Crustal structure of the continental margin of Korea in the East Sea (Japan Sea) from deep seismic sounding data: evidence for rifting affected by the hotter than normal mantle

Despite the various opening models of the southwestern part of the East Sea (Japan Sea) between the Korean Peninsula and the Japan Arc, the continental margin of the Korean Peninsula remains unknown in crustal structure. As a result, continental rifting and subsequent seafloor spreading processes to explain the opening of the East Sea have not been adequately addressed. We investigated crustal and sedimentary velocity structures across the Korean margin into the adjacent Ulleung Basin from multichannel seismic (MCS) reflection and ocean bottom seismometer (OBS) data. The Ulleung Basin shows crustal velocity structure typical of oceanic although its crustal thickness of about 10 km is greater than normal. The continental margin documents rapid transition from continental to oceanic crust, exhibiting a remarkable decrease in crustal thickness accompanied by shallowing of Moho over a distance of about 50 km. The crustal model of the margin is characterized by a high-velocity (up to 7.4 km/s) lower crustal (HVLC) layer that is thicker than 10 km under the slope base and pinches out seawards. The HVLC layer is interpreted as magmatic underplating emplaced during continental rifting in response to high upper mantle temperature. The acoustic basement of the slope base shows an igneous stratigraphy developed by massive volcanic eruption. These features suggest that the evolution of the Korean margin can be explained by the processes occurring at volcanic rifted margins. Global earthquake tomography supports our interpretation by defining the abnormally hot upper mantle across the Korean margin and in the Ulleung Basin.     

中强地震前山东地下流体地震前兆模糊分维特征研究

采用模糊集理论与分形理论相结合的模糊分维方法，计算山东地下流体在１９８３年菏泽５．９级地震和１９９５年苍山５．２级地震前的变化。分析结果认为，模糊分维值反映了地震前兆时序观测资料的结构变化特征，具有一定的物理意义，为从复杂的地下流体前兆观测值中提取地震异常信息提供了新的方法，但对某些台、测项而言、必须具体分析其模糊分维变化特征及其震前异常变化特征。     

1995年7月12日云南孟连中缅边界7.3级地震中短临预报及前兆异常特征（3）

研究了孟连７．３级地震前云南全省及震中距６００ｋｍ范围内跨断层短水准、短基线、地倾斜、水氡、水位、水汞等１３类观测项目，５５个台站，１１个台项测值的中、短、临异常情况。结果表明，震前中、短、临异常台项目分比为３８％，并主要集中在２００－４００ｋｍ范围。中期异常特征为异常时间长、幅度大、短临异常特征为中期异常趋势结束或测反向，部分项目出现“巨变”东家主震中附近异常出现晚而外围出现早、随着地震临近其异     

THE EFFECTS OF EXTERNAL FORCING,DISSIPATION AND NONLINEARITY ON THE SOLUTIONS OF ATMOSPHERIC EQUATIONS*

Based on the primitive equations of the atmosphere,we study the effects of external forcing.dissipation and nonlinearity on the solutions of stationary motion and non-stationary motion.The results show that the asymptotic behavior of solutions of the forced dissipative nonlinear system is essentially different from that of the adiabatic non-dissipative system,the adiabatic dissipative system,the diabatic non-dissipative system and the diabatic dissipative linear system,and that the joint action of external forcing,dissipation and nonlinearity is the source of multiple equilibria.From this we can conclude that the important actions of diabatic heating and dissipation must be considered in the models of the long-term weather and the climate.     

乳山金矿煌斑岩的Sm-Nd同位素研究

乳山金矿区发育多种与金矿脉在时空上密切伴生的煌斑岩脉。煌斑岩的稀土元素含量和配分曲线与胶东群残留体和昆嵛山花岗岩的均较相似；三者的εNd(t)、INd(t)和tDM亦甚为相近。胶东群的分异熔融作用，可较好地解释煌斑岩与花岗岩和胶东群残留体在成因上的渊源关系。     

地理信息系统空间分析方法及其若干应用

地理信息系统中的核心是空间属性数据库，而管理，分析和应用数据库中数据的空间分析功能和应用模型则是发挥数据库作用的关键部分。衡量一个地理信息系统的好坏，不仅决定于其数据库的数据质量，数据量和更新速度，关键要看其空间功能是否强大，实用具有灵活性。一般来讲，地理信息系统的空间分析有很强的综合性和专业性，也具有很大的灵活性。     

松潘—甘孜造山带中丹巴地区变质岩的流体包裹体研究

对丹巴地区动热变质岩石英中的流体包裹体研究表明，第一类型包裹体为高密度CO2包裹体，与深层滑脱作用密切相关，其温度、压力可代表变质峰期的温压条件。第二类型包裹体为CO2－H2O包裹体，H2O含量增加，与变质峰期后的抬升作用有关。第三类型包裹体为NaCl－H2O包裹体，以H2O为主，与抬升作用引起的退变质作用有关。其形成温度依次降低，说明它们是在变质作用的不同阶段捕获的。     

辽宁水泉金矿综合信息找矿模型及预测

通过对辽宁水泉金矿的基础地质研究和综合找矿信息分析，并根据该矿区资源危机，缺乏后备金矿储备的实际情况建立了水泉金矿综合信息找矿模型。对远景成矿靶区进行了初步圈定，为详细地质勘查、扩大金矿资源提供了依据。     

泥炭档案气候变化重建的定量模型

泥炭档案气候变化重建的定量模型＊陶发祥洪业汤（中国科学院地球化学研究所，贵阳５５０００２）李汉鼎冷雪天（东北师范大学地理系，长春１３００２４）关键词泥炭档案纤维素稳定同位素气候变化定量模型用泥炭档案定量重建大气ＣＯ２浓度的研究已取得重要进展［１］，但...     

1995年康定城区洪灾成因分析

分析洪灾成因 :长时间连续降雨和随后而至的暴雨 ,是山洪成灾主要因素 ;特殊的水系结构使洪峰流量在城区河流汇合处叠加 ;山洪的动能大 ,挟带泥沙和冲蚀能力强 ;泥石流、滑坡、崩塌强烈活动 ,为山洪提供大量泥沙、推移质 ;人类经济活动不当 ,加大了灾害损失