Very Weak Signals (VWS) detected by stacking method according to different astronomical periodicities (HiCum)

Ruymbeke, M. Van; Zhu, Paikun; Cadicheanu, Nicoleta; Naslin, Sébastien

doi:10.5194/nhess-7-651-2007

Cited by 8 publications

(4 citation statements)

References 4 publications

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“…As further step, in order to evaluate which periods related to different natural phenomena match the occurrence of the VTs, we performed a statistical analysis on the seismic catalogues by applying the HiCum approach 22 combined with the Schuster test 23 (see Method section for details). This test assumes that earthquakes are time-independent events, therefore it could be biased by the presence of seismic swarms in the CLS + OTS catalogue.…”

Section: Resultsmentioning

confidence: 99%

“…HiCum (Histogram Cumulating) is an analysis method 22 to detect periodicity of a time series, by transforming and stacking time based observations into periodical based data. In particular, it is applied to investigate the correlation between the tidal potential components and earthquake occurrences 49 , 50 .…”

Section: Methodsmentioning

confidence: 99%

“…The correlation between the tidal components and earthquake occurence is investigated by using the Shuster test 22 , 51 . Each earthquake corresponds to a unit length vector in the direction of its tidal phase angle α i .…”

Section: Methodsmentioning

confidence: 99%

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Tidal and hydrological periodicities of seismicity reveal new risk scenarios at Campi Flegrei caldera

Petrosino

Cusano

Madonia

2018

Sci Rep

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The volcano-tectonic seismicity occurring at Campi Flegrei caldera during its present unrest phase, started in 2005, is distributed into time-clustered events emerging from a background composed of earthquakes with higher inter-arrival times. Here, we show that clustered seismicity is cyclically recurrent at time scales from semidiurnal to annual, matching tidal and hydrological periodicities. These results suggest that volcano-tectonic seismicity at Campi Flegrei caldera is driven by both variations in the deep magmatic feeding system and exogenous phenomena, as rainfall or global inflation/deflation cycles of the Earth’s crust, controlled by the lunisolar interaction. Consequently, the role of exogenous triggers in the evolution of the present unrest phase should be properly considered in the elaboration of volcanic risk scenarios, presently limited to the study of surface indicators of deep phenomena.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Tidal and hydrological periodicities of seismicity reveal new risk scenarios at Campi Flegrei caldera

Petrosino

Cusano

Madonia

2018

Sci Rep

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“…Many scientific papers are devoted to the problem of the role of the cosmic factors in the earthquakes occurring process (Harris, 2000;Lopes et al, 1990;Nikolaev, 1995;Nikolaev et al, 1996;Rydelek et al, 1992;Tanaka et al, 2006;Tanaka, 2007;Tsuruoka et al, 1995;Van Ruymbeke et al, 2007). In some cases there are shown the Sun perturbations and in other cases -the Moon perturbation components influence on the earthquakes occurring moments.…”

Section: Introductionmentioning

confidence: 99%

Connection of large earthquakes occurring moment with the movement of the Sun and the Moon and with the Earth crust tectonic stress character

Kachakhidze

Kiladze

Kachakhidze

et al. 2010

Nat. Hazards Earth Syst. Sci.

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Abstract. It is acceptable that earthquakes certain exogenous (cosmic) triggering factors may exist in every seismoactive (s/a) region and in Caucasus among them. They have to correct earthquake occurring moment or play the triggering role in case when the region is at the limit of the critical value of the geological medium of course.Our aim is to reveal some exogenous factors possible to initiate earthquakes, on example of Caucasus s/a region, taking into account that the region is very complex by the point of view of the tectonic stress distribution.The compression stress directed from North to South (and vice versa) and the spread stress directed from East to West (and vice versa) are the main stresses acted in Caucasus region. No doubt that action of the smallest external stress may "work" as earthquakes triggering factor.In the presented work the Moon and the Sun perturbations are revealed as initiative agents of earthquakes when the directions of corresponding exogenous forces coincide with the directions of the compression stress or the spreading tectonic stress in the region.

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Point Dilution Tracer Test to Assess Slow Groundwater Flow in an Auxiliary Karst System (Lake of Fontaine de Rivîre, Belgium)

Meus

Flament

Willems

et al. 2019

Advances in Karst Science

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The quantification of mass transfer through auxiliary karst systems is addressed by using a specific point dilution long-term tracer test. The physical functioning of such systems is usually only inferred by hydrodynamical and environmental tracer data, whose interpretation often relies on invalidated assumptions. The new approach is a way for experimentally validating or complementing the classical approaches. The lake of Fontaine de Rivîre is an auxiliary karst system in the Frasnian limestones of the Ourthe Valley in Belgium. Its particular confinement was studied by conjunctional use of natural responses and single-point dilution tracer test, with an injection of 41 g of uranine on 22 March 2017. The tracer test was monitored during one year using fluorometers, water and charcoal samplings at five points in the lake and six points at the surface (no connection having been established outside). A slow flow (in the order of magnitude of 1 m/h) of the lake could be observed and some mixing processes identified. The dilution of the tracer along the year indicates an average discharge of only 0.16 l/s. This low discharge is compatible with the high confinement of the lake also proved by its high homogeneity and stability (temperature and conductivity). However, the level fluctuations are apparently not compatible with this renewal, and especially with the low rate of dilution of the tracer observed during winter in the lake. This can thus be explained by pressure transfers from the surroundings, without necessarily high fluxes of water. The delays for the responses have also been quantified by cross-correlations for the whole period of monitoring from 2007 to 2018.

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Very Weak Signals (VWS) detected by stacking method according to different astronomical periodicities (HiCum)

Cited by 8 publications

References 4 publications

Tidal and hydrological periodicities of seismicity reveal new risk scenarios at Campi Flegrei caldera

Tidal and hydrological periodicities of seismicity reveal new risk scenarios at Campi Flegrei caldera

Connection of large earthquakes occurring moment with the movement of the Sun and the Moon and with the Earth crust tectonic stress character

Point Dilution Tracer Test to Assess Slow Groundwater Flow in an Auxiliary Karst System (Lake of Fontaine de Rivîre, Belgium)

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