Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017GL075463 |
Estimate of the Rigidity of Eclogite in the Lower Mantle From Waveform Modeling of Broadband S-to-P Wave Conversions | |
Haugland, Samuel M.1; Ritsema, Jeroen1; Kaneshima, Satoshi2; Thorne, Michael S.3 | |
2017-12-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:23 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Japan |
英文摘要 | Broadband USArray recordings of the 21 July 2007 western Brazil earthquake (M-w=6.0; depth = 633 km) include high-amplitude signals about 40 s, 75 s, and 100 s after the P wave arrival. They are consistent with S wave to P wave conversions in the mantle beneath northwestern South America. The signal at 100 s, denoted as S1750P, has the highest amplitude and is formed at 1,750 km depth based on slant-stacking and semblance analysis. Waveform modeling using axisymmetric, finite difference synthetics indicates that S1750P is generated by a 10 km thick heterogeneity, presumably a fragment of subducted mid-ocean ridge basalt in the lower mantle. The negative polarity of S1750P is a robust observation and constrains the shear velocity anomaly delta V-S of the heterogeneity to be negative. The amplitude of S1750P indicates that delta V-S is in the range from - 1.6% to - 12.4%. The large uncertainty in delta V-S is due to the large variability in the recorded S1750P amplitude and simplifications in the modeling of S1750P waveforms. The lower end of our estimate for delta V-S is consistent with ab initio calculations by Tsuchiya (2011), who estimated that delta V-S of eclogite at lower mantle pressure is between 0 and - 2% due to shear softening from the poststishovite phase transition. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000419102400011 |
WOS关键词 | MID-LOWER MANTLE ; STISHOVITE PHASE-TRANSITION ; SUBDUCTED BASALTIC CRUST ; SEISMIC SCATTERERS ; OCEANIC-CRUST ; DISCONTINUITY ; HETEROGENEITIES ; BENEATH ; TRANSFORMATIONS ; ELASTICITY |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/28659 |
专题 | 气候变化 |
作者单位 | 1.Univ Michigan, Dept Earth & Environm Sci, Ann Arbor, MI 48109 USA; 2.Kyushu Univ, Dept Earth & Planetary Sci, Fukuoka, Japan; 3.Univ Utah, Dept Geol & Geophys, Salt Lake City, UT 84112 USA |
推荐引用方式 GB/T 7714 | Haugland, Samuel M.,Ritsema, Jeroen,Kaneshima, Satoshi,et al. Estimate of the Rigidity of Eclogite in the Lower Mantle From Waveform Modeling of Broadband S-to-P Wave Conversions[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(23). |
APA | Haugland, Samuel M.,Ritsema, Jeroen,Kaneshima, Satoshi,&Thorne, Michael S..(2017).Estimate of the Rigidity of Eclogite in the Lower Mantle From Waveform Modeling of Broadband S-to-P Wave Conversions.GEOPHYSICAL RESEARCH LETTERS,44(23). |
MLA | Haugland, Samuel M.,et al."Estimate of the Rigidity of Eclogite in the Lower Mantle From Waveform Modeling of Broadband S-to-P Wave Conversions".GEOPHYSICAL RESEARCH LETTERS 44.23(2017). |
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