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earthquake depth
相关语句
  震源深度
     In this paper,the statistic analysis has been made for the distribution of focal depth based on the data of 8935 earthquakes in the Tangshan area,spanninng from 1976 to 1981.The results obtained show that there are not the same in a magnitude and its distribution is closely correlated with the crustal structure. Increasing earthquake depth gradually varies from NE to SW.
     本文根据1976年7月28日到1981年12月唐山地区8935个地震,对其震源深度分布,进行了统计分析。
短句来源
     The probabilistic distribution curves of earthquake depth in western China are wider than in eastern China.
     结果表明 ,地震震源深度的分布基本上围绕着地震区震源深度平均值呈正态分布。
短句来源
  地震深度
     THE CHARACTERISTICS OF EARTHQUAKE DEPTH IN CHINA AND ITS ADJACENT AREA
     中国及其邻区地震深度的特征
短句来源
     Some spacio-temporal characteristics of earthquake depth in China and its adjacent area have been studied. 51 percent of the earthquakes occurred within 0-19 km below the earth surface. 20 km, 10 km and so on are some layers where earthquakes occurred frequently.
     系统地研究了中国及其邻区地震深度的一些时空变化特征后发现:51%的地震发生在0—19km间,10、15、20km为几个地震多发层位;
短句来源
     According to the latest more than 70,000 seismic recordings from USGS,the earthquake depth characteristics in China and Neighbouring rengion have been analyzed,especially for the ones in the four regions with moderate-deep focal earthquakes.
     根据USGS最新的 7万多条地震资料 ,分析了中国及其周邻地区的地震深度特征 ,特别是 4个中深源震区的深度特征。
短句来源
     According to the USGS earthquake data, we analyzed the depth characters of the earthquakes occurring in Jilin—Japan zone. The result showed that the earthquakes in Jilin—Japan were along the junction of the Pacific Plate and the Eurasia Plate, and the North Branch earthquakes were stronger than the South. At the same time, the relations of the earthquake depth, frequency and energy were opened out.
     根据USGS地震资料:分析了吉林—日本深震区地震的深度特征,结果表明:吉林—日本深震区地震位于太平洋板块与欧亚大陆板块的交界带上,其北支地震活动强于南支,同时也揭示了该区地震深度、地震频次以及地震能量之间的关系,指出其最容易发生强震的地震层位在570~580km左右。
短句来源
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  earthquake depth
Body wave inversion for the rupture process of these earthquakes finds the best: earthquake depth; focal mechanism; overall source time function; and seismic moment, for each earthquake.
      
In this paper we analyze seismic regime and earthquake depth distribution and correlation of seismicity and mud volcanism in the Azerbaijan and the Caspian Sea region.
      
In Table 4 the earthquake depth is referred to the sea level.
      


In this paper,the statistic analysis has been made for the distribution of focal depth based on the data of 8935 earthquakes in the Tangshan area,spanninng from 1976 to 1981.The results obtained show that there are not the same in a magnitude and its distribution is closely correlated with the crustal structure.Increasing earthquake depth gradually varies from NE to SW.The earthquake fault belt,which has an.angle of about 8?with the horizontal plain in the lower part and is in accordance with relief...

In this paper,the statistic analysis has been made for the distribution of focal depth based on the data of 8935 earthquakes in the Tangshan area,spanninng from 1976 to 1981.The results obtained show that there are not the same in a magnitude and its distribution is closely correlated with the crustal structure.Increasing earthquake depth gradually varies from NE to SW.The earthquake fault belt,which has an.angle of about 8?with the horizontal plain in the lower part and is in accordance with relief boundary in the upper,passes through the crust and down to the Moho.

本文根据1976年7月28日到1981年12月唐山地区8935个地震,对其震源深度分布,进行了统计分析。结果表明由东北向西南各区地震震源深度分布都具有优势层,大小地震的优势层也不相同,其分布与地壳结构密切相关,震源深度由东北向西南逐步加深,地震破裂带不但跨越地壳,甚至到莫霍面,在下部构成一个八度多的倾斜底面,上部则随G界面的起伏而变化。

Starting from the scaling law derived by authors and earthquake rupture model according to fracture mechanics, the average source spectra of displacement, velocity and acceleration have been obtained, then the expressions of peak displacement, velocity and acceleration have been derived, they areThe observed data of 66 earthquakes are selected, their range of seismic moment magnitude Mw, is very large, from tremors (Mw,1.0) to small earthquakes(Mw= 3-5), to large earthquakes (Mw = 6-7); the seismic moment is...

Starting from the scaling law derived by authors and earthquake rupture model according to fracture mechanics, the average source spectra of displacement, velocity and acceleration have been obtained, then the expressions of peak displacement, velocity and acceleration have been derived, they areThe observed data of 66 earthquakes are selected, their range of seismic moment magnitude Mw, is very large, from tremors (Mw,1.0) to small earthquakes(Mw= 3-5), to large earthquakes (Mw = 6-7); the seismic moment is from 109 to 1020 Nm, amount to 10 order magnitude. Above expressions are examinated by these data, and the results are encouraging.Setting average environment shear stress equal to 5MPa for all earthquakes, the constants kd,kv,ka can be determined, then the values of environment shear stress for 66 earthquakes are obtained from data of peak acceleration and velocity, these stress values r0 are quite stable. Most of r0 for tremors are from 2 to 4MPa; 4-8MPa for small earthquakes; about 10MPa for large earthquakes. There are obvious dependence of earthquake depth and fault type on environment shear stress. The values of environment shear stress are usually very low for tremors and small earthquakes with shallow depth; they are relatively low for normal fault earthquakes; they are relatively high for thrust fault earthquakes; they are intermediate for strike slip earthquakes.

从导出的地震定标律和地震破裂过程的断裂力学模式出发,得到了震源平均位移、速度和加速度谱的表达式,进而又推导出震源的峰值位移d_m,速度v_m和加速度a_m的表达式:d_m=k_dM_0~2/~3τ_0~(2/3),v=k_vM_0~(1/3)τ_0~(4/3),a_m=k_aτ_0~2式中M_0是地震矩,τ_0是环境剪应力值,k_d,k_v,k_a为适当的常数.我们选用了66个地震的观测资料,这些地震的矩震级范围包括了从1级左右的极微震,3—5级的小震,直到6—7级的大震;地震矩从10~9—10~(20)Nm,跨越了10个数量级,并用这些地震检验了上述公式. 令所有地震的平均应力为5MPa,定出常数k_d,k_v,k_a,进而由速度和加速度观测资料求得66个地震的环境剪应力τ_0值,这些数值相当稳定.多数极微震的τ_0值在2—4MPa之间;小震的τ_0值多数在4—8MPa左右;大震的τ_0值为10MPa左右。τ_0值对震源深度和断层类型有明显的依赖性.一般深度很浅的小震和极微震,τ_0值很低;正断层地震的τ_0值相对较低;逆断层地震的τ_0值较高;走滑断层地震的τ_0值则居中.

Some spacio-temporal characteristics of earthquake depth in China and its adjacent area have been studied. 51 percent of the earthquakes occurred within 0-19 km below the earth surface. 20 km, 10 km and so on are some layers where earthquakes occurred frequently. The depth of earthquakes in the mainland of China are shallower than that round the mainland. The earthquakes in west mainland are deeper than that in the east, it is identical with that the crust in west mainland...

Some spacio-temporal characteristics of earthquake depth in China and its adjacent area have been studied. 51 percent of the earthquakes occurred within 0-19 km below the earth surface. 20 km, 10 km and so on are some layers where earthquakes occurred frequently. The depth of earthquakes in the mainland of China are shallower than that round the mainland. The earthquakes in west mainland are deeper than that in the east, it is identical with that the crust in west mainland is deeper than that in the east. The eatthquakes in the border of China and Russia and Korea, Japanese Sea, Pamirs area, the Ryukyu Island, the border of india and Burma, and Taiwan are deeper than that in other area. It may be due to the collision, press and subduction of some plates. There are more and deeper earthquakes in Pamirs than in the border of india and Burma. The earthquake in the border of Tibet and Nepal are few and shallow, which indicated the active style that the india plate presses the Europe-Asia plate. The depths of early aftershocks varied in a large range, but the depths of late aftershocks tend to be a stable one. The deeper the earthquake is, the greater the magnitude is. The earthquake depth can be a principle for earthquake zoning.

系统地研究了中国及其邻区地震深度的一些时空变化特征后发现:51%的地震发生在0—19km间,10、15、20km为几个地震多发层位;大陆地震的深度小于周邻地区地震的深度;大陆西部地震的深度大于东部地震的深度,这与大陆地壳西厚东薄的结果相吻合;中俄朝交界区及日本海、兴都库什-帕米尔、琉球群岛、缅印交界区和台湾地区地震的深度大,这与有关板块间的相互碰撞、挤压或俯冲等运动有关;兴都库什-帕米尔地区的地震多且远深于缅甸中西部的地震,而西藏-尼泊尔地区的地震少且浅,这揭示了印度板块向欧亚大陆挤压的方式,大震初期余震的深度变化范围大,而后期余震则多趋向发生在一稳定的深度上,较深地震的震级一般也大。地震深度可作为地震分区(带)的原则之一,它也有助于地震的地点预报。

 
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