Journal of Jilin University(Earth Science Edition) ›› 2018, Vol. 48 ›› Issue (6): 1865-1875.doi: 10.13278/j.cnki.jjuese.20180161

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Earthquake Triggered by “Magma Bubble” Bursting: 2013 Songyuan Earthquake Cluaters in Jilin as an Example

Xue Linfu1, Zhu Ming1, Li Wenqing1, Liu Wenyu2, Liu Zhenghong1, Liu Zeyu1   

  1. 1. College of Earth Sciences, Jilin University, Changchun 130061, China;
    2. Wuhan Geological Survey Center, China Geological Survey, Wuhan 430205, China
  • Received:2018-06-22 Published:2018-11-26
  • Supported by:
    Supported by China Geological Survey (1212011220247)

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Abstract: An unusual M 5.5 earthquake occurred on October 31st, 2013 in Songyuan City(44.60°N, 124.18°E),Northeastern China, and about 700 shocks were recorded in the following 40 days (5 times earthquakes above M 5.0). In the Songyuan area, earthquake activities have been frequent in recent years. Since January 2014, there have been nine times earthquakes with magnitude above 4.0 and one time with magnitude above 5.0. The epicenter is located in the oil-gas exploration area of Songliao basin, and the seismic sequence is very special. In order to reveal the earthquake mechanism, earthquake model and the relationship between deep geological processes and earthquakes, the magnetotelluric (MT) depth sounder was used to record a NW-SE 25-km-long profile with 23 MT survey points across the epicenter. On the basis of the MT profile, geothermal gradient, gas-phase hydrocarbons yield, 3He/4He ratio, carbon isotope analyses of CO2 gas and the seismic sequence, two low-resistance bodies were recognized at different depths in the epicentral area. The earthquakes are related to the deep mantle magmatism. We propose a new model that the earthquakes are triggered by "magma bubble" bursting. A "magma bubble" is a magma body formed by gradual accumulation of melts at a certain depth below the surface and rises at a certain speed. Magma gathers into magma bubble near the brittle-ductile transition zone. The energy stores in the magma-bubbles, and the strain energy stores in the overlying strata. Earthquakes occur as a result of the sudden energy release from the magma bubble bursting and the consequent overlying strata fracturing. Deep reservoirs of mantle-derived CO2 can be formed as a result of such long-term seismic activity. This model can explain the occurrence mechanism of many intraplate and deep-seated earthquakes.

Key words: earthquake triggering model, “magma-bubble” bursting, mantle-derived CO2, magnetotelluric sounding, Songyuan

CLC Number: 

  • P631.4
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