PRISM3D: a 3-D reference seismic model for Iberia and adjacent areas
22 pages, 17 figures, 2 tables, supporting information https://doi.org/10.1093/gji/ggab005
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| Language: | English |
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Oxford University Press
2021-05
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| Subjects: | Seismology, Surface waves and free oscillations, Seismicity and tectonics, Body waves, Structure of the Earth, Composition and structure of the mantle, Composition and structure of the continental crust, |
| Online Access: | http://hdl.handle.net/10261/239857 http://dx.doi.org/10.13039/100007691 http://dx.doi.org/10.13039/501100001602 http://dx.doi.org/10.13039/501100011033 |
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Seismology Surface waves and free oscillations Seismicity and tectonics Body waves Structure of the Earth Composition and structure of the mantle Composition and structure of the continental crust Seismology Surface waves and free oscillations Seismicity and tectonics Body waves Structure of the Earth Composition and structure of the mantle Composition and structure of the continental crust |
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Seismology Surface waves and free oscillations Seismicity and tectonics Body waves Structure of the Earth Composition and structure of the mantle Composition and structure of the continental crust Seismology Surface waves and free oscillations Seismicity and tectonics Body waves Structure of the Earth Composition and structure of the mantle Composition and structure of the continental crust Arroucau, P. Custódio, S. Civiero, C. Silveira, G. Dias, N. Diaz, J. Villaseñor, Antonio Bodin, T. PRISM3D: a 3-D reference seismic model for Iberia and adjacent areas |
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22 pages, 17 figures, 2 tables, supporting information https://doi.org/10.1093/gji/ggab005 |
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Science Foundation Ireland |
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Science Foundation Ireland Arroucau, P. Custódio, S. Civiero, C. Silveira, G. Dias, N. Diaz, J. Villaseñor, Antonio Bodin, T. |
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artículo |
| topic_facet |
Seismology Surface waves and free oscillations Seismicity and tectonics Body waves Structure of the Earth Composition and structure of the mantle Composition and structure of the continental crust |
| author |
Arroucau, P. Custódio, S. Civiero, C. Silveira, G. Dias, N. Diaz, J. Villaseñor, Antonio Bodin, T. |
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Arroucau, P. |
| title |
PRISM3D: a 3-D reference seismic model for Iberia and adjacent areas |
| title_short |
PRISM3D: a 3-D reference seismic model for Iberia and adjacent areas |
| title_full |
PRISM3D: a 3-D reference seismic model for Iberia and adjacent areas |
| title_fullStr |
PRISM3D: a 3-D reference seismic model for Iberia and adjacent areas |
| title_full_unstemmed |
PRISM3D: a 3-D reference seismic model for Iberia and adjacent areas |
| title_sort |
prism3d: a 3-d reference seismic model for iberia and adjacent areas |
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Oxford University Press |
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2021-05 |
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http://hdl.handle.net/10261/239857 http://dx.doi.org/10.13039/100007691 http://dx.doi.org/10.13039/501100001602 http://dx.doi.org/10.13039/501100011033 |
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1777667435553357824 |
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dig-icm-es-10261-2398572021-06-07T12:49:48Z PRISM3D: a 3-D reference seismic model for Iberia and adjacent areas Arroucau, P. Custódio, S. Civiero, C. Silveira, G. Dias, N. Diaz, J. Villaseñor, Antonio Bodin, T. Science Foundation Ireland Geological Survey of Ireland Universidade da Beira Interior Agencia Estatal de Investigación (España) Diaz, J. [0000-0003-1801-0541] Seismology Surface waves and free oscillations Seismicity and tectonics Body waves Structure of the Earth Composition and structure of the mantle Composition and structure of the continental crust 22 pages, 17 figures, 2 tables, supporting information https://doi.org/10.1093/gji/ggab005 We present PRISM3D, a 3-D reference seismic model of P- and S-wave velocities for Iberia and adjacent areas. PRISM3D results from the combination of the most up-to-date earth models available for the region. It extends horizontally from 15°W to 5°E in longitude, 34°N to 46°N in latitude and vertically from 3.5 km above to 200 km below sea level, and is modelled on a regular grid with 10 and 0.5 km of grid node spacing in the horizontal and vertical directions, respectively. It was designed using models inferred from local and teleseismic body-wave tomography, earthquake and ambient noise surface wave tomography, receiver function analysis and active source experiments. It includes two interfaces, namely the topography/bathymetry and the Mohorovičić (Moho) discontinuity. The Moho was modelled from previously published receiver function analysis and deep seismic sounding results. To that end we used a probabilistic surface reconstruction algorithm that allowed to extract the mean of the Moho depth surface along with its associated standard deviation, which provides a depth uncertainty estimate. The Moho depth model is in good agreement with previously published models, although it presents slightly sharper gardients in orogenic areas such as the Pyrenees or the Betic-Rif system. Crustal and mantle P- and S-wave wave speed grids were built separately on each side of the Moho depth surface by weighted average of existing models, thus allowing to realistically render the speed gradients across that interface. The associated weighted standard deviation was also calculated, which provides an uncertainty estimation on the average wave speed values at any point of the grid. At shallow depths (<10 km), low P and S wave speeds and high VP/VS are observed in offshore basins, while the Iberian Massif, which covers a large part of western Iberia, appears characterized by a rather flat Moho, higher than average VP and VS and low VP/VS. Conversely, the Betic-Rif system seems to be associated with low VP and VS, combined with high VP/VS in comparison to the rest of the study area. The most prominent feature of the mantle is the well known high wave speed anomaly related to the Alboran slab imaged in various mantle tomography studies. The consistency of PRISM3D with previous work is verified by comparing it with two recent studies, with which it shows a good general agreement.The impact of the new 3-D model is illustrated through a simple synthetic experiment, which shows that the lateral variations of the wave speed can produce traveltime differences ranging from –1.5 and 1.5 s for P waves and from –2.5 and 2.5 s for S waves at local to regional distances. Such values are far larger than phase picking uncertainties and would likely affect earthquake hypocentral parameter estimations. The new 3-D model thus provides a basis for regional studies including earthquake source studies, Earth structure investigations and geodynamic modelling of Iberia and its surroundings. This publication is supported by the FCT project SPIDER - Seismogenic processes in slowly deforming regions (PTDC/GEO-FIQ/2590/2014). The work presented is a contribution to FCT UIDB/50019/2020 IDL. P. Arroucau acknowledges support from Science Foundation Ireland (grant 13/CDA/2192) and from the Geological Survey of Ireland (grant 2016-PD-06). C. Civiero was supported by the Science Foundation Ireland, the Geological Survey of Ireland, and the Marine Institute (grants 13/CDA/2192 and 16/IA/4598). Figures were plotted using the GMT - Generic Mapping Tools software (Wessel & Smith 1998) and Python Matplotlib and Basemap packages. NonLinLoc was used for the forward computation of arrival times (Lomax et al. 2000). We also wish to thank Catarina Matos for the tests she performed on an early version of the model. With the funding support of the ‘Severo Ochoa Centre of Excellence’ accreditation (CEX2019-000928-S), of the Spanish Research Agency (AEI). Peer reviewed 2021-05-05T08:45:28Z 2021-05-05T08:45:28Z 2021-05 artículo http://purl.org/coar/resource_type/c_6501 Geophysical Journal International, 22(2): 789–810 (2021) 0956-540X CEX2019-000928-S http://hdl.handle.net/10261/239857 10.1093/gji/ggab005 1365-246X http://dx.doi.org/10.13039/100007691 http://dx.doi.org/10.13039/501100001602 http://dx.doi.org/10.13039/501100011033 en Publisher's version https://doi.org/10.1093/gji/ggab005 Sí open Oxford University Press |