傅煜铭, 江国明, 魏衍雯, 周智文, 马潇. 2016: 日本东北地区双震带高精度重定位研究. 地震学报, 38(1): 59-70. DOI: 10.11939/jass.2016.01.006
引用本文: 傅煜铭, 江国明, 魏衍雯, 周智文, 马潇. 2016: 日本东北地区双震带高精度重定位研究. 地震学报, 38(1): 59-70. DOI: 10.11939/jass.2016.01.006
Fu Yuming, Jiang Guoming, Wei Yanwen, Zhou Zhiwen, Ma Xiao. 2016: Precise earthquake relocation of double seismic zone beneath Tohoku region in Japan. Acta Seismologica Sinica, 38(1): 59-70. DOI: 10.11939/jass.2016.01.006
Citation: Fu Yuming, Jiang Guoming, Wei Yanwen, Zhou Zhiwen, Ma Xiao. 2016: Precise earthquake relocation of double seismic zone beneath Tohoku region in Japan. Acta Seismologica Sinica, 38(1): 59-70. DOI: 10.11939/jass.2016.01.006

日本东北地区双震带高精度重定位研究

Precise earthquake relocation of double seismic zone beneath Tohoku region in Japan

  • 摘要: 日本所在的西太平洋地区是世界上中深源地震发生最为频繁的地区. 早期研究已表明, 日本东北地区下方的中深源地震呈双层分布. 为进一步分析该双震带的空间分布特征, 本文通过方法测试证明了采用球坐标系下的三维射线追踪法改进后的双差定位法进行地震重定位的精确性和有效性, 对使用该方法进行重定位前、 后各方向上的误差进行了分析, 并确定了最佳的定位参数. 在此基础上, 对日本东北地区的中深源地震进行了高精度重定位, 并对重定位得到的震源位置进行了空间拟合, 其结果表明地震呈明显的双层分布, 且与西太平洋俯冲板块几近平行. 本文研究结果对揭示双震带中地震的发震机理以及俯冲板块内的精细结构均具有重要意义.

     

    Abstract: Japan is located in western Pacific, where the intermediate-deep earthquakes occur frequently. Early researches indicate that the intermediate-deep earthquakes beneath Tohoku region in Japan constitute a double seismic zone. In order to analyze the spatial distribution characteristics of the double seismic zone in Tohoku region, we use a method test to show the precision and validity of the double-difference location algorithm, which has been improved by 3-D ray tracing method in spherical coordinate system. We analyse the errors before and after relocation along different directions, and determine the most suitable parameters for relocation. Then we obtain the precise relocated earthquakes in the double seismic zone beneath Tohoku region, and fit the relocated hypocenters in three-dimensional space. The relocation results of intermediate-deep earthquakes in Tohoku region indicate that the earthquakes in the seismic zone are distributed obviously in double layers, which are approximately parallel to the subducting western Pacific Plate. The results of this paper are significant to reveal the mechanisms of earthquakes in double seismic zone and the fine structures in the deep subduction zones.

     

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