کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4742160 | 1641553 | 2010 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Fine-scale topography of the Dâ³ discontinuity and its correlation to volumetric velocity fluctuations
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فیزیک زمین (ژئو فیزیک)
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چکیده انگلیسی
We constrained the correlation of the topography of the Dâ³ discontinuity to volumetric velocity fluctuations. We used data obtained from Hi-net tiltmeters deployed by the National Research Institute for Earth Science and Disaster Prevention, Japan, and conducted stacking and migration to map the discontinuity beneath the southwestern Pacific. We compared the obtained map with the distribution of ScS
- S travel time residuals, an index of volumetric velocity fluctuations in the lowermost mantle. We detected the fine-scale (of the order of a few hundred kilometers) topography of the Dâ³ discontinuity as well as fine-scale volumetric velocity fluctuations. Regions with relatively higher velocities generally have a discontinuity with shallower depths, and those with relatively lower velocities generally have a discontinuity with deeper depths. The scattering plot between the observed depths of the discontinuity and the observed ScS
- S residuals appears to exhibit a nonlinear trend. These results may suggest the existence of both thermal and chemical anomalies, such as those seen in thermochemical plumes.
- S travel time residuals, an index of volumetric velocity fluctuations in the lowermost mantle. We detected the fine-scale (of the order of a few hundred kilometers) topography of the Dâ³ discontinuity as well as fine-scale volumetric velocity fluctuations. Regions with relatively higher velocities generally have a discontinuity with shallower depths, and those with relatively lower velocities generally have a discontinuity with deeper depths. The scattering plot between the observed depths of the discontinuity and the observed ScS
- S residuals appears to exhibit a nonlinear trend. These results may suggest the existence of both thermal and chemical anomalies, such as those seen in thermochemical plumes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics of the Earth and Planetary Interiors - Volume 183, Issues 1â2, November 2010, Pages 126-135
Journal: Physics of the Earth and Planetary Interiors - Volume 183, Issues 1â2, November 2010, Pages 126-135
نویسندگان
Nozomu Takeuchi, Kazushige Obara,