Ocean bottom seismometer (OBS) seismic refraction data in the Gulf of Mexico off the Yucatan Peninsula, acquired by the R/V Longhorn in 1996 (96L676)

The project collected seismic reflection (M/V?GECO Sigma) and refraction data along two lines that cross the Chicxulub KT Impact Crater; Yucatan; Mexico. It represents a joint collaborative effort between the British Institutions Reflection Profiling Syndicate (BIRPS) (UK); the Canadian Geological Survey; Imperial College (UK); the Lunar and Planetary Institute; the Universidad Nacional Aut?noma de M?xico (UNAM); and The University of Texas Institute for Geophysics (UTIG). The OBS wide-angle and refraction data were collected at the same time as the reflection data and are being integrated with the land-based wide-angle data to model the velocity structure of the Chicxulub crater.?The purpose of this joint project was to image in detail the internal crustal structure and morphology of the Chicxulub impact crater and to quantify its dimensions.

本项目沿两条穿越墨西哥尤卡坦半岛希克苏鲁伯KT撞击坑（Chicxulub KT Impact Crater）的测线，采集了地震反射（采集自机动船GECO Sigma号）与折射数据。本项目由英国机构地震反射剖面联合会（British Institutions Reflection Profiling Syndicate, BIRPS，英国）、加拿大地质调查局、帝国理工学院（英国）、月球与行星研究所、墨西哥国立自治大学（Universidad Nacional Autónoma de México, UNAM）以及德克萨斯大学地球物理研究所（University of Texas Institute for Geophysics, UTIG）联合开展。海底地震仪（Ocean Bottom Seismometer, OBS）宽角与折射数据与反射数据同步采集，目前正与陆基宽角数据整合，以构建希克苏鲁伯撞击坑的速度结构模型。本联合项目旨在详细刻画希克苏鲁伯撞击坑的内部地壳结构与形貌，并定量确定其尺寸参数。