碲的泡塑预分离M17树脂富集原子荧光测定法

采用王水溶样，泡沫塑料预分离金等干扰组分，以Ｍ１７树脂富集Ｔｅ并使之与大部分共存的干扰元素分离，建立了原子荧光含金地质样品中碲的方法，用地矿部标准参考样品和含金地质试样分析考察，结果满意。方法检测下限为０．００９×１０＾－６。     

The Darwin Rise demise: the western Pacific guyot heights trace the trans-Pacific Mendocino fracture zone

The Darwin Rise has been proposed so many times and in so many forms and places that the time has come to make a more comprehensive examination of the region. Lying on the NW Pacific Plate between the Geisha Guyots, the Mid-Pacific Mountains, the equator, and the trenches, the region is roughly bounded by magnetic anomaly M20 (147 Ma). It was subjected to a massive outpouring of lava about 105 to 120 Ma, which created the guyots and seamounts in that region. Guyots are excellent tools for studying events of long ago because they eroded in the same lowstand in the Cretaceous and guyot relief, therefore, is a surrogate for paleo-sealevel. The relief is derived by subtracting the break depth of the summit plateau of a guyot from the regional depth. Guyot relief would necessarily be less in the center than to the periphery if the feature formed on a pre-existing rise, as has been postulated. The existence of a paleo-Darwin Rise would give concentric contours for the region in question. Of the sixty guyots used in this study, thirty-seven of these guyots were surveyed using SASS multibeam in the Marcus-Wake seamount group. Twenty-three guyots were surveyed using random track single-beam sonar surveys. An entirely different scenario is shown. Data revealed a major fracture passing through the area coevally or after the guyots formed. Because the depths to the summit are not the same now, vertical tectonics occurred after subaerial erosion. This means the fracture formed during and after the erosion (roughly 105 Ma) and influenced the normal sequence of events in guyot formation. Depending on how one deciphers trends through the Hess Rise morass, SASS bathymetry shows a continuation of the Surveyor/Mendocino fracture zone swarm inside the M20 region to the NE of these data. The fracture swarm continues to the western Pacific trench system. Based on this information, if the Darwin Rise ever existed, it had to have done so elsewhere.     

2003年6、7月西昌二次4.8级地震的预测与分析

2003年6月17日和7月10日,先后在四川省西昌市和西昌-昭觉间发生2次ML4 8级强有感地震.对于这2次地震,我们曾作了较好的中期和短期预测.但是对于6月17日发生的第一次ML4 8级地震,未能做出临震预测;对于第二次地震,则在7月1日向上级填报的周会商表中作了明确的临震预测,7月10日,在西昌-昭觉间发生了ML4.8级地震.根据西昌地震遥测台网各子台的P波初动求解震源机制,结合地震所处的地质构造以及现场烈度考察圈定出的结果分析,认为这二次地震是由安宁河断裂带、则木河断裂、凉山断裂所围成的凉山小菱形块体活动的结果.     

基于“双差法”地震精确定位研究2002年12月14日玉门5.9级地震的发震断层和发震机制

利用双差地震定位方法对2002年12月14日玉门5．9级地震主震和余震序列进行了精确定位，在此基础上讨论了本次地震的发震断层和发震机制。     

2001年昆仑山口西8.1级地震同震形变场特征的初步分析a

利用差分干涉雷达测量技术获取的宏观震中区的同震形变场，结合对地震活动性、震源机制、野外考察等资料分析，对昆仑山口西8.1级地震同震形变场特征进行了研究. 结果表明:宏观震中位于库赛湖东北侧，宏观震中区发震断层可分为两个形变中心区域，其中西段长约42 km，东段长约48 km，整个发震断层主破裂段长90 km；由干涉形变条纹分布格局可清楚地判断出发震断层的左旋走滑特征；断层两盘变形特征不同，南盘变形程度明显大于北盘；宏观震中附近最大斜距向位移量为288.4 cm，最小斜距向位移量为224.0 cm，宏观震中发震断层最大左旋水平位错为738.1 cm，最小地面左旋水平位错为551.8 cm.      

云南地区4级地震频度异常特征与强震关系研究

对云南地区18次MS≥6强震事件前中、小地震活动过程进行了分析,发现在这些地震发生前1—3年近场区2°×2°范围内4级地震频度基本上出现了显著增强现象,可以用4级地震年累计频度进行定量描述。通过全时空的扫描,确定年累计频度N≥4为异常阈值,该指标通过了置信度97.5%的R值内符检验。并用调整单元对强震附近4级地震活动增强现象给予了物理解释。     

The Frozen Soils and Devastating Characteristics of West Kunlun Mountains Pass Ms 8.1 Earthquake Area in 2001

The investigation on damages to frozen soil sites during the West Kunlun Mountains Pass earthquake with Ms 8.1 in 2001 shows that the frozen soil in the seismic area is composed mainly of moraine, alluvial deposit, diluvial deposit and lacustrine deposit with the depth varying greatly along the earthquake rupture zone. The deformation and rupture of frozen soil sites are mainly in the form of coseismic fracture zones caused by tectonic motion and fissures,liquefaction, seismic subsidence and collapse resulting from ground motion. The earthquake fracture zones on the surface are main brittle deformations, which, under the effect of sinlstral strike-slip movement, are represented by shear fissures, tensional cracks and compressive bulges. The distribution and configuration patterns of deformation and rupture such as fissures, liquefaction, seismic subsidence and landslides are all related to the ambient rock and soil conditions of the earthquake area. The distribution of earthquake damage is characterized by large-scale rupture zones, rapid intensity attenuation along the Qinghai-Xizang (Tibet) Highway, where buildings distribute and predominant effect of rock and soil conditions.     

Features of the M7.9 Earthquake in the Russia- Mongolia- China Boundary Region

At 19:33 p. m on September 27, 2003, an earthquake with M7.9 occurred in the RussiaMongolia-China boundary Region. It was strongly felt in the Altay region of Xinjiang. The losses caused by the earthquake was 76 million yuan (RMB). Some information about the earthquake was outlined, including basic parameters, focal mechanism, evaluation of earthquake disaster losses and so on. The satellite remote sensing information worked initial analysis for deformation of ground and failure phenomenon.     

2003年2月14日石河子M5.4地震地形变异常及其演化分析

分析了新疆石河子M5.4地震前震中250 km范围内定点形变的观测资料,认为从2002年5月到震前,单测项异常随时间起伏,多台异常在时间上连续发展并呈增加趋势,震前20天位于震中附近的台站出现临震突变;异常在空间呈现由西向东、由南向北,逐渐向震中区发展的态势.与1996年沙湾M5.2地震前的形变异常进行比较,认为存在较大的差异.     

小波分析方法在提取井水位潮汐因子震前变化特征的初步应用

运用小波分析方法对1990年常熟、1995年苍山和1996年南黄海三个中强地震前江苏地区井水位固体潮的变化特征进行了研究，发现井水位M2波潮汐因子在地震前几个月几乎都出现一个幅度较大、周期为半月或一个月左右的异常信号，表明小波分析方法在处理和分析井水位潮汐资料方面可能是一种有效的方法。