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| Andres Sanz de Ojeda has analyzed numerous historical documents of the Lisbon earthquake of 1755, of a similar magnitude to that of Japan in 2011 or that of Chile in 2015 | Why can more water flow out of a spring after an earthquake? Is there a relationship between a rise in the water level of a well and a seismic movement? The answers to these and other questions are found in the conclusions of the doctoral thesis of the industrial engineer Andrés Sanz de Ojeda, defended this Monday at the Polytechnic University of Cartagena (UPCT) and rated with the highest score: outstanding Cum Laude.Sanz's scientific contribution is a novel method to predict and analyze how an aquifer and the springs associated with it behave, when a seismic event occurs even up to thousands of kilometers away.Sanz de Ojeda has analyzed the relationship between an earthquake and the affections in groundwater.
Groundwater behaves unevenly for different types of rock.
It depends on whether it is sedimentary, crystalline or plutonic in nature.The new doctor from the UPCT has used a mathematical model to establish this correlation from historical data that he has analyzed and the study of parameters such as the distance to the epicenter, the extent of the fault, the nature of the rock, the energy released by the earthquake and the physical and geometric hydraulic parameters, among other issues.Andrés Sanz has analyzed for almost three years historical data of the very strong Lisbon earthquake of 1755, of magnitude 8-9, which produced more than 2,400 deaths in the Iberian Peninsula and affected the Portuguese city, Cádiz and Huelva.
Among the files analyzed are those related to the tsunami that suffered the southwestern coast of the peninsula.
The intensity of this earthquake was similar to the one that struck Japan in 2011 and that of Chile in 2015.
The effects of a natural phenomenon were even appreciated in the province of Girona.Among the documents reviewed by Sanz are surveys that the Portuguese government conducted in the 18th century with questions of a scientific nature.
To review the sources, the new doctor has turned to the National Historical Archive and Royal Academy of History, to the Arquivo Ministério do Reino.
The latter collects questionnaires sent to all Portuguese parishes requesting information on the 1755 earthquake.The thesis has been supervised by professors Iván Alhama, from the area of ??Terrain Engineering at the UPCT, and Eugenio Sanz, from the Department of Civil Engineering at the Polytechnic University of Madrid.
Source: UPCT
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