1900年以来祁连山地震带7级以上地震衰减特征
Attenuation Characteristics of Earthquakes with M ≥ 7.0 in Qilian Mountain Seismic Zone Since 1900
摘要: 文章通过对1900年以来祁连山地震带7级以上强震发生后震中区范围内5级以上地震的发生情况进行分析,发现该区域7级以上强震发生后1~6年震中100~220 km范围内5级地震活动明显增强,表现为增震效应;7级以上强震发生的23~56年震中100~220 km范围内5级地震活动减弱,表现为减震效应。由于发震构造的不同,1920年海原的8 1/2级地震和1927年古浪8级地震的余震活动特征存在较大差异。
Abstract: In this paper, the occurrence of earthquakes with M ≥ 5.0 in the central area after strong earth-quakes with M ≥ 7.0 in the Qilian Mountain seismic zone since 1900 is analyzed. It is found that earthquakes with M ≥ 5.0 within 100~220 km of the epicenter are obviously enhanced 1~6 years after earthquakes with M ≥ 7.0 in this region, which shows the seismicity enhancement effect. The seismicity of earthquakes with M ≥ 5.0 after 23~56 years strong earthquakes with M ≥ 7.0 decreases within 100~220 km of the epicenter, which shows the damping effect. Due to the different seismogenic structures, the characteristics of aftershock activity of Haiyuan M8 1/2 earthquake in 1920 and Gulang M8 earthquake in 1927 are quite different.
文章引用:任雪梅, 李文君. 1900年以来祁连山地震带7级以上地震衰减特征[J]. 地球科学前沿, 2023, 13(8): 979-986. https://doi.org/10.12677/AG.2023.138093

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