共查询到20条相似文献，搜索用时 46 毫秒
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V. V. Shcherbakova G. V. Zhidkov V. P. Shcherbakov 《Izvestiya Physics of the Solid Earth》2008,44(10):816-821
A large volume of data on the paleointensity H an obtained by A.S. Bol’shakov and G.M. Solodovnikov is ignored in modern reconstructions because the authors did not indicate whether they used the check-point procedure for the detection of chemical alterations in rocks associated with determination of H an. The paper presents new values of H an determined by the Thellier-Coe method with the use of the checkpoint procedure from samples of the Armenian collection of Cretaceous rocks used in published studies of Bol’shakov and Solodovnikov. The new results are close to the published ones and point to a small value of the geomagnetic field in the Cretaceous, thereby corroborating Bol’shakov-Solodovnikov’s hypothesis on a low paleofield in the Mesozoic. Our study of samples of the collection studied confirms the reliability of Bol’shakov-Solodovnikov’s determinations of H an. 相似文献
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Izvestiya, Physics of the Solid Earth - 相似文献
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Kenji Satake Alexander Rabinovich Utku Kano?lu Stefano Tinti 《Pure and Applied Geophysics》2011,168(6-7):963-968
Eighteen papers are included in Volume 1 of a PAGEOPH topical issue Tsunamis in the World Ocean: Past, Present, and Future. These papers are briefly introduced. They are grouped into three categories: case studies of earthquake-generated tsunamis; tsunami forecast and hazard assessments; and theoretical and computational modeling of tsunami generation, propagation, and coastal behavior. Most of the papers were presented at the 24th International Tsunami Symposium held 14?C16 July 2009 in Novosibirsk, Russia, and reflect the current state of tsunami science. 相似文献
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Fifteen papers are included in Volume 2 of a PAGEOPH topical issue Tsunamis in the World Ocean: Past, Present, and Future. These papers are briefly introduced. They are grouped into three categories: reports and studies of recent tsunamis, studies
on tsunami statistics and application to tsunami warning, and modeling studies of tsunami runup and inundation. Most of the
papers were presented at the 24th International Tsunami Symposium held 14–16 July 2009 in Novosibirsk, Russia, and reflect
the current state of tsunami science. 相似文献
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Studia Geophysica et Geodaetica - 相似文献
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J. C. SCHÖNFELD 《水文科学杂志》2013,58(1):11-22
Abstract The intrusion of seawater in a tidal river is treated as a diffusion problem, characterized by a coefficient of longitudinal diffusivity. In order to analyse the longitudinal diffusivity, a mathematical model is set up, consisting of two bodies of water, either one besides the other or one on top of the other. The two bodies are assumed to move relatively to each other, as a secondary effect of the tidal flow. It is moreover assumed that there is turbulent exchange of salt between the bodies. It is demonstrated that the diffusion of salt into the river is greatest for an optimum value of the coefficient of exchange between the two bodies. Exchange weaker or stronger than this optimum both diminish the salt intrusion. The theory is applied to the Rotterdam Waterway, for which estimates of the exchange are made. Estimation of the reduction of the turbulence by stratification and hence of the vertical exchange, shows that the observed strong intrusion is explainable. Intensified vertical mixing, for instance as provoked by compressed air, need not always result in less intrusion, and hence should be considered carefully. 相似文献
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Disaggregation of the seismic hazard has become a popular technique to convey information on the main sources contributing
to the hazard at a particular site. Recently published work adopts geographic disaggregation analysis of seismic hazard as
a tool to identify dominant rupture scenarios for municipalities in Mainland Portugal. The authors conclude that the seismic
hazard in South and Central Portugal is dominated by the seismicity that takes place offshore, around 70km WSW of Cape S.
Vicente, both for the return periods of 475 years and 975 years. Whilst recognizing the merits of the approach taken and the
utility of the tools developed, we take issue with this last conclusion. We consider that the proposed disaggregation returns
a picture of the biases in the hazard analysis, more than any real feature of the distribution of relevant seismogenic sources. 相似文献
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S. A. Fedotov A. V. Solomatin S. D. Chernyshev 《Journal of Volcanology and Seismology》2012,6(2):65-88
We consider the results from the ongoing 2010–2011 work on long-term earthquake prediction for the Kuril-Kamchatka arc based
on the pattern of seismic gaps and the seismic cycle. We develop a forecast for the next 5 years, from September 2011 to August
2016, for all segments of the Kuril-Kamchatka arc earthquake-generating zone. For 20 segments we predict the appropriate phases
of the seismic cycle, the normalized rate of small earthquakes (A10), the magnitudes of moderate earthquakes to be expected with probability 0.8, 0.5, and 0.15, and the maximum possible magnitudes
and probability of occurrence for great (M ≥ 7.7) earthquakes. This study serves as another confirmation that it is entirely
necessary to continue the work in seismic retrofitting in the area of Petropavlovsk-Kamchatskii. 相似文献