Geodynamic processes in the <scp>NW</scp> Bohemian swarm earthquake region, <scp>C</scp>zech <scp>R</scp>epublic, identified by continuous gas monitoring

Weinlich, F. H.; Stejskal, Vladimír; Teschner, Manfred; Poggenburg, J.

doi:10.1111/gfl.12027

Cited by 22 publications

(40 citation statements)

References 69 publications

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“…(, ) and Weinlich et al . (, ). The monitoring was conducted from 2004 to 2009 at Oldřišská and from 2007 to 2010 at Nový Kostel.…”

Section: The Monitoring Systemmentioning

confidence: 99%

“…; Weinlich et al . , ), because Rn requires the CO 2 as a carrier gas owing to its very low partial pressure (Durrance & Gregory ; Ball et al . ; Etiope & Martinelli ; Yang et al .…”

Section: The Monitored Datamentioning

confidence: 99%

“…It is a continuation of gas monitoring data interpretation and methodology considerations given by Weinlich et al . ().…”

Section: Introductionmentioning

confidence: 97%

“…The gas monitoring time series data of the gas extracted from the scree at the Nový Kostel and Oldřišská monitoring stations located directly above the Plesná valley‐Počátky and Mariánské Lázně fault zones revealed a superimposition of different influences on the CO 2 concentration time series in the preceding period of relative seismic quiescence (Weinlich et al . , ). The long‐term seasonal trend of the CO 2 concentrations is governed by the groundwater temperatures, resulting in CO 2 concentration minima in March/April and a maximum in November at Oldřišská.…”

Section: Introductionmentioning

confidence: 99%

“…Additional stress interferes with this cycle as observed in both the CO 2 and Rn concentrations (Weinlich et al . , ). A complete absence of these diurnal variations in CO 2 and Rn concentrations were always linked with seismic events.…”

Section: Introductionmentioning

confidence: 99%

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The October 2008 Nový Kostel earthquake swarm and its gas geochemical precursor

et al. 2016

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A gas geochemical precursor anomaly was identified prior to the October 2008 Nový Kostel (Czech Republic) earthquake swarm with a peak magnitude ML of 3.8. This anomaly was observed as a deviation of CO2 concentrations from the long‐term annual CO2 concentration trend in the gas extracted from the scree at the Nový Kostel and Oldřišská gas monitoring stations, which are directly above the Plesná valley‐Počátky and Mariánské Lázně fault systems. Both sites are located within the major focal zone of the NW Bohemian swarm earthquake region at the northern edge of the Cheb Basin. A decrease in CO2 concentration started at Nový Kostel in September 2008, 17 days before the swarm, opposite to the usually increasing annual trend in the autumn period, and ended with a nearly coseismic drop immediately prior to the onset of the first swarm. The CO2 concentrations at Oldřišská, deviating from the annual trend, did not further increase after August 2008. The calculated horizontal strain field, based on the data of two permanent Global Navigation Satellite Systems stations, proved there was horizontal compression in this period. The increasing compression along the Plesná valley‐Počátky and Mariánské Lázně fault systems during the stress build‐up reduced the fault permeability prior to this earthquake swarm as indicated by the decrease in CO2 concentration. The 17‐day duration of the earthquake precursor at Nový Kostel and about 65 days at Oldřišská lie within the range of the precursor times that are hypothesized worldwide for an ML = 3.8 earthquake. The nature of earthquake precursors and their origin are discussed, for example, as an indication of changed fault permeability by stress build‐up in the case of the Nový Kostel swarm earthquake precursor or as fault opening in other cases.

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“…(, ) and Weinlich et al . (, ). The monitoring was conducted from 2004 to 2009 at Oldřišská and from 2007 to 2010 at Nový Kostel.…”

Section: The Monitoring Systemmentioning

confidence: 99%

“…; Weinlich et al . , ), because Rn requires the CO 2 as a carrier gas owing to its very low partial pressure (Durrance & Gregory ; Ball et al . ; Etiope & Martinelli ; Yang et al .…”

Section: The Monitored Datamentioning

confidence: 99%

“…It is a continuation of gas monitoring data interpretation and methodology considerations given by Weinlich et al . ().…”

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The October 2008 Nový Kostel earthquake swarm and its gas geochemical precursor

et al. 2016

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Temporal and spatial correlations between soil CO₂ flux and crustal stress

2016

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In seismically active areas, tectonic stress deforms and breaks the rocks of the crust. Ongoing deformation produces detectable modifications in the shallower portions of the crust, resulting in a wide variety of changes in several parameters. In this paper, we report the results of a large‐scale spatial (across an area of 15,000 km2) and temporal (up to 3 years) investigation of the relationship between active crustal stress and soil CO2 flux. We deployed a network of 10 automatic stations in most of the seismically active districts of southern Italy to monitor the soil CO2 fluxes, and we used seismicity data to track crustal stress. The results of the investigation show that the CO2 flux signals varied independently in the districts with low and sporadic seismicity. Conversely, in the only district with nearly continuous seismic activity, almost all of the CO2 flux signals were well correlated with each other, and we recorded a clear synchronous sharp increase of the seismicity and signals recorded by several stations. The high spatial and temporal correlation between seismicity and gas discharge evidenced in this study prove that the crustal stress associated with the seismogenic process is able to effectively modulate the gas release in a seismically active area.

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