High-Resolution Digital Seismic Reflection Depth Transect, Ontong Java Plateau to Nauru Basin

翁通爪哇高原至瑙鲁盆地的高分辨率数字地震反射深度断面

• 批准号: 8710220
• 负责人: Edward Winterer
• 金额: $ 9.78万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-09-01 至 1991-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8710220&HistoricalAwards=false
• 关键词: Resolution; Digital; Seismic; Reflection; Depth

The history of the climate is recorded in deep sea sediments and reflection seismology is one of the principal methods of studying these sediments. Yet we have a poor understanding of the relation between observed seismic reflection records and variations in physical properties of deep sea sediments. In order to investigate the relationship between the observed sequence of seismic reflections in the deep ocean and various physical and chemical oceanographic events over the last 30 million years the principal investigators propose to collect high resolution seismic data on the Ontong Java Plateau where water depths range from 2000 meters to 4500 meters and where a series of existing and proposed drill holes provide a detailed record of oceanographic events over this time period. This region is one of the few regions of the world where seismic lines can be run continuously over this depth range without encountering major structural or erosional interruption. This depth range is critical because sediments deposited in depths of 4500 meters will have experienced considerable dissolution of carbonate, a major component of the sediment record; sediments as shallow as 2000 meters will not have experienced this dissolution. It is thought that the seismic reflection record in the deep Pacific Ocean is related to periods of varying degrees of dissolution. It is not known what causes the impedence contrasts that produce the reflection record in shallower waters away from sources of terrigenous sediment. Seismic lines tying directly from the deep ocean to intermediate depths will be important in advancing our understanding of observed seimic records.

气候的历史记录在深海沉积物中， 反射地震学是研究地震的主要方法之一， 这些沉积物。然而，我们对这种关系的理解很差， 观测到的地震反射记录和 深海沉积物的物理性质。 为了 研究观察到的序列之间的关系 深海地震反射和各种物理和 在过去的3000万年里， 主要研究人员建议收集高分辨率 翁东爪哇高原的地震数据，水深范围从 2000米到4500米， 和建议的钻孔提供了详细的记录， 这一时期的海洋事件。 该地区是一个 在世界上少数几个可以架设地震测线的地区， 在这个深度范围内连续不断地进行， 结构或侵蚀中断。 这个深度范围是 因为沉积物沉积在4500米深处 将经历碳酸盐的大量溶解， 沉积物记录的主要组成部分;沉积物浅， 2000米不会经历这种溶解。 是 认为太平洋深处的地震反射记录 海洋与不同程度的溶解期有关。 目前还不清楚是什么原因造成的阻抗对比，产生 远离震源的较浅沃茨的反射记录 陆源沉积物 地震测线直接连接深海 到中间深度将是重要的， 了解观察到的地震记录。