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spatial variation characteristic
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  空间变化特征
     The spatial variation characteristic analysis of rice production in Zhejiang province based on GIS
     基于GIS的浙江省水稻产量空间变化特征分析
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  相似匹配句对
     The variation of I.
     研究结果表明:I.
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     The variation of spatial distribution of N, P, K, S, B and Zn was significant.
     土壤中N、P、K、S、B、Zn的空间分布具有明显的变异性。
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     Progress in spatial variation was also discussed.
     对空间变异研究进展作了简要讨论。
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     The Characteristics of Spatial Variation of Larix Forests in Mainland of China
     我国落叶松林生产力的空间变化特征
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     SOURCE AND VARIATION
     本源与变异 素描作品展作品选登
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The temporal and spatial variation characteristics of anplitude attenuation coefficient K which are estimated by small earthquakes S-waves and coda before moderate earthquakes are studied. The results are as follows: The K values decreased before major earthquake occurred in the South Yellow Sea and Luguan of Yunnan Province, the averages amounts of descent are about 30 and 40 per cent. The major earthquake would occur on the border of the area where K values of small local earthquakes descended. As for...

The temporal and spatial variation characteristics of anplitude attenuation coefficient K which are estimated by small earthquakes S-waves and coda before moderate earthquakes are studied. The results are as follows: The K values decreased before major earthquake occurred in the South Yellow Sea and Luguan of Yunnan Province, the averages amounts of descent are about 30 and 40 per cent. The major earthquake would occur on the border of the area where K values of small local earthquakes descended. As for the earthquake of Xiaguan-Fengyi in Yunnan, the K values showed higher or lower than the normal values at the same time, and it is by an average of 34% above and 20% below the normal value respectively. The K values approached to the normal before the main shock. The main shock occurred on the boundary of the epicenteral distribution of small earthquakes with low K value, and the epicenters of small earthquakes with high K value were in the outside of the seismogenic zone.The variations of predominant frequency attenuation coefficient a value with time are also described in this paper. The a value decreased and by an everage of 40 - 50 per cent before main shock, but its errors are larger than that of K value.

本文探讨了中强地震前的小震地震波振幅衰减系数K值的时空变化特征,发现南黄海地震和云南禄劝地震在主震发生前一年半左右的时间内,K值持续下降,平均下降幅度为30%~40%左右,主震发生在显示K值降低的小震震中分布区的边缘。而云南下关凤仪地震则同时出现了K值高于和低于正常值的情况,平均高于和低于正常值的幅度分别为34%和20%,主震前这两部分K值的变化均趋于正常值,主震发生在显示低K值的小震震中分布区的边缘,显示高K值的小震震中位置则分布在孕震区附近的外围地区。 本文同时探讨了卓越频率衰减系数α值随时间的变化特征,发现主震前α值下降,在云南地区平均下降幅度约为40%~50%,但误差比K值大。

In this paper, the 10-year monthly mean surface sensible heat fluxes at 14 stations over Hexi and Tibet Plateau regions have been calculated based on the monthly mean data of the conventional surface observations during the period of 1971~1980, and their annual and spatial variation characteristics have also been analysed. It has been found that their annual variations are quite good agreement with that of surface net radiation, but there are some differences in Hexi and Plateau regions, even in...

In this paper, the 10-year monthly mean surface sensible heat fluxes at 14 stations over Hexi and Tibet Plateau regions have been calculated based on the monthly mean data of the conventional surface observations during the period of 1971~1980, and their annual and spatial variation characteristics have also been analysed. It has been found that their annual variations are quite good agreement with that of surface net radiation, but there are some differences in Hexi and Plateau regions, even in west and east parts of Hexi area. In addition, the results of the power spectrum analyses of monthly mean surface sensible heat fluxes over Hexi region in winter show it is likely that there exists the periodicity about three years.

本文利用1971~1980年河西走廊12站地面月半均气候资料,计算并分析了河西走廊地-气之间感热交换的时空变化特征。结果表明:河西走廊各站地面感热通量的年变化与地面净辐射能收支的年变化完全一致,此特点与高原不同;在该区内地面感热通量的年变化有明显的地域差异;功率谱分析发现,该区月平均地面感热通量有显著的准3年周期波动。

In this paper, the temporal-spatial variation characteristics of wave velocity ratios of small earthquakes before the Heze earthquake with Ms 5.9 are studied. It is found that there is a concentrative area of low value anomaly of wave velocity ratios near Heze for two years. When the wave velocity ratio rises again up to the maximum value in the concentrative area, the activity of small earthquakes becomes quiet. Then the low values of wave velocity ratios extend toward outer. When the wave velocity ratios...

In this paper, the temporal-spatial variation characteristics of wave velocity ratios of small earthquakes before the Heze earthquake with Ms 5.9 are studied. It is found that there is a concentrative area of low value anomaly of wave velocity ratios near Heze for two years. When the wave velocity ratio rises again up to the maximum value in the concentrative area, the activity of small earthquakes becomes quiet. Then the low values of wave velocity ratios extend toward outer. When the wave velocity ratios of small earthquakes in the periphery change to the minimum value, and then the values rise again to normal, the mainshock occurred in the concentrative area of low values. Before the mainshock, the low values of wave velocity ratios last three years, restoring to the normal values until about 15 days prior to the mainshock. Finally, some relative problems about the wave velocity ratio anomaly are discussed.

本文研究了荷泽5.9级地震前小震波速比时空变化特征,发现在荷泽附近大约2°×2°范围内出现了持续两年的小震波速比低值异常集中分布区,当集中区内波速比回升到极大值后小震活动平静,然后波速比低值区向外围扩散,当外围出现波速比极小值且逐渐回升后,在低值集中区内主震发生。震前小震波速比低值异常持续三年,直到主震前半个月波速比恢复正常。最后本文对波速比异常的有关问题进行了讨论。

 
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