Attenuation tomography of the upper inner core
The solidification of the Earth's inner core shapes its texture and rheology, affecting the attenuation and scattering of seismic body waves transmitted through it. Applying attenuation tomography in a Bayesian framework to 398 high‐quality PKIKP waveforms, we invert for the apparent Qp for the...
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| Veröffentlicht in: | Journal of geophysical research. Solid earth 2017-04, Vol.122 (4), p.3008-3032 |
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| container_title | Journal of geophysical research. Solid earth |
| container_volume | 122 |
| creator | Pejić, Tanja Tkalčić, Hrvoje Sambridge, Malcolm Cormier, Vernon F. Benavente, Roberto |
| description | The solidification of the Earth's inner core shapes its texture and rheology, affecting the attenuation and scattering of seismic body waves transmitted through it. Applying attenuation tomography in a Bayesian framework to 398 high‐quality PKIKP waveforms, we invert for the apparent Qp for the uppermost 400 km below the inner core boundary at latitudes 45°S to 45°N. We use damping and smoothing for regularization of the inversion, and it seems that the smoothing regularization combined with the discrepancy principle works better for this particular problem of attenuation tomography. The results are consistent with a regional variation in inner core attenuation more complex than hemispherical, suggesting coupling between inner core solidification and the thermal structure of the lowermost mantle.
Key Points
Attenuation tomography of the inner core performed from a global data set of waveform correlated measurements
Complex regional variations of attenuation
The observed pattern of attenuation is not in agreement with commonly accepted spherical degree 1 |
| doi_str_mv | 10.1002/2016JB013692 |
| format | Article |
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Key Points
Attenuation tomography of the inner core performed from a global data set of waveform correlated measurements
Complex regional variations of attenuation
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Key Points
Attenuation tomography of the inner core performed from a global data set of waveform correlated measurements
Complex regional variations of attenuation
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Solid earth</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Pejić, Tanja</au><au>Tkalčić, Hrvoje</au><au>Sambridge, Malcolm</au><au>Cormier, Vernon F.</au><au>Benavente, Roberto</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Attenuation tomography of the upper inner core</atitle><jtitle>Journal of geophysical research. Solid earth</jtitle><date>2017-04</date><risdate>2017</risdate><volume>122</volume><issue>4</issue><spage>3008</spage><epage>3032</epage><pages>3008-3032</pages><issn>2169-9313</issn><eissn>2169-9356</eissn><abstract>The solidification of the Earth's inner core shapes its texture and rheology, affecting the attenuation and scattering of seismic body waves transmitted through it. Applying attenuation tomography in a Bayesian framework to 398 high‐quality PKIKP waveforms, we invert for the apparent Qp for the uppermost 400 km below the inner core boundary at latitudes 45°S to 45°N. We use damping and smoothing for regularization of the inversion, and it seems that the smoothing regularization combined with the discrepancy principle works better for this particular problem of attenuation tomography. The results are consistent with a regional variation in inner core attenuation more complex than hemispherical, suggesting coupling between inner core solidification and the thermal structure of the lowermost mantle.
Key Points
Attenuation tomography of the inner core performed from a global data set of waveform correlated measurements
Complex regional variations of attenuation
The observed pattern of attenuation is not in agreement with commonly accepted spherical degree 1</abstract><cop>Washington</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1002/2016JB013692</doi><tpages>25</tpages><orcidid>https://orcid.org/0000-0001-7636-2647</orcidid><orcidid>https://orcid.org/0000-0001-8124-408X</orcidid><orcidid>https://orcid.org/0000-0003-2858-3175</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Attenuation Bayesian analysis Body waves Correlation analysis Damping Earth Earth core Earth science Frameworks Geophysics inner core Mantle Probability theory Regional variations Regularization Rheological properties Rheology Seismology Smoothing Solidification Texture Thermal structure Tomography Wave attenuation Waveforms |
| title | Attenuation tomography of the upper inner core |
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