Acta Geodynamica et Geomaterialia最新文献_第7页

Type analysis of laboratory seismic events by convolutional neural network 卷积神经网络在实验室地震事件类型分析中的应用

IF 0.9 4区地球科学

Acta Geodynamica et Geomaterialia Pub Date : 2021-05-04 DOI: 10.13168/AGG.2021.0019

P. Kolář

{"title":"Type analysis of laboratory seismic events by convolutional neural network","authors":"P. Kolář","doi":"10.13168/AGG.2021.0019","DOIUrl":"https://doi.org/10.13168/AGG.2021.0019","url":null,"abstract":"In this work, we successfully identified seismic events (observations of earthquakes) in seismograms using a Convolutional Neural Network (CNN). In accordance with past (analogue) seismogram interpretations, we did not treat digital seismograms as a time series, as per the general method, but, rather, converted them into time snaps of continuous data flow. Multichannel seismograms were represented with a time-frequency domain in the form of multilayer images, with each signal channel forming one image layer. Images were then exposed to CNN (composed of three convolutional blocks whose architecture design was justified using Bayesian optimization). To improve reliability, we evaluated the posterior type function (PTP) as a combination of the probabilities of all of the considered classes of signal types (five in our case) which increased robustness of the identification. For data, we used records of acoustic emission (AE) events. The events were generated during laboratory loading experiments originally performed to study material/rock properties. As known, AE events may be studied in the same manner as natural earthquakes and treated in other ways as laboratory earthquake models. AE events are less complex compared to natural earthquakes where many of the physical parameters are known or may be controlled. Based on our results, we concluded that the successful identification of AE events is a necessary step prior to applying the proposed methodology for identifying natural earthquakes in seismograms.","PeriodicalId":50899,"journal":{"name":"Acta Geodynamica et Geomaterialia","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46963455","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: 1

Macro-mechnical charakteristics and their control on the strenght of sandstones of western Indo-Burmese Rangers, NE India 印度东北部印缅游骑兵西部砂岩的宏观力学特征及其对强度的控制

IF 0.9 4区地球科学

Acta Geodynamica et Geomaterialia Pub Date : 2021-04-30 DOI: 10.13168/AGG.2021.0017

Raghupratim Rakshit

引用次数: 1

Recent local geodynamic processes in the Penola Strait_Lemaire Channel fault area (West Antarctica) 西南极洲Penola海峡- lemaire海峡断裂带近期局部地球动力学过程

IF 0.9 4区地球科学

Acta Geodynamica et Geomaterialia Pub Date : 2021-04-27 DOI: 10.13168/AGG.2021.0018

I. Savchyn

{"title":"Recent local geodynamic processes in the Penola Strait_Lemaire Channel fault area (West Antarctica)","authors":"I. Savchyn","doi":"10.13168/AGG.2021.0018","DOIUrl":"https://doi.org/10.13168/AGG.2021.0018","url":null,"abstract":"We present the crustal deformation field in the Penola Strait – Lemaire Channel fault area (West Antarctica), based on the analysis of the 5 seasonal cycles of static GNSS survey. This 5 GNSS campaigns were conducted with approximately a 16-year interval from 2003 to 2019. The analyses indicate that average linear velocities of horizontal movements are multidirectional but no larger than 1 – 2 mm/yr. Average linear velocities of vertical movements are no larger than ±3 mm/yr. In the present work scheme of vertical and horizontal movements has been drawn out. The obtained results correlate well with the movements of the surrounding GNSS stations. Based on the analysis of spatial distribution of the Earth’s surface dilatation velocity the zones of extreme compression and expansion values were revealed. The analyses of spatial distribution of the Earth’s surface total shear velocity indicate that the studied region is horizontally heterogeneous. Based on the analysis of obtained results, a new kinematic model of fault area was developed. The possibility of using static GNSS survey to study recent local geodynamic processes in Antarctica has been demonstrated.","PeriodicalId":50899,"journal":{"name":"Acta Geodynamica et Geomaterialia","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47863579","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: 3

Assessment and identification of three types of difficult soils 三种难处理土壤的评价与鉴定

IF 0.9 4区地球科学

Acta Geodynamica et Geomaterialia Pub Date : 2021-04-21 DOI: 10.13168/AGG.2021.0015

T. Ayadat

{"title":"Assessment and identification of three types of difficult soils","authors":"T. Ayadat","doi":"10.13168/AGG.2021.0015","DOIUrl":"https://doi.org/10.13168/AGG.2021.0015","url":null,"abstract":"The soil engineer needs to be able to readily identify difficult or problematic soils and to determine the amount of settlement that may occur. This paper deals with the assessment and identification of three types of difficult soils: collapsible soils, swelling soils, and liquefiable soils. In the first instance, the study investigates the effect of some soil properties on wetting-induced collapse strain and the swelling potential of soils. Also, two new methods for predicting soil collapse and swelling potential are developed. The proposed relationships correlate between collapse strain and swelling potential and some soil parameters which are believed to govern soil collapse and swelling. Validation of these two relationships with some data reported in literature is also examined. Furthermore, the paper describes the different steps suggested in a new procedure for soil liquefaction assessment. The procedure was presented in the form of an evaluation guide. In addition, a relationship was suggested for computing the potential for liquefaction. An application of the proposed procedure to a practical case is included in order to validate and illustrate the different steps to be followed in the suggested evaluation procedure. ARTICLE INFO","PeriodicalId":50899,"journal":{"name":"Acta Geodynamica et Geomaterialia","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48037585","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

Distribution of metallogenic zones of the Caucasus region originated as a result of the subduction of the lithosphere of the Tethys Paleo-Oceanic plate under the East-European Paleo-Continental plate 高加索地区成矿带的分布源于特提斯古大洋板块岩石圈俯冲到东欧古大陆板块之下

IF 0.9 4区地球科学

Acta Geodynamica et Geomaterialia Pub Date : 2021-04-18 DOI: 10.13168/AGG.2021.0014

A. Kharitonov

引用次数: 0

Identification of ground instability in the housing estate complex based on georadar and satellite radar interferometry 基于georadar和卫星雷达干涉测量法的住宅小区地面不稳定性识别

IF 0.9 4区地球科学

Acta Geodynamica et Geomaterialia Pub Date : 2021-04-16 DOI: 10.13168/AGG.2021.0016

F. Hubatka

引用次数: 2

Application of microgravity and electrical resistivity imaging techniques to identify ground subsidence prone zone 应用微重力和电阻率成像技术识别地面沉降易发区

IF 0.9 4区地球科学

Acta Geodynamica et Geomaterialia Pub Date : 2021-04-07 DOI: 10.13168/AGG.2021.0011

M. Mohammed

{"title":"Application of microgravity and electrical resistivity imaging techniques to identify ground subsidence prone zone","authors":"M. Mohammed","doi":"10.13168/AGG.2021.0011","DOIUrl":"https://doi.org/10.13168/AGG.2021.0011","url":null,"abstract":"Owing to the disastrous consequences of ground subsidence in the urban area, great attention had always been accorded to areas with suspected signs of subsidence occurrence in order to mitigate its effect. Microgravity and electrical resistivity imaging (ERI) survey techniques were conducted at a parking lot of which possible occurrence of subsidence is anticipated due to the increased exposure of surface cracks and very slight depression. This study aimed to map and delineate the subsurface condition of the area with the view of revealing probable subsidence prone zones within the study area. To this end, the microgravity survey data was acquired at a station interval of 2 m. Pole-dipole configuration with 2 m electrode separation was adopted for the electrical resistivity imaging survey. The two methods showed good correlation with each other and proved their effectiveness in imaging the subsurface. A large proportion of the subsurface area was found to be residual soil (mainly silt and or clayey sand) with saturated zones identified by low gravity (< - 40.94 mGal) and resistivity (<150 Ω.m) values, which have the tendency to undergo expansion and contraction processes due to rise and fall in moisture content. The subsurface condition was found to be relatively stable, devoid of any subsidence triggering features such as voids or cavities. However, it is inferred to be unsuitable for engineering structures due to the expansive and contractive properties of the subsurface geomaterials (residual soil). Therefore, it is concluded that the area is not prone to subsidence and the surface cracks presents are mere effects of the expansion and contraction process, which could be avoided by the excavation of the expansive soil or good engineering design before the establishment of any structure.","PeriodicalId":50899,"journal":{"name":"Acta Geodynamica et Geomaterialia","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43977843","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: 1

Liquefaction potential along with pore water pressure generation of coastal sand of Digha in West Bengal, India 印度西孟加拉邦迪加海岸沙的液化潜力和孔隙水压力的产生

IF 0.9 4区地球科学

Acta Geodynamica et Geomaterialia Pub Date : 2021-04-06 DOI: 10.13168/AGG.2021.0012

Pinak Ray

{"title":"Liquefaction potential along with pore water pressure generation of coastal sand of Digha in West Bengal, India","authors":"Pinak Ray","doi":"10.13168/AGG.2021.0012","DOIUrl":"https://doi.org/10.13168/AGG.2021.0012","url":null,"abstract":"Stress controlled cyclic triaxial tests have been done on coastal sand of Digha, West Bengal, India, at different frequencies, confining pressures, and relative densities and cyclic stress ratios. Number of cycles for initial liquefaction (NL) has been determined for that number of cycle when excess pore pressure ratio has become equal to 1. Significant influences of density of sand, confining pressure and number of cycles for initial liquefaction on coastal Digha sand have been found. The test results have shown that increasing density of sand increases liquefaction potential, whereas cyclic strength of sand decreases with increase of confining pressure. An empirical correlation has been developed on cyclic strength of sand based on these parameters and this correlation fits quite well with the observed experimental results. Bender Element tests have been performed to determine maximum shear modulus (Gmax) of Digha sand at different densities and confining pressures. A high correlation coefficient between cyclic strength and Gmax of Digha sand at any NL has been found. A new pore water pressure generation model has been introduced for this sand along with upper bound and lower bound curves to predict excess pore water pressure build up due to seismic loads. ARTICLE INFO","PeriodicalId":50899,"journal":{"name":"Acta Geodynamica et Geomaterialia","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43491001","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

Landslide susceptibility assessment along the Dubair-Dudishal section of the Karakoram Highway, Northwestern Himalayas, Pakistan 巴基斯坦喜马拉雅山脉西北部喀喇昆仑公路Dubair-Dudishal路段滑坡易发性评估

IF 0.9 4区地球科学

Acta Geodynamica et Geomaterialia Pub Date : 2021-04-06 DOI: 10.13168/AGG.2021.0010

J. Iqbal

{"title":"Landslide susceptibility assessment along the Dubair-Dudishal section of the Karakoram Highway, Northwestern Himalayas, Pakistan","authors":"J. Iqbal","doi":"10.13168/AGG.2021.0010","DOIUrl":"https://doi.org/10.13168/AGG.2021.0010","url":null,"abstract":"The primary objective of this study is to analyze and characterize landslides in North Pakistan along Karakoram Highway (KKH) to produce a landslide susceptibility map using GIS and remote sensing technology. Using satellite images followed by field investigations, spatial distribution of landslide database was generated. Next, an integrated study was undertaken in the study area to perform the landslide susceptibility mapping. Dubaur-Dudishal section of KKH (about 150 km) which is a part of Kohistan Island Arc, is investigated in this study with a buffer zone of about 8 km along both sides of the KKH. Several thematic maps, e.g., lithology, distance to faults, distance to streams, distance to roads, normalized difference vegetation index (NDVI), slope, aspect, elevation, relative relief, plan-curvature and profile-curvature were prepared. Subsequently, these thematic data layers were analyzed by frequency ratio (FR) model and weights-of-evidence (WoE) model to generate the landslide susceptibility maps. In order to check the accuracy of the models, the area under the curve (AUC) was to quantitatively compare the two models used in this study. The predictive ability of AUC values indicate that the success rates of FR model and WoE model are 0.807 and 0.866, whereas the prediction rates are 0.785 and 0.846, respectively. Both methods show that nearly 50 % landslides in the study area fall in either high or very high susceptibility zones. The landslide susceptibility maps presented in this study are of great importance to the policy makers and the engineers for highway construction as well as the mega dams construction projects (Dasu dam and Bhasha dam which lie within the vicinity of the study area); so that proper prevention as well as mitigation could be done in advance to avoid the possible economic as well as the human loss in future. ARTICLE INFO","PeriodicalId":50899,"journal":{"name":"Acta Geodynamica et Geomaterialia","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48622054","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: 1

Paleostress and outcrop fracture analysis along Himalayan Foothills (Eastern Salt Range), Potwar Plateau, NW Himalaya, Pakistan 巴基斯坦西北喜马拉雅Potwar高原喜马拉雅山麓(东部盐岭)古应力和露头断裂分析

IF 0.9 4区地球科学

Acta Geodynamica et Geomaterialia Pub Date : 2021-03-25 DOI: 10.13168/AGG.2021.0013

Hassan Mehmood

{"title":"Paleostress and outcrop fracture analysis along Himalayan Foothills (Eastern Salt Range), Potwar Plateau, NW Himalaya, Pakistan","authors":"Hassan Mehmood","doi":"10.13168/AGG.2021.0013","DOIUrl":"https://doi.org/10.13168/AGG.2021.0013","url":null,"abstract":"The Salt Range (SR) is an ENE-WSW trending fault bend fold that form the range front of the Himalayan fold and thrust belt in Pakistan. The research is carried out in the Eastern Salt Range (ESR) with the objective to determine the paleostress inversion from reduced stress tensors by using fracture data. The surface morphology of the fold is predominantly shaped by Eocene limestone that provide best exposure of joint surfaces that can be used for kinematic and dynamic analysis. We adopted a classical circle inventory method in the field and collected orientation data (dip amount, direction, and strike) from 7 localities (outcrop stations) of the Eocene Sakesar Limestone. Three prominent fracture trends are present in the study area namely, FS-1; (E-W), FS-2; (ENE-WSW) and FS-3; (NNE-SSW). For stress analysis and data processing we used the Tensor Program of Delvaux and Sperner (2003) and calculated seven stress fields by the Right Dihedron Method. The orientations of the principal stress axes (ϭ1, ϭ2, ϭ3) and Stress Ratio (R) depicts ϭ1(Shmax) and ϭ2 are sub-horizontal while ϭ3 is vertical in all stress tensors. The paleostress results show that ϭ1(Shmax) oriented NNE-SSW belonging to a compressive regime. It is suggested that ϭ1 developed more or less perpendicular to the trend of SRT and other relevant structures in the Potwar Plateau.","PeriodicalId":50899,"journal":{"name":"Acta Geodynamica et Geomaterialia","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47727320","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