Print Email Facebook Twitter Development of a numerical model for the Sumatra subduction zone constrained by satellite gravimetry Title Development of a numerical model for the Sumatra subduction zone constrained by satellite gravimetry: with special focus on gravity sensitivity studies Author van Rossum, Leon (TU Delft Aerospace Engineering) Contributor Root, B.C. (mentor) van der Wal, W. (graduation committee) Degree granting institution Delft University of Technology Programme Aerospace Engineering Project European Space Agency - 3D Earth Date 2018-08-27 Abstract Satellite-derived gravity models have been used in modelling of several subduction zones, but not yet for the Sumatra subduction zone. There, gravity models can shed light on the geometry and density of the plate, and whether a slab tear is present under northern Sumatra, as seismic and tomographic studies present contradicting conclusions.Ten different gravity sensitivity tests were carried out. Those tests investigated the sensitivities of the radial gravity (gR) and the second gravity gradient tensor invariant (I1) to different slab parameters (depth, thickness, density), three isostatic scenarios, and the inclusion of subduction-specific characteristics, e.g. a slab tear, and subducting crust. An innovative approach was implemented to determine slab thickness estimates based on oceanic lithospheric age, subduction direction, and a weighted half-space cooling model. Thereafter, a numerical model for the Sumatra subduction zone was developed which approximates the XGM2016 satellite-terrestrial gravity observations and supports a slab tear. The gravity sensitivity test results together with the numerical model for the Sumatra subduction zone provide a valuable and universal foundation for future gravity-based subduction zone research. Subject Subduction zonesSumatraGravitySubducting slabSecond invariantGravity modelling To reference this document use: http://resolver.tudelft.nl/uuid:3b27e99c-2ddc-474b-bb5e-d24ebe3b7766 Embargo date 2018-08-27 Coordinates 2.656001,98.760391 Part of collection Student theses Document type master thesis Rights © 2018 Leon van Rossum Files PDF Thesis_Report_Leon_van_Rossum.pdf 57.97 MB PDF EGU_Poster_Leon_van_Rossum.pdf 6.65 MB Close viewer /islandora/object/uuid:3b27e99c-2ddc-474b-bb5e-d24ebe3b7766/datastream/OBJ1/view