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唐明帅 《地震地磁观测与研究》2004,(Z1)
引言乌鲁木齐区域数字地震遥测台网于2000年9月建设完成,10月开始投入观测运行。在台网中心的计算机网络系统中,实时地震数据处理机是网络系统中的核心计算机,各遥测子台地震信号都必须通过实时地震数据处理机进行实时接收和处理,分析人员才能够对各遥测子台的数据进行地震分析。刚开始由于我们对SCOUnix系统的管理与维护没有经验,加之乌鲁木齐遥测台网每天的数据量较大,以及实时地震数据处理机一直处于连续工作状态;实时地震数据处理机出现过系统资源使用匮乏、文件系统容量支持不够等故障,从而导致系统运行出现瘫痪现象,曾造成其中一台… 相似文献
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遥测台网传输信道选定陈阵阳（防灾技术高等专科学校）主题词：遥测台网，地震数据，传输信道１前言遥测地震台网就是把不同空间分布的地震台网检测到的地震信号用遥测的方式实时或准实时地传送到台网中心进行集中记录和统一授时并用计算机处理地震数据的一种地震台网。遥... 相似文献
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新疆乌鲁木齐区域数字遥测地震台网(以下简称区域台网)是在模拟遥测地震台网的基础上改造、扩建而成的。区域台网由数字汇集中心、4个中继站、12个遥测子台和9个准实时远程子台组成。中国地震局港震公司提供地震计、数据采集器和应用软件，新疆地震局与厂家共同研制无线同步传输设备。区域台网的技术系统采用了先进的数字地震观测技术，具有宽频带、大动态、高精度、高分辨率的特点，以无线实时传输台网为主，远程扩展子台为辅，构成了全国最大的省级台网。2001年4月22日，乌鲁木齐区域数字遥测地震台网通过了中国地震局专家组验收。 相似文献
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目前,地震系统先后在全国建立了六个有线、无线传输地震台网,台网记录和分析处理中心配置了两台DJS—131电子计算机。一台计算机系统是在XRTOS控制下的地震数据实时预处理——称为台网的预处理机系统。主要完成对地震前兆数据和大动态范围的地震数据汇集和初步编排工作。另一台计算机系统是在DTSS控制下的台网主机处理系统,这就是本文所 相似文献
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1 问题的提出辽宁省地震台网由辽宁遥测数字地震台网 (以下简称遥测台网 )和有人值守测震台 (下称台站 )组成。遥测台网由分布在全省各地的 1 5个遥测地震台站组成 ,但这些台站分布不够均匀 ,使得一些地区监测能力较弱。台站有的和遥测台在一起 ,有的则正好分布在没有遥测台的地区。为能在使用交互分析处理系统进行地震定位时 ,充分利用这些有人值守台的数据 ,使台网分布不够均匀的问题在一定程度上得到弥补 ,使地震定位精度得到进一步提高 ,本项目编制了面向台站速报的 LN-LHDW-1检测管理软件 ,以实现遥测台网与台站地震数据的联合定位… 相似文献
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乌鲁木齐遥测地震台网和新疆地震台网的地震定位与分析 总被引：1，自引：0，他引：1
利用新疆地震台网和乌鲁木齐遥测地震台网在乌鲁木齐地区１００ｋｍ范围内１９９３年６月至１９９３年１２月１０日各自定位的地震资料，以新疆地震台网为参考基准，将乌鲁木齐遥测地震台网的资料与其进行了对比。对比发现遥测地震台网比新疆地震台网在地震数量上多３２．９％，在定位精度上也相对要高一些。另外，根据地震定位的三种交切结果，分析了遥测台网地震定位现状。 相似文献
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乌鲁木齐遥测地震台网承担新疆地区大震速报和乌鲁木齐地区微震监测任务。随着国民经济的发展和数字化技术的成熟,在“八五”期间建设了乌鲁木齐模拟遥测台网;“九五”期间乌鲁木齐台网改造为数字化台网;“十五”期间,乌鲁木齐遥测台网将新建、改建、扩建为新疆数字化遥测台网。台网建成后,台网布局较为合理,将为新疆的抗震救灾,为地震预报和地震科学研究工作提供更加可靠、方便的资料。 相似文献
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乌鲁木齐遥测地震台网 总被引：1，自引：0，他引：1
乌鲁木齐遥测地震台网承担新疆地区大震速报和乌鲁木齐地区微震监测任务。随着国民经济的发展和数字化技术的成熟，在“八五”期间建设了乌鲁木齐模拟遥测台网；“九五”期间改造乌鲁木齐台网为数字化台网；“十五”期间，乌鲁木齐遥测台网将新建、改建、扩建为新疆数字化遥测台网。台网建成后，台网布局较为合理，将为新疆的抗震救灾，为地震预报和地震科学研究工作提供更加可靠、方便的资料。 相似文献
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阪神·淡路大震灾后 ,日本着手对原有的地震观测体制作彻底改革 ,多项全国性配置地震计的计划同时开始启动。地震引起的地面晃动的程度不尽相同 ,无感微小地震引发的晃动仅有 0 .0 0 1 μm,频率为1 0 Hz;巨大地震引起的地面晃动的幅度高达 2～ 3 m,周期也有几十秒。虽说都称之为地震计 ,但由于地震动的振幅和频率涉及的范围太大 ,所以应针对观测对象选用不同类型的地震计。下面介绍不同类型的观测网。1 强震观测网 ( K- NET)无论大地有多大的晃动都能将其准确记录下来的地震计称之为强震计。它构造坚实 ,信号明确 ,通常设置在地表 ,对了… 相似文献
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Michael O. Garcia Diane Hanano Ashton Flinders Dominique Weis Garrett Ito Mark D. Kurz 《Bulletin of Volcanology》2012,74(6):1445-1463
The size, shape, and magmatic history of the most recently discovered shield volcano in the Hawaiian Islands, Mahukona, have been controversial. Mahukona corresponds to what was thought to be a gap in the paired sequence (Loa and Kea trends) of younger Hawaiian volcanoes (<4?Ma). Here, we present the results of marine expeditions to Mahukona where new bathymetry, sidescan sonar, gravity data, and lava samples were collected to address these controversies. Modeling of bathymetric and gravity data indicate that Mahukona is one of the smallest Hawaiian volcanoes (～6,000?km3) and that its magmatic system was not focused in a long-lived central reservoir like most other Hawaiian volcanoes. This lack of a long-lived magmatic reservoir is reflected by the absence of a central residual gravity high and the random distribution of cones on Mahukona Volcano. Our reconstructed subsidence history for Mahukona suggests it grew to at least ～270?m below sea level but probably did not form an island. New 40Ar–39Ar plateau ages range from 350 to 654?ka providing temporal constraints for Mahukona’s post-shield and shield stages of volcanism, which ended prematurely. Mahukona post-shield lavas have high 3He/4He ratios (16–21?Ra), which have not been observed in post-shield lavas from other Hawaiian volcanoes. Lava compositions range widely at Mahukona, including Pb isotopic values that straddle the boundary between Kea and Loa sequences of volcanoes. The compositional diversity of Mahukona lavas may be related to its relatively small size (less extensive melting) and the absence of a central magma reservoir where magmas would have been homogenized. 相似文献
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In this study, we have checked the location and focal depth of the Yecheng earthquake (m b = 6.0, maximum intensity VII) of February 14, 1980. The result shows that this is an intermediate event with a focal depth of 90 km. The microepicenter is located at 36. 4°N, 76, 9°E, while the macroepicenter is at 37.3°N, 76.9°E, 90 km to the north of the microepicenter. This is the first destructive intermediate event in China which led to a damage as severe as of intensity VII. The focal mechanism of the event is determined to be of thrust type. Combined with the analysis of seismological and geological data in surrounding area, the possible relation between the event and plate movement has been discussed. The result in this paper indicates that in some particular place, the destructive effect of intermediate event should be considered in seismic hazard assessment. 相似文献
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Sun, climate, hunger, and mass migration 总被引：9，自引：1，他引：8
Kenneth J. Hsu 《中国科学D辑(英文版)》1998,41(5):449-472
Paleoclimatic studies indicate four epochs of global cooling during the last 4 000 years, i. e. during the few centuries before
and after 2000 BC, 800 BC, 400 AD, and 1 600 AD; the quasiperiodicity corresponds to cyclic variation of solar activity. Global
temperature changes influenced regional precipitation patterns: Northern Europe was wetter while the middle- and low-latitude
lands were more arid during colder epochs. Both sets of cold climatical conditions were unfavorable for agricultural production.
Historical records show that large demographic movements in history took place because of crop failures and mass starvation,
rather than escaping from war zones. The “wandering” of the Germanic tribes during the first two or three centuries of the
Christian Era is one example. Whereas the accelerated release of carbon dioxide from the burning of fossil fuels is ultimately
to cause global warming, historical evidence indicates, however, that global warming has been on the whole a blessing to mankind.
Global cooling, on the other hand, has curtailed agricultural production and has led to famines and mass migrations of people.
Perhaps the most important task at the present is not so much computer-modelling of greenhouse effect on global climate, but
water-management and agricultural researches to insure food-supply for an everincreasing world population. 相似文献
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In this study, we experimentally established the relationship between physical properties, vitrinite reflectance, and microstructure of coal, Taiyuan Formation, Qinshui Basin, China using representative coal samples collected from three different mines via the rock mechanics testing system (MTS). We analyzed the organic macerals, vitrinite reflectance, and microstructure of 11 coal samples using petrography and scanning electron microscopy (SEM). The experimental results suggest that (1) the elastic parameters can be described by linear equations, (2) both P-and S-wave velocities display anisotropy, (3) the anisotropy negatively correlates with vitrinite reflectance, and (4) the acoustic velocities and Young’s modulus are negatively correlated with the volume of micropores. The derived empirical equations can be used in the forward modeling and seismic inversion of physical properties of coal for improving the coal-bed methane (CBM) reservoir characterization. 相似文献