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应用黑龙江省数字遥测地震台网2002—2006年目录数据,对绥棱采石场附近爆破进行重新定位,对比GPS实测位置,研究该黑龙江省数字地震台网"十五"数据处理软件系统(MSDP人机交互系统)提供的5种定位程序,初步认为,对于网内浅源地震定位,单纯型法优于其他方法。 相似文献
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应用黑龙江省数字遥测地震台网2002-2006年目录数据,对绥棱采石场附近爆破进行重新定位,对比GPS实测位置,研究该黑龙江省数字地震台网“十五”数据处理软件系统（MSDP 人机交互系统）提供的5种定位程序,初步认为,对于网内浅源地震定位,单纯型法优于其他方法。 相似文献
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新建成的首都圈数字地震台网由 10 7个数字地震台站组成 ,其地震监测和定位能力需要检验。此文主要目的是为评估首都圈数字地震台网的地震活动监测能力提供参考依据。在地震定位中 ,应充分发挥数字地震记录的优势 ,采用相应的数字地震记录处理技术 ,提高地震定位的可靠性和精度。采用滤波、偏振及台站扫描、震相追踪等数字技术 ,提高了震相识别的可靠性和精度 ,并用Geiger方法对 2 0 0 1年首都圈数字地震台网记录到的 7个网内及网缘微震 (ML<2 .0 )进行了精确定位 ,还通过对爆破的定位来检验程序和方法的可靠性和精度。结果表明 ,震中定位误差估计小于2km ,震源深度误差估计小于 3km 相似文献
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对江苏数字地震台网的波形资料,从震相、频谱、振幅比3个方面进行对比分析,找出天然地震、人工爆破、塌陷的不同之处,能够在地震定位过程中快速识别,并将此方法在江苏地震台网实际工作中应用。 相似文献
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区域数字地震台网实时速报系统试运行情况分析 总被引：3，自引：0，他引：3
研制了一套区域数字地震台网实时速报系统,并于2005年7月在福建数字地震台网试运行.本文对系统在2005年7月至2006年5月间处理的网内震和网缘震进行了统计与分析.结果表明,系统对90%以上网内ML≥2.0地震的处理结果达到中国地震局地震速报评比满分的要求;系统对网内线以外100 km区域范围内ML≥2.5的网缘地震也有一定监控能力.本文对系统处理其他网缘震、网外震与人工爆破的不足之处也进行了分析与讨论. 相似文献
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通过分析云南数字地震台网1998~2006年的地震记录资料,给出了该台网的深远地震震相记录特征,避免了常规分析方法中将深远地震误作浅源地震而带来的定位误差;利用1978年1月~2005年8月的深远地震记录资料,绘制了全球深远地震震中分布图,以作为地震速报的参考。 相似文献
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山西数字遥测地震台网于2000年10月1日投入考核运行，为使数字遥测地震台网与模拟地震台网测定的时、空、强地震参数顺利接轨，尽快发挥数字资料在日常工作中的效益，将山西数字遥测地震台网产出的资料与模拟地震台网产出的资料作了全面细致的对比分析，研究了它们之间的相关程度、一致性、差异性。结果表明，数字地震观测系统比模拟地震观测系统具有更高的拴震率，得出山西数字遥测地震台网产出的资料与模拟地震台网产出资料相关性较好、定位结果在误差范围之内、符合《数字地震及前兆观测技术规范》要求的结论。 相似文献
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爆破、矿震与地震的波谱差异 总被引：10，自引：3，他引：7
根据辽宁数字地震台网记录的爆破、矿震与地震的数字资料,采用波谱分析的方法,选取4个台站对其所在区域182个爆破、矿震与地震事件的记录,对比研究波谱特征,发现爆破、矿震与地震的纵横波拐角频率fc(P,S)及最大谱值等存在的差异。 相似文献
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山东数字地震台网地震自动定位系统运行分析 总被引：1，自引：0，他引：1
山东数字地震台网自主研制了一套地震自动定位软件系统,2008年5月在山东地震台网中心试运行,运行稳定。本文对该系统运行期间自动定位结果进行了统计与分析,结果表明,山东数字地震台网自动定位系统对于网内天然地震定位结果可靠,震中平均偏差4．09km,震级偏差±0．08,平均速报用时63s。 相似文献
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Gtz Schroth Luciana Ferreira Da Silva Marc‐Andree Wolf Wenceslau Geraldes Teixeira Wolfgang Zech 《水文研究》1999,13(10):1423-1436
The partitioning of rain water into throughfall, stemflow and interception loss when passing through plant canopies depends on properties of the respective plant species, such as leaf area and branch angles. In heterogeneous vegetation, such as tropical forest or polycultural systems, the presence of different plant species may consequently result in a mosaic of situations with respect to quantity and quality of water inputs into the soil. As these processes influence not only the water availability for the plants, but also water infiltration and nutrient leaching, the understanding of plant effects on the repartitioning of rain water may help in the optimization of land use systems and management practices. We measured throughfall and stemflow in a perennial polyculture (multi‐strata agroforestry), monocultures of peach palm (Bactris gasipaes) for fruit and for palmito, a monoculture of cupuaçu (Theobroma grandiflorum), spontaneous fallow and primary forest during one year in central Amazonia, Brazil. The effect on rain water partitioning was measured separately for four useful tree species in the polyculture and for two tree species in the primary forest. Throughfall at two stem distances, and stemflow, differed significantly between tree species, resulting in pronounced spatial patterns of water input into the soil in the polyculture system. For two tree species, peach palm for fruit (Bactris gasipaes) and Brazil nut trees (Bertholletia excelsa), the water input into the soil near the stem was significantly higher than the open‐area rainfall. This could lead to increased nutrient leaching when fertilizer is applied close to the stem of these trees. In the primary forest, such spatial patterns could also be detected, with significantly higher water input near a palm (Oenocarpus bacaba) than near a dicotyledonous tree species (Eschweilera sp.). Interception losses were 6·4% in the polyculture, 13·9 and 12·3% in the peach palm monocultures for fruit and for palmito, respectively, 0·5% in the cupuaçu monoculture and 3·1% in the fallow. With more than 20% of the open‐area rainfall, the highest stemflow contributions to the water input into the soil were measured in the palm monocultures and in the fallow. Copyright © 1999 John Wiley & Sons, Ltd. 相似文献
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M. N. French R. L. Bras W. F. Krajewski 《Stochastic Environmental Research and Risk Assessment (SERRA)》1992,6(1):27-45
A procedure for short-term rainfall forecasting in real-time is developed and a study of the role of sampling on forecast ability is conducted. Ground level rainfall fields are forecasted using a stochastic space-time rainfall model in state-space form. Updating of the rainfall field in real-time is accomplished using a distributed parameter Kalman filter to optimally combine measurement information and forecast model estimates. The influence of sampling density on forecast accuracy is evaluated using a series of a simulated rainfall events generated with the same stochastic rainfall model. Sampling was conducted at five different network spatial densities. The results quantify the influence of sampling network density on real-time rainfall field forecasting. Statistical analyses of the rainfall field residuals illustrate improvement in one hour lead time forecasts at higher measurement densities. 相似文献
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M. A. Kahn 《洁净——土壤、空气、水》2000,28(2):95-101
Red tide, a recurrent phenomenon has become conspicuous in several Kashmir lake ecosystems since 1991. The responsible organism (Euglena pedunculata), a rare flagellate rediscovered in the Kashmir Himalaya (Khan 1993) caused first and unprecedented red tide outbreak, constituting a maximum of 96% of resident numerical phytoplankton density in Dal Lake. At present, conflicting hypotheses exist on the generation of causal assemblage(s) imparting redness to waters: Jeeji Bai (1991) linked its origin to acid precipitation – a fallout of burning oil‐fields during the Gulf War – whilst Khan (1993) holds local factor(s) responsible. Field/experimental studies support the latter contention that the influx of untreated sewage, in unison with warm temperatures, high levels of PhAR, iron and interruption to hydrological flow‐pattern together with absence/or reduction in grazing activity created conducive environmental milieu for red tide outbreak. Dal Lake “red tide” drifted the bloom‐inoculum to other waters, including Lake Wular, where additional ecological niches were carved out, threatening the aesthetic value and biological diversity of Kashmir lakes. Ecological monitoring indicates frequent seasonal red tide occurrence in Dal Lake (including summer‐autumn event of 1998) which testifies its unabated eutrophication status. Further studies are needed on ecological adaptability and biogeographic distribution of this rare and unique red tide‐causing flagellate. 相似文献
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