Excess Pore Pressure Evolution of the Marques de Pombal ContinentalSlope, Offshore Portugal

Excess Pore Pressure Evolution of the Marques de Pombal ContinentalSlope, Offshore Portugal

European Geosciences Union (EGU) General Assembly, 7-12 April 2019, Vienna, Austria.-- 1 page

Saved in:
Bibliographic Details
Main Authors: Mencaroni, Davide, Llopart, Jaume, Urgeles, Roger, Gràcia, Eulàlia
Format: comunicación de congreso biblioteca
Language:English
Published: European Geosciences Union 2019-04
Online Access:http://hdl.handle.net/10261/206910
Tags: Add Tag
No Tags, Be the first to tag this record!
id dig-icm-es-10261-206910
record_format koha
spelling dig-icm-es-10261-2069102020-09-02T15:55:12Z Excess Pore Pressure Evolution of the Marques de Pombal ContinentalSlope, Offshore Portugal Mencaroni, Davide Llopart, Jaume Urgeles, Roger Gràcia, Eulàlia European Geosciences Union (EGU) General Assembly, 7-12 April 2019, Vienna, Austria.-- 1 page The Marques de Pombal Mass Transport Complex (MTC) is located in the Alentejo Basin in the northern sector of the Gulf of Cadiz (SW Iberian Margin). Several geophysical studies and gravity core analyses over the last two decades reveal the contribution of multiple landslides and turbidity events in the formation of the MTC. The location of the MTC, at the base of the Marques de Pombal active fault, suggests fault activity as the most likely triggering mechanism for local mass wasting events. Moreover, the Marques de Pombal fault is considered by several authors as a possible candidate for the generation of the 1755 Great Lisbon catastrophic earthquake and tsunami event. The INSIGHT cruise conducted by ICM – CSIC in May 2018 collected new seismic, bathymetric and gravity core data from the study area, including undisturbed sediments at the top of the Marques de Pombal fault scarp. We performed consolidation tests to derive the evolution of porosity, permeability and compressibility of these sediments through time and at different burial conditions. The aim of this project is to evaluate the contribution of excess pore pressure (pre-conditioning factor) versus earthquake cyclic loading (trigger mechanism) in the Marques de Pombal area, to understand slope stability through time and make inferences about the magnitude of the seismic events that triggered the failures. We integrate into a finite element basin numerical model physical properties of the sediments collected during the INSIGHT cruise with a stratigraphic model of the basin derived from seismic profiles, swath bathymetry deep-towed side-scan sonar mosaics, and well and log data from the IODP 339 expedition. Starting from measured data, we obtained the computed excess pore pressure history for the sediments in the Marques de Pombal area. The results show how a significant lateral flow towards the Marques de Pombal fault scarp contributed to the generation of mid-to-high overpressures up to a value of 0.5, which started developing significantly in the Middle Pleistocene and continued during the Holocene. Since the timing of the overpressure development is in agreement with the occurrence of the Marques de Pombal MTC, we believe that excess pore pressure might have pre-conditioned the slope to fail Peer reviewed 2020-04-08T06:47:37Z 2020-04-08T06:47:37Z 2019-04 comunicación de congreso http://purl.org/coar/resource_type/c_5794 Geophysical Research Abstracts 21: EGU2019-9513 (2019) 1607-7962 http://hdl.handle.net/10261/206910 en Publisher's version https://meetingorganizer.copernicus.org/EGU2019/EGU2019-9513.pdf Sí open European Geosciences Union
institution ICM ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-icm-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del ICM España
language English
description European Geosciences Union (EGU) General Assembly, 7-12 April 2019, Vienna, Austria.-- 1 page
format comunicación de congreso
author Mencaroni, Davide
Llopart, Jaume
Urgeles, Roger
Gràcia, Eulàlia
spellingShingle Mencaroni, Davide
Llopart, Jaume
Urgeles, Roger
Gràcia, Eulàlia
Excess Pore Pressure Evolution of the Marques de Pombal ContinentalSlope, Offshore Portugal
author_facet Mencaroni, Davide
Llopart, Jaume
Urgeles, Roger
Gràcia, Eulàlia
author_sort Mencaroni, Davide
title Excess Pore Pressure Evolution of the Marques de Pombal ContinentalSlope, Offshore Portugal
title_short Excess Pore Pressure Evolution of the Marques de Pombal ContinentalSlope, Offshore Portugal
title_full Excess Pore Pressure Evolution of the Marques de Pombal ContinentalSlope, Offshore Portugal
title_fullStr Excess Pore Pressure Evolution of the Marques de Pombal ContinentalSlope, Offshore Portugal
title_full_unstemmed Excess Pore Pressure Evolution of the Marques de Pombal ContinentalSlope, Offshore Portugal
title_sort excess pore pressure evolution of the marques de pombal continentalslope, offshore portugal
publisher European Geosciences Union
publishDate 2019-04
url http://hdl.handle.net/10261/206910
work_keys_str_mv AT mencaronidavide excessporepressureevolutionofthemarquesdepombalcontinentalslopeoffshoreportugal
AT llopartjaume excessporepressureevolutionofthemarquesdepombalcontinentalslopeoffshoreportugal
AT urgelesroger excessporepressureevolutionofthemarquesdepombalcontinentalslopeoffshoreportugal
AT graciaeulalia excessporepressureevolutionofthemarquesdepombalcontinentalslopeoffshoreportugal
_version_ 1777667172529602560

Similar Items