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唐山地震序列空间分布复杂性原因研究
刘蒲雄,吕晓健
Author NameAffiliation
Liu Puxiong Institute of Earthquake Science, CEA, Beijing 100036 , China 
Lv Xiaojian Institute of Earthquake Science, CEA, Beijing 100036 , China 
摘要:
通过采用唐山地震序列定位精度较高的资料,对不同时段余震震中分布进行再分析,取得了余震密集带和序列三次强震(7.8级、7.1级、6.9级)破裂面分布的清晰图像,其中判定7.1级地震为NWW向破裂面。上述复杂图像与震前地震活动异常所揭示的震源及与震源孕育密切有关的三组区域性断裂带存在密切联系。简单说来,震源位于NE向、NWW向、NW向三组断裂带交汇的区域,位于震源的余震密集带显示了这三次强震的破裂面,它们分别可看作是三组区域断裂的闭锁段。据此解释了形成唐山地震震源和序列震中分布复杂性的原因。
关键词:  唐山地震 余震震中分布 前兆地震活动 震源断层 区域断裂带
DOI:
分类号:
基金项目:
Study on the Cause of Complex Spatial Distribution of the Tangshan Earthquake Sequence
Liu Puxiong,Lv Xiaojian
Abstract:
By analyzing higher-accuracy location data of the Tangshan earthquake sequence, a clear distribution pattern of three aftershock belts in the NE, NWW, and NW directions of has been obtained. The analysis reveals three rupture planes of strong events of Ms7.8, Ms7. 1 and Ms6.9 in the sequence. It indicates that the complex pattern is closely related to the earthquake source, and the NE-, NWW- and NW-trending regional fault zones, which have been revealed by the research of the pre-seismicity anomaly. In summary, the source is locate d in the junction of the three fault zones , and the rupture planes of the three strong events located in the source can be regarded as the locked segments on the three fault zones. On these grounds, the paper explains the complexity of the source and epicentral distribution of aftershocks.
Key words:  Tangshan earthquake  Earthquake sequence  Precursory seismic activity  Earthquake source fault  Fault zone