A Study on the Relationship Between Sequential Anomalies of Water Level Step-Variations in the Wanquan Well and Earthquakes

This paper studies the relationship between water level step-variation anomalies and regional seismic activity.The train of thinking is as follows:First,a series of water level step-variation anomalies are regarded as sequential step-variation anomalies; next,these sequential anomalies are divided into several sub-sequential anomalies according to the temporal density of step-variations in different segments of the sequence; then the generation and evolution processes of various sub-sequential anomalies are analyzed to find their relation with regional moderate-strong earthquake activities,and finally the various sub-sequential anomalies are synthesized as sequential anomalies so as to analyze their relation with the tendency of seismic activities.By the above method,this paper has analyzed the relationship between a series of water level step-variation anomalies at the Wanquan well since 1981 and several regional moderate-strong earthquake activities.According to the monthly frequency,amplitude and tre     

A preliminary study of the effects of some flow parameters in the generation of poloidal and toroidal energies within a 3-D spherical thermal-convective system with variable viscosity

The effects of variable viscosity on flow dynamics within spherical shells are investigated using a finite-element thermal convection model, and preliminary result for cases with relatively low Rayleigh numbers and small viscosity contrasts are reported. These results demonstrate some general effects of viscosity variation on mantle dynamics, and, in particular, the generation of toroidal energy. Since lateral viscosity variations are necessary in the generation of toroidal motion in a thermally driven convective system, it is not surprising our results show that flows with greater viscosity contrasts produce greater amounts of toroidal energy. Our preliminary study further shows that solutions become more time-dependent as viscosity contrasts increase. Increasing the Rayleigh number is also found to increase the magnitude of toroidal energy. Internal heating, on the other hand, appears to lead to less toroidal energy compared wth bottom heating because it tends to produce a thermally more uniform interior and thus smaller viscosity variations.     

Electromagnetic radiation anomalies before moderate and strong earthquakes

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房山花岗闪长岩体长石斑晶的数学特征及相带划分

对北京房山花岗闪长岩体中长石斑晶进行了系统测量,测点密度平均4.37个/km~2,测量标志为长石斑晶长轴长度和长石斑晶线含量等。对测得数据进行了分布统计、有序样品最优分割、和趋势变化分析等处理。揭示了长石斑晶在岩体中的分布规律和数学特征,划分了趋势岩相带,从而提出了较为合理的岩相带划分原则。     

泥潭冲金矿床中毒砂标型特征及金的赋存状态

泥潭冲金矿床为主要受近EW向脆-韧性剪切带控制的砷金矿床,是龙王江锑砷金成矿区最具代表性和经济意义的金矿床.文章阐述了矿床地质特征,探讨了载金矿物毒砂的标型特征和金的赋存状态,认为毒砂中的"不可见金"主要为纳米级微粒状的自然金.     

河南西峡-内乡琥珀矿床的初步研究

河南西峡-内乡琥珀矿床是我国琥珀市场上原料的重要产地。通过对该矿床的地层、岩相、古地理以及水动力条件等因素的分析研究，以及对琥珀矿体地质特征、琥珀物理性质及化学组成特征的研究，认为该琥珀矿床属于晚白垩世河流冲、洪积沉积矿床。     

Inference of mantle viscosity from GRACE and relative sea level data

Gravity Recovery And Climate Experiment (GRACE) satellite observations of secular changes in gravity near Hudson Bay, and geological measurements of relative sea level (RSL) changes over the last 10 000 yr in the same region, are used in a Monte Carlo inversion to infer-mantle viscosity structure. The GRACE secular change in gravity shows a significant positive anomaly over a broad region (>3000 km) near Hudson Bay with a maximum of ∼2.5 μGal yr⁻¹ slightly west of Hudson Bay. The pattern of this anomaly is remarkably consistent with that predicted for postglacial rebound using the ICE-5G deglaciation history, strongly suggesting a postglacial rebound origin for the gravity change. We find that the GRACE and RSL data are insensitive to mantle viscosity below 1800 km depth, a conclusion similar to that from previous studies that used only RSL data. For a mantle with homogeneous viscosity, the GRACE and RSL data require a viscosity between  1.4 × 10²¹  and  2.3 × 10²¹  Pa s. An inversion for two mantle viscosity layers separated at a depth of 670 km, shows an ensemble of viscosity structures compatible with the data. While the lowest misfit occurs for upper- and lower-mantle viscosities of  5.3 × 10²⁰  and  2.3 × 10²¹  Pa s, respectively, a weaker upper mantle may be compensated by a stronger lower mantle, such that there exist other models that also provide a reasonable fit to the data. We find that the GRACE and RSL data used in this study cannot resolve more than two layers in the upper 1800 km of the mantle.     

水泥—丙烯酸盐复合浆液的实验性研究

水泥-丙烯酸盐复合浆液是在丙烯酸盐浆液的基础上研制出来的一种复合浆液，它既保留了丙烯酸盐浆液流动性好，固结体弹性好的优点，又大幅度地提高了浆液的抗压强度和粘结强度，因此在注浆时可以带来良好的综合灌注效果，还对复合浆液的粘度和强度进行了试验性研究。