Geophysical characterization of buried active faults: the Concud Fault (Iberian Chain, NE Spain)
Pueyo Anchuela, Óscar (Universidad de Zaragoza) ; Lafuente Tomás, Paloma ; Arlegui Crespo, Luis Eduardo (Universidad de Zaragoza) ; Liesa Carrera, Carlos Luis (Universidad de Zaragoza) ; Simón Gómez, José Luis (Universidad de Zaragoza)
Resumen: The Concud Fault is a ~14-km-long active fault that extends close to Teruel, a city with about 35,000 inhabitants in the Iberian Range (NE Spain). It shows evidence of recurrent activity during Late Pleistocene time, posing a significant seismic hazard in an area of moderate-to-low tectonic rates. A geophysical survey was carried out along the mapped trace of the southern branch of the Concud Fault to evaluate the geophysical signature from the fault and the location of paleoseismic trenches. The survey identified a lineation of inverse magnetic dipoles at residual and vertical magnetic gradient, a local increase in apparent conductivity, and interruptions of the underground sediment structure along GPR profiles. The origin of these anomalies
is due to lateral contrast between both fault blocks and the geophysical signature of Quaternary materials located above and directly south of the fault. The spatial distribution of anomalies was successfully used to locate suitable trench sites and to map non-exposed segments of the fault. The geophysical anomalies are related to the sedimentological characteristics and permeability differences of the deposits and to deformation related to fault activity. The results illustrate the usefulness of geophysics to detect and map non-exposed faults in areas of moderate-to-low tectonic activity where faults are often covered by recent pediments that obscure geological evidence of the most recent earthquakes. The results also highlight the importance of applying multiple geophysical techniques in defining the location of buried faults.
Idioma: Inglés
DOI: 10.1007/s00531-015-1283-y
Año: 2016
Publicado en: INTERNATIONAL JOURNAL OF EARTH SCIENCES 105, 8 (2016), 2221-2239.
ISSN: 1437-3254
Financiación: info:eu-repo/grantAgreement/ES/MINECO/CGL2009-13390
Financiación: info:eu-repo/grantAgreement/ES/MINECO/CGL2012-35662
Tipo y forma: Article (PostPrint)
Área (Departamento): Geodinámica Interna (Departamento de Ciencias de la Tierra)
All rights reserved by journal editor
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Exportado de SIDERAL (2016-12-15-10:28:59)
is due to lateral contrast between both fault blocks and the geophysical signature of Quaternary materials located above and directly south of the fault. The spatial distribution of anomalies was successfully used to locate suitable trench sites and to map non-exposed segments of the fault. The geophysical anomalies are related to the sedimentological characteristics and permeability differences of the deposits and to deformation related to fault activity. The results illustrate the usefulness of geophysics to detect and map non-exposed faults in areas of moderate-to-low tectonic activity where faults are often covered by recent pediments that obscure geological evidence of the most recent earthquakes. The results also highlight the importance of applying multiple geophysical techniques in defining the location of buried faults.
Idioma: Inglés
DOI: 10.1007/s00531-015-1283-y
Año: 2016
Publicado en: INTERNATIONAL JOURNAL OF EARTH SCIENCES 105, 8 (2016), 2221-2239.
ISSN: 1437-3254
Financiación: info:eu-repo/grantAgreement/ES/MINECO/CGL2009-13390
Financiación: info:eu-repo/grantAgreement/ES/MINECO/CGL2012-35662
Tipo y forma: Article (PostPrint)
Área (Departamento): Geodinámica Interna (Departamento de Ciencias de la Tierra)
All rights reserved by journal editor0
Exportado de SIDERAL (2016-12-15-10:28:59)
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