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A series of Hokkaido events, recorded by the FBV Broadband Seismograph System at the KHC Seismic Station, is used to study the structure of the earthquake magnitude scale on the basis of maximum velocity amplitudesA
vmax of teleseismicPwaves in different period bands. Amplitude-periodband (APB) diagrams are constructed for each event. According to the shape of the APB diagrams the events investigated can be divided into three types: (a) events with largestA
vmax values in the intermediate period range (periods ofA
vmax from 2.2 to 23 sec), (b) events with largestA
vmax values in the short-period range (periods ofA
vmax from 1 to 2 sec), (c) events exhibiting anomalous APB diagrams. Type (a) events seem to represent the process of wave generation that prevails for shallow earthquakes. Type (b) events approach to explosive-like generation of seismic waves. The nature of the exceptionally occurring type (c) events must be clarified in further investigations. The influence of the type of earthquake on the magnitude values estimated on the basis of standard class A and B (short-period and intermediate-band) seismograms is demonstrated. It appears that for estimating correct values of earthquake magnitudes complementary information on the process of seismic wave generation in the focus is necessary. At teleseismic distances this information can be obtained from either APB diagrams or amplitude spectra ofP waves recorded, e.g., by broadband velocity sensing instruments. 相似文献
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关于震级误差成因的初步分析 总被引：1，自引：0，他引：1
就地震观测工作中的震级误差问题做了初步探讨分析，指出影响震级误差的原因，不仅与地震观测仪器的频谱特性有关，还与震源辐射的能量谱、震源的应力状态和震源深度的不同以及地震波震相、频率等有关，并对如何减少震级误差提出了措施和建议。 相似文献
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利用德令哈地震台DD—l记录到的746个近震，对其测定的震级偏差进行统计计算，发现DD—l测定的震级偏小。经过分析，指出了产生偏差的原因，并给出了校正值C= 0．15。 相似文献
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D. Albarello A. Berardi C. Margottini M. Mucciarelli 《Pure and Applied Geophysics》1995,145(2):297-312
A multi-parametric study of empirical relationships between macroseismic data and magnitude is presented for the Italian region by the analysis of a new extended data set concerning 146 earthquakes. The available magnitude determinations include all of the most intense earthquakes which occurred in Italy in the last century and have been obtained by an accurate revision of original instrumental data. Intensity data have been revised and upgraded on the basis of the most recent studies: only local intensities directly documented have been used. Macroseismic determinations ofM
s
,m
B
andM
wa
magnitudes have been performed. The empirical relationships between maximum felt intensity (I
max
) and magnitude have been determined by the use of a distribution-free approach and a linear regression analysis. This last parameterization allows for the explanation of more than 60% of the variation in magnitude. In order to improve these results, the linear dependence between magnitude,I
max
and average distances (in logarithm) corresponding to fixed attenuation values has been explored. The comparison between instrumental magnitudes and corresponding macroseismic estimates obtained from empirical relationships shows that the respective uncertainties are comparable. 相似文献
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利用上海遥测地震台网虹桥、南汇台深井地震速度记录资料讨论地震尾波衰减与震级关系.采用统计方法求得了用垂直向地震波持续时间 L 测定震级M_v 的公式M_v 虹桥=-0.981+1.677×log(L)+0.600×log(△)±0.22M_v 南汇=-1.461+1.979×log(L)+0.506×log(△)±0.22结果表明,地震速度记录的持续时间 L 的对数加上震中距(△,单位:km)的对数与震级在近震范围内(△<5°)呈线性关系,说明用地震速度记录同样可以测定地震震级,这有助于提高深井速度记录资料的推广和应用。 相似文献
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江西数字地震台网近震震级偏差与量规函数关系的研究 总被引：6，自引：0，他引：6
采用江西数字地震台网数字地震记录资料,选取自2007年10月正式运行至2009年12月所记录的138次ML≥1.5的地震事件,计算了各台站单台震级与台网平均震级的偏差、平均偏差和标准偏差,从震级偏差频次分布、量规函数、平均周期等因素对单台震级的影响上作了定量统计和分析。结果表明:①除九江、赣州、石城、都昌、高安5个台的震级与台网的平均震级偏差比较大外,其余台站均比较小;②目前所用量规函数在震中距小于40 km时偏小,大于330 km时偏大,给出了量规函数校正值,③平均周期小于0.17 s时,变得极不稳定,离散程度明显增大,这种情况应该是由于单台震中距超过300 km的样本数太少所导致的。 相似文献
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Preliminary Analysis of the Relationship between the Magnitude Deviation of the Station and Site Response in the Fujian Digital Seismic Network 
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下载免费PDF全文 Using the records of 3,069 regional earthquake events from the Fujian Digital Seismic Network from October 2008 to December 2015,in which the magnitude of each of the events was measured by at least six stations,statistics are taken on the deviation between the magnitude of a single station and the average magnitude of the network. It is found that the magnitudes average deviation of each station is-0. 31-0. 68. Statistics are also taken for the period corresponding to the maximum amplitude of the record measured in each station for calculating the magnitude,and the dominant period gained is 0. 06s-0. 38s; site response of each seismic station is inverted using the Moya method,and it is found that the site response of 98 stations is in the bands of 1-20 Hz,suggesting that the site has an amplifying or suppressing effect on the signals in certain frequency bands;Considering the site response corresponding to the inherent 0. 8s period of the WoodAnderson pendulum seismograph,and comparing the magnitude deviation caused by the site response corresponding to the dominant period time of each station with the average magnitude deviation, we obtain that there is a good linear relationship between the magnitude deviation from the dominant period site response and the average deviation of the magnitude of each station,indicating that the magnitude deviation of a single station has a close relationship with the site response of the period corresponding to the maximum amplitude measured for calculating the magnitude. 相似文献