Characterization of the shallow subsurface structure across the Carrascoy Fault System (SE Iberian Peninsula) using P-wave tomography and Multichannel Analysis of Surface Waves
Handoyo, Handoyo (Universitat de Barcelona. Departament de Dinàmica de la Terra i de l'Oceà)
DeFelipe, Irene (Universidad de Salamanca. Departamento de Geología)
Martín-Banda, Raquel (Consejo Superior de Investigaciones Científicas. Instituto Geológico y Minero de España)
García-Mayordomo, Julián (Consejo Superior de Investigaciones Científicas. Instituto Geológico y Minero de España)
Martí, David (Lithica SCCL)
Martínez-Díaz, José Jesús (Universidad Complutense de Madrid. Departamento de Geodinámica, Estratigrafía y Paleontología)
Insua-Arévalo, Juan Miguel (Universidad Complutense de Madrid. Departamento de Geodinámica, Estratigrafía y Paleontología)
Teixidó, Teresa (Universidad de Granada. Instituto Andaluz de Geofísica y Prevención de Desastres Sísmicos)
Alcalde, Juan (Consejo Superior de Investigaciones Científicas. Geosciences Barcelona)
Palomeras, Imma (Universidad de Salamanca. Departamento de Geología)
Carbonell, Ramon (Consejo Superior de Investigaciones Científicas. Geosciences Barcelona)

Data:	2022
Resum:	The seismicity in the SE Iberian Peninsula is distributed parallel to the coast in a well-developed strike-slip fracture system known as the Eastern Betic Shear Zone (EBSZ). This work focuses on the characterization of the shallow subsurface structure of the Algezares-Casas Nuevas Fault, within the Carrascoy Fault System of the EBSZ. The Carrascoy Fault borders the Guadalentín Depression to the south, which is a densely populated area with extensive agricultural activity. Therefore, this faults system represents a seismic hazard with significant social and economic implications. We have constructed two velocity-depth models based on P-wave tomography and Multichannel Analysis of Surface Waves (MASW) acquired from seismic reflection data. The resulting velocity models have allowed us to interpret the first ~250m depth and have revealed: i) the thickness of the critical zone; ii) the geometry of the Algezares-Casas Nuevas Fault; iii) the depth of the Messinian/Tortonian contact and iv) the presence of blind thrusts and damage zones under the Guadalentín Depression. Our results have also helped us to estimate an apparent vertical slip rate of 0. 66±0. 06m/ky for the Algezares-Casas Nuevas Fault since 209. 1±6. 2ka. Our results provide a methodological and backflow protocol to study the shallow subsurface of active faults, complementing previous geological models based on paleoseismological trenches, and can be used to improve the seismic hazard assessment of tectonically active regions around the world.
Ajuts:	Agencia Estatal de Investigación IJC2018-026335-I Agència de Gestió d'Ajuts Universitaris i de Recerca 2017SGR1022 European Commission. Horizon 2020 871121 European Commission. Horizon 2020 CGL2013-47412-C2-1-P Ministerio de Economía y Competitividad CGL2013-47412-C2-1-P
Nota:	Acknowledgement. The authors would like to acknowledge the project INTERGEO (CGL2013-47412-C2-1-P) GEO3BCNCSIC for the data access. Data are public access through SeisDARE (DeFelipe et al., 2021), dataset Martí et al.(2015). The Ministry of Education and Culture of the Republic of Indonesia is thanked for the main author's Ph.D. scholarship (D3.2/KD.02.01/2019). JA is funded by MICINN (IJC2018-026335-I). I.P. is funded by the Spanish Government and the Universidad de Salamanca (Beatriz Galindo grant BEGAL 18/00090). IDF is funded by a FEDER-Junta de Castilla y León Postdoctoral contract (SA0084P20). We thank the GIPP-GFZ, (Germany) and Lisbon University (Portugal) for the instrumentation provided. Generalitat de Catalunya (AGAUR) grant 2017SGR1022 (GREG); EU (H2020) 871121 (EPOSSP); and EIT-RawMaterias 17024 (SIT4ME). We sincerely thank Seismic Unix CWP (Center for the Wave Phenomena, Colorado School of Mines (Cohen and Stockwell, 2019)). We also thank all the people involved directly or indirectly in this work.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Algezares-casas nuevas fault ; Carrascoy fault ; Frontal strands fault ; MASW ; P-wave tomography
Publicat a:	Geologica acta, Vol. 20 (2022) , p. 1-19 (Articles) , ISSN 1696-5728

Adreça original: https://raco.cat/index.php/GeologicaActa/article/view/403886
Adreça alternativa: https://revistes.ub.edu/index.php/GEOACTA/article/view/37244
DOI: 10.1344/GeologicaActa2022.20.9

19 p, 9.2 MB

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