数字地震记录应用基础

介绍了数字地震记录的含义,数字地震记录仪器的分极结构和仪器响应,以及在频域和时域中数字记录去除模拟地震记录仪器响应的方法。     

428XL系统死机故障分析与排解方法

在大港探区新港Ⅰ期三维地震勘探中,428XL系统频繁出现了死机现象,如开机后仪器无故停止执行各项操作、放炮时系统操作窗口跳出软件错误信息、窗口之间可相互切换但软件却无法执行操作命令、采集数据流程被中断等。根据现场采取的降低系统软件版本等应急措施所呈现的效果及对428XL死机现象分析,认定这类故障是由于软件的兼容性存在问题所致。据此提出了使用超级排列、现场降级系统软件版本及强行中断server运行等方法,以解决428XL系统死机故障。     

中国地震局地震监测台网技术人员赴德国培训

中国地震局地震监测台网技术人员培训团一行15人于2000年9月2－20日赴德国地球科学研究中心（GFZ）和联邦地球科学及自然资源研究院（BGR）进行了培训，在德国的周密安排和中德以方的共同努力下，培训团圆满地完成了预期的培训任务，文章就这次的培训及培训团所了解到的情况作了介绍。     

CalculationoflongperiodresponsespectratoearthquakegroundmotionfromseismogramsofType513seismographs

ＣａｌｃｕｌａｔｉｏｎｏｆｌｏｎｇｐｅｒｉｏｄｒｅｓｐｏｎｓｅｓｐｅｃｔｒａｔｏｅａｒｔｈｑｕａｋｅｇｒｏｕｎｄｍｏｔｉｏｎｆｒｏｍｓｅｉｓｍｏｇｒａｍｓｏｆＴｙｐｅ５１３ｓｅｉｓｍｏｇｒａｐｈｓＹＡＮＸＩＡＮＧＹＵ（俞言祥）ＳＵＹＵＮＷＡＮ...     

利用深地震反射剖面揭示峨眉山大火成岩省下地壳结构

峨眉山大火成岩省位于扬子板块西缘,紧邻三江构造带,其复杂的地质背景使得该火成岩省的内带受到强烈改造和变形.由于缺少高精度的地球物理探测,导致对该地区地壳的精细结构了解不够,很大程度上影响了对大火成岩省形成机制的认识.我们在大姚元谋段实施了一条深地震反射剖面,试验了一种基于节点地震仪的深地震反射数据采集方法,得到了峨眉山...     

成都数字遥测台网微波中转设计中考虑的几个因素

将模拟地震遥测台网改为数字地震遥测台网，微波设备的改造是当务之急。根据经济实力选购合适的微波设备，了解所选设备的性能以及传输质量，使之适合成都传输台网已存在的设备条件。     

Green hope or greenwash? The actions of the European Union at the World Summit on sustainable development

This article examines whether the European Union (EU) could be seen as a normative power at the recent World Summit on Sustainable Development. We explain how the EU operationalised its commitment to the concept of sustainable development before highlighting the impact the EU had on the final summit outcomes. It shows that although in many areas the EU was able to offer leadership, internal policy coherence prevented it fully being able to develop that role and thus fully promoting the norm of sustainable development.     

Rapid morphological changes at the summit of an active volcano: reappraisal of the poorly documented 1964 eruption of Mount Etna (Italy)

While the eruptive record of Mount Etna is reasonably complete for the past 400 years, the activity of the early and late 1960s, which took place at the summit, is poorly documented in the scientific literature. From 1955 to 1971, the Central and Northeast Craters were the sites of long-lived mild Strombolian and effusive activity, and numerous brief episodes of vigorous eruptive activity, which led to repeated overflows of lava onto the external flanks of the volcano. A reconstruction of the sequence of the more important of these events based on research in largely obscure and nearly inaccessible sources permits a better understanding of the eruption dynamics and rough estimates of erupted volumes and of the changes to the morphology of the summit area. During the first half of 1964, the activity culminated in a series of highly dynamic events at the Central Crater including the opening of a fissure on the E flank of the central summit cone, lava fountains, voluminous tephra emission, prolonged strong activity with continuous lava overflows, and growth of large pyroclastic intracrater cones. Among the most notable processes during this eruption was the breaching of a section of the crater wall, which was caused by lateral pressure of lava ponding within the crater. Comparison with the apparently similar summit activity of 1999 allows us to state that (a) lava overflows from large pit craters at the summit are often accompanied by breaching of the crater walls, which represents a significant hazard to nearby observers, and that (b) eruptive activity in 1999 was much more complex and voluminous than in 1964. For 1960s standards however, the 1964 activity was the most important summit eruption in terms of intensity and output rates for about 100 years, causing profound changes to the summit morphology and obliterating definitively the former Central Crater.     

Investigating the spatial distribution of summit flats in the Uinta Mountains of northeastern Utah, USA

Isolated, laterally extensive, gently sloping surfaces known as summit flats are present at high elevations in many Laramide ranges, and are particularly well developed in the Uinta Mountains of northeastern Utah. To investigate the spatial distribution of these surfaces, and to consider possible controls on this pattern, a map of summit flats in the Uintas was developed from digital elevation data. Summit flats were identified as unglaciated areas of the landscape above an elevation of 3400 m, having a slope of less than 0.3 m m^− 1, and an area greater than 5 × 10^− 2 km². As defined, summit flats comprise 43% of the unglaciated land area above 3400 m in the Uintas, with the largest individual flat covering nearly 34 km². To quantitatively evaluate the distribution of summit flats in the Uintas, the area of summit flats was normalized to the total unglaciated area above 3400 m in 10-km-wide swaths oriented normal to the range axis. Values of percent summit flats obtained by this method decrease dramatically westward, from a high of more than 60% at the eastern end of the Uintas, to 0% at the western end. Given that individual summit flats can be diminished through lateral erosion by surrounding valley glaciers, and that the summit flats themselves were apparently never glaciated, this result suggests that glacial erosion has been more effective in the western Uintas over the course of the Quaternary. Focused glacial erosion at the upwind end of the range is consistent with the hypothesis that the proximity of Lake Bonneville enhanced precipitation over the western Uintas during the Last Glacial Maximum [Munroe, J.S., and, Mickelson, D.M., 2002. Last Glacial Maximum equilibrium-line altitudes and paleoclimate, northern Uinta Mountains, Utah, U.S.A. Journal of Glaciology, 48, 257–266].