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Start Over Author "Martín-González, Fidel" Topic induced seismicity
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2. Characterization of historical earthquakes through a study of landslides by lichenometry (Murcia, SE Iberia).

Author

Crespo-Martín, Cristina, Martínez Díaz, José Jesús, and Martín-González, Fidel

Subjects
ROCKFALL, LANDSLIDES, EARTHQUAKES, EARTHQUAKE magnitude, INDUCED seismicity, FAULT zones
Abstract

Earthquakes with magnitudes greater than 4.5–5 induce massive rockfalls close to the fault rupture zone. Driven by seismic shaking, the blocks collapse through the hillslope, which yields a fresh surface that is unbeatable for new lichen colonization. The lichenometric technique involves dating lichens developed on the surfaces of rockfall blocks induced by earthquakes. This study is focused on Cejo de Cano (Lorca, Spain), which is an earthquake-prone landslide scarp, as shown after the 2011 Lorca shaking (Mw 5.2). After this event, the possibility that the rocky volume at the foot of its slope could have a seismic origin started to be considered. In this research, lichenometry is used to date lichens on rock surfaces and test a possible correlation with the cataloged historical earthquakes. This research is important because of the large number of rockfall earthquakes found at this site by applying lichenometry compared to other studies in the literature. This technique allows us to extend the regional seismic catalog because the oldest lichens are older than the documented catalog of historical earthquakes. An oriented rockfall pattern that correlates with the location of epicenters is observed. In addition, the parallel and oblique previous fracturing of Cejo de Cano makes this scarp a suitable place to test whether the fracturing direction of the scarp could control a greater volume of rockfalls. This research opens up a new field of study to evaluate this correlation in larger areas. [ABSTRACT FROM AUTHOR]

Published
2024
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3. Sismicidad inducida en el yacimiento marino de gas Poseidón mediante el estudio de la sismicidad a largo plazo

Author

Pérez López, Raúl, Giner Robles, Jorge L., Canora Catalán, Carolina, Martín González, Fidel, Masana, Eulàlia, Pérez López, Raúl, Ortuño, María, Ministerio de Economía y Competitividad (España), and European Commission

Subjects
seismic energy, congreso, Gulf of Cadiz, yacimiento gas Poseidón, Poseidon gas field, Sismología, sismicidad inducida, Golfo de Cádiz, induced seismicity, energía sísmica
Abstract

Reunión Ibérica sobre Fallas Activas y Paleosismología (3ª. 2018. Alicante). - Texto en inglés con resumen y palabras claves en inglés y español, El yacimiento de gas de Poseidón constituye uno de los campos de extracción de gas el cual se localiza en el Golfo de Cádiz. Esta zona presenta fallas sismogénicas con capacidad de generar terremotos. Es por ello que un estudio exhaustivo de la potencial sismicidad inducida por operaciones de extracción de gas permitirá avanzar en el estudio de potenciales terremotos que afecten a la zona de Huelva, Cádiz y extremo suroeste de Portugal. La energía sísmica anual liberada en el entorno cercano al almacenamiento (50 km) presenta una correlación positiva con la cantidad de gas producida según datos oficiales del Ministerio de Energía, Turismo y Agenda Digital. También se observa que dicha correlación depende de la cantidad producida al año. Con estos datos, es importante hacer un seguimiento al ser una de las zonas de mayor actividad sísmica de la Península Ibérica, con capacidad de disparar terremotos destructivos. = The offshore field gas of Poseidon is located within the Gulf of Cadiz. This area is prone to large earthquakes, including the estimated epicentre of the great earthquake of Lisbon of 1755. In this sense, the study of the potential induced seismicity in this area is a key point to be addressed plus the role of induced earthquakes and large tectonic faults. We have found a positive correlation between the annual seismic energy released 50 km away of the gas field with the gas production (data provided by the Spanish Ministry of Energy).The long-term behaviour of the seismic energy and gas production indicates that induced seismicity was present during the period of extraction and reservoir depletion., Instituto Geológico y Minero de España, España, Departamento de Geología y Geoquímica, Universidad Autónoma de Madrid, España

Published
2018

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