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971.
Abstract: 3–D velocity images of the crust beneath the northern margin of the North China Plate have been constructed using P-wave travel time residuals of the latest earthquakes, with the data supplied by Chinese seismic networks.
The seismic image results indicate that there is a lateral heterogeneity in the crust beneath the northern part of the North China block. The velocity images of the upper crust show features closely related to the tectonic features on the surface. It can be seen from these velocity images of the vertical sections, and from the horizontal slice images at depths of 11 and 16 km that there exist East-West and North-East structures. The images indicate that the juncture zone of basin–and–range terrain is between the blue-colored high–velocity block corresponding to the Yanshan mountain range that developed during the Yanshan period in northwest Beijing and the green low-velocity area corresponding to the North China basin in southeast Beijing (Fig. 5). The juncture zone between high-velocity and low–velocity, and EW and NE fault zones have significant ore-control effects. From the chart of epicenters in the northern region of North China, we find that the epicenters of earthquakes are almost entirely distributed within the NE strip. Almost all major earthquakes took place in the transition strip between the high and low-velocity zones in the crust. The distribution of epicenters also reflects the strikes of known NE–faults. From the image sections along the latitude, we find that in the area between 114.0 E –118.0 E , there is a blue high-velocity block standing upright from the Moho to the upper crust (Fig. 6), from which can be deduced that some materials such as magma moved upward from the upper mantle during the history of its geological development. 相似文献
The seismic image results indicate that there is a lateral heterogeneity in the crust beneath the northern part of the North China block. The velocity images of the upper crust show features closely related to the tectonic features on the surface. It can be seen from these velocity images of the vertical sections, and from the horizontal slice images at depths of 11 and 16 km that there exist East-West and North-East structures. The images indicate that the juncture zone of basin–and–range terrain is between the blue-colored high–velocity block corresponding to the Yanshan mountain range that developed during the Yanshan period in northwest Beijing and the green low-velocity area corresponding to the North China basin in southeast Beijing (Fig. 5). The juncture zone between high-velocity and low–velocity, and EW and NE fault zones have significant ore-control effects. From the chart of epicenters in the northern region of North China, we find that the epicenters of earthquakes are almost entirely distributed within the NE strip. Almost all major earthquakes took place in the transition strip between the high and low-velocity zones in the crust. The distribution of epicenters also reflects the strikes of known NE–faults. From the image sections along the latitude, we find that in the area between 114.0 E –118.0 E , there is a blue high-velocity block standing upright from the Moho to the upper crust (Fig. 6), from which can be deduced that some materials such as magma moved upward from the upper mantle during the history of its geological development. 相似文献
972.
973.
974.
应用几何光学中的射线理论,直观地讨论了准定常波在时间平均基流中的传播,解释了定常 传播的纬向非均匀性。结果表明:折射指数平方可表示为基流绝对对基流流函数的微商,定常波的传播路径与折射指数平方的空间分布有着密切的关系。 相似文献
975.
年代际气候变率问题的研究 总被引:7,自引:3,他引:7
对年代际气候变率的研究工作和主要结果作了综合评述,并对该领域的研究前景作了一定的阐述。 相似文献
976.
一次三峡大暴雨的地转螺旋度分析 总被引:5,自引:4,他引:5
本文引入了地转螺旋度概念,并将其用于一次大暴雨的分析,结果发现;在地转螺旋度垂直剖面图上,在雨区上空300hPa附近有一个负的极小值中心,在500hPa有一个正的极大值中心,该分布形成原因可用图6解释。 相似文献
977.
978.
979.
980.
1995年,我国大部地区降水正常或偏多,但季节分配不均。春季,北方干旱范围较大,陕、甘等省冬春夏连旱,旱情严重。汛期,江南及东北南部暴雨频繁,赣、湘、辽、吉等省发展严重洪涝。全国大部地区热量比较充足,但光照条件欠佳,部分地区作物遭受低温寡照或霜冻危害。登陆台风和热带风暴偏多,两广局地损失严重。部分地区遭受风雹或沙尘暴袭击。 相似文献