GMT Based Comparative Analysis and Geomorphological Mapping of the Kermadec and Tonga Trenches, Southwest Pacific Ocean

Geographia Technica, Vol. 14, Issue 2, pp. 39-48. DOI: 10.21163/GT_2019.142.04

10 Pages Posted: 5 Nov 2019

See all articles by Polina Lemenkova

Polina Lemenkova

Schmidt Institute of Physics of the Earth, Russian Academy of Sciences

Date Written: October 25, 2019

Abstract

Current study is focused on the GMT based modelling of the two hadal trenches located in southwest Pacific Ocean, eastwards from Australia: Tonga and Kermadec. Due to its inaccessible location, the seafloor of the deep-sea trench can only be visualized using remote sensing tools and advanced algorithms of data analysis. The importance of the developing and technical improving of the innovative methods in cartographic data processing is indisputable. Automatization in data analysis has been significantly increased over the past years. However, using programming and scripting in cartography still remains lower comparing to the use of the traditional GIS. Therefore, developing GMT-based methods for the geomorphological data processing is crucial for better understanding the landforms of the seafloor. Methodology includes application of the GMT scripting toolset for the automated digitizing of the profiles crossing the trenches in perpendicular direction. A sequence of the GMT codes enabled to visualize raster and vector data, perform geomorphological modelling, descriptive statistical data analysis and quantitative comparison of the two trenches. Using GMT, the bathymetric sample data of the Kermadec and Tonga trenches were modeled, analyzed and compared. The results show deeper bathymetry and more seafloor roughness for the Tonga. Comparing to Kermadec, Tonga Trench has steeper gradient of the profiles. The seafloor geomorphology is strongly affected by a variety of factors that shape actual form of both trenches. The experimental methodology is fully based on the GMT scripting with presented and explained codes.

Keywords: GMT, Generic Mapping Tools, geomorphology, mapping, cartography, hadal trench, Tonga, Kermadec, data analysis, data processing, data modelling, geospatial analysis, geology, Pacific Ocean

JEL Classification: Y92, Y10, Y1, Q00, Q01, Q25, Q30, Q50, Q51, Q54, Q55, Q59, C00, C02, C13, C23, C63, C69

Suggested Citation

Lemenkova, Polina, GMT Based Comparative Analysis and Geomorphological Mapping of the Kermadec and Tonga Trenches, Southwest Pacific Ocean (October 25, 2019). Geographia Technica, Vol. 14, Issue 2, pp. 39-48. DOI: 10.21163/GT_2019.142.04, Available at SSRN: https://ssrn.com/abstract=3475402

Polina Lemenkova (Contact Author)

Schmidt Institute of Physics of the Earth, Russian Academy of Sciences ( email )

Bolshaya Gruzinskaya Str., 10
Bld. 1
Moscow, 123995
Russia
+007-916-298-37-19 (Phone)

HOME PAGE: http://https://www.researchgate.net/profile/Polina_Lemenkova

Do you have a job opening that you would like to promote on SSRN?

Paper statistics

Downloads
9
Abstract Views
221
PlumX Metrics