CAJ | 학술논문

根据福建数字地震台网记录的地震震源深度资料,统计分析了1998年7月至2008年6月期间福建及邻区M_L≥1.0并有震源深度参数且观测精度为1类地震1 431次. 采用0.4°×0.4°网格和以0.2°为滑动步长, 统计了网格内地震的平均深度, 并绘制了平均深度等值线图. 分析结果表明: ① 福建地区地震震源深度总体上呈现东南深、西北浅的特征, 东南沿海地区平均震源深度大于14 km, 西北地区平均震源深度小于10 km; ② 平均震源深度等值线展布大致呈NE向, 在福建南部地区平均震源深度在沿NE向展布基础上, 还受到NW向断裂控制, 断裂构造通过的地区平均震源深度相对较深; ③ 福建地区地震动力成因与中国大陆其他地区有所不同.
근거복건수자지진태망기록적지진진원심도자료,통계분석료1998년7월지2008년6월기간복건급린구M_L≥1.0병유진원심도삼수차관측정도위1류지진1 431차. 채용0.4°×0.4°망격화이0.2°위활동보장, 통계료망격내지진적평균심도, 병회제료평균심도등치선도. 분석결과표명: ① 복건지구지진진원심도총체상정현동남심、 서북천적특정, 동남연해지구평균진원심도대우14 km, 서북지구평균진원심도소우10 km; ② 평균진원심도등치선전포대치정NE향, 재복건남부지구평균진원심도재연NE향전포기출상, 환수도NW향단렬공제, 단렬구조통과적지구평균진원심도상대교심; ③ 복건지구지진동력성인여중국대륙기타지구유소불동.
Based on focal depth data of Fujian digital seismic network, we analyzed 1 431 M_L≥1.0 earthquakes with focal depth and first class observation accuracy occurred in Fujian province and vicinities from July 1998 to June 2008. With the meshes of 0.4°×0.4°and the sliding step of 0.2°, the average focal depth in every mesh was calculated, and contour map of average focal depth was plotted. The results can be summarized as follows: ① The characteristics of focal depths in the region is deeper in the southeast than in the northwest. The average focal depth is more than 14 km in the southeast costal region and less than 10 km in the northwestern region(Nanpin City area); ② The isolines are mainly in NE direction. The focal depth is controlled by NW-trending structure and relatively deep in fault structure areas in the southern; ③ The earthquake dynamic cause in Fujian region may be different from the other parts of the China continent.