Geochemical approach to provenance, weathering, hydrothermal processes and tectonics in a continental basin: The Ferreira basin (NW Spain)

González-Menéndez, L.; García, Augusto Rodríguez; Martín-González, Fidel; González-Álvarez, Ignacio; Gallastegui, G.; Suárez-Rodríguez, Ángela; Quintana, Leonard R.

doi:10.1016/j.catena.2021.105741

Cited by 3 publications

(2 citation statements)

References 40 publications

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“…This assumption is supported in the significant increase of earthquake geochemical precursors in this CO2rich groundwater before the 1995 and 1997 seismicity. B.-The interaction of hydrothermal deep fluids along active faults in this region (González-Menéndez et al 2022), which caused element mobility by advection in the fault damage zone proximity. These studies show that the faults are permeable channels to deep fluids, and that these hydrothermal fluids percolated producing higher alteration and elements anomalies in the fault surrounding.…”

Section: Discussionmentioning

confidence: 99%

Testing potential trigger mechanisms for seismicity in Sarria-Triacastela-Becerreá (Lugo seismic sequences) NW Iberian Peninsula, Spain

Crespo-Martín

Martín-González²,

Hainzl³

et al. 2022

J Seismol

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The unprecedented and long-lasting seismicity of Triacastela (over 25 years) attracted the interest of the research community on this stable continental region (SCR), particularly after the anomalously high 5.1 and 4.9 Mw earthquakes compared to the regional standards. The high rainfall and tide rates of this region compared to the rest of the Iberian Peninsula, in addition to the recognized existence of thermal springs and crustal fluids, motivated us to test these sources of hydroseismicity as a potential trigger mechanism for the observed seismicity in Triacastela. Based on network upgrades, we have gathered the seismic catalog in two periods for analysis (before and after year 2002). Before 2002, neither a diffusion-type earthquake migration nor any significant statistical correlation between the seismicity rates and rainfall or tides is found. After 2002, some clusters migrate to the south, suggesting the presence of fluid migration during earthquake swarms, but no diffusion-type migration is observed on longer time scales. Furthermore, we find correlation coefficients close to zero, indicating that rainfall and tides can be excluded as driving mechanisms. However, the seismic upward migration, a high b-value (1.2), and a low aftershock-productivity parameter (α=0.9) observed in this period support the hypothesis of upward fluid migration through fracture zones. The presence of Mantellic helium-3 along the seismogenic faults and the increase of geochemical precursors in the groundwater previously to 1995 and 1997 mainshocks further support deep fluids as a source for the observed induced fluid migration seismicity in Triacastela. Article Highlights:• Swarms, upward migration, high b-value, and low α-value after 2002 suggest a fluid influence on Triacastela seismicity.• Pearson correlations close to zero reject rainfall and tides as driving mechanisms of Triacastela seismicity.• The mantellic helium-3 in groundwaters, the geochemical precursors rise and elements mobility over faults evoke deep fluids migration.

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Section: Discussionmentioning

confidence: 99%

Testing potential trigger mechanisms for seismicity in Sarria-Triacastela-Becerreá (Lugo seismic sequences) NW Iberian Peninsula, Spain

Crespo-Martín

Martín-González²,

Hainzl³

et al. 2022

J Seismol

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“…Presentan actividad cuaternaria y alteración geoquímica reciente relacionada con las fallas (p. ej. en la falla Ferreira, González-Menéndez et al, 2022).…”

Section: Sistemas De Fallas De Desgarre Dextral No-se Y Ono-eseunclassified

Iberfault 2022. IV Reunión Ibérica sobre Fallas Activas y Paleosismología. Volumen de resúmenes, Teruel, 7 al 10 de septiembre de 2022 ; 1ª ed.

2022

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SESIÓN 1: Tectónica activa y paleosismología de las Cordilleras Béticas (I) SESIÓN 2: Tectónica activa y paleosismología del resto de la Península Ibérica SESIÓN 3: Sismología y sismicidad inducida SESIÓN 4: Arqueosismología SESIÓN 5: Tectónica activa y paleosismología de las Cordilleras Béticas (II) SESIÓN 6: Tectónica activa en el medio marino SESIÓN 7: Geodesia aplicada a tectónica activa SESIÓN 8: Modelización sismotectónica

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Understanding seismicity and seismotectonics in a stable continental region (NW Iberian Peninsula): Implications for the nature of intraplate seismicity

Martín-González

Crespo-Martín

Cesca

et al. 2023

Global and Planetary Change

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Geochemical approach to provenance, weathering, hydrothermal processes and tectonics in a continental basin: The Ferreira basin (NW Spain)

Cited by 3 publications

References 40 publications

Testing potential trigger mechanisms for seismicity in Sarria-Triacastela-Becerreá (Lugo seismic sequences) NW Iberian Peninsula, Spain

Testing potential trigger mechanisms for seismicity in Sarria-Triacastela-Becerreá (Lugo seismic sequences) NW Iberian Peninsula, Spain

Iberfault 2022. IV Reunión Ibérica sobre Fallas Activas y Paleosismología. Volumen de resúmenes, Teruel, 7 al 10 de septiembre de 2022 ; 1ª ed.

Understanding seismicity and seismotectonics in a stable continental region (NW Iberian Peninsula): Implications for the nature of intraplate seismicity

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