Aquifer Sensitivity to Earthquakes: the 1755 Lisbon Earthquake

Sanz de Ojeda, Andrés and Alhama, Iván and Sanz Pérez, Eugenio (2019). Aquifer Sensitivity to Earthquakes: the 1755 Lisbon Earthquake. "Journal of Geophysical Research-Earth Surface", v. 124 (n. 8); pp. 8844-8866. ISSN 2169-9011. https://doi.org/10.1029/2019JB017753.

Description

Title: Aquifer Sensitivity to Earthquakes: the 1755 Lisbon Earthquake
Author/s:
  • Sanz de Ojeda, Andrés
  • Alhama, Iván
  • Sanz Pérez, Eugenio
Item Type: Article
Título de Revista/Publicación: Journal of Geophysical Research-Earth Surface
Date: 19 July 2019
ISSN: 2169-9011
Volume: 124
Subjects:
Faculty: E.T.S.I. Caminos, Canales y Puertos (UPM)
Department: Ingeniería y Morfología del Terreno
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The development of a theoretical analytical model leads us to consider the recession coefficient as a useful hydrological parameter for studying the hydraulic impacts of an earthquake on spring flow in terms of the increase of persistent discharges and the overall alteration of springs. Both the inertia of the aquifer emptying and the increased pore pressure in the lower part of the aquifer caused by the earthquake contribute to maintaining the discharge of persistent springs. Abundant information on the hydrological phenomena induced or modified by the 1755 Lisbon earthquake (M ∈ [8,9]) and its relationship with present‐day knowledge of the geology and hydrogeology of Portugal and Spain, as well as Spanish spring statistics, have allowed us to identify the factors that most influence the hydraulic sensitivity of aquifers to that earthquake: regional faults, geological boundaries between large geological units, the granite lithology, and aquifers with high recession coefficients. We observe an overall single response, which was an increase in postseismic spring discharges over the entire of the SW quadrant of the Iberian Peninsula (1–24 months). The persisting discharges were concentrated close to the major NE‐SW directional faults located in SW Portugal that are linked to the Azores‐Gibraltar strike‐slip fault. In terms of the geographical distribution of the hydrological phenomena, we observe that in the near and intermediate field of the earthquake source, there were persistent increases in spring flow in hard rocks occurring alongside persistent diffuse discharges, liquefaction, and rising water levels in wells due to consolidation of superficial geological formations.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainCTM2014‐54312‐PUnspecifiedUnspecifiedNew Models of Multiphase Flux in Porous Environments: Fundamental Processes and Application to Large Scale Problems in Hydrology

More information

Item ID: 63806
DC Identifier: http://oa.upm.es/63806/
OAI Identifier: oai:oa.upm.es:63806
DOI: 10.1029/2019JB017753
Official URL: https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2019JB017753
Deposited by: Memoria Investigacion
Deposited on: 16 Sep 2020 16:50
Last Modified: 16 Sep 2020 16:50
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