三峡水库地震孕震机理与未来地震趋势初探     

袁曲  董建辉 《地震地磁观测与研究》2005,(Z1)

以三峡库区区域地质构造、活动断裂及库区水文地质特点为基础,借鉴老一辈地震工作者对三峡地区地震地质活动的勘察与科研成果,阐述了蓄水后岩石的库水与地质相互作用对该区水文地质及构造的影响,浅释了三峡库区水库地震孕震机理;用三峡遥测台网及宜昌台定点地壳形变手段在蓄水前后的监测资料,对三峡宜昌库区水库诱发地震作了初步探讨及趋势分析。研究显示,库区地震活动的时空强频随着库区水体的变化而增强,并与活动断层空间分布呈一致性,具备水库地震的明显特征。预测认为:未来三峡宜昌库区的巴东-黔江与高桥断裂带、仙女山、九湾溪及天阳坪断裂交汇带,是诱发ML4.0～4.5水库地震的危险区。  相似文献   

论地质环境变化与地质灾害减轻战略   总被引：5，自引：1，他引：5  

刘传正 《地质通报》2005,24(7):597-602

地质灾害具备自然、社会和资源三重基本属性。地质灾害起源于地质环境变化。地质环境变化的动力是地外天体引力、地球内动力、地球表层外动力和人类社会工程经济活动4种地质作用。在区域社会经济建设高速发展阶段，人类与地质环境相互作用程度加重导致地质灾害造成的受灾人口和经济损失绝对量是持续上升的。通过采取各种减灾行动，可以实现因灾伤亡人数持续减少，灾害损失相对社会财富增长的比例持续降低，从而实现控制地质灾害增长的趋势。提出了国家地质灾害减轻战略目标、战略对策和减灾行动，强调建立政府、科学技术界、工程企业界与公众社会“四位一体”的减灾战略“伙伴”关系，推动减灾理念从被动防治向科学开发地质环境的转变。  相似文献   

Duration of migmatite formation in the granulite-facies metamorphism zone of Svecofennides of the Ladoga region, southeastern Baltic Shield     

Sh. K. Baltybaev  O. A. Levchenkov  Corresponding Member of the RAS V. A. Glebovitsky  L. K. Levskii  E. V. Kuz’mina  A. F. Makeev  S. Z. Yakovleva 《Doklady Earth Sciences》2006,407(1):271-274

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Geothermic estimates of the amplitudes of Holocene warming in Europe     

D. Yu. Demezhko  Corresponding Member of the RAS V. I. Utkin  A. D. Duchkov  D. G. Ryvkin 《Doklady Earth Sciences》2006,407(1):259-261

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Structure and age of the metamorphic core complex of the Burgutui ridge (southwestern Transbaikal region)   总被引：2，自引：0，他引：2  

A. M. Mazukabzov  T. V. Donskaya  D. P. Gladkochub  Corresponding Member of the RAS E. V. Sklyarov  V. A. Ponomarchuk  E. B. Sal’nikova 《Doklady Earth Sciences》2006,407(1):179-183

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Lunar monazites     

P. M. Kartashov  Academician of the RAS O. A. Bogatikov  A. V. Mokhov  A. I. Gorshkov  N. A. Ashikhmina  L. O. Magazina  E. V. Koporulina 《Doklady Earth Sciences》2006,407(2):498-502

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Liquefied vs stratified sediment mobilization processes: Insight from the South of the Barbados accretionary prism   总被引：3，自引：1，他引：3  

Eric Deville  Sophie-Hlne Guerlais  Yannick Callec  Roger Griboulard  Pascale Huyghe  Siegfried Lallemant  Alain Mascle  Mark Noble  Julien Schmitz  the collaboration of the Caramba working group 《Tectonophysics》2006,428(1-4):33-47

This paper discusses the nature and origin of subsurface sediment mobilization processes in deep marine clay-rich environments. In the studied area of the southern Barbados accretionary prism, new geophysical acquisitions have emphasized the spectacular widespread development of mud volcanoes that are well-developed along ramp anticlines and along sigmoidal rises with trends that are oblique to the axes of the main folds of the accretionary wedge. On some active mud volcanoes, heat-flow measurements show high positive anomalies related to high fluxes of mud transfer. The mobilized solid fraction expelled by the mud volcanoes does not originate from a unique source bed but from various formations pierced by the mud conduits and is driven by the water phase. The area studied also exhibits trends of structures corresponding to sub-circular massive local uplifts of deformed but well-preserved stratified sediments (turbidites and hemipelagics). No piercing shale diapirs have been encountered in this area. Some of these local uplift structures are complicated by the development of collapses, calderas, and superimposed mud volcanoes. Mud volcanism corresponds fundamentally to fluid displacement (water and gas), whereas massive sedimentary uplift corresponds to large vertical displacements of stratified solid levels but for which the deep cause could be partly the intrusion of mud plugs. Both are dynamic phenomena controlled by the development of overpressure at depth, contributing to sedimentary mobilizations.  相似文献   

Chemical mixing by turbulent convection in the overshooting region below the convective envelope of RGB stars     

Xiang-Jun Lai    Yan Li  National Astronomical Observatories /Yunnan Observatory  Chinese Academy of Sciences  Kunming  China  Key Laboratory for the Structure  Evolution of Celestial Objects  China Graduate University of Chinese Academy of Sciences  Beijing 《中国天文和天体物理学报》2011,(11)

Based on the turbulent convection model(TCM),we investigate chemical mixing in the bottom overshooting region of the convective envelope of intermediatemass stars,focusing on its influence on the formation and extension of blue loops in the Hertzsprung-Russell(HR) diagram.A diffusive mixing model is adopted during the Red Giant Branch(RGB) phase.The properties of the blue loop are changed by modification of the element profiles above the H-burning shell,which results from the incomplete mixing in the bottom...  相似文献   

Volatiles,vesicles, and vugs: Unraveling the magmatic and eruptive histories of Steno crater basalts     

Z. E. Wilbur  J. J. Barnes  S. A. Eckley  I. J. Ong  M. Brounce  C. A. Crow  T. Erickson  J. J. Kent  J. W. Boyce  J. L. Mosenfelder  T. Hahn Jr  F. M. McCubbin  T. J. Zega  the ANGSA Science Team 《Meteoritics & planetary science》2023,58(11):1600-1628

In 1972, Apollo 17 astronauts returned 170.4 kg of lunar material. Within 1 month of their return, a subset of those samples was specially curated with the forethought that future analytical techniques would offer new insight into the formation and evolution of the Moon. Of interest in this work is sample 71036, a basalt collected from the rim of Steno crater in the Taurus–Littrow Valley, which was stored frozen and was processed and released for study 50 years later. We report, for the first time, the detailed mineralogy and petrology of 71036 and its companion samples 71035, 71037, and 71055 using a novel combination of 2-D and 3-D methods. We investigate lunar volatiles through in situ measurements of apatite and 3-D measurements of vesicles to understand the degassing histories of the Steno crater basalts. Our coupled 2-D petrography and 3-D tomography data sets support a model of the Steno crater basalts crystallizing in the upper crust of a mare lava flow. Apatite F and OH chemistry and the late-stage deformation of voids and formation of smaller vesicles provide evidence supporting coeval degassing of volatiles and crystallization of mesostasis apatite in Apollo 17 basalts. This work helps to close knowledge gaps surrounding the origin, magmatic evolution, emplacement, and crystallization history of high-titanium basalts.  相似文献   

AsteroFLAG: First results from hare‐and‐hounds Exercise #1     

W.J. Chaplin  T. Appourchaux  T. Arentoft  J. Ballot  J. Christensen‐Dalsgaard  O.L. Creevey  Y. Elsworth  S.T. Fletcher  R.A. García  G. Houdek  S.J. Jimnez‐Reyes  H. Kjeldsen  R. New  C. Rgulo  D. Salabert  T. Sekii  S.G. Sousa  T. Toutain  the rest of the asteroFLAG group 《Astronomische Nachrichten》2008,329(5):549-557

We report on initial results from the first phase of Exercise #1 of the asteroFLAG hare and hounds. The asteroFLAG group is helping to prepare for the asteroseismology component of NASA's Kepler mission, and the first phase of Exercise #1 is concerned with testing extraction of estimates of the large and small frequency spacings of the low‐degree p modes from Kepler‐like artificial data. These seismic frequency spacings will provide key input for complementing the exoplanet search data. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)  相似文献