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Presentation of the Master's Thesis: 3D teleseismic travel-time tomography in the Lesser Antilles

Presentation of the Master's Thesis: 3D teleseismic travel-time tomography in the Lesser Antilles
Datum:

21.05.2019

Referent:

Benedikt Braszus

Abstract

The goal of this work is to develop a 3-D teleseismic P-wave travel-time tomography model of the Lesser Antilles island arc. The geological setting is given by the North and South American plates that are subducting westwards underneath the Caribbean plate and create a N-S orientated trench. At the northern part of the subduction zone the North American plate subducts southwards beneath Puerto Rico and Hispaniola which bends the trench westwards.
The main objectives are to estimate the amount and current location of previously subducted lithosphere along the arc and to assess whether the plate boundary of the North and South American plate is visible in the tomography model e.g. as a gap in the subducting slab.
A joint inversion approach is applied which combines a global data set from the ISC-EHB-Bulletin with the local data set obtained from OBS stations deployed as part of the VoiLA-project and permanent land stations for the region of the Lesser Antilles.
Since the entire earth's mantle is parametrised the rays are traced along their full ray path which allows an inversion for absolute velocities. In order to achieve a higher resolution and account for the denser ray coverage the model space is parametrised finer in the area of the investigated subduction zone. Resolution of the model space is assessed by conducting checkerboard tests.