S-wave velocity structure of the crust in the Sigsbee plain in the Gulf of Mexico determined from multi-component ocean bottom seismometer data

Sangmyung D. Kim, Seiichi Nagihara, Yosio Nakamura

Research output: Contribution to journalArticlepeer-review

Abstract

We determine S-wave crustal velocity structure of the Sigsbee abyssal plain in the Gulf of the Mexico, using multicomponent ocean bottom seismometer data. We first construct a 2-D P-wave velocity model by applying a raybased travel-time inversion to the vertical component data. Then, we make an attempt to identify in the radial component records the events associated with P-S mode conversion. Using iterative forward modeling, we constrain S-wave velocities of the layers identified in the P-wave model. We are able to identify the mode-converted events with high confidence, because of the relatively simple geologic structure of the area. Vp/Vs values of the sedimentary layers and their relationship with Vp is indicative of lithologic change with depth: poorly consolidated shale at the top, compacted shale in the middle, and carbonates at the bottom.

Original languageEnglish
Pages (from-to)1166-1169
Number of pages4
JournalSEG Technical Program Expanded Abstracts
Volume19
Issue number1
DOIs
StatePublished - Jan 1 2000

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