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Investigation of acoustic signals correlated with the fow of muons of cosmic rays, in connection with seismic activity of the north Tien Shan

Mukashev K. M., Sadykov T. Kh., Ryabov V. A., Shepetov A. L., Khachikyan G. Ya., Salikhov N. M., Muradov A. D., Novolodskaya O. A., Zhukov· V. V., Argynova A. Kh.

Acta Geophysica

2019

Vol. 67, no. 4

1241--1251

The work is aimed at revealing a possible connection between seismic activity and cosmic-ray muon fuxes capable of penetrating into the Earth’s crust and generating a nuclear electromagnetic cascade in a tense seismically active medium, leading to the formation of microcracks, the opening of which is accompanied by the generation of acoustic and, under certain conditions, seismic energy as predicted by Tsarev and Chechin (Atmospheric muons and high-frequency seismic noise. In: Preprint of the FIAN, vol 179, 1988). The data of the underground installation (in a well at a depth of 52 m) for monitoring geoacoustic signals correlated in time with the fow of high-energy cosmic-ray muons generated in extensive atmospheric showers implemented on the basis of the experimental complex “ATHLET” in the Tien Shan High-Altitude Scientifc Station of the Physical Institute of the Russian Academy of Sciences were used. It is found that the daily number of acoustic pulses increases signifcantly before and during appreciable regional earthquakes. The most pronounced pulsed emissions of acoustic energy, correlated in time with the fow of high-energy cosmic-ray muons generated in extensive atmospheric showers, are followed by an increasing seismic activity in the region, that support idea that penetrating into Earth’s crust the fux of cosmic-ray muons may become a “trigger” of earthquake.

Trace fossils from Silurian and Devonian turbidites of the Chauvay area, southern Tien Shan, Kyrgyzstan

Warchoł M., Leszczyński S.

Annales Societatis Geologorum Poloniae

2009

Vol. 79, No 1

1-11

The siliciclastic turbidite successions (Pul’gon and Dzhidala Formations) that crop out in the eastern part of the Chauvay River valley, are marked on geological maps as a belt of terrigenous deposits of Silurian-Devonian age. They resemble deposits of overbank areas and depositional lobes of deep sea fans, and display common trace fossils particularly on lower surfaces of sandstone beds. Sixteen ichnotaxa representing four morphological groups have been distinguished. The trace fossil assemblages suggest their affiliation to the Nereites ichnofacies. Various branched, preturbidite forms predominate in both examined units, although the assemblages of individual units differ slightly in composition. In the Pulg’on Formation, small, densely distributed burrows commonly occur on lower surfaces of sandstone beds. Shallow burrowing depth together with relatively low diversity trace fossil assemblages indicate lowered oxygenation of the sea floor.