GRASS GIS for topographic and geophysical mapping of the Peru-Chile Trench

Lemenkova, Polina

doi:10.5775/fg.2020.009.d

Cited by 13 publications

(8 citation statements)

References 60 publications

(61 reference statements)

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“…Cartography as an important discipline among the Earth sciences has experienced technical advances with the development of programming. New methods used for spatial data processing have enabled a more effective processing of the complex datasets for modelling the Earth [28,116,117]. This enables obtaining new insights into the correlations among the Earth phenomena.…”

Section: Discussionmentioning

confidence: 99%

Handling Dataset with Geophysical and Geological Variables on the Bolivian Andes by the GMT Scripts

Lemenkova

2022

Data

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In this paper, an integrated mapping of the georeferenced data is presented using the QGIS and GMT scripting tool set. The study area encompasses the Bolivian Andes, South America, notable for complex geophysical and geological parameters and high seismicity. A data integration was performed for a detailed analysis of the geophysical and geological setting. The data included the raster and vector datasets captured from the open sources: the IRIS seismic data (2015 to 2021), geophysical data from satellite-derived gravity grids based on CryoSat, topographic GEBCO data, geoid undulation data from EGM-2008, and geological georeferences’ vector data from the USGS. The techniques of data processing included quantitative and qualitative evaluation of the seismicity and geophysical setting in Bolivia. The result includes a series of thematic maps on the Bolivian Andes. Based on the data analysis, the western region was identified as the most seismically endangered area in Bolivia with a high risk of earthquake hazards in Cordillera Occidental, followed by Altiplano and Cordillera Real. The earthquake magnitude here ranges from 1.8 to 7.6. The data analysis shows a tight correlation between the gravity, geophysics, and topography in the Bolivian Andes. The cartographic scripts used for processing data in GMT are available in the author’s public GitHub repository in open-access with the provided link. The utility of scripting cartographic techniques for geophysical and topographic data processing combined with GIS spatial evaluation of the geological data supported automated mapping, which has applicability for risk assessment and geological hazard mapping of the Bolivian Andes, South America.

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Section: Discussionmentioning

confidence: 99%

Handling Dataset with Geophysical and Geological Variables on the Bolivian Andes by the GMT Scripts

Lemenkova

2022

Data

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“…Scripting operates in an approach similar to the programming or markup languages (Lemenkov, Lemenkova 2021a) by using a certain syntax of the code used for generating scripts that can be run from the console for plotting maps. Among the most reputable cartographic tools are the GRASS GIS and the GMT (Lemenkova 2019b(Lemenkova , 2020b. The GMT demonstrated in this study brings evident benefits to seismic and geophysical mapping through the automated workflow and accurate data handling.…”

Section: Final Conclusionmentioning

confidence: 98%

Cartographic scripts for seismic and geophysical mapping of Ecuador

Lemenkova

2022

Geografie

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This research describes a script-based method of Generic Mapping Tools (GMT) for mapping the seismicity, geophysics, geology and topography of Ecuador. The advances of GMT include the following points: (1) automation of workflow; (2) refined aesthetics of graphics; (3) speed console-based mapping; (4) multi-format data handling; (5) advanced syntax. An explanation of scripting with the examples of code snippets is provided. The results present six new maps of Ecuador. The distribution of geophysical phenomena and seismicity is compared to the terrain elevation, showing remarkable correlations with the topography and geoid. The data demonstrated low values in the depression of the Andes, the Gulf of Guayaquil, and the Peru-Chile Trench. The peaks in gravity are representative for the Andean topography. Local decreases in gravity correspond to the depressions in the coastal shelf and the Gulf of Guayaquil. The increase in seismicity is detected along the tectonically active areas. The GMT is appropriate to the geological risk assessment of Ecuador.

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“…4) has been prepared using GMT scripting toolset [25]. The difference of GMT from the traditional GIS [26][27][28][29][30][31] consists in the console which enables interactive mapping that combines coding, visualization of cartographic images and graphs, and plotting textual annotations on the graphics [32].…”

Section: Cartographic Plotting In Gmtmentioning

confidence: 99%

Cartographic scripting for geophysical mapping of Malawi Rift Zone

Lemenkova¹

2022

Tehnika

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This paper describes a scripting cartographic techniques that automatically generate maps from open source spatial data using syntax of General Mapping Tools (GMT) and R. A case study present mapping East Africa with a focus on Malawi. In this study, two different approaches of scripting cartography using R programming language and GMT were studied for geophysical analysis aimed to visualize a series of eight new maps in Malawi: topography based on the GEBCO data, seismicity, geomorphometric modeling based on SRTM-90 m (slope, aspect, hillshade and elevation) and geophysical fields: geoid based on EGM-2008 and free-air Faye's gravity based on satellite derived gravity data from CryoSat-2 and Jason-1. In contrast to previous maps of Malawi, a scripting approach was introduced as a console-based cartographic mapping developed for plotting a series of thematic maps based on the high-resolution data. The maps demonstrate correlations between the topography and tectonic faults (Malawi Rift Zone) and earthquakes in the Malawi Lake and extent of landforms. The results demonstrate strong correspondence between the topography and geophysical fields (geoid and gravity): negative values of geoid (-15 to -20) are notable over the Malawi (Nyasa) Lake which corresponds with local topographic depressions. Free-air gravity fields reach the lowest values (-50 to -100) over the Malawi Lake. Local heights in gravity are compared with topographic mountain ranges in the NW and SW of the country on the borders with Zambia and Mozambique. The location of earthquakes vary with the majority located in the north. The geomorphological landforms demonstrate variability in slope steepness and aspect orientation shown on histogram. The techniques of scripts can be used to automatically map spatial data using raster datasets for geophysical visualization, and this paper demonstrated this through a variety of map from the presented thematic series of geophysical maps of Malawi. Full scripts used for mapping are available on the author's public GitHub repository with provided link to her open access codes.

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GRASS GIS for topographic and geophysical mapping of the Peru-Chile Trench

Cited by 13 publications

References 60 publications

Handling Dataset with Geophysical and Geological Variables on the Bolivian Andes by the GMT Scripts

Handling Dataset with Geophysical and Geological Variables on the Bolivian Andes by the GMT Scripts

Cartographic scripts for seismic and geophysical mapping of Ecuador

Cartographic scripting for geophysical mapping of Malawi Rift Zone

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