GMT-based geological mapping and assessment of the bathymetric variations of the Kuril-Kamchatka Trench, Pacific Ocean

• Published in: Natural and Engineering Sciences
• Main Author: Lemenkova, Polina
• Other Authors: Ocean University of China (OUC), China Scholarship Council (CSC), State Oceanic Administration (SOA) Marine Scholarship of China, Grant#2016SOA002, Beijing, China
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2020
• Subjects: GMT; Bathymetry; Modelling; Mapping; Geospatial Analysis; ACM: K.: Computing Milieux; ACM: K.: Computing Milieux/K.3: COMPUTERS AND EDUCATION; ACM: K.: Computing Milieux/K.3: COMPUTERS AND EDUCATION/K.3.2: Computer and Information Science Education; ACM: K.: Computing Milieux/K.3: COMPUTERS AND EDUCATION/K.3.1: Computer Uses in Education; ACM: H.: Information Systems; ACM: H.: Information Systems/H.1: MODELS AND PRINCIPLES; ACM: H.: Information Systems/H.4: INFORMATION SYSTEMS APPLICATIONS; ACM: G.: Mathematics of Computing; ACM: G.: Mathematics of Computing/G.1: NUMERICAL ANALYSIS; [SDU.OCEAN]Sciences of the Universe [physics]/Ocean; Atmosphere; [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces; environment; [INFO.INFO-DS]Computer Science [cs]/Data Structures and Algorithms [cs.DS]; [INFO.INFO-GR]Computer Science [cs]/Graphics [cs.GR]; [INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation; [INFO.INFO-LG]Computer Science [cs]/Machine Learning [cs.LG]; [INFO.INFO-PL]Computer Science [cs]/Programming Languages [cs.PL]; [INFO.INFO-AI]Computer Science [cs]/Artificial Intelligence [cs.AI]; [INFO.INFO-CY]Computer Science [cs]/Computers and Society [cs.CY]; [SDU.STU]Sciences of the Universe [physics]/Earth Sciences; [SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology; [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography; [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]; [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology; [SDE]Environmental Sciences; [SDE.IE]Environmental Sciences/Environmental Engineering; [INFO]Computer Science [cs]; Pacific; Kamchatka
• Online Access: https://hal.archives-ouvertes.fr/hal-02485731; https://hal.archives-ouvertes.fr/hal-02485731/document; https://hal.archives-ouvertes.fr/hal-02485731/file/10.28978-nesciences.691708-976018.pdf; https://doi.org/10.28978/nesciences.691708

International audience This manuscript summarizes the results of the geospatial analysis undertaken by means of Generic Mapping Tools (GMT). The comparative assessment of the bathymetry of the Kuril-Kamchatka hadal trench was performed for southern and northern segments separated by the Bussol Strait. The formation of the hadal trench is affected by the impacts of local geological and geophysical settings varying along the trench. The methodological approach is as follows. The profiling was undertaken using GMT modules 'grdimage', 'grdtrack' and 'psxy'. The modelling consists of the collected data of 10706 observation samples from 52 profiles in southern part and 12726 from 62 profiles in the northern segment. The GMT modules 'psrose' and 'pshistograms' were used to plot histograms and rose diagrams visualizing bathymetric variables of depths. The geology was mapped using GMT modules 'pscoast', 'grdcut', 'grdcontour' and 'psxy' to plot lineaments and geological objects (ophiolites, faults, earthquakes, trench, magnetic anomalies, tectonic slabs, fracture zones and volcanoes). The base map is based on the ETOPO Global Relief Model. The comparison of the bathymetry shown variations in the northern and southern segments: southern part reaches-8,200 m maximal depths while northern has-7,800 m. This is influenced by the geological settings: earthquakes magnitude and seismisity are higher in the southwest. The submarine terraces and floodplains were observed at-4000 m depth forming landforms located southwards off the Bussol Strait. This geospatial analysis contributes to the development of the geological mapping with an example of the Kamchatka area, a region with high seismisity and repeated earthquakes.