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About the journal
NAUKA I TEKHNOLOGICHESKIE RAZRABOTKI (SCIENCE AND TECHNOLOGICAL
DEVELOPMENTS), ISSN: 2079-5165, eISSN: 2410-7948, DOI: 10.21455/std;
https://elibrary.ru/title_about.asp?id=32295; http://std.ifz.ru/. The journal was founded in 1992.
TEMPORAL VARIATIONS OF S-WAVE ATTENUATION FIELD
IN THE REGION OF LOP NOR NUCLEAR TEST SITE
Yu.F. Kopnichev1, I.N. Sokolova2
1 Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences, Moscow, Russia
2 Institute of Geophysical Research of the Ministry of Energy of the Republic of Kazakhstan, Almaty, Kazakhstan
Corresponding author: Yu.F. Kopnichev, e-mail: firstname.lastname@example.org
– Records of nuclear explosions and earthquakes by station BRVK were processed
– Methods of relative Sn level and P-coda slope analysis were used
– S wave attenuation in the lithosphere of the test site increased during 40 years
– Similar results were obtained for the regions of Semipalatinsk and Nevada test sites
– The effect is connected with fluid migration due to intense anthropogenic influence
Abstract. We studied characteristics of shear wave attenuation field in the region of Сhinese nuclear test site Lop Nor. We used methods, based on an analysis of relative level of Sn and Pn waves (parameter Sn/Pn), and also on a slope of P-coda envelopes. Sn wave is formed by shear waves reflected from multiple boundaries in the upper mantle, and P-coda is formed by conversion of S-P type in the lithosphere of the source region.
26 recordings of underground nuclear explosions (UNEs) and earthquakes, obtained by station BRVK at epicentral distances of ~1800–2000 km have been processed. It was established, that since the end of 1960s till the middle of 1990s at the recordings of the UNEs mean values Sn/Pn diminished essentially, and P-coda envelope slope increased in the area of test site. These effects testify to attenuation increasing in the lithosphere of the source region. Diminishing Sn/Pn parameter with time on the recordings of earthquakes in the region of test site was observed also after finishing the UNEs series. Similar results were obtained earlier for the regions of Semipalatinsk and Nevada nuclear test sites. We suppose that the effects revealed are caused by deep fluid migration as a result of long-term intense anthropogenic effect.
Keywords: Lop Nor test site, Sn wave, P-coda, S-wave attenuation, deep-seated fluids.
Cite this article as: Kopnichev Yu.F., Sokolova I.N. Temporal variations of S-wave attenuation field in the region of Lop Nor nuclear test site, Nauka i Tekhnologicheskie Razrabotki (Science and Technological Developments), 2018, vol. 97, no. 3, pp. 25–32. [in Russian]. DOI: 10.21455/std2018.3-3
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About the authors
KOPNICHEV Yuri Fedorovich – Doctor of Physical and Mathematical Sciences, major scientist, Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences. 123242, Moscow, ul. Bolshaya Gruzinskaya 10, stroenie 1. Tel.: +7(727) 295-63-50. E-mail: email@example.com
SOKOLOVA Inna Nikolayevna – Doctor of Physical and Mathematical Sciences, senior scientist, Institute of Geophysical Research of the Ministry of Energy of the Republic of Kazakhstan, 050020, Republic of Kazakhstan, Almaty, Chaikinoy 4. Tel.: +7(727) 263-13-30. E-mail: firstname.lastname@example.org