摘要
2003年8月16日内蒙古巴林左旗与阿鲁科尔沁旗间发生5 9级地震,使内蒙古东部地震活动再次进入活跃阶段。通过对巴林左旗-阿鲁科尔沁旗5 9级地震余震序列分析表明,序列的空间位置变化不太大,集中发生在较小的区域内,说明该震震源体较小。整个余震序列以NWW向条带分布为主,条带的走向与宏观烈度等值线长轴方向及震源机制B节面方向一致。ML≥3 0余震形成NW和NE两条相互垂直的条带,主震发生在NW条带的北西端。分析余震序列深度剖面图,说明NW向可能为此次地震的主破裂方向。
An earthquake of M_S5.9 on Aug.16, 2003 occurred between Balinzuoqi and Alukeerqinqi, it is turned into the earthquake activity stage in the Eastern area of Inner Mongolia again. Through analysing the earthquake sequence of M_S5.9 between Balinzuoqi and Alukerqinqi, it indicates that spatial location changed a little and the sequence occurred in small area and the focal volum was smaller.The sequence distribution appeared NWW direction belt,it's strike accord with the macro-axis direction of the macroscopic intensity isorithm and B modal plane direction of the focal mechanism solution.The aftershocks (M_L≥3.0) fomed NW and NE belt which meet at right angles.The main earthquake occurred at the west-north end on NW belt.The main fracture was probably along with NW direction.
出处
《东北地震研究》
2004年第4期22-27,共6页
Seismological Research of Northeast China
