Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/1141| DC Field | Value | Language |
|---|---|---|
| dc.contributor.authorall | Soldati, G.; INGV – Istituto Nazionale di Geofisica e Vulcanologia, Roma | en |
| dc.contributor.authorall | Boschi, L.; Universita’ di Napoli Federico II, Dipartimento di Fisica, Via Cintia, 80126, Naples, Italy | en |
| dc.contributor.authorall | Piersanti, A.; NGV – Istituto Nazionale di Geofisica e Vulcanologia, Roma | en |
| dc.date.accessioned | 2006-04-26T09:24:26Z | en |
| dc.date.available | 2006-04-26T09:24:26Z | en |
| dc.date.issued | 2002-10 | en |
| dc.identifier.uri | http://hdl.handle.net/2122/1141 | en |
| dc.description.abstract | We derive 3-D maps of the Earth’s mantle, CMB and outer core by means of least squares tomographic inversions. The data set includes compressional wave travel time measurements associated with the phases P, PcP, PKPbc, PKPdf, all based on the bulletins of the International Seismological Centre (1964-1995), after source relocation by Antolik et al. [2001]. Maps of the CMB derived independently from only core-reflected (PcP) or only core-refracted (PKP) phases are not well correlated. We study the radial coherence of whole-Earth tomographic images, to investigate potential trade-offs between CMB undulations and velocity anomalies in the mantle and/or outer core. We find that imaged lateral heterogeneities in the outer core are correlated with the topography of the CMB. This, together with the studies of Wahr and De Vries [1989] and Piersanti et al. [2001], suggests that the core anomalies might not be entirely fictitious. | en |
| dc.format.extent | 1153929 bytes | en |
| dc.format.mimetype | application/pdf | en |
| dc.language.iso | English | en |
| dc.subject | Earth’s mantle | en |
| dc.subject | tomographic | en |
| dc.title | Outer core density heterogeneity and the discrepancy between PKP and PcP travel time observations | en |
| dc.type | manuscript | en |
| dc.description.status | Submitted | en |
| dc.subject.INGV | 04. Solid Earth::04.01. Earth Interior::04.01.03. Mantle and Core dynamics | en |
| dc.relation.references | Antolik, M., G. Ekstr¨om, and A. M. Dziewonski, Global event location with full and sparse datasets using three-dimensional models of mantle P wave velocity, Pure Appl. Geophys., 158, 291–317, 2001. Antolik, M., Y., Gu, G. Ekstr¨om, and A. M. Dziewonski, A new joint model of compressional and shear wave velocity in the Earth’s mantle, submitted to Geophys. J. Int. Becker, T. W., and L. Boschi: A comparison of tomographic and geodynamic mantle models, Geochem. Geophys. Geosyst. , 3, 2001GC000168, 2002. Boschi, L., and A. M. Dziewonski, Whole Earth tomography from delay times of P, PcP, and PKP phases: Lateral heterogeneity in the outer core or radial anisotropy in the mantle?, J. Geophys. Res., 105, 13,675–13,696, 2000. Forte, A. M., A. M. Dziewonski, and R. L. Woodward, Aspherical structure of the mantle, tectonic plate motions, nonhydrostatic geoid, and topography of the core-mantle boundary, in Dynamics of the Earth’s Deep Interior and Earth Rotation, edited by J.-L. Le Mou¨el, D. E. Smylie and T. Herring, R. Soc., London, 1993. Forte, A. M., J. X. Mitrovica, and R. L. Woodward, Seismic-geodynamic determination of the origin of the excess ellipticity of the core-mantle boundary, Geophys. Res. Lett., 22, 1013–1016, 1995. Kohler, M. D., and T. Tanimoto, One-layer global inversion for outermost core velocity, Phys. Earth Planet. Inter., 72, 173–184, 1992. Mooney, W., G. Laske, and G. Masters, Crust 5.1: a global crustal model at 5£5 degrees, J. Geophys. Res., 103, 727–747, 1998. Morelli, A., and A. M. Dziewonski, Topography of the core-mantle boundary and lateral homogeneity of the liquid core, Nature, 325, 678–683, 1987. Obayashi M., and Fukao Y., P and PcP travel time tomography for the core-mantle boundary, J. Geophys. Res., 102, 17825–17841, 1997. Piersanti, A., L. Boschi, and A. M. Dziewonski, Estimating lateral structure in the Earth’s outer core, Geophys. Res. Lett., 28, 1659–1662, 2001. Press, W.H., S.A. Teukolski, W.T. Vetterling, and B.P. Flannery, Numerical Recipes in Fortran, 2nd ed., Cambridge Univ. Press, New York, 1992. Ritzwoller, M. H., G. Masters, and F. Gilbert, Observations of anomalous splitting and their interpretation in terms of aspherical structure, J. Geophys. Res., 91, 10203–10228, 1986. Rodgers, A., and J. Wahr, Inference of core-mantle boundary topography from ISC PcP and PKP traveltimes, Geophys. J. Int., 115, 991–1011, 1993. Stevenson, D. J., Limits on lateral density and velocity variations in the Earth’s outer core, Geophys. J. R. Astron. Soc., 88, 311–319, 1987. Vasco, D.W., and L.R. Johnson, Whole Earth structure estimated from seismic arrival times, J. Geophys. Res.,103, 2633–2671, 1998. Wahr, J. H., and D. de Vries, The possibility of lateral structure inside the core and its implications for nutation and Earth tide observations, Geophys. J. Int., 99, 511–519, 1989. Widmer., R., G. Masters, and F. Gilbert, Observably split multiplets-data analysis and interpretation in terms of large-scale aspherical structure, Geophys. J. R. Astron. Soc., 111, 559–576, 1992. | en |
| dc.description.fulltext | open | en |
| dc.contributor.author | Soldati, G. | en |
| dc.contributor.author | Boschi, L. | en |
| dc.contributor.author | Piersanti, A. | en |
| dc.contributor.department | INGV – Istituto Nazionale di Geofisica e Vulcanologia, Roma | en |
| dc.contributor.department | Universita’ di Napoli Federico II, Dipartimento di Fisica, Via Cintia, 80126, Naples, Italy | en |
| dc.contributor.department | NGV – Istituto Nazionale di Geofisica e Vulcanologia, Roma | en |
| item.openairetype | manuscript | - |
| item.cerifentitytype | Publications | - |
| item.languageiso639-1 | en | - |
| item.grantfulltext | open | - |
| item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
| item.fulltext | With Fulltext | - |
| crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma1, Roma, Italia | - |
| crisitem.author.dept | Università degli Studi di Padova | - |
| crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma1, Roma, Italia | - |
| crisitem.author.orcid | 0000-0002-9048-201X | - |
| crisitem.author.orcid | 0000-0002-1814-5721 | - |
| crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
| crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
| crisitem.classification.parent | 04. Solid Earth | - |
| Appears in Collections: | Article published / in press Manuscripts | |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| GRLoutercore2002.pdf | 1.13 MB | Adobe PDF | View/Open |
Page view(s) 50
200
checked on Apr 17, 2024
Download(s) 50
201
checked on Apr 17, 2024
