CAJ | 학술논문

利用双差定位法对阳江地区2004年1月-2007年5月M_L≥1.5地震记录重新进行定位,结果显示,2004年9月17日阳江平冈4.9级地震前,阳江地区出现了北北西向及北西向两条M_L≥2.0地震条带,其中北北西向条带与4.9级地震的震源机制解节面Ⅱ及断层破裂方位角方向一致,且在震前1月北北西向条带上的地震出现震源深度加深现象,4.9级地震发生在条带的东南端.
이용쌍차정위법대양강지구2004년1월-2007년5월M_L≥1.5지진기록중신진행정위,결과현시,2004년9월17일양강평강4.9급지진전,양강지구출현료북북서향급북서향량조M_L≥2.0지진조대,기중북북서향조대여4.9급지진적진원궤제해절면Ⅱ급단층파렬방위각방향일치,차재진전1월북북서향조대상적지진출현진원심도가심현상,4.9급지진발생재조대적동남단.
The Yangjiang earthquake sequences from January, 2004 to May,2007 were relocated with the double-difference location algorithm. The results show that two M_L≥2.0 seismicity belts distributed in Yangjiang area before Yangjiang M4.9 earthquake occurred on 17th September, 2004, the direction of one belt was NNW and the other was NW. The direction of NNW M_L≥2.0 seismicity belt was consistent with the direction of nodal plane Ⅱ of focal mechanism and the focal rupture azimuth. The focal depth of NNW seismicity belt deepened gradually in one month before the M4.9 earthquake and it occurred at the southeast edge of NNW seismicity belt.