Abstract Using the latest method developed by Snoke for calculating focal mechanism solutions using the combination of P wave, SV wave and SH wave (FOCMEC), we inversed the focal mechanism solutions of 176 ML≥1.0 earthquakes of two times after Jiujiang-Ruichang MS5.7 earthquake. The results show that the seismogenic fault of the mainshock MS5.7 is a sinistral strike slip fault with thrust property under the extrusion of the near EW direction stress field, with most aftershocks presenting a strike slip motion. The NW Yangjishan-Wushan-Tongjiangling buried fault forms the seismogenic structure of the main shock. The predominant strike direction of nodal planes are NEE and NWW, which is largely consistent with the predominant direction of aftershock distributions and tectonic strikes. The dominant direction of the P axis of focal mechanism solutions is nearly EW, close to the direction of P axis the main shock. It is also consistent with the distribution of tectonic stress field in northern Jiangxi. The inversion results of the whole stress field are consistent with the statistical results of the focal mechanism parameters, which show the effect of the near EW direction extrusion and the near NS tension.
TANG Lanrong,Lv Jian,ZENG Xinfu et al. Characteristics of Focal Mechanisms and Stress Field in the Border Region of Jiujiang and Ruichang[J]. jgg, 2018, 38(8): 791-795.
TANG Lanrong,Lv Jian,ZENG Xinfu et al. Characteristics of Focal Mechanisms and Stress Field in the Border Region of Jiujiang and Ruichang[J]. jgg, 2018, 38(8): 791-795.