Data for: Lateral Crustal Variation and Post-rift Magmatism in the Northeastern South China Sea Determined by Wide-angle Seismic Data

Published: 23 January 2019| Version 1 | DOI: 10.17632/h3tdwyv4j2.1
Contributors:
Fan Chaoyan,
Shaohong Xia,
Fang Zhao,
Jinlong Sun,
Jinghe Cao,
Kuiyuan Wan,
Huilong Xu

Description

In May 2014, a deep seismic survey was carried out in Dongsha area, the northeastern South China Sea. The R/V Shiyan II of the South China Sea Institute of Oceanology provide a four BOLT airguns array with a total nominal volume of 6000 in3 (~98.3L) towed at 10 m depth below the sea surface. When airguns shooting, the refraction survey with 53 OBSs and the reflection survey with 4 channel steamer was carried out in the same time. The single channel seismic data was recorded for 12 s for each trace, with a 2-ms sample interval. Only band-pass filtering (10-20-60-100 Hz) and amplitude correction were applied to each channel’s data. All new acquired single channel seismic data are presented in Datasets01 (PDF format, named dataset01_Single Chanel Seismic Profiles.pdf).The OBS data were converted into SEG-Y and stored in common receiver gathers with a reduced velocity of 6.0 km/s. Band-pass filters (2-3-8-10 Hz) were applied to all OBS data. Only the vertical component or the hydrophone component was chosen for plotting. OBS profiles and rays tracing for NS5 are presented in Datasets02 (PDF format, named dataset02_OBS Profiles and Rays Tracing along NS5.pdf). Rays tracings, rays coverages, and traveltime fittings are presented in Datasets03 (PDF format, named dataset03_Rays Tracing and Traveltime calculations.pdf). Data Set S1: The single channel seismic profiles with plain interpretation. The light blue denote the Tg (lower boundaries of Cenozoic strata). The black lines show normal faults and the orange crosshairs show intruded volcanic bodies. (PDF format) Data Set S2: Seismic phases, travel time picking and travel ray tracing from the OBS profiles. (top in each page) Travel ray tracing and coverage for OBSs. (bottom in each page) The seismic record profile of the vertical component of OBSs, plotted with a reduction velocity of 6 km/s. The short vertical bars with colors denote the manually picked traveltimes, and the thin black lines denote the traveltimes predicted by the final velocity model. (PDF format) Data Set S3: Travel ray tracings, rays coverages (top in each page), and traveltime fittings for each survey line (bottom in each page). The short vertical bars with colors denote the manually picked traveltimes, and the thin black lines denote the traveltimes predicted by the final velocity model. Note the calculated traveltimes fit well with the picked traveltimes. (PDF format)

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