新沂-泗县地震危险区地震活动和地震构造

运用深浅部构造对比研究、构造解析技术，结合历史地震资料、中强震观测资料分析、地震活动性分析结果，探讨中强震过渡区地震构造环境和地震韵律的研究途径，圈定出新沂—泗县地震危险区。对该危险区进行立体综合剖析，推演出未来中强震发生的空间部位，并预测了该区未来可能发生地震的震源深度、震级、地震长轴衰减方向、地震复发间隔等参数。     

Seismic activity in North Aegean region as middle-term precursor of Calabrian earthquakes

A comparative analysis of seismicity patterns in the Italian and Balkan regions (both related to the dynamics of the Adriatic Plate) has revealed a noticeable correlation between the time patterns of seismic energy release in the Calabrian Arc (southern Italy) and in the northernmost Aegean region. The systematic occurrence of damaging earthquakes in the Calabrian Arc within a few years after the most intense seismic periods in the North Aegean zone may be useful for middle-term earthquake prediction.     

Hydroclimatology of the North American Monsoon region in northwest Mexico

The North American Monsoon (NAM) system controls the warm season climate over much of southwestern North America. In this semi-arid environment, understanding the regional behavior of the hydroclimatology and its associated modes of variability is critically important to effectively predicting and managing perpetually stressed regional water resources. Equally as important is understanding the relationships through which warm season precipitation is converted into streamflow. This work explores the hydroclimatology of northwestern Mexico, i.e. the core region of the NAM, by (a) presenting a thorough review of recent hydroclimatic investigations from the region and (b) developing a detailed hydroclimatology of 15, unregulated, headwater basins along the Sierra Madre Occidental mountains in western Mexico. The present work is distinct from previous studies as it focuses on the intra-seasonal evolution of rainfall-runoff relationships, and contrasts the sub-regional behavior of the rainfall-runoff response. It is found that there is substantial sub-regional coherence in the hydrological response to monsoon precipitation. Three physically plausible regions emerge from a rotated Principal Components Analysis of streamflow and basin-averaged precipitation. Month-to-month streamflow persistence, rainfall-runoff correlation scores and runoff coefficient values demonstrate regional coherence and are generally consistent with what is currently known about sub-regional aspects of NAM precipitation character.     

Magnitudes of detectable and localizable shocks in nw bohemia

Summary The effectiveness of recording seismic phenomena in the Kruné hory (Mts.) region in NW Bohemia by selected stations in the CSR, GDR and Poland has been estimated. Magnitude isolines of the weakest earthquakes, which can be localized and detected with an 0.9 probability, were calculated on the basis of the level of seismic disturbances at the individual stations and of the empirical dependence of the attenuation of seismic waves with distance.

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多年冻土区桥梁的地震反应

首先研究了冻土区桥梁的抗震计算方法,对波动法和惯性力法的计算结果进行厂对比分析。对比结果表明惯性力法的计算结果偏大,但当基岩的剪切波速很大时,两种方法的结果接近。然后,采用波动法对季节性冻土区和多年冻土区桥梁结构进行了地震反应分析,研究了冻土层的变化对桥梁结构地震反应的影响,得到了不同冻土厚度、不同墩高时桥墩地震内力分布的规律。计算结果表明,冻土层的存在对桥梁的地震反应具有显著影响,桥墩的地震反应在冬夏两季具有显著区别。     

Seismic tomography in the Ostrava-Karviná mining region

The effective algorithm of seismic tomography was applied to the simultaneous determination of the velocity field in the medium and the location of hypocentres of events in the area of the underground seismological network in the Ostrava-Karviná mining region (OKR). Although the configuration of the network is unsuitable and the used data are relatively unreliable, after classifying the data it is possible to obtain representative information that demonstrates the existence of significant inhomogeneities of the medium in the area under study. In addition, it is possible to obtain more precise hypocentre parameters of local seismic events.     

宁夏地区上地幔地震各向异性特征

利用宁夏6个三分向宽频带数字地震台记录的震中距在85°—110°,震级大于6级的远震SKS波震相作了偏振分析,采用Silver-Chan方法求得了分裂参数,获得了宁夏地区上地幔各向异性图像.结果表明,宁夏地区上地幔各向异性普遍存在,本区盐池台(YCI)所在的鄂尔多斯块体下方的各向异性可归结为化石各向异性,其它地区的各向异性特征则反映了正在进行的构造运动,由此可为贺兰山脉东西两侧复杂的运动图像提供深部证据.最后推测本区的青藏高原东北缘—阿拉善块体及银川断陷区壳、幔的运动是耦合的,而鄂尔多斯块体地区壳、幔的运动型式尚不明朗.     

Human activity during the late Pleistocene in the Lop Nur region,northwest China: Evidence from a buried stone artifact

The Lop Nur region, in the east part of Tarim Basin, was an important transportation junction between west and east, north and south Eurasia. However, previous studies on prehistoric human activity have concentrated mostly on the Bronze Age, whereas that during the Stone Age remains largely unresearched. Here, we present a new direct evidence of human activity in the late Pleistocene, recorded on a grinding stone buried in a lacustrine sediment section of the Lop Nur region. The grain size distribution of the sediment section indicates that the site was probably in the center of a lake with weak hydrodynamic environment. Therefore, the stone artifact can only be carried to here by people instead of river and it was never move as soon as left here. Results of radiocarbon dating, the evident stratigraphic relations between the stone artifact and the sedimentary formation, indicate that the human activity could extend to approximately 13 ka BP. Furthermore, the results of starch-grain and use-wear analyses suggest that ancient humans gathered seeds of Triticeae, roots, and tubers and used the grinding stone to simply process selected plant as plant foodstuffs during this period. It implies that the environmental conditions in the river delta of the Lop Nur were inhabitable during the late Pleistocene.     

西北地区地震综合前兆信息量S值的应用研究

一个地震前兆观测异常所提供的地震信息一般由异常地点、异常变化量、异常持续时间以及异常完成后的延续有效时间等诸多因素所决定,因此提出了用于描述地震异常的前兆信息量S值。根据地震前兆异常信息量综合数学表达式为基础,充分结合平滑滤波、消周期及趋势项和从属函数等数据处理方法,对西北地区67个观测资料较为连续的前兆主要台项进行地震综合信息量S值的计算与提取。结果表明,S值综合信息量时序曲线在西北地区1986年5月至2005年3月间的10次MS≥5.0地震震前均出现不同程度的高值异常(S≥0.154)。     

黑龙江及邻近地区北西向断裂与滨州断裂地震活动特征分析

依据地震空间缺震、频度增强、b值和GL值扫描等结果,分析了黑龙江省及附近地区第5活跃期以来北西向断裂和滨州断裂地震活动特征,确定了未来地震的危险区。     

Seismic wave attenuation in the upper Mantle beneath the Aegean region

A detailed study of P and S waves from earthquakes located along the Hellenic arc and recorded by the Greek seismological network, shows an abnormal distribution of the seismic waves in the central Aegean Sea. The data indicate a zone of anomalously high seismic wave attenuation in the Upper Mantle beneath the Cyclades plateau and the inner part of the volcanic arc. Several independent observations suggest the presence of magma beneath the Cyclades massif.In addition, geophysical data indicate the presence of low-density and rigidity material. Theoretical consideration of the propagation of elastic waves corroborate the observed absence of shear waves.