Frequency-magnitude relationships of southern African seismicity
Frequency-magnitude relationships of southern African seismicity
复制标题
南部非洲地震活动的频率-震级关系
DOI：
10.1016/0040-1951(89)90077-2
复制
发表时间：
1989
期刊：
影响因子：
2.9
通讯作者：
A. D. Plessis
中科院分区：
文献类型：
--
作者：
A. Shapira;L. M. Fernandez;A. D. Plessis
从地震活动图、该区域现有地震事件目录的完整性以及频率-震级关系的角度讨论了南部非洲的地震活动。目前的地震目录对于1950年以来ML ≥ 4.6的地震、1910年以来ML ≥ 4.9的地震和1906年以来ML ≥ 5.3的地震似乎是完整的。对地震统计数据的分析表明，自然地震的b值为1.1，而矿震的b值则增加到1.5。最大预计震级为7.5级，可能发生5.12级矿震。结论是，需要更多的高质量的数据，从更多的地震台站，以合理地研究该地区的地震构造特征。
The seismicity of southern Africa is discussed in terms of seismicity maps, the completeness of the existing catalogue of seismic events for the region and frequency-magnitude relationships. The present catalogue of earthquakes seems to be complete for events of M L≥ 4.6 since 1950, for events of M L≥ 4.9 since 1910 and for events of M L≥ 5.3 since 1906. Analysis of earthquake statistics reveals a b-value for natural earthquakes of 1.1, increasing to 1.5 for mine tremors. It is suggested that the maximum expected magnitude of an earthquake in the region is in the order of M= 7.5 and that mine tremors as high as M~ 5 1 2 may occur. It is concluded that much more high quality data from more seismograph stations are required to sensibly investigate the seismotectonic characteristics of the region.