Weekend effect in seismic activity

Зотов, О. Д.

doi:10.1134/s1069351307120038

Cited by 20 publications

(5 citation statements)

References 4 publications

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“…Over the five weekdays, the apparent number of earthquakes shows an interesting symmetry. The magnitude of the Sunday maximum in the study area is similar to that found by Zotov (2007) in a global-scale study over the period of 1964-2003. To map the spatial distribution of the Sunday/weekdays difference, we calculate W, which is defined as…”

Section: Datasupporting

confidence: 84%

“…Relative to daily variations, studies of weekly variations of ASR are relatively rare. A recent global-scale study using the International Seismological Center (ISC) catalog for the whole Earth over the period of 1964-2003 revealed a weekly periodicity with the peak on Sundays (Zotov, 2007). Two hypotheses regarding the nature of the periodicity were proposed, namely an artifact caused by weekly variation of cultural noise and a real physical phenomenon caused by cultural-noise-induced variations in tectonic stress (Zotov, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Apparent Weekly and Daily Earthquake Periodicities in the Western United States

Atef

Liu

Gao

2009

Bulletin of the Seismological Society of America

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Analysis of apparent seismicity rate (ASR) using magnitude ≥ 1 earthquakes located in the western United States confirmed the existence of prominent spectral peaks with periods of 1 and 7 days. The number of recorded earthquakes on Sundays for the duration of 1963-2008 is about 5% higher than that on weekdays, and, more significantly, there is a 9% increase of ASR in the early morning compared with that in the middle of the days. Significant similarities in the spatial distributions of the weekly and daily variations suggest that the two types of variations have the same sources and both originate from periodic variations in cultural noise that lead to periodic variations in the detectability of the seismic networks. Comparisons with freeway traffic flow data suggest that traffic flow on the freeways is not the only significant factor in the observed periodicities. Instead, ambient noise from all the ground traffic, operating machineries, and building shaking is probably the major cause of the observed apparent periodicities. The observed temporal variations in ambient noise as reflected by the ASR can be used as objective guidelines for choosing the best time/day for noise-sensitive scientific experiments.

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Section: Datasupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Apparent Weekly and Daily Earthquake Periodicities in the Western United States

Atef

Liu

Gao

2009

Bulletin of the Seismological Society of America

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“…Figures 1, 2, 10, and 11 clearly demonstrate specific hidden periodicities in the industrial activity and, thus, shed light on the origin of the phenomenon of synchronism in the activity of the electromagnetic Pc1 emissions and the earthquakes. More examples can be found in (Guglielmi et al, 1978;2011;Fraser Smith, 1979;Samadani et al, 1981;Guglielmi and Zotov, 2007;2008;Zotov, 2007;Zotov and Guglielmi, 2010). It is instructive that global synchronism in the functioning of the technosphere was discovered in our work by studying the geophysical pro cesses in the magnetosphere and lithosphere.…”

Section: The Hidden Periodicities Associated With Explosionsmentioning

confidence: 93%

“…The WE effect was identified in (Zotov, 2007), and the HM effect in the global seismic activity was revealed in (Zotov and Guglielmi, 2010). Both results appear quite enigmatic.…”

Section: The Effects Of Synchronism In Seismic Activitymentioning

confidence: 97%

“…Lately, interest in this phenomenon has increased thanks to the successful application of the method of synchronous detection for analyzing huge volumes of digital data on the Pc1 pulsations in the magnetosphere (Guglielmi, 2007;Guglielmi and Zotov, 2007;2008;Zotov, 2010;Zotov and Guglielmi, 2010b;Guglielmi et al, 2011) and on earthquakes (Zotov, 2007;Dovbnya, Zotov, and Schepetnov, 2008;Zotov and Guglielmi, 2010a).…”

Section: Introductionmentioning

confidence: 95%

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The phenomenon of synchronism in the magnetosphere-technosphere-lithosphere dynamical system

Guglielmi

Зотов

2012

Izv., Phys. Solid Earth

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Synchronism in geophysical events became the focus of the research in the second half of the last century when the study of this subject was almost simultaneously launched in the former Soviet Union and the United States. Interest in this issue has recently risen after a 20 year hiatus. The impetus was provided by the successful application of the synchronous detection technique to analyzing vast volumes of digital data on the electromagnetic waves in the magnetosphere and on the earthquakes. These studies revealed signs of the strictly periodic synchronous influence of the technosphere on the regime of electromagnetic oscillations in cosmic plasma and on seismic activity. The phenomenon of synchronism between the electromagnetic and seismic events manifests itself in the form of the so called hour mark effect and the weekend effect. The hour mark effect shows itself in the 24th, 48th, and 96th harmonics, and the weekend effect, in the 7th subhar monic of the circadian rhythm. The both effects indicate that the technosphere has a nontrivial impact on the magnetosphere and lithosphere. The present review aims to introduce the morphology of the phenomenon and to focus the attention of researchers on the physical interpretation of the effects of synchronism, which is a challenging problem. Both the fundamental and practical value of the problem is analyzed. In particular, it is hypothesized that the study of the anthropogenic modulation of the natural wave processes will promote the development of energy saving technologies.

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The Spanish National Earthquake Catalogue: Evolution, precision and completeness

González

2016

J Seismol

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Weekend effect in seismic activity

Cited by 20 publications

References 4 publications

Apparent Weekly and Daily Earthquake Periodicities in the Western United States

Apparent Weekly and Daily Earthquake Periodicities in the Western United States

The phenomenon of synchronism in the magnetosphere-technosphere-lithosphere dynamical system

The Spanish National Earthquake Catalogue: Evolution, precision and completeness

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