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地球物理学家、中国科学院地学部委员傅承义先生,1909年10月7日出生于福建省闽侯县。傅承义先生1933年毕业于清华大学物理系,留校任教七年,于1940年赴加拿大和美国留学,1941年获加拿大麦吉尔大学物理学硕士学位,1944年获美国加利福尼亚州理工大学地球物理学博士学位,1947年5月回国。解放后,傅承义先生一直在中国科学院地球物理研究所任研 相似文献
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古地震和断层滑动速率数据结合加州理工学院和美国地质调查局(CITUSGS0地震目录(1944-1992)用于检测沿南加州地区主要走滑断层的震级-频度分布的形态。对于纽波特-英格尔伍德断层、埃尔西诺断层、加洛克断层和圣安德烈斯断层,得到的分布是符合断层行为的特征地震模式的。沿圣哈辛托断层观测到的分布满足古登堡-里克特关系。如果仅注意圣哈辛托断层上由大的历史地震的破裂带或由断层线的清晰阶距标记的断层段 相似文献
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《ActaSeismologicaSinica》isinprogress──reporttothefourthsessionofacademicsymposlumofSSContheworkofASS(1992-1994)Xin-MeiLIUandY... 相似文献
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Reactive barriers are passive and in situ ground water treatment systems. Heterogeneities in hydraulic conductivity (K) within the aquifer-reactive barrier system will result in higher flux rates, and reduced residence times, through portions of the barrier. These spatial variations in residence time will affect the treatment capacity of the barrier. A numerical flow model was used to evaluate the effects of spatial variations in K on preferential flow through barriers. The simulations indicate that the impact of heterogeneities in K will be a function of their location and distribution; the more localized the high K zone, the greater the preferential flow. The geometry of the reactive barrier will also strongly influence flow distribution. Aquifer heterogeneities will produce greater preferential flow in thinner barriers compared to thicker barriers. If the barrier K is heterogeneous, greater preferential flow will occur in thicker barriers. The K of the barrier will affect the flow distribution; decreasing the K of the barrier can result in more even distribution of flow. Results indicate that less variable flow will be attained utilizing thicker, homogeneous barriers. The addition of homogeneous zones to thinner barriers will be effective at redistributing flow only if installed immediately adjacent to both the up- and downgradient faces of the barrier. 相似文献
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澳大利亚西部太古代浅层脉型金矿位于葡萄石-绿纤石岩相至低级绿片岩相岩石中,具有以下特征:(1)矿床主要赋存火山作用和构造活动期后形成的脆性剪切带中;(2)矿脉赋存于砾岩中;(3)含银硫盐、辉锑矿和早期的玉髓等低温矿石和脉矿物;(4)矿体内金属具有垂向分带性。 相似文献