Preliminary Results of the Southern Mariana Trench Wide-Angle Seismic Experiment

Genggeng Wen, Kuiyuan Wan, Jinlong Sun

Abstract

The Mariana subduction zone is a key area of magmatism and tectonic evolution in the western Pacific, which has the deepest abyss “Challenger Deep” on the earth. An active source seismic experiment with an array of ocean bottom seismometers (OBS) were conducted across the Challenger Deep in the southern Mariana Trench during November-December 2016, and we have acquired the first significant wide-angle seismic data. We relocated the OBSs position and revised the travel-time of the phases, using the travel-time data of the direct water waves, and obtained high-quality seismic sections based on these corrections. The phase records are complex because of the topography variations but each OBS has recorded continuous and clear phases with a maximum offset of 120 km. The phases of crustal refraction were identified at 5~80 km offsets with little difference on the two sides of the southern Mariana Trench, while the reflections from Moho were found to be very different. From the seismic record profiles, those phases provide an important foundation for analyzing the structure and evolution of crust and the features of its internal velocity structure in Mariana Trench-Arc-Basin system.

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Paper Citation


in Harvard Style

Wen G., Wan K. and Sun J. (2018). Preliminary Results of the Southern Mariana Trench Wide-Angle Seismic Experiment.In Proceedings of the International Workshop on Environment and Geoscience - Volume 1: IWEG, ISBN 978-989-758-342-1, pages 364-368. DOI: 10.5220/0007430503640368


in Bibtex Style

@conference{iweg18,
author={Genggeng Wen and Kuiyuan Wan and Jinlong Sun},
title={Preliminary Results of the Southern Mariana Trench Wide-Angle Seismic Experiment},
booktitle={Proceedings of the International Workshop on Environment and Geoscience - Volume 1: IWEG,},
year={2018},
pages={364-368},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0007430503640368},
isbn={978-989-758-342-1},
}


in EndNote Style

TY - CONF

JO - Proceedings of the International Workshop on Environment and Geoscience - Volume 1: IWEG,
TI - Preliminary Results of the Southern Mariana Trench Wide-Angle Seismic Experiment
SN - 978-989-758-342-1
AU - Wen G.
AU - Wan K.
AU - Sun J.
PY - 2018
SP - 364
EP - 368
DO - 10.5220/0007430503640368