Insights on the Indian Ocean Tectonics and Geophysics Supported by GMT

Risks and Catastrophes Journal, 27(2), 67-83. DOI: 10.24193/RCJ2020_12

17 Pages Posted: 8 Feb 2021

See all articles by Polina Lemenkova

Polina Lemenkova

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

Date Written: December 1, 2020

Abstract

This paper presented analyzed and summarized data on geological and geophysical settings about the tectonics and geological structure of the seafloor of the Indian Ocean by thematic visualization of the topographic, geophysical and geological data. The seafloor topography of the Indian Ocean is very complex which includes underwater hills, isolated mountains, underwater canyons, abyssal and accumulative plains, trenches. Complex geological settings explain seismic activity, repetitive earthquakes, and tsunami. Understanding and prognosis of the disastrous and catastrophic geological events is strongly based on correct data analysis, mod- elling and visualization. An important feature of this paper is mapping multi-source high-resolution data by GMT. Data include raster grids in NetCDF and GRD formats: ETOPO1, geologic and marine free-air gravity data, EGM96, age, spreading rates, and spreading asymmetry of the ocean crust by NOAA, total sediment thickness. Data were visualized by GMT modules to compare and analyze geophysical and geological settings of the Indian Ocean. Visualization reveled correlations between high bathymetric variations of the oceanic seafloor, distribution of main geological seafloor fabric: Southwest, Southeast, Mid and Carlsberg ridges. Tectonic maps were plotted to perform comparative analysis of several variables: crust age, spreading half rates (mm/yr), asymmetries in crustal accretion on conjugate ridge flanks (%), variations in the geopotential and gravimetric models. Being the warmest of the world’s ocean, Indian Ocean has specific climatic conditions (repetitive monsoons, tsunamis, cyclones and storms), complex geologic seafloor structure with triple junction and unique geographic settings. Presented paper contribut ed to the regional studies of the Indian Ocean.

Keywords: Indian Ocean, geomorphology, seafloor, geophysics, topography, GMT

JEL Classification: Y92, Q00, Q01, Q20, Q24, Q25, Q30, Q32, Q33, Q34, Q35, Q40, Q41, Q50, Q51, Q54, Q55, Q56, C00, C02

Suggested Citation

Lemenkova, Polina, Insights on the Indian Ocean Tectonics and Geophysics Supported by GMT (December 1, 2020). Risks and Catastrophes Journal, 27(2), 67-83. DOI: 10.24193/RCJ2020_12, Available at SSRN: https://ssrn.com/abstract=3740505

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
12
Abstract Views
182
PlumX Metrics