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 conferencePaperpeer-review

Abstract

We determine S-wave crustal velocity structure of the Sigsbee abyssal plain in the Gulf of the Mexico, using multi-component ocean bottom seismometer data. We first construct a 2-D P-wave velocity model by applying a ray-based 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
StatePublished - 2000
Event2000 Society of Exploration Geophysicists Annual Meeting, SEG 2000 - Calgary, Canada
Duration: Aug 6 2000Aug 11 2000

Conference

Conference2000 Society of Exploration Geophysicists Annual Meeting, SEG 2000
Country/TerritoryCanada
CityCalgary
Period08/6/0008/11/00

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