Probing the Earth's Core

探测地核

• 批准号: 9506708
• 负责人: Xiaodong Song
• 金额: $ 10万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-09-01 至 1997-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9506708&HistoricalAwards=false
• 关键词: Probing; Earth; Core

9506708 SONG This research is to model recordings of seismic waves travelling through the earth's core to recover its detailed structure. The inner core, from earlier work, is confirmed to be anisotropic, possessing a cylindrical symmetry around the earth spin axis with the N-S direction 3% faster in P-wave velocity than the E-W direction. The very top 60 km of the inner core appears not to be anisotropic with the interval from 60 to 150 km being a transition region. Several questions remain including the details of the anisotropy and the nature of the isotropic region near the inner core boundary. The theoretically possible, but undetected, phase PKJKP will be sought again in light of the new information on anisotropy. The answer to these questions bear on the nature of the earth's magnetic field, and the composition and physics of the core's material. ***

9506708歌曲这项研究是为了模拟穿越地球核心的地震波的录音，以恢复其详细的结构。 从早期的工作中，内核被证实为各向异性，在地球旋转轴周围具有圆柱形对称性，而N-S方向的P波速度比E-W方向快3％。 内核的前60公里似乎并不是各向异性的，间隔从60到150 km，是一个过渡区域。 仍然存在几个问题，包括各向异性的细节和内核边界附近的各向同性区域的性质。 根据有关各向异性的新信息，将再次寻求理论上可能但未被发现的PKJKP相。 这些问题的答案对地球磁场的性质以及核心材料的组成和物理。 ***