排序方式： 共有34条查询结果，搜索用时 0 毫秒
31.
P.I. Tokarev 《Journal of Geodynamics》1985,3(3-4)
During the large explosions of the Bezymianny (1956), Shiveluch (1964) and Mount St. Helens (1980) volcanoes, 4.8·1012, 3.0·1012 and 8.2·1012 kg of resurgent and magmatic material were ejected respectively. The eruptions were preceded and accompanied by significant crustal deformations and by a great number of volcanic earthquakes. In all three cases, earthquakes with an energy of E = 109 J occurred 8–11 days before the eruption; their foci were at a distance of less than 5 km from the floor of the active crater and the power of earthquake swarms increased continuously and monotonously until the beginning of the eruption. The data obtained on deformations, earthquakes and volcanic activity may be used for the prediction of the place, time, energy and hazards of large explosions of andesitic volcanoes. 相似文献
32.
Yu. K. Vasil’chuk E. P. Rets Ju. N. Chizhova I. V. Tokarev N. L. Frolova N. A. Budantseva M. B. Kireeva N. A. Loshakova 《Water Resources》2016,43(6):847-861
The formation of snowmelt runoff from the Dzhankuat glacier has been considered and the hydrograph of the Dzhankuat R. has been separated with the use of isotope and ionic balance. Isotope variations of runoff at the outlet section of the Dzhankuat R. have been studied for two ablation seasons of 2013 and 2014. The separation of 2014 hydrograph was based on δ18O and mineralization values obtained for various sources of Dzhankuat R. recharge: precipitation, snow of different seasons, firn, ice, and groundwater. The isotopic separation of the hydrograph has shown that, in June, a considerable portion (15–20%) of Dzhankuat R. total runoff is due to the melting snow cover that has formed during spring snowfalls. In June, the proportion of this component in the total daily runoff can reach 36%. The contribution of the runoff originating from winter-snow melting varies from 20% in the early to 50% in the late June. In August and September, the share of groundwater varies from 30 to 100%; the share of precipitation, from 0 to 30% (on the average for the period, 6%); and the share of water from melting firn and ice, from 0 to 70% (on the average, 38.6%). 相似文献
33.
Y. E. Terekhina M. Y. Tokarev N. V. Shevchenko N. A. Kozupitsa 《Moscow University Geology Bulletin》2017,72(3):209-214
The origin of the subsea uplifts of the Rugozerskaya bay and the Great Salma strait is discussed in this article. It was found that the present-day bottom surface of the investigation area imitates the post-glacial terrain. This was determined by accumulative glacial formations that were emulated with post-glacial sedimentation processes. All modern bottom uplifts are similar to the ancient post-glacial terrain. Most presentday bottom surface depressions are similar to post-glacial surface inequalities, but the configuration of modern closed kettles could be changed via glacial–marine sedimentation and other processes. 相似文献
34.
A. V. Gudkov I. L. Kamensky G. S. Melikhova V. I. Skiba I. V. Tokarev I. N. Tolstikhin 《Geochemistry International》2014,52(7):587-594
The measurement of 3H, 3He, 4He, and 20Ne concentrations in waters at the Tsentralny pumping station (southern Khibiny massif, Kola Peninsula) showed that they are a mixture of young (>90%) and old (<10%) waters. The excess noble gas component from the young water is caused by the dissolution of air bubbles trapped during recharge in the unsaturated zone. The 3H-3He(3H) age of the young water is 21 ± 1.5 yr. The U-Th-4He age of the old water is about 50 ka. The high concentrations of helium and some toxic elements (e.g., aluminum) in this old water are caused by dissolution of the alkaline rocks of the Khibiny massif as a result of water-rock interaction. 相似文献