A geophysical study of the S. Marcos–Quarteira fault, Portugal

Carvalho, João P. G.; Torres, Luis Miguel Martínez; Rocha, R.; Dias, Ruben P.; Mendes-Victor, L.

doi:10.1016/j.jappgeo.2006.02.002

Cited by 14 publications

(5 citation statements)

References 21 publications

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“…According to evidence from geological mapping, wells and a regional profile based on vertical electrical sounding (VES) (GEIRNAERT et al, 1982), such a thick column of sediments corresponds to Pliocene-Pleistocene sediments (the Ludo Formation) that have been affected by faults. This seismic pattern is also similar to the one observed in a seismic profile previously acquired over the Ludo Formation (CARVALHO et al, 2006). The next seismic sequence is composed of reflectors that present a good continuity and weak to moderate amplitude.…”

Section: Reflection Datasupporting

confidence: 84%

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A Geophysical Study of the Carcavai Fault Zone, Portugal

Carvalho

Ramalho

Dias

et al. 2011

Pure Appl. Geophys.

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The Algarve province is located a few hundred kilometres north of the crossing of the E-W Eurasia-Africa plate boundary in an area of diffuse seismicity and broad deformation. It is characterised by a moderate seismicity, with some important historical and instrumental earthquakes causing loss of lives and significant material damages. The area is affected not only by plate boundary earthquakes but also by moderate to large events generated by local sources. The assessment of onshore local sources is, therefore, of vital importance for an evaluation of the regional seismic hazard. This paper discusses the application of geophysical data to the study of the Carcavai fault zone, an outcropping structure more than 20 km long which is seen to deform sediments of the Plio-Quaternary age. The location of some sectors of the fault zone, as well as the vertical offsets of the structure, are still to be confirmed. In order to estimate these and to study the geometry of the fault zone at depth, geophysical data were acquired together with new geological data. Where the location of the fault was less certain, EM and seismic reflection profiles with coarse spatial sampling were carried out. After the detailed location of the fault zone, seismic reflection profiles with a more dense spatial resolution were acquired. The integrated interpretation of the geological and geophysical data confirmed the presence of a large fault zone. The total fault length is still unknown as its extension offshore is still being studied. Together with estimated values of the throw obtained, this data set has improved understanding the seismic hazard in the area by providing more refined estimates of coseismic rupture, maximum expected earthquake and return periods.

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Section: Reflection Datasupporting

confidence: 84%

“…To determine the timing of faulting we carried out a seismostratigraphic analysis based on previous seismic reflection work in the area (CARVALHO et al, 2006), available wells for water supply, geological outcrop information and the principles of sequence analysis.…”

Section: Reflection Datamentioning

confidence: 99%

A Geophysical Study of the Carcavai Fault Zone, Portugal

Carvalho

Ramalho

Dias

et al. 2011

Pure Appl. Geophys.

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“…Their crosssection presented a sub-tabular PQ above MIO and CRET formations, diving towards the south. The marly CRET was also identified by other authors in the Quarteira region, below the MIO (Carvalho et al 2006(Carvalho et al , 2012Geirnaert et al 1982).…”

Section: Geoelectrical Modelsupporting

confidence: 73%

Contributions of hydrogeophysics to the hydrogeological conceptual model of the Albufeira-Ribeira de Quarteira coastal aquifer in Algarve, Portugal

et al. 2015

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Geoelectrical and electromagnetic (time and frequency domains) hydrogeophysical methods were applied and jointly interpreted together with auxiliary information such as regional piezometric maps, borehole lithological logs and offshore data. The objective was to retrieve the structure and geometry of the AlbufeiraRibeira de Quarteira coastal aquifer system (Algarve, Portugal) and to upgrade the current hydrogeological conceptual model. The results allowed for the detection of the freshwater-saltwater interface along the coastline and identification of the water-bearing layers and aquitards and their hydraulic relationships. An explanation for the location of the inter-and subtidal fresh groundwater discharge is also presented and a new modeling unit is proposed for groundwater flow modeling. Limitations of the used hydrogeophysical methods are indicated and recommendations are made for follow-up studies.

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“…Their cross-section presents a sub-tabular PQ above MIO and CRET formations, diving towards south. The marly CRET was also identified by other authors in the Quarteira region, below the MIO (Geirnaert et al, 1982;Carvalho et al, 2006Carvalho et al, , 2012.…”

Section: Geoelectrical Modelsupporting

confidence: 70%

Integration of hydrogeophysics and remote sensing with coupled hydrological models

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A geophysical study of the S. Marcos–Quarteira fault, Portugal

Cited by 14 publications

References 21 publications

A Geophysical Study of the Carcavai Fault Zone, Portugal

A Geophysical Study of the Carcavai Fault Zone, Portugal

Contributions of hydrogeophysics to the hydrogeological conceptual model of the Albufeira-Ribeira de Quarteira coastal aquifer in Algarve, Portugal

Integration of hydrogeophysics and remote sensing with coupled hydrological models

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