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Spatiotemporal Evolution of Earthquakes in Longmenshan Fault and Adjacent Area, before and after the 2008 Wenchuan Earthquake
Shock and Vibration ( IF 1.6 ) Pub Date : 2021-11-24 , DOI: 10.1155/2021/9400276
Gang Fan 1, 2 , Jun Wang 3 , Shunchao Qi 1 , Gongda Lu 1 , Xingguo Yang 1 , Jiawen Zhou 1
Affiliation  

Seismicity sequence following a main earthquake usually contains much meaningful information for unveiling the focal mechanism and predicting the reoccurrence interval of large earthquakes. The spatiotemporal evolution of earthquakes before and after the 2008 Wenchuan earthquake (Ms 8.0) is analysed comprehensively in this study. The frequency-magnitude relation of the 3493 earthquake events retrieved from the database of the International Seismological Centre indicates that the adopted catalogue is complete for magnitudes ≥Ms 3.4. The seismicity during the 10 years before the Wenchuan earthquake remained stable, including the magnitudes and focal depths. However, seismicity attenuated sharply in the year following the Wenchuan earthquake, and the magnitude of earthquakes before the Wenchuan earthquake decreased gradually. The area of the seismogenic zone of the 2008 Wenchuan earthquake was smaller than the earthquake stricken area. The earthquakes that occurred in the Longmenshan fault area and adjacent area in the study period were mainly shallow earthquakes. The focal depths of earthquakes in the study area became stable gradually after the Wenchuan earthquake, mainly within the range from 10 to 16 km. The earthquakes in the study area were mainly distributed with an along-dip distance of 0–20 km, and the seismicity was distributed uniformly along the fault strike.

中文翻译:

2008年汶川地震前后龙门山断裂及邻区地震时空演变

主震后的地震序列通常包含许多有意义的信息,可以揭示震源机制和预测大地震的重现间隔。本研究综合分析了2008年汶川地震( M s 8.0)前后地震的时空演化规律。从国际地震中心数据库中检索到的3493次地震事件的频级关系表明,所采用的目录是完整的,震级≥ M s3.4. 汶川地震前10年的地震活动保持稳定,包括震级和震源深度。但汶川地震后一年地震活动急剧减弱,汶川地震前震级逐渐减弱。2008年汶川地震的发震区面积小于震区。研究期间龙门山断裂带及邻区发生的地震主要是浅层地震。汶川地震后,研究区地震震源深度逐渐趋于稳定,主要集中在10~16 km范围内。研究区地震主要沿倾角0~20 km分布,地震活动沿断层走向均匀分布。
更新日期:2021-11-24
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