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Title

Deep seismic reflection profile (IBERSEIS Normal Incidence Transect)

Other TitlesIBERSEIS NI - raw data
AuthorsPérez-Estaún, Andrés CSIC; Simancas, José Fernando; González-Lodeiro, Francisco; Ayarza, P.; Azor, Antonio CSIC ORCID; Juhlin, C.; Sáez, R.; Almodóvar, G. R.; Carbonell, Ramón CSIC ORCID
KeywordsField
Seismic:Active:MCS
DigitalSeg
SEGY
Seismic:Reflection
Seismometer_SingleFrequency
SeismicSource_VibroseisTruck
Issue Date4-Nov-2019
PublisherDIGITAL.CSIC
CitationPérez-Estaún, A., Simancas, J. F., González Lodeiro, F., Ayarza, P., Azor, A., Juhlin, C., Sáez, R., Almodóvar, G. R., and Carbonell, R.; 2001; "Deep high resolution seismic reflection profile (IBERSEIS Transect) [Dataset]"; DIGITAL.CSIC; http://dx.doi.org/10.20350/digitalCSIC/9016
AbstractIBERSEIS Normal Incidence (IBERSEIS-NI) is a NE-SW oriented deep seismic reflection profile that provided for the first time a complete section at crustal scale of the Variscan Iberian Massif in the SW of Spain. This seismic profile samples three major tectonic terranes: the South Portuguese Zone, the Ossa-Morena Zone, and the Central Iberian Zone. These terranes show a distinctive seismic signature, as do the sutures separating them. Late strike-slip movements through crustal wedges are apparent in the seismic image and have strongly modified the geometry of sutures. The upper crust appears to be decoupled from the lower crust all along the seismic line, but some deformation has been accommodated at deeper levels. A sill-like structure is imaged in the middle crust as a 1–2 s thick and 175 km long high-amplitude conspicuous reflective band. It is interpreted as a great intrusion of mafic magma in a mid-crustal decollement. Taking into account surface geological data and the revealed crustal architecture, a tectonic evolution is proposed for SW Iberia which includes transpressional collision interacting during Early Carboniferous with a mantle plume. The Moho can be identified along the entire transect as subhorizontal and located at 10 to 11 s, indicating a 30–35 km average crustal thickness. Its seismic signature changes laterally, being very reflective beneath the South Portuguese Zone and the Central Iberian Zone, but discontinuous and diffuse below the Ossa Morena Zone.
DescriptionIBERSEIS is a 303 km long deep seismic reflection profile. The transect was recorded in 56 days (from May to July 2001) using a 400 channel SERCEL 388 and five 22 Ton Vibroseis trucks. The asymmetric split spread configuration changed along the profile according to the dips of outcropping structures. To achieve a high resolution at shallow levels and to image steep dips, a 35 m station spacing and a 70 m Vibration Point interval was used with a high fold (60 in average). A relatively long sweep (20 s) was chosen to increase the source energy rather than increasing the number of sweeps per Vibration Point. The migrated and stack dataset derived from this raw data are available in http://hdl.handle.net/10261/220989
IBERSEIS NI: Migrated and stack files: http://dx.doi.org/10.20350/digitalCSIC/12643 ; http://hdl.handle.net/10261/220989
URIhttp://hdl.handle.net/10261/193954
DOI10.20350/digitalCSIC/9016
ReferencesAyarza, P., Carbonell, R., Palomeras, I., Ehsan, S. A., Afonso, J. C., and Diaz, J. (2015). Mapping the Hales discontinuity in southwestern Spain. International Union of Geodesy and Geophysics. http://diposit.ub.edu/dspace/handle/2445/65254
Ehsan, S. A. (2014). Seismic characterization of the Central Iberian Zone from the surface to the upper mantle. PhD Thesis
Simancas, J. F., Ayarza, P.,Azor, A., Carbonell, R., Martínez Poyatos, D., Pérez-Estaún, A.,and González Lodeiro, F. (2013). A seismic geotraverse across the Iberian Variscides: Orogenic shortening, collisional magmatism, and orocline development. Tectonics, vol. 32, 417-432. https://doi.org/10.1002/tect.20035
Carbonell, R., Levander, A., and Kind, R. (2013). TheMohorovičić discontinuity beneath the continental crust: An overview of seismic constraints. Tectonophysics 609, 353-376. http://dx.doi.org/10.1016/j.tecto.2013.08.037
Martínez Poyatos, D., Carbonell, R., Palomeras, I., Simancas, J. F., Ayarza, P., Martí, D., Azor, A., Jabaloy, A., González Cuadra, P., Tejero, R., Martín Parra, L.M., Matas, J., González Lodeiro, F., Pérez-Estaún, A., García Lobón, J. L., and Mansilla, L. (2012). Imaging the curstal structure of the Central Iberian Zone (Variscan Belt): The ALCUDIA deep seismic reflection transect. Tectonics, vol. 31, TC3017. https://doi.org/10.1029/2011TC002995
Brown, D., Zhang, X., Palomera, I., Simancas, F., Carbonell, R., Juhlin, C., and Salisbury, M. (2012). Petrophysical analysis of a mid-crustal reflector in the IBERSEIS profile, SW Spain. Tectonophysics, vol. 550-553, pp. 35-46. https://doi.org/10.1016/j.tecto.2012.05.004
Palomeras, I., Carbonell, R., Ayarza, P., Fernàndez, M., Simancas, J.F., Martínez Poyatos, D., González Lodeiro, F., and Pérez-Estaún, A. (2011). Geophysical model of the lithosphere across the Variscan Belt of SW-Iberia: Multidisciplinary assessment. Tectonophysics 508, 42-51. https://doi.org/10.1016/j.tecto.2010.07.010
Carbonell, R., Simancas. F ., Martínez-Poyatos, D., Ayarza, P., Palomeras, I., Jabaloy, A., Gonzalez, P., Tejero, R., Matas, J., Martín-Parra, L., Azor, A., González-Lodeiro, F., García­Lobón, L., Pérez-Estaún, A., and Mansilla, L. (2008). New constraints on crustal structure of the southern Iberian Variscaides from deep seismic reflection profiles (IBERSEIS, ALCUDIA Projects). The 33rd International Geological Congress, Oslo, Norway, August 2008. http://www.earthscrust.org.au/reports/large-scale-transects.html
Palomeras, I., Fernández, M., Carbonell, R., Simancas. F., Ayarza, P., Martínez-Poyatos, D., Azor, A., González-Lodeiro, F., and Pérez-Estaún, A. (2008). A large seismic transect across the variscan belt of SW-Iberia: A multidisciplinary view. The 33rd International Geological Congress, Oslo, Norway, August 2008. http://www.earthscrust.org.au/reports/large-scale-transects.html
Ayarza, P., Palomeras, I., Simancas. F., Carbonell, R., Martínez-Poyatos, D., Azor, A., Pérez-Estaún, A., and González-Lodeiro, F. (2008). An upper mantle reflector beneath SW Iberia. Location and seismic constraints. The 33rd International Geological Congress, Oslo, Norway, August 2008. http://www.earthscrust.org.au/reports/large-scale-transects.html
Gaite, B., Palomeras, I., and Carbonell, R. (2008). Deep seismic reflection transects within the iberian peninsula: A geophysical data base. The 33rd International Geological Congress, Oslo, Norway, August 2008. http://www.earthscrust.org.au/reports/large-scale-transects.html
Schmelzbach, C., Simancas, J.F., Juhlin, C., and Carbonell, R. (2008). Seismic reflection imaging over the South Portuguese Zone fold-and-thrust belt, SW Iberia Journal of Geophysical Research, vol. 113, B08301. https://doi.org/10.1111/j.1365-246X.2008.03937.x
Schmelzbach, C., Juhlin, C., Carbonell, R., and Simancas, J.F. (2007). Prestack and poststack migration of crooked-line seismic reflection data: A case study from the South Portuguese Zone fold belt, southwestern Iberia. Geophysics, vol. 72 (2). https://doi.org/10.1190/1.2407267
Flecha, I., Carbonell, R., Zeyen, H., Martí, D., Palomeras, I.,Simancas, F., and Pérez-Estaún, A. (2006). Imaging granitic plutons along the IBERSEIS profile. Tectonophysics 420, 37-47. https://doi.org/10.1016/j.tecto.2006.01.019
Andara Oropeza, E. A. (2003). Visualización del subsuelo poco profundo a lo largo del perfil IBERSEIS : Reprocesado de datos de sismica de reflexión. Tesina. Universitat Politècnica de Catalunya
Flecha, I. (2003). Visualització sı́smica mitjançant tècniques tomogràfiques. PhD Thesis, Universitat de Barcelona, ICTJA-CSIC. 136 p.
Carbonell, R., Simancas, F., Juhlin, C., Ayarza, P., González, F., Pérez-Estaún, A., and Plata, J. (2002). Iberseis: A Deep Seismic Reflection Image of A Variscan Transpresive Orogen. EGS XXVII General Assembly, Nice, 21-26 April 2002, abstract #2724
Carbonell, R., Simancas, F., Juhlin, C., Ayarza, P., González, F., Pérez-Estaún, A., and Plata, J. (2001). IBERSEIS: a seismic reflection image of the Variscan orogen, SW Iberia. AGU Fall Meeting Abstracts. 82
Pérez-Estaún, A., Simancas, J. F., González Lodeiro, F., Ayarza, P., Azor, A., Juhlin, C., Sáez, R., Almodóvar, G. R., and Carbonell, R.; 2001; "Deep high resolution seismic reflection profile IBERSEIS NI: Migrated and stack files. [Dataset]"; DIGITAL.CSIC; http://dx.doi.org/10.20350/digitalCSIC/12643
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Files in This Item:
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Descripcion_ficheros_IBERSEIS NI_dataset.xlsxList of the files included in this dataset9,42 kBMicrosoft Excel XMLView/Open
Readme_IBERSEIS NI.txtDataset general information2,87 kBTextView/Open
Index card_IBERSEIS NI.pdfIndex card summarizing the main characteristics of the dataset1,05 MBAdobe PDFThumbnail
View/Open
IBERSEIS_SGY_raw.zipRaw seismic data36,42 GBSEGYView/Open
1-500.sgySGY files with the geometry information in the headers4,84 GBSEGYView/Open
501-1000.sgySGY files with the geometry information in the headers4,84 GBSEGYView/Open
1001-1500.sgySGY files with the geometry information in the headers4,83 GBSEGYView/Open
1501-2000.sgySGY files with the geometry information in the headers4,9 GBSEGYView/Open
2001-2500.sgySGY files with the geometry information in the headers5,33 GBSEGYView/Open
2501-3000.sgySGY files with the geometry information in the headers5,5 GBSEGYView/Open
3001-3500.sgySGY files with the geometry information in the headers5,47 GBSEGYView/Open
3501-4000.sgySGY files with the geometry information in the headers5,22 GBSEGYView/Open
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