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Digitized Database of Old Seismograms Recorder in Romania 罗马尼亚旧地震记录数字化数据库
IF 2.3 4区 地球科学
Acta Geophysica Pub Date : 2016-12-02 DOI: 10.1515/acgeo-2016-0039
D. Paulescu, M. Rogozea, M. Popa, M. Radulian
{"title":"Digitized Database of Old Seismograms Recorder in Romania","authors":"D. Paulescu, M. Rogozea, M. Popa, M. Radulian","doi":"10.1515/acgeo-2016-0039","DOIUrl":"https://doi.org/10.1515/acgeo-2016-0039","url":null,"abstract":"The aim of this paper is to describe a managing system for a unique Romanian database of historical seismograms and complementary documentation (metadata) and its dissemination and analysis procedure. For this study, 5188 historical seismograms recorded between 1903 and 1957 by the Romanian seismological observatories (Bucharest-Filaret, Focşani, Bacău, Vrincioaia, Câmpulung-Muscel, Iaşi) were used. In order to reconsider the historical instrumental data, the analog seismograms are converted to digital images and digital waveforms (digitization/ vectorialisation). First, we applied a careful scanning procedure of the seismograms and related material (seismic bulletins, station books, etc.). In a next step, the high resolution scanned seismograms will be processed to obtain the digital/numeric waveforms. We used a Colortrac Smartlf Cx40 scanner which provides images in TIFF or JPG format. For digitization the algorithm Teseo2 developed by the National Institute of Geophysics and Volcanology in Rome (Italy), within the framework of the SISMOS Project, will be used.","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2016-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/acgeo-2016-0039","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67088567","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: 5
Palaeomagnetism of Middle Ordovician Carbonate Sequence, Vaivara Sinimäed Area, Northeast Estonia, Baltica 波罗的海爱沙尼亚东北部Vaivara Sinimäed地区中奥陶世碳酸盐岩层序古地磁
IF 2.3 4区 地球科学
Acta Geophysica Pub Date : 2016-12-02 DOI: 10.1515/acgeo-2016-0066
J. Plado, U. Preeden, A. Jõeleht, L. Pesonen, S. Mertanen
{"title":"Palaeomagnetism of Middle Ordovician Carbonate Sequence, Vaivara Sinimäed Area, Northeast Estonia, Baltica","authors":"J. Plado, U. Preeden, A. Jõeleht, L. Pesonen, S. Mertanen","doi":"10.1515/acgeo-2016-0066","DOIUrl":"https://doi.org/10.1515/acgeo-2016-0066","url":null,"abstract":"The hill range of Vaivara Sinimäed in northeast Estonia consists of several narrow east- to northeast-trending glaciotectonic fold structures. The folds include tilted (dips 4–75°) Middle Ordovician (early Darriwilian) layered carbonate strata that were studied by mineralogical, palaeomagnetic, and rock magnetic methods in order to specify the postsedimentational history of the area and to obtain a better control over the palaeogeographic position of Baltica during the Ordovician. Mineralogical studies revealed that (titano)magnetite, hematite, and goethite are carriers of magnetization. Based on data from 5 sites that positively passed a DC tilt test, a south-easterly downward directed component A (Dref = 154.6°± 15.3°, Iref = 60.9°± 9.7°) was identified. The component is carried by (titano)magnetite, dates to the Middle Ordovician (Plat = 17.9°, Plon = 47.3°, K = 46.7, A95 = 11.3°), and places Baltica at mid-southerly latitudes. Observations suggest that in sites that do not pass the tilt test, the glaciotectonic event has caused some rotation of blocks around their vertical axis.","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2016-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/acgeo-2016-0066","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67090283","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: 5
The Influence of a Local Fault Zone on High Energy Tremor Occurrence During Longwall Mining of a Coal Seam 局部断裂带对煤层长壁开采中高能震颤发生的影响
IF 2.3 4区 地球科学
Acta Geophysica Pub Date : 2016-12-02 DOI: 10.1515/acgeo-2016-0040
Ł. Wojtecki, M. Knopik, W. Zuberek
{"title":"The Influence of a Local Fault Zone on High Energy Tremor Occurrence During Longwall Mining of a Coal Seam","authors":"Ł. Wojtecki, M. Knopik, W. Zuberek","doi":"10.1515/acgeo-2016-0040","DOIUrl":"https://doi.org/10.1515/acgeo-2016-0040","url":null,"abstract":"Underground mining of coal seams in the Upper Silesian Coal Basin in Poland is accompanied by seismic activity of varying magnitude. The investigations which have been performed for several years distinguished high energy mine tremors connected directly with mining or coupled with geological structures, such as large faults. In mined seams, local fault zones occur. Faults in these zones are usually small, with throws comparable with coal seams thicknesses. Local fault zone may be responsible for the occurrence of high energy tremors as well as large faults, as presented in this article. An analysis of source mechanism of high energy tremors generated during longwall mining of the coal seam No. 510, with presence of a local fault zone, in one of the Polish hard coal mines in the Upper Silesian Coal Basin was performed. For this purpose, the seismic moment tensor inversion method was used. In most of foci, the process of shear predominated. Determined nodal plane parameters were correlated with parameters of faults forming the local fault zone. High energy tremors were generated mostly by dislocations on faults of the local fault zone. Weakening of roof rocks in the neighborhood of local fault zone takes an important role too, and was responsible for share of implosion in the focal mechanism.","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2016-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/acgeo-2016-0040","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67088663","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: 10
Some Probabilistic and Statistical Properties of the Seismic Regime of Zemmouri (Algeria) Seismoactive Zone 泽穆里(阿尔及利亚)地震活动性带地震动态的一些概率和统计性质
IF 2.3 4区 地球科学
Acta Geophysica Pub Date : 2016-12-02 DOI: 10.1515/acgeo-2016-0049
K. Baddari, F. Bellalem, I. Baddari, Said Makdeche
{"title":"Some Probabilistic and Statistical Properties of the Seismic Regime of Zemmouri (Algeria) Seismoactive Zone","authors":"K. Baddari, F. Bellalem, I. Baddari, Said Makdeche","doi":"10.1515/acgeo-2016-0049","DOIUrl":"https://doi.org/10.1515/acgeo-2016-0049","url":null,"abstract":"Statistical tests have been used to adjust the Zemmouri seismic data using a distribution function. The Pareto law has been used and the probabilities of various expected earthquakes were computed. A mathematical expression giving the quantiles was established. The extreme values limiting law confirmed the accuracy of the adjustment method. Using the moment magnitude scale, a probabilistic model was made to predict the occurrences of strong earthquakes. The seismic structure has been characterized by the slope of the recurrence plot γ, fractal dimension D, concentration parameter Ksr, Hurst exponents Hr and Ht. The values of D, γ, Ksr, Hr, and Ht diminished many months before the principal seismic shock (M = 6.9) of the studied seismoactive zone has occurred. Three stages of the deformation of the geophysical medium are manifested in the variation of the coefficient G% of the clustering of minor seismic events.","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2016-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/acgeo-2016-0049","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67089777","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: 2
Influence of Elevation Data Source on 2D Hydraulic Modelling 高程数据源对二维水力建模的影响
IF 2.3 4区 地球科学
Acta Geophysica Pub Date : 2016-12-02 DOI: 10.1515/acgeo-2016-0030
K. Bakuła, Mateusz StĘpnik, Z. Kurczynski
{"title":"Influence of Elevation Data Source on 2D Hydraulic Modelling","authors":"K. Bakuła, Mateusz StĘpnik, Z. Kurczynski","doi":"10.1515/acgeo-2016-0030","DOIUrl":"https://doi.org/10.1515/acgeo-2016-0030","url":null,"abstract":"The aim of this paper is to analyse the influence of the source of various elevation data on hydraulic modelling in open channels. In the research, digital terrain models from different datasets were evaluated and used in two-dimensional hydraulic models. The following aerial and satellite elevation data were used to create the representation of terrain–digital terrain model: airborne laser scanning, image matching, elevation data collected in the LPIS, EuroDEM, and ASTER GDEM. From the results of five 2D hydrodynamic models with different input elevation data, the maximum depth and flow velocity of water were derived and compared with the results of the most accurate ALS data. For such an analysis a statistical evaluation and differences between hydraulic modelling results were prepared. The presented research proved the importance of the quality of elevation data in hydraulic modelling and showed that only ALS and photogrammetric data can be the most reliable elevation data source in accurate 2D hydraulic modelling.","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2016-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/acgeo-2016-0030","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67088509","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: 9
Hybrid-Empirical Ground Motion Estimations for Georgia 格鲁吉亚混合经验地面运动估计
IF 2.3 4区 地球科学
Acta Geophysica Pub Date : 2016-12-02 DOI: 10.1515/acgeo-2016-0048
N. Tsereteli, A. Askan, H. Hamzehloo
{"title":"Hybrid-Empirical Ground Motion Estimations for Georgia","authors":"N. Tsereteli, A. Askan, H. Hamzehloo","doi":"10.1515/acgeo-2016-0048","DOIUrl":"https://doi.org/10.1515/acgeo-2016-0048","url":null,"abstract":"Ground motion prediction equations are essential for several purposes ranging from seismic design and analysis to probabilistic seismic hazard assessment. In seismically active regions without sufficiently strong ground motion data to build empirical models, hybrid models become vital. Georgia does not have sufficiently strong ground motion data to build empirical models. In this study, we have applied the host-totarget method in two regions in Georgia with different source mechanisms. According to the tectonic regime of the target areas, two different regions are chosen as host regions. One of them is in Turkey with the dominant strike-slip source mechanism, while the other is in Iran with the prevalence of reverse-mechanism events. We performed stochastic finite-fault simulations in both host and target areas and employed the hybrid-empirical method as introduced in Campbell (2003). An initial set of hybrid empirical ground motion estimates is obtained for PGA and SA at selected periods for Georgia.","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2016-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/acgeo-2016-0048","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67089774","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: 5
Recent Efforts Toward the Establishment of the Lonjsko Polje Geomagnetic Observatory 为建立Lonjsko Polje地磁观测站所作的最新努力
IF 2.3 4区 地球科学
Acta Geophysica Pub Date : 2016-12-02 DOI: 10.1515/acgeo-2016-0051
I. Mandić, Eugen Vujić, B. Heilig, I. Pelajić, D. Herak
{"title":"Recent Efforts Toward the Establishment of the Lonjsko Polje Geomagnetic Observatory","authors":"I. Mandić, Eugen Vujić, B. Heilig, I. Pelajić, D. Herak","doi":"10.1515/acgeo-2016-0051","DOIUrl":"https://doi.org/10.1515/acgeo-2016-0051","url":null,"abstract":"More than ten years ago, the Geophysical Institute initiated the installation of a geomagnetic observatory in Croatia. Over the past decade, extensive surveys and studies have been conducted in order to determine the proper location for the observatory. Finally, in 2012, the observatory was established in Lonjsko Polje. This paper presents the first data recorded in the period 2012.5-2015.0. Also presented are the technical aspects and data processing techniques of this remotely operated observatory. Analysis of data quality and comparison with data from the surrounding INTERMAGNET observatories is discussed in detail. Although remote observatories cannot provide the ideal environment for magnetometers, the obtained results accentuate the potential of the new observatory to provide high-quality data. The establishment of this observatory paves the way for scientific and professional development of geomagnetism in Croatia.","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2016-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/acgeo-2016-0051","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67089817","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: 4
Application of Multichannel Analysis of Surface Waves to S-Phase Wave Anisotropy Estimation 多通道表面波分析在s相波各向异性估计中的应用
IF 2.3 4区 地球科学
Acta Geophysica Pub Date : 2016-12-02 DOI: 10.1515/acgeo-2016-0058
I. Stan-Kłeczek, M. Mendecki
{"title":"Application of Multichannel Analysis of Surface Waves to S-Phase Wave Anisotropy Estimation","authors":"I. Stan-Kłeczek, M. Mendecki","doi":"10.1515/acgeo-2016-0058","DOIUrl":"https://doi.org/10.1515/acgeo-2016-0058","url":null,"abstract":"The Multichannel Analysis of Surface Waves (MASW) is an increasingly used technique for recognition of a shallow geological structure and estimation of geotechnical parameters, e.g., S-wave velocity, layer density, layer thickness, shear modulus, estimated P-wave velocity, and estimated Poisson ratio. MASW surveys were carried out in two limestone quarries in the southern part of Poland. The experimental areas are characterised by a simple geological structure: consolidated Triassic limestone. Measurement profiles were arranged as a shapely six-pointed star. For each survey line, 12 geophones with 2-meter (Deposit 1) and 3-meter (Deposit 2) spacing were applied. The research allowed to compare P- and S-wave velocity changes with the main crack systems in the studied rock masses.","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2016-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/acgeo-2016-0058","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67090032","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
New Relations of Water Saturation’s Calculus from Well Logs 测井资料中含水饱和度计算的新关系
IF 2.3 4区 地球科学
Acta Geophysica Pub Date : 2016-12-02 DOI: 10.1515/acgeo-2016-0063
I. Malureanu, T. Boaca, D. Neagu
{"title":"New Relations of Water Saturation’s Calculus from Well Logs","authors":"I. Malureanu, T. Boaca, D. Neagu","doi":"10.1515/acgeo-2016-0063","DOIUrl":"https://doi.org/10.1515/acgeo-2016-0063","url":null,"abstract":"The saturation in water or hydrocarbon is an important petrophysical parameter used for the evaluation of oil and gas reservoirs. It represents the amount of hydrocarbons in a reservoir. There are many relations to determine the water saturation from well logs by using the physical properties of rocks. The accurate determination of the hydrocarbon formation or the water saturation is given by the accuracy of the parameters used for calculating and by the relations used.","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2016-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/acgeo-2016-0063","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67090397","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
Tectonic Plate Parameters Estimated in the International Terrestrial Reference Frame ITRF2008 Based on SLR Stations 基于单反站的国际地面参考框架ITRF2008中构造板块参数估算
IF 2.3 4区 地球科学
Acta Geophysica Pub Date : 2016-12-02 DOI: 10.1515/acgeo-2016-0072
K. Kraszewska, M. Jagoda, M. Rutkowska
{"title":"Tectonic Plate Parameters Estimated in the International Terrestrial Reference Frame ITRF2008 Based on SLR Stations","authors":"K. Kraszewska, M. Jagoda, M. Rutkowska","doi":"10.1515/acgeo-2016-0072","DOIUrl":"https://doi.org/10.1515/acgeo-2016-0072","url":null,"abstract":"This paper concerns an analysis of the accuracy of estimated parameters Ω (Φ, Λ, ω) which define the tectonic plate motions. The study is based on the velocities of station positions published by ITRF2008 for Satellite Laser Ranging (SLR) technique. The Eurasian, African, North American and Australian plates were used in the analysis. Influence of the number and location of stations on the plate surface on estimation accuracy of the tectonic plate motion parameters was discussed. The results were compared with the APKIM 2005 IGN model. In general, a remarkable concurrence agreement between our solutions and the APKIM 2005 model was found.","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2016-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/acgeo-2016-0072","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67090679","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: 9
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