Please use this identifier to cite or link to this item:

Title: Characterization of an Intraplate Seismogenic Zone Using Geophysical and Borehole Data: The Vila Franca de Xira Fault, Portugal
Authors: Carvalho, João
Alves, Daniela
Cabral, João
Ghose, Ranajit
Borges, J. F.
Dias, Ruben
Ramalho, Elsa
Caldeira, Bento
Casacão, João
Leote, Jaime
Issue Date: 2020
Publisher: Seismological Research Letters (SRL)
Citation: Carvalho, J.,D. Alves, J. Cabral, R. Ghose, J. Borges,R. Dias, E. Ramalho, B. Caldeira,J. Casacão, and J. Leote (2020).Characterization of an IntraplateSeismogenic Zone Using Geophysical andBorehole Data: The Vila Franca de XiraFault, Portugal,Seismol. Res. Lett.XX,1–11, doi:10.1785/0220190317
Abstract: The Vila Franca de Xira (VFX) fault is a regional fault zone located about 25 km northeastof Lisbon, affecting Neogene sediments. Recent shear-wave seismic studies show thatthis complex fault zone is buried beneath Holocene sediments and is deforming thealluvial cover, in agreement with a previous work that proposes the fault as the sourceof the 1531 Lower Tagus Valley earthquake. In this work, we corroborate these resultsusingS-wave,P-wave, geoelectric, ground-penetrating radar and borehole data, con-firming that the sediments deformed by several fault branches are of Upper Pleistoceneto Holocene. Accumulated fault vertical offsets of about 3 m are estimated from theintegrated interpretation of geophysical and borehole data, including 2D elastic seismicmodeling, with an estimated resolution of about 0.5 m. The deformations affecting theTagus alluvial sediments probably resulted from surface or near-surface rupture of theVFX fault during M∼7 earthquakes, reinforcing the fault as the seismogenic source ofregional historical events, as in 1531, and highlighting the need for preparedness for thenext event
Type: article
Appears in Collections:ICT - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

Files in This Item:

File Description SizeFormat
CARVALHO2020.pdf12.34 MBAdobe PDFView/Open
FacebookTwitterDeliciousLinkedInDiggGoogle BookmarksMySpaceOrkut
Formato BibTex mendeley Endnote Logotipo do DeGóis 

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.


Dspace Dspace
DSpace Software, version 1.6.2 Copyright © 2002-2008 MIT and Hewlett-Packard - Feedback
UEvora B-On Curriculum DeGois