Comparison of seismic reflection data to a synthetic seismogram in a volcanic apron at Site 953

Funck, Thomas and Lykke-Andersen, H. (1998) Comparison of seismic reflection data to a synthetic seismogram in a volcanic apron at Site 953 Proceedings of the Ocean Drilling Program: Scientific Results, 157 . pp. 3-9.

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The volcanic apron of Gran Canaria at Site 953 is characterized by numerous, closely spaced reflectors, allowing a highresolution
stratigraphic correlation. The calibration of the presite survey seismic data (during the Meteor Cruise 24) with regard
to the lithology and stratigraphy found at the drill site was achieved by computing a synthetic seismogram serving as the link
between seismic and borehole data. Because logging data were available for only 53% of the hole, velocity and density measurements
taken from the recovered cores were used in the missing intervals to obtain a complete synthetic seismogram. Most
reflectors in the upper ~900 m of the sequence (lithologic Units I–V) turned out to be thin volcaniclastic layers intercalated to
the nonvolcanic background sediments. Their thicknesses are generally <2 m, and the reflections from their tops and bases
overlap, forming a single reflection. The limit of the seismic detection of such interbeds is on the order of several decimeters
and thus requires special care for the processing of the velocity and density data to avoid destruction of the signal from these
thin layers.

Document Type: Article
Keywords: Seismic reflection data, volcanc apron, Gran Canaria; ODP Leg 157 Site 953
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
Refereed: No
ISSN: 1096-7451
Projects: ODP
Date Deposited: 12 Feb 2016 13:51
Last Modified: 25 Oct 2016 11:58

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