Spatio-temporal variations in the structure of the attenuation field of the S-wave in the region of Nevada nuclear test site

被引：0
作者：
Yu. F. Kopnichev
I. N. Sokolova
K. N. Sokolov
机构：
[1] Russian Academy of Sciences,Schmidt Institute of Physics of the Earth
[2] Republic of Kazakhstan,Institute of Geophysical Research, National Nuclear Center
[3] St. Petersburg State Technical University,undefined
来源：
Izvestiya, Physics of the Solid Earth | 2013年 / 49卷
关键词：
Lower Crust; Solid Earth; Epicentral Distance; Rift Zone; Earth Quake;
D O I：
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中图分类号：
学科分类号：
摘要：
The characteristics of the attenuation field of short-period shear waves in the region of Nevada nuclear test site (NNTS) are studied. The seismograms of underground nuclear explosions (UNEs) and earthquakes recorded by three seismic stations in 1975–2012 at the epicentral distances of up to 1000 km are processed by the methods based on the analysis of the amplitude ratios of Sn to Pn and Lg to Pg waves, as well as the S-coda envelopes for close events. It is shown that the structure of the attenuation field in the Earth’s crust and upper mantle in the NNTS region experienced significant temporal variations during the interval of nuclear operations. The strongest variations were associated with UNEs conducted in the Pahute Mesa area, which held about two-thirds of the most intense explosions. Our data indicate that temporal variations in the structure of the attenuation field are related to the migration of deep fluids. A comparison of the general characteristics of the attenuation field in the regions of the three large nuclear test sites is presented.
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页码：786 / 795
页数：9
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