Recurrence Characteristics of Major Earthquakes in the Tangshan area, North China
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This research was supported by grants from the National Key Technology Research and Development Program (2008BAK50B03-05) and the Key Program of Hebei Development and Reform Commission (HBYHT2007321F).


Recurrence Characteristics of Major Earthquakes in the Tangshan area, North China
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    摘要:

    The Tangshan area lies in the North China plain where an Ms 7.8 earthquake occurred in 1976, which is associated with a hidden active fault. To reveal the recurrence characteristics of major quakes in this area over a relatively long time, we have conducted a comprehensive study using geological investigations, shallow seismic exploration, boreholes, trench observations and geological dating. Five paleoearthquakes were recognized in a 6.4m-deep trench west to the Tangshan Asylum. Among them, the former three events occurred between 56.78?±?4.83ka and 89.39?±?7.60?ka, and the fourth event occurred around 6.9?ka, respectively, and then followed by the fifth in 1976. Seven boreholes were deployed crossing the ground fissure formed by the 1976 Tangshan earthquake at the site of No. 10 Middle School, where we have identified 25 liquefaction events in the boreholes TZC6–5 and 6–7. By the comprehensive analysis of the trench, the liquefaction events from the boreholes and the depth-time curves of drill cores, we suggest a new recurrence model of major quakes in this area. It is not a constant recurring cycle since 210?ka, instead consisting of six alternating seismically quiet and active stages. Of them, stage I (>177?ka) was a quiescent period in seismicity, stage II (from 143?ka to 177?ka) was an active one, stage III (from 102?ka to 143?ka) was quiescent again, stage IV (from 56?ka to 102?ka) had many quakes, stage V (from 6.9?ka to 56?ka) became quiet, and stage VI (from 6.9?ka to now) was the beginning of a new seismically active period.

    Abstract:

    The Tangshan area lies in the North China plain where an Ms 7.8 earthquake occurred in 1976, which is associated with a hidden active fault. To reveal the recurrence characteristics of major quakes in this area over a relatively long time, we have conducted a comprehensive study using geological investigations, shallow seismic exploration, boreholes, trench observations and geological dating. Five paleoearthquakes were recognized in a 6.4m-deep trench west to the Tangshan Asylum. Among them, the former three events occurred between 56.78?±?4.83ka and 89.39?±?7.60?ka, and the fourth event occurred around 6.9?ka, respectively, and then followed by the fifth in 1976. Seven boreholes were deployed crossing the ground fissure formed by the 1976 Tangshan earthquake at the site of No. 10 Middle School, where we have identified 25 liquefaction events in the boreholes TZC6–5 and 6–7. By the comprehensive analysis of the trench, the liquefaction events from the boreholes and the depth-time curves of drill cores, we suggest a new recurrence model of major quakes in this area. It is not a constant recurring cycle since 210?ka, instead consisting of six alternating seismically quiet and active stages. Of them, stage I (>177?ka) was a quiescent period in seismicity, stage II (from 143?ka to 177?ka) was an active one, stage III (from 102?ka to 143?ka) was quiescent again, stage IV (from 56?ka to 102?ka) had many quakes, stage V (from 6.9?ka to 56?ka) became quiet, and stage VI (from 6.9?ka to now) was the beginning of a new seismically active period.

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LIU Kang, QU Guosheng, CHEN Jianqiang, WANG Weiguo and NING Baokun.2013. Recurrence Characteristics of Major Earthquakes in the Tangshan area, North China[J]. ACTA GEOLOGICA SINICA(English edition),87(1):254~271

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  • 收稿日期:2011-12-13
  • 最后修改日期:2012-05-20
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