华南地区地震活动特征与台湾强震影响  

Research on the seismic activity features and influence from Taiwan strong earth- quake in South China

作　　者：顾瑾萍[1] 吕培苓[1] 彭美凤[2] 康春丽[1] 张凌空[1] 

机构地区：[1]中国地震局分析预报中心,北京100036 [2]福建省地震局,福建福州350003

出　　处：《地震》2004年第1期55-59,共5页Earthquake

基　　金：中国地震局分析预报中心"我国华东华南震情跟踪方案"(2003 55)资助

摘　　要：以MS5.5以上地震是否发生为标记,划分华南地区的活跃和平静时段,结果显示与华南地区2级以上地震频次的应力调制时间过程变化趋势有很好的一致性。另外,在活跃和平静时段华南地区的震级频次特点显著不同。华南地区在中强震发生前有4级左右地震频繁活动和小震群频发的特点。华南地区的中强震与云南地区7级地震的发生相关。统计20世纪以来台湾强震与华南中强震的对应关系,台湾西带6级强震后1年内华南中强震的对应率近0.5,地区影响似有由东至西逐渐减弱的趋势。台湾7级地震后2年内华南中强震的对应率只有0.3,对应地区除台湾海峡、福建和广东东部地震外,也有几次对应广西和北部湾地区的地震,与6级相比,台湾7级强震影响范围大。Taking the phenomenon whether the earthquakes with M≥5.5 occur or not as the sign, the seismically active and quiet periods can be divided in the South China region. The research results show well the consistency with the time change trend of stress modulation of seismic frequency (≥M_L 2.0). Besides, the features of seismic frequency during the active and quiet periods are obviously different. Before the moderately strong earthquakes in the region there are frequent seismic activity with magnitude of 4 or so and small earthquake swarms. The moderately strong earthquakes in South China region are related to occurrence of earthquakes with magnitude of 7 or so in Yunnan region. According to the statistical corresponding relation between seismicity in Taiwan and South China regions since 20^(th) century, it is found that the corresponding rate of moderately strong earthquakes in South China to the earthquakes with magnitude of 6 or so in western Taiwan occurred in one year is 0.5; and the corresponding rate of moderately strong earthquakes in South China to the earthquake with magnitude of 7 or so in two years is 0.3. The corresponding regions include Taiwan straight, Fujian Province and eastern Guangdong areas, and Guangxi and Beibu Bay areas are also involved. Compared with M_S 6 earthquakes, the Taiwan M_S 7 earthquakes show larger effected range.

关 键 词：地震活动 地震频次 地震应力 地震统计 华南地区 

分 类 号：P315.5[天文地球—地震学]