Study of Inner Core Motions using Seismic Waveform Doublets
利用地震波形双峰研究内核运动
基本信息
- 批准号:0510641
- 负责人:
- 金额:$ 22.5万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2005
- 资助国家:美国
- 起止时间:2005-06-01 至 2008-05-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
This project is to study time-dependent features of the inner core, including inner core rotation, based on measurements made on seismic waves derived from waveform doublets. (Waveform doublets are the seismic signals from two earthquakes occurring at different times but in almost exactly the same location, so that their waveforms look very similar at each station recording both events.) The new approach, based on a search for waveform doublets, avoids contamination from unknown lateral heterogeneities in the Earth and allows the research to focus on the interpretation of very precise measurements of the travel-time change between doublets signals that have traversed the inner core.The intellectual merit of this approach is that it promotes recognition of the dynamic nature of the Earth's deepest interior; and that it has implications for the big picture of how our planet differentiated, and the degree of vigor with which convection in the fluid core is maintained. By measuring changes within the inner core on a time scale that can lead to perceptible effects over a decade or less, there are consequences in the study of Earth's overall heat flow and energy balance; geomagnetism; and gravity, as well as seismology. (These are the four geophysical disciplines associated with observable features measurable at the Earth's surface).The work has broader impact because (a) it is a new twist on research that led to hundreds of news stories in the 1990s; (b) it is quite easily understandable by people of all ages who lack scientific training but who are curious about the planet on which we live; and most fundamentally because (c) the inner core, as a Moon-sized object apparently moving inside the Earth, is a fascinating object, and the background to good stories of how science is done.The investigator's methods for studying travel-time change are also a contribution within the general subject of precision seismology, in which even teleseismic signals are measured with attention to travel time changes at the level of ~ 10 milliseconds. The discovery of new waveform doublets in subduction zones is of great interest in the context of earthquake physics, whether the events occur close together in time or are separated by several years.
本项目的目的是根据对波形偶产生的地震波进行的测量,研究内核随时间变化的特征,包括内核的旋转。(双重波形是两次地震的地震信号,它们发生在不同的时间,但几乎完全相同的位置,因此它们的波形在记录这两个事件的每个台站看起来非常相似。这种新的方法以寻找波形偶线为基础,避免了地球中未知的横向不均匀性的污染,使研究能够集中于对穿过内核的偶线信号之间的旅行时间变化的非常精确的测量结果进行解释,这种方法的智力优点是,它促进了对地球最深内部动态性质的认识;它对我们的星球是如何分化的,以及流体核心中对流维持的活力程度的大图景有影响。通过测量内核在时间尺度上的变化,可以在十年或更短的时间内产生可感知的影响,对地球的整体热流和能量平衡、地磁、重力以及地震学的研究产生影响。(这是与在地球表面可测量的可观测特征有关的四个地球物理学科)这项工作具有更广泛的影响,因为(a)它是研究的一个新转折,在1990年代导致了数百个新闻故事;(B)它很容易被所有年龄段的人理解,他们缺乏科学训练,但对我们生活的星球感到好奇;最根本的原因是(c)内核,作为一个月球大小的物体,显然在地球内部移动,是一个迷人的物体,是科学如何完成的好故事的背景。研究人员研究旅行时间变化的方法也是精密地震学一般学科的贡献,其中,即使是微重力信号也是在注意到传播时间变化在~ 10毫秒的水平下测量的。在俯冲带中发现新的波形双峰在地震物理学中具有极大的意义,无论事件发生在时间上是接近的还是相隔几年。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Paul Richards其他文献
Novel protein targets for organophosphorus compounds.
有机磷化合物的新型蛋白质靶标。
- DOI:
10.1016/s0009-2797(99)00064-2 - 发表时间:
1999 - 期刊:
- 影响因子:5.1
- 作者:
Paul Richards;Martin Johnson;David Ray;Colin Walker - 通讯作者:
Colin Walker
Differential effects of serotonin antagonists on hypothermia and stereotyped behavior induced by apomorphine and lergotrile in rats : a thesis ..
血清素拮抗剂对阿朴吗啡和麦角曲引起的大鼠体温过低和刻板行为的不同影响:一篇论文..
- DOI:
- 发表时间:
2020 - 期刊:
- 影响因子:0
- 作者:
R. Wade;Lee M. Wade;Harry Krewsun;M. Berman;J. Byrne;M. Namba;Paul Richards;R. Saroyan - 通讯作者:
R. Saroyan
GLP1- and GIP-producing cells rarely overlap and differ by bombesin receptor-2 expression and responsiveness.
GLP1 和 GIP 生成细胞很少重叠,并且铃蟾肽受体 2 表达和反应性也有所不同。
- DOI:
- 发表时间:
2016 - 期刊:
- 影响因子:4
- 作者:
B. Svendsen;Ramona Pais;M. S. Engelstoft;N. Milev;Paul Richards;C. Christiansen;Kristoffer L. Egerod;Signe M. Jensen;A. Habib;F. Gribble;T. Schwartz;F. Reimann;J. Holst - 通讯作者:
J. Holst
Color and Sound: Synaesthesia at the Crossroads of Music and Science a Dissertation Presented to the Graduate School of the University of Florida in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy
颜色与声音:音乐与科学十字路口的联觉向佛罗里达大学研究生院提交的论文,部分满足哲学博士学位的要求
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
Matthew McCabe;My Teachers;Benjamin Broening;Elainie Lillios;Mikel Kuehn;James Paul Sain;Russell Robinson;Paul Richards;Jamie Reilly;Lise Abrams;Linda Hermer;Amy Corning;Rick Dietrich;Cain Norris;Ben Baldwin;Berkeley;G. Hoflund;Russell Brown;Heather Mcreynolds;Stefanie Acevedo;Joo Won Park;Mike Solomon;Kyle Vegter - 通讯作者:
Kyle Vegter
Project-based learning in an Eigogaku course
- DOI:
10.1075/pl.23005.ric - 发表时间:
2023-09 - 期刊:
- 影响因子:0
- 作者:
Paul Richards - 通讯作者:
Paul Richards
Paul Richards的其他文献
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{{ truncateString('Paul Richards', 18)}}的其他基金
Planar-Antenna-coupled Superconducting Bolometer Arrays for Submillimeter and Millimeter Astrophysics
用于亚毫米和毫米天体物理学的平面天线耦合超导辐射热计阵列
- 批准号:
0352992 - 财政年份:2004
- 资助金额:
$ 22.5万 - 项目类别:
Continuing Grant
Two Searches for Observational Evidence of Inner Core Rotation
对内核旋转观测证据的两次搜索
- 批准号:
0125691 - 财政年份:2002
- 资助金额:
$ 22.5万 - 项目类别:
Standard Grant
Superconducting Bolometer Arrays for Far-Infrared and Millimeter-wave Astrophysics
用于远红外和毫米波天体物理学的超导辐射热计阵列
- 批准号:
0096933 - 财政年份:2001
- 资助金额:
$ 22.5万 - 项目类别:
Continuing Grant
Voltage-Biased Superconducting Bolometers For Far Infrared and Millimeter-Wave Astrophysics
用于远红外和毫米波天体物理学的偏置电压超导辐射热测量计
- 批准号:
9731200 - 财政年份:1998
- 资助金额:
$ 22.5万 - 项目类别:
Continuing Grant
Improved Estimates of the Rotation Rate of the Earth's Inner Core
改进对地球内核自转速率的估计
- 批准号:
9805245 - 财政年份:1998
- 资助金额:
$ 22.5万 - 项目类别:
Standard Grant
Analytic Studies of Seismic Waves in 3-D Structures
3-D 结构中地震波的分析研究
- 批准号:
8708564 - 财政年份:1987
- 资助金额:
$ 22.5万 - 项目类别:
Continuing Grant
Numerical Studies of Attenuating Seismic Waves
衰减地震波的数值研究
- 批准号:
8608288 - 财政年份:1986
- 资助金额:
$ 22.5万 - 项目类别:
Continuing grant
Rocket-Borne Radiometry of the Submillimeter Diffuse Astrophysical Background
亚毫米漫射天体物理背景的火箭发射辐射测量
- 批准号:
8312055 - 财政年份:1984
- 资助金额:
$ 22.5万 - 项目类别:
Standard Grant
Quantitative Studies of High Frequency Strong Ground Motion
高频强地震动的定量研究
- 批准号:
8023170 - 财政年份:1981
- 资助金额:
$ 22.5万 - 项目类别:
Continuing grant
Fundamental Studies of Spontaneous Earthquake Faulting Models
自发地震断层模型的基础研究
- 批准号:
8007426 - 财政年份:1980
- 资助金额:
$ 22.5万 - 项目类别:
Continuing grant
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