scholarly journals The New Seismotectonic Atlas of Greece (v1.0) and Its Implementation

Geosciences ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 447
Author(s):  
Ioannis Kassaras ◽  
Vasilis Kapetanidis ◽  
Athanassios Ganas ◽  
Andreas Tzanis ◽  
Chrysanthi Kosma ◽  
...  
Keyword(s):  
Data Processing ◽  
Risk Mitigation ◽  
Active Tectonics ◽  
Geological Mapping ◽  
Geodetic Data ◽  
Joint Analysis ◽  
Seismological Data ◽  
Geodynamic Processes ◽  
Gis Environment ◽  
Of Greece

Knowledge and visualization of the present-day relationship between earthquakes, active tectonics and crustal deformation is a key to understanding geodynamic processes, and is also essential for risk mitigation and the management of geo-reservoirs for energy and waste. The study of the complexity of the Greek tectonics has been the subject of intense efforts of our working group, employing multidisciplinary methodologies that include detailed geological mapping, geophysical and seismological data processing using innovative methods and geodetic data processing, involved in surveying at various scales. The data and results from these studies are merged with existing or updated datasets to compose the new Seismotectonic Atlas of Greece. The main objective of the Atlas is to harmonize and integrate the most recent seismological, geological, tectonic, geophysical and geodetic data in an interactive, online GIS environment. To demonstrate the wealth of information available in the end product, herein, we present thematic layers of important seismotectonic and geophysical content, which facilitates the comprehensive visualization and first order insight into seismic and other risks of the Greek territories. The future prospect of the Atlas is the incorporation of tools and algorithms for joint analysis and appraisal of these datasets, so as to enable rapid seismotectonic analysis and scenario-based seismic risk assessment.

Design and implementation of the seismotectonic Atlas of Greece v1.0

2020 ◽  
Author(s):  
Ioannis Kassaras ◽  
Vasilis Kapetanidis ◽  
Athanassios Ganas ◽  
Andreas Tzanis ◽  
Panayotis Papadimitriou ◽  
...  
Keyword(s):  
Crustal Deformation ◽  
Eastern Mediterranean ◽  
Active Faults ◽  
Active Tectonics ◽  
Geological Mapping ◽  
Geospatial Information ◽  
African Plate ◽  
Digital Version ◽  
Gulf Of Corinth ◽  
Of Greece

<p>Knowledge of the present-day relationships between earthquakes, active tectonics, and crustal deformation is a key for understanding the geodynamics, ongoing surface processes (i.e. erosion, sedimentation, etc.) and is also essential for the risk assessment and management of geo-reservoirs for energy and waste.</p><p>Greece is characterized by the most tectonically active regime in the eastern Mediterranean, involving (a) intense crustal deformation and thickening, with an uplift rate of a few mm/yr along the Hellenic Arc due to accretion of sediments of the African plate beneath the overriding Aegean plate, (b) wide-spread extension in the back-arc region (for example in the Gulf of Corinth) due to retreat of the African slab and (c) significant strike-slip motions due to offset between oceanic-continental subduction in the west and the westward propagation of Anatolia in the east. Study of the complexity of the contemporary Greek tectonics has been the subject of intense efforts of our working group during the last decade, employing multidisciplinary state-of-the-art methodologies regarding geological mapping, seismological and geodetic surveying and numerical analyses at various scales. The products of these studies are the pieces of a puzzle that we aim to merge with existing data (topography, bathymetry, land-use, etc) in order to compose the digital version of the modern Seismotectonic Atlas of Greece.</p><p>It has been over 30 years since the first edition of the seismotectonic map was published by Greece's Geological Institute in 1989, which emerges the need for an update, as soon as dozens of strong earthquakes have occurred both on mainland and offshore, whose locations and fault kinematics have been studied and this information has to be taken into account in city and infrastructure planning. Moreover, the patterns of active tectonics and stress, the tectonic strain distribution, the annual ratio between seismic and geodetic moment release, the precise location of onshore active faults and the slip-rates of major faults are much better known today than they were 30 years ago.</p><p>Open-source mapping software and GIS tools are being used to showcase important up-to-date seismotectonic features together with critical geospatial information (motorways, railways, gas pipelines, electricity plants, etc) at a nationwide scale of 1:500,000. This updated product aims to reveal a comprehensive image of the regional crustal deformation in a useful manner for scientists, students, and stakeholders to obtain a first-order perception of seismic risk in the Greek territory, but, also, to be used as a basis for other applications in Geosciences.</p>

scholarly journals Results of the infrasonic array on the Valaam Island primary data processing

2020 ◽  
Vol 2 (1) ◽  
pp. 85-91
Author(s):  
Vladimir Karpinsky ◽  
Vladimir Asming
Keyword(s):  
Data Processing ◽  
Seismic Station ◽  
Sampling Rate ◽  
Low Frequency ◽  
Primary Data ◽  
Joint Analysis ◽  
Main Task ◽  
Significant Difference ◽  
Infrasound Signal ◽  
Short Time

The infrasound array VALS developed in Kola Branch GS RAS has been installed in June 2016 on the Valaam Island in addition to the continuously operating seismic station VALR. The array consists of 3 spaced low-frequency microphones. The data with a sampling rate of 100 Hz is stored continuously at the acquisition computer; the timing is carried out using GPS. In addition to the acquisition system, an infrasound signal detector is installed on the computer. It works in near real-time mode and enables us to find signals and compute their back azimuths. At the end of 2018, a new version of the detector was developed at the Kola Branch GS RAS. The detector began to work much faster, which enabled us to carry out data processing for 2.5 years in two frequency ranges in a short time. The main task of the array is acoustic monitoring, the detection of infrasound events, the determination of their parameters, and the selection of events of natural origin. The data are also used (in combination with the VALR seismic station data) to locate near seismic events, especially weak ones. The analysis of the obtained data revealed the prevailing directions to the signal sources. The change of directions to sources in time was investigated, seasonal features were revealed. Acoustic events were detected in the frequency bands 1–5 Hz and 10–20 Hz, and a significant difference was found in the azimuthal distribution of events for these ranges. A joint analysis of acoustic and seismic data showed that the part of events with both acoustic and seismic components is low – it is almost completely exhausted by career explosions. It was also noted that in addition to explosions in nearby quarries (Kuznechnoye, Pitkäranta) located at a distance of 50–60 km, according to acoustic data, events corresponding to explosions at quarries located at a distance of 100 km or more were repeatedly identified.

scholarly journals Functional equivalence of genome sequencing analysis pipelines enables harmonized variant calling across human genetics projects

2018 ◽  
Author(s):  
Allison A. Regier ◽  
Yossi Farjoun ◽  
David Larson ◽  
Olga Krasheninina ◽  
Hyun Min Kang ◽  
...  
Keyword(s):  
Data Processing ◽  
Genome Sequencing ◽  
Statistical Power ◽  
Human Genetics ◽  
Variant Calling ◽  
Joint Analysis ◽  
Sequencing Analysis ◽  
Batch Effects ◽  
Many Sources ◽  
Genomic Regions

AbstractHundreds of thousands of human whole genome sequencing (WGS) datasets will be generated over the next few years to interrogate a broad range of traits, across diverse populations. These data are more valuable in aggregate: joint analysis of genomes from many sources increases sample size and statistical power for trait mapping, and will enable studies of genome biology, population genetics and genome function at unprecedented scale. A central challenge for joint analysis is that different WGS data processing and analysis pipelines cause substantial batch effects in combined datasets, necessitating computationally expensive reprocessing and harmonization prior to variant calling. This approach is no longer tenable given the scale of current studies and data volumes. Here, in a collaboration across multiple genome centers and NIH programs, we define WGS data processing standards that allow different groups to produce “functionally equivalent” (FE) results suitable for joint variant calling with minimal batch effects. Our approach promotes broad harmonization of upstream data processing steps, while allowing for diverse variant callers. Importantly, it allows each group to continue innovating on data processing pipelines, as long as results remain compatible. We present initial FE pipelines developed at five genome centers and show that they yield similar variant calling results – including single nucleotide (SNV), insertion/deletion (indel) and structural variation (SV) – and produce significantly less variability than sequencing replicates. Residual inter-pipeline variability is concentrated at low quality sites and repetitive genomic regions prone to stochastic effects. This work alleviates a key technical bottleneck for genome aggregation and helps lay the foundation for broad data sharing and community-wide “big-data” human genetics studies.

GIS as a Tool for Seismological Data Processing

2002 ◽  
Vol 159 (5) ◽  
pp. 945-967 ◽  
Author(s):  
G. Leonard ◽  
Z. Somer ◽  
Y. Bartal ◽  
Y. Ben Horin ◽  
M. Villagran ◽  
...  
Keyword(s):  
Data Processing ◽  
Seismological Data

scholarly journals Integrating Virtual Reality and GIS Tools for Geological Mapping, Data Collection and Analysis: An Example from the Metaxa Mine, Santorini (Greece)

2020 ◽  
Vol 10 (23) ◽  
pp. 8317
Author(s):  
Varvara Antoniou ◽  
Fabio Luca Bonali ◽  
Paraskevi Nomikou ◽  
Alessandro Tibaldi ◽  
Paraskevas Melissinos ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Data Collection ◽  
Industrial Development ◽  
Three Dimensional ◽  
Geological Mapping ◽  
Gis Tools ◽  
Data Collection And Analysis ◽  
Volcanic Processes ◽  
Gis Environment ◽  
A Site

In the present work we highlight the effectiveness of integrating different techniques and tools for better surveying, mapping and collecting data in volcanic areas. We use an Immersive Virtual Reality (IVR) approach for data collection, integrated with Geographic Information System (GIS) analysis in a well-known volcanological site in Santorini (Metaxa mine), a site where volcanic processes influenced the island’s industrial development, especially with regard to pumice mining. Specifically, we have focused on: (i) three-dimensional (3D) high-resolution IVR scenario building, based on Structure from Motion photogrammetry (SfM) modeling; (ii) subsequent geological survey, mapping and data collection using IVR; (iii) data analysis, e.g., calculation of extracted volumes, as well as production of new maps in a GIS environment using input data directly from the IVR survey; and finally, (iv) presentation of new outcomes that highlight the importance of the Metaxa Mine as a key geological and volcanological geosite.

scholarly journals Mapping of superficial formations: a methodological proposal for systematic cartography of the Brazilian territory

2020 ◽  
Vol 3 (3) ◽  
pp. 169-188
Author(s):  
Maria Angélica Ramos ◽  
◽  
Marcelo Dantas ◽  
Maria Adelaide Maia ◽  
Iris Bandeira ◽  
...  
Keyword(s):  
Physical Environment ◽  
Methodological Approach ◽  
Federal District ◽  
Geological Mapping ◽  
Mass Movements ◽  
Aquifer Recharge ◽  
Intrinsic Properties ◽  
National Scale ◽  
Tropical Zone ◽  
Gis Environment

We present a methodological proposal for the systematic mapping of superficial formations applicable on a national scale. The importance of such a proposition stems from the fact that a large part of the Brazilian territory is located in a humid or semi-humid tropical zone, where deeply weathered and sometimes tens of meters thick lateritized regolith mantles develop. The methodological approach consists of a geological-geomorphological-pedological compartmentalization of the terrains, together with elements of morphostratigraphic analysis and of the intrinsic properties of saprolites and soils. This approach, structured in a GIS environment, was applied in two different areas in Brazil: The Federal District and the São Luis island in the state of Maranhão, where the complex geodiversity of the regolith landscape stands out in both areas. The results highlight the diversity of horizons in the regolith profile, in addition to its anisotropy. The recognition of the complexity of these superficial formations is, therefore, of great importance for a more detailed analysis of various themes, such as for civil works; susceptibility to erosion and mass movements; potential for aquifer recharge; and mineral potential. Finally, the importance of the study of superficial formations is emphasized for the improvement of geological mapping and for the multi-thematic analysis of the physical environment applied to land management.

Multivariate mathematical-cartographic modeling demographic characteristics of Russian and European regions

2019 ◽  
Vol 953 (11) ◽  
pp. 26-36
Author(s):  
A.I Igonin ◽  
V.S. Tikunov
Keyword(s):  
Demographic Characteristics ◽  
Qualitative Assessment ◽  
Joint Analysis ◽  
Demographic Development ◽  
Demographic Situation ◽  
Demographic Indicators ◽  
Current Trends ◽  
Demographic Processes ◽  
Cartographic Modeling ◽  
Gis Environment

The study of modern trends in demographic development in Europe and Russia, in particular the assessment of spatial patterns of changes require updating the database of demographic indicators. To carry out a comparative analysis of current trends in demographic development in Europe and Russia, three sets of indicators characterizing the demographic state of the regions were formed. The calculation of indices of demographic development with different sets of indicators was made. A series of maps of the demographic situation and its dynamics in the GIS environment was developed. The joint analysis of all nine variants of the demographic state enabled developing a single, final index for assessing the demographic development of the territory. Multivariate mathematical-cartographic modeling helped performing a qualitative assessment of demographic processes and their changes. The implicit features and differences in the demographic characteristics of the regions are revealed. The application of classification algorithms to such a vast territory helps decision-making as part of a change in demographic policy.

Structure of a fault segment boundary in the Lost River fault zone, Idaho, and possible effect on the 1983 Borah Peak earthquake rupture

1990 ◽  
Vol 80 (1) ◽  
pp. 57-68
Author(s):  
David D. Susong ◽  
Susanne U. Janecke ◽  
Ronald L. Bruhn
Keyword(s):  
Fault Zone ◽  
Three Dimensional ◽  
Longitudinal Axis ◽  
Geometrical Model ◽  
Geological Mapping ◽  
Earthquake Rupture ◽  
East Central ◽  
The North ◽  
Seismological Data ◽  
Projected Position

Abstract The 1983 Borah Peak earthquake (Ms 7.3) initiated within the southern part of the Thousand Springs segment in the Lost River fault zone, east-central Idaho. The earthquake rupture propagated unilaterally to the northwest over a distance of 36 km and was accompanied by sinistral-normal slip within the fault zone. At the surface, the southern-most part of the rupture zone is marked by a bend in the Lost River fault zone at the intersection between the Thousand Springs segment to the north and the Mackay segment of the fault zone to the southeast. The intersection between the two fault segments is a lens-shaped area that contains numerous NW- and NE-striking faults that cut the Paleozoic bedrock. Several of the faults within the intersection zone ruptured at the surface during the 1983 earthquake. A three-dimensional geometrical model of the intersection zone between the Thousand Springs and Mackay fault segments was constructed from geological mapping in conjunction with previously published interpretations of geodetic and seismological data. The longitudinal axis of the intersection zone plunges to the southwest, where its projected position in the subsurface roughly coincides with the location of the 1983 earthquake's hypocenter at a depth of 15 to 16 km. The intersection zone between the two fault segments may have played a dual role during the Borah Peak earthquake, both marking the site of rupture nucleation, but also acting to arrest spread of the rupture to the southeast onto the adjacent Mackay segment.

Determination of local active tectonics regime in central and northern Greece, using primary geodetic data

2020 ◽  
Author(s):  
Ilias Lazos ◽  
Christos Pikridas ◽  
Alexandros Chatzipetros ◽  
Spyros Pavlides
Keyword(s):  
Active Tectonics ◽  
Geodetic Data ◽  
Northern Greece
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