Structured flow-based gridding and upscaling for modeling subsurface flow   总被引：2，自引：0，他引：2  

C. He  L.J. Durlofsky 《Advances in water resources》2006,29(12):1876-1892

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东南沿海地区的断裂与地震   总被引：1，自引：0，他引：1  

卢帮华  黄日恒 《华南地震》2006,26(3):109-118

中国东部,相对来说东南沿海地区的地震活动较为频繁,断裂构造也十分发育。地震活动与断裂构造有非常密切的关系,震中与断裂构造的空间分布也关系密切。通过对东南沿海大量震例的调查和研究,分析三组断裂与地震的关系,得出东南沿海地区东西向、北东向和北西向的三组断裂构造,分别构成了区内的衰减构造、控震构造和发震构造,形成了东南沿海陆缘构造活动带。  相似文献   

2005年震情述评     

李纲  刘杰  余素荣 《中国地震》2006,22(1):107-115

据我国地震台网测定，2005年全球共发生7级以上地震16次（表1），最大地震为3月29日印尼苏门答腊岛西北海域8．5级地震（图1）。与2004年相比全球地震频次和能量释放均有所降低。2005年全球7级以上地震活动有以下特点。  相似文献   

The role of surface heterogeneity in modelling the stable boundary layer     

A. McCabe  A. R. Brown 《Boundary-Layer Meteorology》2007,122(3):517-534

High-resolution numerical simulations are performed for three nights for each of two areas of the United Kingdom. Area-averaging techniques are then used to calculate effective stability functions for turbulence parametrizations in models using typical mesoscale and global spatial resolutions. Comparisons are made with parametrizations commonly used in numerical weather prediction models. The present results do not suggest that significant enhancement of the stability functions above 50 m is justified. Closer to the surface, more significant enhancement is observed in some regions. It is shown that the amount of enhancement is related to the variability of the orography.  相似文献   

川青藏地区的地震活动及震源特征   总被引：4，自引：0，他引：4       下载免费PDF全文

高原  马林 《地震地质》1998,20(4):126-422

在分析区域地震活动和构造环境及利用ＧＤＳＮ的宽频带波形资料分析震源破裂特征的基础上,结合余震资料,讨论了１９８８～１９９０年发生在四川和青海的９次强震的震源破裂和余震分布特征,分析了四川、青海、西藏相邻区域内的地震能量迁移,并用单键群分析方法对１９７０年以来的地震活动总体图象进行了研究。结果表明,这些地震的震源性质与构造应力环境相符,但青海地震的震源都具有较大的逆掩分量,与过去的走滑震源性质不同,而四川地震的震源Ｐ轴不接近水平方向与当地的“Ｙ”字形复杂构造有关  相似文献   

香港地区活动断裂的初步探讨   总被引：1，自引：0，他引：1  

丁原章  黎权伟 《华南地震》1998,18(1):84-90

香港地区的断裂构造颇为发育,主要有北东、北东东和北西向三组断裂。在现今构造应力场作用之下,北东东和北西向断裂组成共轭断裂系统。由于本地区地震活动水平不高,尚难确定哪组断裂与地震活动密切相关。断层泥的热释光资料表明,断裂的最新活动应在晚更新世,断裂的复发周期应在１０万年左右。目前尚不能肯定哪条断裂为活动断裂。  相似文献   

1997年9月三水3.7和4.4级地震特征初析     

王正尚  康英 《华南地震》1998,18(1):125-129

对１９９７年９月２３日和２６日两次三水有感地震的特征进行了初步分析,认为这两次地震具有震前和震后地震活动水平低、面波发育和低震级高烈度等特性;震区的主压应力为北北西方向,两震的受力方向基本一致,但断层面解明显不同。  相似文献   

山西静乐井水位高值异常及其与华北地震活动的关系   总被引：1，自引：0，他引：1  

王爱英  张淑亮 《地震》1998,18(2):201-205

静乐井是山西省地下水观测网中的一口地震观测井。从１９８３￣１９９６年的１４ａ观测中,水位动态变化出现过３个高值时段,水位的高值虽有降雨渗入的影响,但主要可能是反映区域应力场加强的变化过程,因此３个水位高值时段与华北地区中强地震的活跃时期基本吻合。  相似文献   

A dense array experiment for the observation of waveform perturbations   总被引：1，自引：0，他引：1  

Stphane Gaffet  Christophe Larroque  Anne Deschamps  Florence Tressols 《Soil Dynamics and Earthquake Engineering》1998,17(7-8):475-484

We analyze observed three-component seismograms recorded by a dense array of 21 short-period receivers (f>2 Hz) installed on a homogeneous Quaternary plain with 1.5×3.5 km² horizontal dimensions. The experiment was conducted in the district of Caille, in SE France for 3 months. The observed waveform data are related to diffraction and refraction of the direct wavefield by different geological structures and topographic morphologies surrounding the array. The origin of the coda energy following the energetic Pg or Sg arrivals is either influenced by heterogeneities close to and inside of the valley, for instance thrust of Jurassic limestones over Cretaceous marls in the northern and southern limits of the valley, or by heterogeneities located outside of the valley such as the interface unconformity between crystalline basement and sedimentary cover in the northern border of the Maures–Tanneron ranges. The main energetic arrivals of the seismograms arrive at the array with a definite range of azimuths that is not correlated with the event back-azimuth. Moreover, these arrivals do not appear with azimuths related to the characteristic NS and EW valley orientations, and thus may be related to heterogeneities located outside of the valley.  相似文献   

Influence of astronomical factors on the dynamics of lithospheric plates     

A. I. Dmytrotsa  N. N. Gor’kaviy  L. S. Levitsky  T. A. Taydakova 《Bulletin of the Crimean Astrophysical Observatory》2007,103(1):82-88

We suggest the concept of the Earth’s lithosphere as a geocosmic system of mobile lithospheric plates affected by both external astronomical influences (solar radiation, tides) and planetary factors—the Earth’s atmosphere, hydrosphere, and mantle convection. The annual period in seismicity is shown to have a clear cosmic origin related to the seasonal periodicity of solar radiation in the northern and southern hemispheres. The atmosphere can act as a transmitter of the annual periodicity to the lithospheric plates. The formulated concept of the lithosphere has led us to put forward testable hypotheses about the dynamical atmospherelithosphere relationship. These hypotheses form the basis for the next program of research on the Earth’s lithosphere as a geocosmic system.  相似文献