SEISMOLOGY AND GEOLOGY ›› 2004, Vol. 26 ›› Issue (1): 122-132.

• Brief Report • Previous Articles     Next Articles

THE FEATURE OF SEISMICITY IN NORTHEAST CHINA AND ITS RELATION TO THE SUBDUCTION OF THE JAPAN SEA PLATE

SUN Wen-bin1, HE Yue-shi2   

  1. 1. Earthquake Administration of Heilongjiang Province, Harbin 150090, China;
    2. Mudanjiang Seismic Station, Mudanjiang 157009, China
  • Received:2002-12-30 Revised:2003-08-17 Online:2004-03-04 Published:2009-10-26

中国东北地区地震活动特征及其与日本海板块俯冲的关系

孙文斌1, 和跃时2   

  1. 1. 黑龙江省地震局, 哈尔滨, 150090;
    2. 牡丹江地震台, 牡丹江, 157009
  • 作者简介:孙文斌,男,1949年生,高级工程师,1975年在长春地质学院毕业,主要从事地震学、俯冲带、地震预报等方面的研究,电话:0451-82645302,E-mail:sunwenb@0451.com.
  • 基金资助:
    地震科学联合基金(100156)资助.

Abstract: Based on the analyses of grouped activities of deep-focus (mb≥6.0) and shallow-focus (Ms≥5.0) earthquakes in Northeast China, the spatial and temporal correlation between the deep-focus "strong earthquake group" and shallow-focus "strong earthquake group" was studied. The study was focused mainly on the characteristics of earthquake distribution along the collision zone between the west Pacific plate and Eurasian plate, as well as its relation to the form of the west Pacific subduction zone. Moreover, emphasis was also laid on the analyses of the effect of the west Pacific plate on the seismicity in Eurasian plate. The results show that in the region where the west Pacific plate subducts at low angle, the seismicity along the plate collision zone is very strong, and the effect of plate subduction on the seismicity in Eurasian continent is most significant. In this condition, the subduction zone is subjected to relatively strong compressive stress. However, in the region where the west Pacific plate subducts at high angle, the seismicity along the plate collision zone becomes weaker, and the effect of plate subduction to the seismic activity in Eurasian continent becomes less significant. In this condition, the tensile stress produced by the subduction zone at depth is enhanced. We propose, therefore, that the seismic activity of Northeast China will enter the active period of shallow "strong earthquake group" in forthcoming 10 years. In this period, 6 earthquakes of Ms≥5.0 may occur in this region. It is emphasized that the monitoring and prediction of seismic activity in Northeast China should be enhanced.

Key words: strong earthquake group, west Pacific plate, earthquake trend, Northeast China

摘要: 分析中国东北地区深震(mb≥6.0)及浅震(Ms≥5.0)的成组性活动特征,研究了深震"强震组"与浅震"强震组"的时、空相关性.着重探讨了西太平洋板块与欧亚板块碰撞带的地震分布特征及其与西太平洋俯冲带形态的关系,并着重分析了西太平洋板块对欧亚板块地震活动的影响.结果表明:西太平洋板块俯冲倾角小的地区,板块碰撞带地震活动强烈,板块俯冲对欧亚大陆的影响也较强,俯冲带处于较强的挤压应力状态;西太平洋板块俯冲倾角大的地区,板块碰撞带地震活动较弱,板块俯冲对欧亚大陆的影响也较弱,深部俯冲带引张应力增强.分析认为,未来10年中国东北地区将进入浅震"强震组"活动时段,期间可能发生Ms≥5.0地震6次左右,应加强东北地区的地震监测预报工作.

关键词: 强震组, 西太平洋板块, 地震趋势, 中国东北地区

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