Waveform Modeling Applied to Three Deep Structure Problems: Slabs, D", and the Inner Core

波形建模应用于三个深层结构问题：板、D" 和内核

• 批准号: 9218693
• 负责人: Vernon Cormier
• 金额: $ 18.86万
• 依托单位: University of Connecticut
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-04-01 至 1997-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9218693&HistoricalAwards=false
• 关键词: Waveform; Modeling; Applied; Three; Deep

This research will study three widely separated areas of the earth with a common thread of theoretical waveform modeling that has been developed by earlier studies. Seismic body waves will be synthesized using approximate high frequency and hybrid approximate/finite difference techniques and compared to data waveforms to investigate characteristics from three zones: 1) the thickness, mantle penetration, and stratification of descending lithospheric slabs; 2) the heterospectrum of the lowermost D" region of the mantle and topography of the core-mantle boundary; and 3) the lateral variation and anisotropy of the elastic and anelastic structure of the inner core. The results of this research will include evidence for the existence or nature of slab penetration below 650 km; a test of the origin of a high frequency waveguide along the top of some slabs; a test of the applicability of the Born approximation to the study of PKIKP precursors and the importance of strong scattering within D"; and a test of an anelastic model of the inner core as an explanation for the observed amplitude, travel time, and frequency content for PKIKP.

这项研究将研究地球上三个广泛分离的区域，并采用早期研究开发的理论波形建模的共同线索。将采用近似高频和混合近似/有限差分技术合成地震体波，并与数据波形进行对比，从三个方面研究特征：1)下降岩石圈板块的厚度、地幔穿透和分层；2)地幔最下端D′区异质谱与核幔边界地形；(3)内核弹性和非弹性结构的横向变化和各向异性。这项研究的结果将包括650公里以下存在或存在板渗透的证据；对沿某些平板顶部的高频波导起源的测试；玻恩近似对PKIKP前体研究的适用性和D ‘ ’内强散射的重要性的检验；以及对内核的非弹性模型进行测试，以解释观测到的PKIKP的振幅、传播时间和频率内容。