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3D teleseismic travel time tomography along the Lesser Antilles subduction zone

Benedikt Braszus

Abstract (englisch):
This study presents a 3D teleseismic P-wave travel time tomography model along
the Lesser Antilles subduction zone.
Located on the eastern boarder of the Caribbean plate the Lesser Antilles island
arc formed during the last 40 Ma as a consequence of subduction of the relatively
westwards moving North American and South American plates underneath the
Caribbean plate.
The location of the hereby generated triple junction is debated in current re-
search and will be subject of this study.
A joint inversion methodology is applied combining global and regional tomo-
graphic approaches. As an initial model the entire Earth’s mantle in discretized
into spherical blocks with smaller block sizes for the area of investigation.
Ray paths are calculated using a 3D pseudo-bending ray tracing algorithm yield-
ing absolute travel times. They are correlated with absolute velocities of the
subsurface by performing a LSQR inversion.
The data consists of a filtered version of the global EHB catalogue and a manu-
ally processed set of 2604 travel times recorded on OBS stations deployed during
the V oiLA project as well as on permanent land stations in the Caribbean re-
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Volltext §
DOI: 10.5445/IR/1000124003
Veröffentlicht am 29.09.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Geophysikalisches Institut (GPI)
Publikationstyp Hochschulschrift
Publikationsdatum 28.09.2020
Sprache Englisch
Identifikator KITopen-ID: 1000124003
Verlag KIT, Karlsruhe
Umfang 83 S.
Art der Arbeit Abschlussarbeit - Master
Prüfungsdaten 12.06.2019
Referent/Betreuer Prof. Dr. Andreas Rietbrock
Schlagwörter teleseismic tomography, Lesser Antilles, Caribbean, P-wave tomography, travel time tomography, 3D tomography
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