Investigation of the subaerial Ganges-Brahmaputra-Meghna Delta stratigraphy and tectonic using high-resolution multichannel seismics

利用高分辨率多道地震研究空中恒河-雅鲁藏布江-梅格纳三角洲地层和构造

• 批准号: 214147652
• 负责人: Dr. Tilmann Schwenk
• 金额: --
• 依托单位: Fachgebiet Meerestechnik - Umweltforschung
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/214147652?language=en
• 关键词: Investigation; subaerial; Ganges; Brahmaputra; Meghna

We propose to image the sedimentary structure of the Ganges-Brahmaputra-Meghna Delta by means of high-resolution multichannel air-gun seismic and boomer seismic. Seismic surveys shall be carried out on the river network of Bangladesh as well as on areas extensively flooded at the end of the monsoon season. Main goals will be the imaging of the Holocene stratigraphy of the delta, the mapping of blind tectonic structures and the identification of buried river valleys. The seismic data sets will lead to an integrated analysis and combined interpretation, embedded in the international project “Life on a tectonically active delta – convergence of Earth-science and geohazard research in Bangladesh with education and capacity building”, which has been funded by the U.S. National Science Foundation for 2010-2015. In particular, 250 drillings down to the Pleistocene base of the delta will be carried out within this project, and the here proposed seismic data shall be used as pre-site survey database, and will also give the opportunity to link the stratigraphy between the boreholes. Together with resistivity data, GPS data and modelling results, (also parts of the project), the whole bundle of data sets will help to understand the development of this tectonically active and densely populated delta. The results will improve the geohazard assessment for more than 150 million peoples in times of changing monsoon climate and sea-level rises.

本文提出了利用高分辨率多道气枪地震和Boomer地震对恒河-雅鲁藏布江-梅克纳三角洲沉积构造进行成像的方法。应在孟加拉国的河流网络以及季风季节结束时被广泛淹没的地区进行地震勘测。主要目标将是三角洲全新世地层的成像、隐蔽构造的测绘和埋藏河谷的识别。地震数据集将导致综合分析和综合解释，嵌入国际项目“构造活跃三角洲上的生命-孟加拉国地球科学和地质灾害研究与教育和能力建设的融合”，该项目由美国国家科学基金会资助，2010-2015年。特别是，在本项目内将进行250次钻探，直至三角洲的更新世基底，此处提出的地震数据应用作现场前调查数据库，并将有机会将钻孔之间的地层联系起来。连同电阻率数据、GPS数据和建模结果（也是项目的一部分），整个数据集将有助于了解这个构造活跃和人口密集的三角洲的发展。在季风气候变化和海平面上升时期，研究结果将改善对1.5亿多人的地质灾害评估。