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现代仪器记录
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  modern instrument record
     methods as well as historical data textual research, we discussed on the problems of which the reliability of historical seismic data and integrate use of modern instrument record data so that the appropriate b-value was determined, thus to better estimate the annual occurrence rate v-value represented seismicity level, and provided analysis of seismic fatalness with reliable activity parameters in the seismic zong.
     讨论华南沿海地震带历史地震的可靠性和与现代仪器记录资料统一使用的问题,确定合适的b值,进而较好的估计代表地震活动水平的年平均发生率ν值,为地震危险性分析提供可靠的地震带活动性参数
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  “现代仪器记录”译为未确定词的双语例句
     Based on basic data of seismic hazard assessment in Hunan, and new research works on attenuation relationship of moderate earthquakes (M≤6.0) as well as results of the study of background seismicity, a new result of seismic zonation for middle and south region in Hunan Province is provided.
     选择湖南省中南部地区作为研究区域,以编制《中国地震动参数区划图》的基础资料和近年来在湖南省中南部所作的工程场地地震安全性评价资料为基础,根据近年来对中强地震衰减关系的研究结果,以及1970年以来现代仪器记录得到的地震资料确定的研究区域背景地震活动水平及其参数,对湖南省中南部地区进行了新的地震区划研究。
短句来源
     Based on the basic data of seismic hazard assessment in Hunan, and the new research works on attenuation relationship of moderate earthquakes (M ≤ 6.0) as well as the results of the study of background seismicity, a new result of seismic zonation for middle and south Hunan province is provided.
     本文选择湖南省中南部作为研究区域,在《中国地震动参数区划图》编制的基础资料和近年来在湖南省中南部所作的工程场地地震安全性评价资料的基础上,根据近年来对中强地震衰减关系的研究结果,以及通过1970年以来现代仪器记录得到的地震资料确定的研究区域背景地震活动水平及其参数,对湖南省中南部进行了新的地震区划研究。
短句来源
     In addition,we discuss the problem of using historical data and recent observed data simultaneously and investigated also the influence of the 'bending' at both ends of the linear relationship,lgN = a - bM on b value estimation. Then we suggest the principle and method of choosing a reasonable b value in seismic hazard analysis.
     此外,本文还就历史地震资料和现代仪器记录资料的统一使用问题,lgN-M线性关系两端“掉头”对b值统计的影响问题也作了探讨,从而提出在地震危险性分析中b值选取的原则及合理选取b值的方法.
短句来源
     In order to improve reliability of probabilistic seismic hazard analysis, shallow earthquake (depth<70 km) data, which were recorded with location precision of 1 or 2 by modern instruments and contain depth information after 1970, are selected as statistical samples, as well as northern China seismic region, middle China seismic region, southern China seismic region, Xinjiang seismic region and Qinghui|Xizang Plateau seismic region are chosen as statistical units to study the depth distribution characteristic of shallow earthquakes.
     选取 1970年以来现代仪器记录到的含有深度信息、定位精度为 1、2类的浅源地震(深度小于 70km)资料作为统计样本 ,以华北地震区、华中地震区、华南地震区、新疆地震区和青藏高原地震区为统计单元 ,分析研究浅源地震随深度的分布特征 ,以便进一步提高地震危险性分析的可靠性。
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The b value is estimated from the statistics of actual earthquake data. It depends on the completeness and reliabilty of the data,the sampling size,sampling range in time and space,the threshold magnitude of earhquakes and the sampling interval,etc.In this paper,we use the relationship lgN = a-bM between the accumulative frequency and magnitude. In order to search for the after effects of various factors on the result of b value estimation,we estimate the b value with various thresholdmagnitude and magnitude...

The b value is estimated from the statistics of actual earthquake data. It depends on the completeness and reliabilty of the data,the sampling size,sampling range in time and space,the threshold magnitude of earhquakes and the sampling interval,etc.In this paper,we use the relationship lgN = a-bM between the accumulative frequency and magnitude. In order to search for the after effects of various factors on the result of b value estimation,we estimate the b value with various thresholdmagnitude and magnitude interval for different temporal and spatial ranges respectively. We found some way for reasonably obtaining the b value with experimental basis.In addition,we discuss the problem of using historical data and recent observed data simultaneously and investigated also the influence of the 'bending' at both ends of the linear relationship,lgN = a - bM on b value estimation. Then we suggest the principle and method of choosing a reasonable b value in seismic hazard analysis. Finally,we discuss the error range in estimating the b value and its impact on hazard analysis.

b值是从实际地震资料的统计中得到的.它与实际资料的完整性、可靠性、统计样本量的大小、取样的时空范围、样本的起始震级和取样间隔等因素都有关系. 本文使用累积频度-震级关系,lgN=a-bM,以起始震级为4 3/4和5;震级间隔为1/4,1/2和1级对不同尺度的时空范围进行统计,从中寻找各因素对b值统计结果的影响,为如何合理统计b值取得了一些实验依据. 此外,本文还就历史地震资料和现代仪器记录资料的统一使用问题,lgN-M线性关系两端“掉头”对b值统计的影响问题也作了探讨,从而提出在地震危险性分析中b值选取的原则及合理选取b值的方法.最后讨论了b值统计中的误差范围及其对危险性分析所产生的影响.

To establish a G—R relation for a special region,it is a usual method to estimate future numbersof earthquake according to earthquake contents.If the magnitude—frequency curve doesnot obey the G—R relation,or if the unintegral contents of earthquake event owing to the loss of records in the pasthistory(middle—small event)or in modern recording instrument(weak—small event),a bulgyupward curve will be shown.So we shall fail to get the real result.This paper points out that whetherthe first or second case goes...

To establish a G—R relation for a special region,it is a usual method to estimate future numbersof earthquake according to earthquake contents.If the magnitude—frequency curve doesnot obey the G—R relation,or if the unintegral contents of earthquake event owing to the loss of records in the pasthistory(middle—small event)or in modern recording instrument(weak—small event),a bulgyupward curve will be shown.So we shall fail to get the real result.This paper points out that whetherthe first or second case goes singly,or the both,or the both don't,the polygon relation of magnitude—frequency is alogical treating method.Here we stress the concept and pratice and we shall deduct itstwo sets algorithms(the least square method and the likelihoodmethod)and some theoretical tests inanother paper whose title is“PolygonRelation of Magnitude-Frequency:Its Algorithm andSignification”.

依据所关心地区的地震目录,建立起古登堡-里克特关系,并据此而推断该地区未来的缺震数,是一种常用的做法。然而,如果该地区的震级-频度关系是非古登堡-里克特的,或者即使是但由于地震目录不全(指历史地震目录的中小地震缺失和现代仪器记录的弱小地震缺失)而使震级-频度曲线呈系统性上凸,都将严重影响对未来缺震数的估计。本文指出,无论是哪一种情况,甚至是两种情况的耦合,折线型震级-频度关系都是合乎逻辑的处理方法。本文侧重于概念、实例,而在下文中则致力于算法推导和理论试验。

In order to improve reliability of probabilistic seismic hazard analysis, shallow earthquake (depth<70 km) data, which were recorded with location precision of 1 or 2 by modern instruments and contain depth information after 1970, are selected as statistical samples, as well as northern China seismic region, middle China seismic region, southern China seismic region, Xinjiang seismic region and Qinghui|Xizang Plateau seismic region are chosen as statistical units to study the depth distribution characteristic...

In order to improve reliability of probabilistic seismic hazard analysis, shallow earthquake (depth<70 km) data, which were recorded with location precision of 1 or 2 by modern instruments and contain depth information after 1970, are selected as statistical samples, as well as northern China seismic region, middle China seismic region, southern China seismic region, Xinjiang seismic region and Qinghui|Xizang Plateau seismic region are chosen as statistical units to study the depth distribution characteristic of shallow earthquakes. Considering the differences of depth distribution characteristics of earthquakes with different magnitudes, magnitude intervals as the following are adopted to analysize earthquakes with different sizes respectively: M S=2.0~2.9, M S=3.0~3.9, M S=4.0~4.9, M S=5.0~5.9 and M S=6.0~6.9. The results show that hypocenter depths are normally distributed by and large around the mean depth of the corresponding seismic region. The probabilistic distribution curves of earthquake depth in western China are wider than in eastern China. The probabilistic distribution deviation, σ, of western China is greater than that of eastern China, that is, earthquakes in western China have a wider range in terms of depth. There is also a tendency that the absolute value of mean hypocenter depth increases with magnitude by and large.

选取 1970年以来现代仪器记录到的含有深度信息、定位精度为 1、2类的浅源地震(深度小于 70km)资料作为统计样本 ,以华北地震区、华中地震区、华南地震区、新疆地震区和青藏高原地震区为统计单元 ,分析研究浅源地震随深度的分布特征 ,以便进一步提高地震危险性分析的可靠性。考虑到不同震级大小的地震在震源深度分布上的特征可能有所不同 ,我们采用了以下震级分档区间 :MS=2 0~ 2 9、MS =3 0~ 3 9、MS=4 0~ 4 9、MS=5 0~ 5 9、MS =6 0~ 6 9,对于不同大小的地震分别进行分析。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。西部地区地震的深度概率分布曲线的均方差σ比东部地区的大 ,也就是说西部地区的地震在深度空间上有着更大的分布范围。震源深度均值大体上也有随震级增大而增大的趋势。

 
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