中国大气降水的氧同位素温标

中国北部中 高纬度地区大气降水δ1 8O与地面气温的相关性与中国其他地区不同 ,前者是正相关 ,后者是负相关。海口与香港的年均δ1 8O 温度系数为 - 0 .42‰ /℃ ,二者都属于热带季风型气候。高纬度地区年均δ1 8O 温度系数与月均系数相近 ,约为 0 .4‰ ℃ ,例如 ,兰州 0 .35‰ ℃ ,张掖 0 .46‰ ℃ ,乌鲁木齐 0 .42‰ ℃。中纬度地区石家庄月均δ1 8O 温度系数 (0 .11‰ ℃ )小于年均δ1 8O 温度系数 (0 .34‰ ℃ )。华北平原古大气降水δ1 8O 古地面气温系数为 0 .36‰ ℃ ,与石家庄现代大气降水年均δ1 8O 现代年均地面气温系数相近。因此 ,中国中高纬度地区大气降水的年均δ1 8O 温度系数 ,可用作氧同位素温标再造当地古气温。     

地震勘探方法在江西九江-瑞昌地区寻找隐伏岩(矿)体的应用及效果

提供了地震勘探方法在金属矿区寻找隐伏火成岩(矿)体的应用技术和地质成果。通过钻探工程验证,其结果与地震解释推断的结论有较好的吻合。这种尝试对拓宽地震勘探服务领域有重大意义。     

The Green''''s function of the harmonic horizontal force applied at the interior of the saturated half-space soil

IntroductionThe wave propagation problems in saturated soil are very important for the civil engineering, geophysics and seismology. Biot (1956,1962) established the theory of wave propagation in saturated soil firstly, and hereafter many researchers have used Biot theory to study wave propagation problems in saturated soil. By using integral transform and potential function method, Philippacopoulos (1988) studied the Lamb(s problem of a vertical point force applied to the surface of saturate…     

General characteristics of the recent horizontal crustal movement in Chinese mainland

1 Introduction of GPS observation dataThe Crustal Movement Observation Network of China (CMONOC) is a major scientific project in China organized by China Seismological Bureau and paticipated by the Bureau of Surveying and Mapping of the General Staff, the Chinese Academy of Sciences and the National Bureau of Surveying and Mapping. Based on the observation data of 25 fiducial stations and 56 basic stations in CMONOC (Figure 1 and Table 1), collected from August 26 to September…     

StudyofCurieisothermalsurfaceinSichuanBasinandtheseismicareaonitswesternmar┐gin

ＳｔｕｄｙｏｆＣｕｒｉｅｉｓｏｔｈｅｒｍａｌｓｕｒｆａｃｅｉｎＳｉｃｈｕａｎＢａｓｉｎａｎｄｔｈｅｓｅｉｓｍｉｃａｒｅａｏｎｉｔｓｗｅｓｔｅｒｎｍａｒ┐ｇｉｎＸＩＡＮＺＨＡＮＧ（张先），ＸＩ－ＦＥＮＧＨＵ（虎喜凤），ＪＩＮＧ－ＸＩＵＳＨＥＮ（沈京秀...     

广义Radon变换与叠前地震数据处理

在本文中,首先讨论了与几种地震层析成像对应的Radon变换公式,并导出了叠前地震记录的数学模型.在分析叠前地震记录与广义Radon变换的关系的基础上,讨论了速度分析、滤波、动校正、叠加等地震数据处理的数学物理意义.为展示广义Radon变换在地震数据处理中的应用,给出了用于滤波和消除多次波的方法及算例.     

柴达木盆地深部物理参数的反演

通过研究地球对表面载荷的响应来反演确定地球深部的物理参数.采用分为4层的地球模型,各层的介质被看作Maxwell粘弹性体.将柴达木盆地沉降发育过程中积累的沉积物作为随时间变化的载荷加于地表,通过拟合柴达木盆地沉降中心附近地区的沉降过程来研究该地区地壳的厚度及剪切模量、岩石层地幔的粘性及软流层的粘性等物理参数.计算结果表明,该地区地壳的剪切模量不会超过全球平均值的60％,岩石层地幔的粘性系数不大于1.5×10²³Pa·s.通过研究对该地区的深部物理参数得出了新的认识.     

TRANSPORT OF THE SUSPENDED SEDIMENT IN THE CHANGJIANG ESTUARY

The Changjiang River is characterized by the enormous volume of runoff and the great amount of sediment load with remarkable seasonal variation. The annual runoff sometimes is respondent to the amount of sediment load, and sometimes not. The amount of monthly sediment load after the month of the maximum runoff is larger than those before the month. The sediment concentration and net quantity of sediment transport in the vicinity of the river mouth varies greatly in time between the ebb and flood, spring and neap, and dry seasons and flood seasons. The three bifurcations also have differences in concentration and net quantity in space. Even in the same bifurcation they have differences in and out of the sand bar. At present, the North Channel is the main passage for water and sediment load emptying into the sea from the Changjiang River. More than 50 percent of the sediments from the river basin are deposited nearby the South Branch entrance and the main depositional area is situated in subaqueous delta off the South Channel. Between 122°30'E and 123°E is an important boundary for eastward sediment dispersion from which the suspended sediment are dispersed towards the east by south.     

安徽东至查册桥矿区金矿地质特征及找矿潜力分析

查册桥矿区位于江南过渡带，包括牛头高家金矿床、程檀金矿床、路源金矿点和东边金矿化点、杨梅尖金矿点.其中牛头高家金矿是安徽省首次发现的具一定规模的红土型金矿.研究区主体位于东至断裂与高坦断裂带交汇处及其两侧，三岗尖-杨美桥背斜核部及北翼.区内存在多个重要的赋矿层位，主要包括南华系休宁组、南沱组，震旦系蓝田组，寒武系黄柏岭组、杨柳岗组，奥陶系仑山组、东至组.高坦断裂带、兰程畈断裂带、奥陶系/志留系间的推覆-滑覆断层界面均是重要的控岩控矿构造，区内岩浆岩主要受其控制，物化探异常也主要沿其分布.通过对矿床地质特征总结，并结合前人研究成果，对找矿潜力进行分析，认为区内具有寻找低温热液型-叠改型、层控夕卡岩型、岩浆热液脉型金、铜、钨、钼、银、铅锌等矿化的潜力.     

2016年度呼图壁地下天然储气库对周缘微地震活动性的影响

呼图壁储气库是中国目前存储量最大的天然气储气库,位于新疆准噶尔盆地南缘,北天山山前坳陷带内的呼图壁背斜上.储气库靠近百万人口大城市乌鲁木齐,气库的注放气活动对其周缘地震活动的长期影响是事关生产和生活的重要安全问题.本文以呼图壁储气库为中心,在86.5°E—87.5°E,43.5°N—44.5°N的范围内,基于新疆维吾尔自治区地震局在该区域建立的密集流动台阵数据,应用模板匹配滤波技术对2016年全年的波形数据进行搜索识别,检测到遗漏地震事件151个,完善扩充了原有地震目录,使得该区域完备震级由1.1降到约0.7.通过分析新目录中404个地震的时空分布规律,我们发现2016年,即气库建成第三年以后,储气库的气压变化依然会影响周缘地区的地震活动.当储气库的气压增大到超过约22 MPa的阈值后,较小的气压波动也会导致该区域地震活动性明显增强;气压变化对距储气库中心最远约40 km范围内区域的地震活动存在较为明显的影响.