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本文利用云南地区1900年以来发生的震中烈度等于或大于Ⅵ度的48个地震等烈度线,用最小二乘法分别求得了四个地震带和三个地震区以及整个云南的烈度衰减关系。当已知潜在震源时,可以为估计某一场地由一次大地震所造成的最大可能烈度和地震危险性提供一些依据。 文中根据统计结果分析比较了不同方向和不同地区的烈度衰减特征,表明烈度衰减规律具有明显的方向性和地区性。因此认为,区分不同地区建立各自相对独立的烈度衰减关系是有实际意义的。 最后,对统计分析中的某些问题也作了初步讨论。
In this paper, the intensity curves of 48 earthquakes with or without epicenter intensity equal to or greater than Ⅵ occurred in Yunnan since 1900 have been used to obtain the intensity attenuation relationships of the four seismic zones, the three seismic zones and the entire Yunnan region by the least square method. When a potential source is known, it can provide some evidence for estimating the maximum possible intensity and the seismic risk caused by a major earthquake at a site. In this paper, the intensity attenuation characteristics of different directions and different regions are analyzed and compared according to the statistical results, indicating that the intensity attenuation law has obvious directionality and regionality. Therefore, it is of practical significance to distinguish between different regions to establish their respective independent intensity decay relations. Finally, some issues in statistical analysis are also discussed.