a matched filter detection technique on over 15 years of continuous data, resulting in arguably the most complete catalog of seismicity in the ETSZ yet. The magnitudes of newly detected events are determined by computing the amplitude ratio between the detections and templates using a principal component fit. We also compute the b-value for the new catalog and comparatively relocate a subset of newly detected events using XCORLOC and hypoDD, which shows a more defined structure at depth. We find the greatest concentration along and to the east of the New York-Alabama Lineament, as defined by the magnetic anomaly, supporting the argument that this feature likely is related to the generation of seismicity in the ETSZ. We examine seismicity in the vicinity of the Watts Bar Reservoir, which is located about 5 ​km from the epicenter of the <em>M</em>_W 4.4 December 12, 2018 Decatur, Tennessee earthquake, and find possible evidence for reservoir modulated seismicity in this region. We also examine seismicity in the entire ETSZ to search for a correlation between shallow earthquakes and seasonal hydrologic changes. Our results show limited evidence for hydrologically-driven shallow seismicity due to seasonal groundwater levels in the ETSZ, which contradicts previous studies hypothesizing that most intraplate earthquakes are associated with the dynamics of hydrologic cycles.</p></div>","PeriodicalId":100384,"journal":{"name":"Earthquake Research Advances","volume":"3 1","pages":"Article 100198"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49708504","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}

{"title":"An open-accessed inventory of landslides triggered by the MS 6.8 Luding earthquake, China on September 5, 2022","authors":"Yuandong Huang ,&nbsp;Chenchen Xie ,&nbsp;Tao Li ,&nbsp;Chong Xu ,&nbsp;Xiangli He ,&nbsp;Xiaoyi Shao ,&nbsp;Xiwei Xu ,&nbsp;Tao Zhan ,&nbsp;Zhaoning Chen","doi":"10.1016/j.eqrea.2022.100181","DOIUrl":"https://doi.org/10.1016/j.eqrea.2022.100181","url":null,"abstract":"<div><p>This study constructs a preliminary inventory of landslides triggered by the <em>M</em>_S 6.8 Luding earthquake based on field investigation and human-computer interaction visual interpretation on optical satellite images. The results show that this earthquake triggered at least 5 007 landslides, with a total landslide area of 17.36 ​km², of which the smallest landslide area is 65 ​m² and the largest landslide area reaches 120 747 ​m², with an average landslide area of about 3 500 ​m². The obtained landslides are concentrated in the IX intensity zone and the northeast side of the seismogenic fault, and the area density and point density of landslides are 13.8%, and 35.73 ​km⁻² peaks with 2 ​km as the search radius. It should be noted that the number of landslides obtained in this paper will be lower than the actual situation because some areas are covered by clouds and there are no available post-earthquake remote sensing images. Based on the available post-earthquake remote sensing images, the number of landslides triggered by this earthquake is roughly estimated to be up to 10 000. This study can be used to support further research on the distribution pattern and risk evaluation of the coseismic landslides in the region, and the prevention and control of landslide hazards in the seismic area.</p></div>","PeriodicalId":100384,"journal":{"name":"Earthquake Research Advances","volume":"3 1","pages":"Article 100181"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49703960","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}

{"title":"Preliminary results on a near-real-time rock slope damage monitoring system based on relative velocity changes following the September 5, 2022 MS 6.8 Luding, China earthquake","authors":"Fan Xie ,&nbsp;Chen Liang ,&nbsp;Shigui Dai ,&nbsp;Bo Shao ,&nbsp;Huibao Huang ,&nbsp;Jinhui Ouyang ,&nbsp;Li Li ,&nbsp;Eric Larose","doi":"10.1016/j.eqrea.2022.100202","DOIUrl":"https://doi.org/10.1016/j.eqrea.2022.100202","url":null,"abstract":"<div><p>Relative seismic velocity change (d<em>v</em>/<em>v</em>) is important for monitoring changes in subsurface material properties and evaluating earthquake-induced rock slope damage in a geological disaster-prone region. In this paper, we present a rapid damage assessment on three slow-moving rock slopes by measuring d<em>v</em>/<em>v</em> decrease caused by the 2022 ​<em>M_S</em> 6.8 Luding earthquake in Southwest China. By applying the stretching method to the cross-correlated seismic wavefields between sensors installed on each slope, we obtain earthquake-induced d<em>v</em>/<em>v</em> decreases of ∼2.1%, ∼0.5%, and ∼0.2% on three slopes at distances ranging from ∼86 to ∼370 ​km to the epicenter, respectively. Moreover, based on seismic data recorded by 16 sensors deployed on the rock slope at a distance of ∼370 ​km away from the epicenter, a localized d<em>v</em>/<em>v</em> decease region was observed at the crest of the slope by calculating the spatial d<em>v</em>/<em>v</em> images before and after the earthquake. We also derive an empirical in situ stress sensitivity of −7.29✕10⁻⁸/Pa by relating the d<em>v</em>/<em>v</em> change to the measured peak dynamic stresses. Our results indicate that a rapid d<em>v</em>/<em>v</em> assessment not only can help facilitate on-site emergency response to earthquake-induced secondary geological disasters but also can provide a better understanding of the subsurface geological risks under diverse seismic loadings.</p></div>","PeriodicalId":100384,"journal":{"name":"Earthquake Research Advances","volume":"3 1","pages":"Article 100202"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49704296","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}

{"title":"Preliminary report of the September 5, 2022 MS 6.8 Luding earthquake, Sichuan, China","authors":"Yanru An ,&nbsp;Dun Wang ,&nbsp;Qiang Ma ,&nbsp;Yueren Xu ,&nbsp;Yu Li ,&nbsp;Yingying Zhang ,&nbsp;Zhumei Liu ,&nbsp;Chunmei Huang ,&nbsp;Jinrong Su ,&nbsp;Jilong Li ,&nbsp;Mingxiao Li ,&nbsp;Wenkai Chen ,&nbsp;Zhifan Wan ,&nbsp;Dengjie Kang ,&nbsp;Baoshan Wang","doi":"10.1016/j.eqrea.2022.100184","DOIUrl":"https://doi.org/10.1016/j.eqrea.2022.100184","url":null,"abstract":"<div><p>The 2022 <em>M</em>_S 6.8 Luding earthquake is the strongest earthquake in Sichuan Province, Western China, since the 2017 <em>M</em>_S 7.0 Jiuzhaigou earthquake. It occurred on the Moxi fault in the southeastern segment of the Xianshuihe fault, a tectonically active and mountainous region with severe secondary earthquake disasters. To better understand the seismogenic mechanism and provide scientific support for future hazard mitigation, we summarize the preliminary results of the Luding earthquake, including seismotectonic background, seismicity and mainshock source characteristics and aftershock properties, and direct and secondary damage associated with the mainshock. The peak ground displacements in the NS and EW directions observed by the nearest GNSS station SCCM are ∼35 mm and ∼55 mm, respectively, resulting in the maximum coseismic dislocation of 20 mm along the NWW direction, which is consistent with the sinistral slip on the Xianshuihe fault. Back-projection of teleseismic P waves suggest that the mainshock rupture propagated toward south-southeast. The seismic intensity of the mainshock estimated from the back-projection results indicates a Mercalli scale of VIII or above near the ruptured area, consistent with the results from instrumental measurements and field surveys. Numerous aftershocks were reported, with the largest being <em>M</em>_S 4.5. Aftershock locations (up to September 18, 2022) exhibit 3 clusters spanning an area of 100 km long and 30 km wide. The magnitude and rate of aftershocks decreased as expected, and the depths became shallower with time. The mainshock and two aftershocks show left-lateral strike-slip focal mechanisms. For the aftershock sequence, the <em>b</em>-value from the Gutenberg-Richter frequency-magnitude relationship, <em>h</em>-value, and <em>p-</em>value for Omori’s law for aftershock decay are 0.81, 1.4, and 1.21, respectively, indicating that this is a typical mainshock-aftershock sequence. The low <em>b</em>-value implies high background stress in the hypocenter region. Analysis from remote sensing satellite images and UAV data shows that the distribution of earthquake-triggered landslides was consistent with the aftershock area. Numerous small-size landslides with limited volumes were revealed, which damaged or buried the roads and severely hindered the rescue process.</p></div>","PeriodicalId":100384,"journal":{"name":"Earthquake Research Advances","volume":"3 1","pages":"Article 100184"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49704374","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}

{"title":"Research on the influence of grouted sleeves and assembled seams on the deformation and bearing capacity of compression-flexure member","authors":"Hongtao Liu,&nbsp;Pengchao Kong,&nbsp;Zuohu Wang,&nbsp;Weizhang Liao","doi":"10.1016/j.eqrea.2022.100169","DOIUrl":"https://doi.org/10.1016/j.eqrea.2022.100169","url":null,"abstract":"<div><p>Grouted sleeves can effectively connect precast elements, but the effect of grouted sleeves for increased stiffness and assembled seam for weakening stiffness on the precast column's mechanical properties is unclear. Based on the full-scale test results of precast columns connected with grouted sleeves and the correctness of the numerical models, the influence analysis of the individual and coupling action of the grouted sleeves and assembled seam on the deformation and bearing capacity of the precast column is carried out. The research results show that grouted sleeves significantly affect the deformation and peak bearing capacity of precast columns; when precast columns are subjected to the action of high axial pressure, grouted sleeves significantly affect the bearing capacity. However, the influence of assembled seams on the peaking capacity of the precast column is more obvious when it was tested under low axial compression. It is recommended that the connection position should be 2 times the height of the grouted sleeve from the bottom of the foundation.</p></div>","PeriodicalId":100384,"journal":{"name":"Earthquake Research Advances","volume":"2 4","pages":"Article 100169"},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772467022000604/pdfft?md5=157e2da6c2b6c9f34cf402e2f1ad4caa&pid=1-s2.0-S2772467022000604-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137008368","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}

{"title":"Seismic performance of two-story subway station structures with different isolating systems","authors":"Haiyang Zhuang ,&nbsp;Wei Wang ,&nbsp;Liguo Jin ,&nbsp;Sheng Li ,&nbsp;Guoxing Chen","doi":"10.1016/j.eqrea.2022.100155","DOIUrl":"10.1016/j.eqrea.2022.100155","url":null,"abstract":"<div><p>When the sliding bearing is fixed only at the top of the middle column of the underground structure, the cracks at the side end of the middle plate should be aggravated while the seismic damage of the mid-column should be alleviated. To enhance the seismic performance of the mid-plate, a new isolation design method has been mentioned while the elastic sliding bearings are set at the top of the mid-columns and between the side end of the mid-plate and the side wall at the same time. By establishing a nonlinear finite element analysis model for the static-dynamic coupling interaction system, the seismic response characteristics of the cast-in-place station structure without a sliding bearing have been analyzed and compared with those of the station structure with the sliding bearing fixed only at the top of the middle columns, and those of the station structure with sliding bearing be fixed between the mid-plate and the sidewall at the same time. The results show that the new isolation station structures suffer fewer earthquake damages at the mid-plate and mid-columns at the same time, which can improve the overall seismic performance of the subway station structure.</p></div>","PeriodicalId":100384,"journal":{"name":"Earthquake Research Advances","volume":"2 4","pages":"Article 100155"},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S277246702200046X/pdfft?md5=1f7229875dcb04e17e4c7c4e1c8cad25&pid=1-s2.0-S277246702200046X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77241425","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}

{"title":"A comparative analysis of seismic response of shallow buried underground structure under incident P, SV and Rayleigh waves","authors":"Xin Bao ,&nbsp;Jingbo Liu ,&nbsp;Hui Tan ,&nbsp;Shutao Li ,&nbsp;Fei Wang","doi":"10.1016/j.eqrea.2022.100179","DOIUrl":"10.1016/j.eqrea.2022.100179","url":null,"abstract":"<div><p>In this study, A time-domain seismic response analysis method and a calculation model of the underground structure that can realize the input of seismic P, SV and Rayleigh waves are established, based on the viscoelastic artificial boundary elements and the boundary substructure method for seismic wave input. After verifying the calculation accuracy, a comparative study on seismic response of a shallow-buried, double-deck, double-span subway station structure under incident P, SV and Rayleigh waves is conducted. The research results show that there are certain differences in the cross-sectional internal force distribution characteristics of underground structures under different types of seismic waves. The research results show that there are certain differences in the internal force distribution characteristics of underground structures under different types of seismic waves. At the bottom of the side wall, the top and bottom of the center pillar of the underground structure, the section bending moments of the underground structure under the incidences of SV wave and Rayleigh wave are relatively close, and are significantly larger than the calculation result under the incidence of P wave. At the center of the side wall and the top floor of the structure, the peak value of the cross-sectional internal force under the incident Rayleigh wave is larger than the calculation result under SV wave. In addition, the floor of the underground structure under Rayleigh waves vibrates in both the horizontal and vertical directions, and the magnification effect in the vertical direction is more significant. Considering that the current seismic research of underground structures mainly considers the effect of body waves such as the shear waves, sufficient attention should be paid to the incidence of Rayleigh waves in the future seismic design of shallow underground structures.</p></div>","PeriodicalId":100384,"journal":{"name":"Earthquake Research Advances","volume":"2 4","pages":"Article 100179"},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772467022000707/pdfft?md5=b6c3242c26d954e8d85d3ef98f0c333e&pid=1-s2.0-S2772467022000707-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83628408","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}