北天山中段微震活动检测及其活动性和孕震构造分析

Abstract

Abstract: The North Tianshan Seismic Belt in China has complex seismogenic structures with high risk of strong earthquake. The 2016 Hutubi M_S6.2 earthquake and the 2017 Jinghe M_S6.6 earthquake occurred successively in recent years. However, because the seismic network of North Tianshan is relatively sparse, the ability to monitor micro-seismicity in this area is weak. In this paper, we detected microseismic events from continuous waveforms with the waveform matched filter technique in the middle section of the North Tianshan Mountains (about 43.5°N~44.5°N, 85°E~87.5°E), relocated them with revised velocity structure, and then analyzed the characteristics of seismicity and seismogenic structure in this area. The scan detected 57 902 events in the study area from January 2014 to September 2018, about 10 times earthquake events in CENC (China Earthquake Networks Center) catalog, and the complete magnitude decreased from 1.2 to 0.5. The results show that there are obvious swarm activities in the study area, which mainly occurred after the Shawan and Hutubi earthquakes and distributed in the shallow southern flank of the Huoerguosi-Manasi-Tugulu anticlinal belt and deep South Manasi-Qigu anticlinal belt. Earthquakes along the strike of anticlinal tectonic belt are unevenly distributed. Earthquakes in the western Huoereguosi-Manasi-Tugulu anticlinal belt are more than that in the eastern part. But the earthquake magnitude in eastern South Manasi-Qigu anticlinal belt is significantly larger than that in the western part. After relocation, we found that the seismic events in the study area mainly occurred on the "blind faults" within the folds. The regional large active faults and concealed faults in anticlinal structures gave birth to active seismicity in the piedmont of the North Tianshan Mountains, and would become the sources of future strong earthquakes.

Key words: the North Tianshan Seismic belt, Fold faults, Seismicity, Matched filter technique

CLC Number:

P315.7

YAN Kun, WANG Wei-jun, WANG Qiong, YANG Feng, LIU Ning, KOU Hua-dong. Discussion on the Seismicity and Seismogenic Structure in Fold-and-thrust Belt of Northern Tianshan Mountains[J]. EARTHQUAKE, 2019, 39(3): 43-60.

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Discussion on the Seismicity and Seismogenic Structure in Fold-and-thrust Belt of Northern Tianshan Mountains

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