利用小震重新定位结果研究河北文安地震前地震活动三维空间特征
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摘要
利用首都圈地区小震重新定位结果,研究了2006年7月4日河北文安5.1级地震前地震活动特征,结果表明:①文安地震前5年,河北平原带中段ML≥3.0地震活动出现明显的增强(持续43个月)—平静(持续17个月)特点,蠕变曲线表现为加速—转平;②震前4年,在15~20 km深处存在一个纬向长约70 km、经向长约90 km的三维空区,文安地震的起始破裂点位于该三维空区的下部边缘;③2003年4月~2004年10月,平原带中段ML≥2.0地震震源深度从10 km的浅处逐渐增加到30 km左右的深处,在此过程中,中下地壳(20~30 km深度范围内)地震活动显著增强。
Characteristics of seismic activity before the July 4,2006 earthquake of M5.1 in Wen′an,Hebei province were analyzed by relocation of small earthquakes in China′s capital area.Some results are obtained as below: ① The seismic activity of ML≥3.0 in the middle part of the Hebei plain seismic belt displayed a feature of strengthening(lasting 43 months)-quiescence(lasting 17 months) 5 years before the Wen′an earthquake.Simultaneously,the strain release curve showed a variation process of accelerating-flatting.② A seismogenic gap in three-dimensional space,located in the depth of 15~20 km,with 70 km long in latitude direction and 90 km long in longitude orientation,was formed by M≥2.0 earthquakes 4 years prior to the Wen′an earthquake.The initial rupture point of the Wen′an earthquake situated at the bottom of the gap.③ The focal depths of ML≥2.0 earthquakes in the middle part of the Hebei plain seismic belt gradually deepened from 10 km to 30 km from April,2003 to October,2004.Meanwhile the seismic activity obviously strengthened in the middle and lower crust(from 20 km to 30 km in depth).
Characteristics of seismic activity before the July 4,2006 earthquake of M5.1 in Wen′an,Hebei province were analyzed by relocation of small earthquakes in China′s capital area.Some results are obtained as below: ① The seismic activity of ML≥3.0 in the middle part of the Hebei plain seismic belt displayed a feature of strengthening(lasting 43 months)-quiescence(lasting 17 months) 5 years before the Wen′an earthquake.Simultaneously,the strain release curve showed a variation process of accelerating-flatting.② A seismogenic gap in three-dimensional space,located in the depth of 15~20 km,with 70 km long in latitude direction and 90 km long in longitude orientation,was formed by M≥2.0 earthquakes 4 years prior to the Wen′an earthquake.The initial rupture point of the Wen′an earthquake situated at the bottom of the gap.③ The focal depths of ML≥2.0 earthquakes in the middle part of the Hebei plain seismic belt gradually deepened from 10 km to 30 km from April,2003 to October,2004.Meanwhile the seismic activity obviously strengthened in the middle and lower crust(from 20 km to 30 km in depth).
引文
[1]刁桂苓,张四昌,孙佩卿,等.2006年7月4日文安5.1级地震[J].地震地质,2006,28(3):497-502.
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[3]黄建平,倪四道,傅容珊,钮凤林,邵志刚,郑勇.综合近震及远震波形反演2006文安地震(MW5.1)的震源机制解[J].地球物理学报,2009,52(1):120-130.
[4]焦青,范国胜.河北文安地震前后首都圈跨断层位移的变化特征[J].大地测量与地球动力学,2007,27(6):17-21.
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[6]康春丽,王亚丽,刘德富.文安地震前华北区域长波辐射场的异常特征分析[J].2007,地震,27(3):83-88.
[7]王琳瑛,郭永霞,刘芳,蒋长胜.文安地震前后首都圈分区波速比时变特征[J].地震学报,2008,30(3):240-253.
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[20]刘蒲雄.强震前地震活动增强特征[J].地震,1982,2(2):5-7.
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[22]Mogi K.Relationship between shallow and deep seismicity in the western Pacific region[J].Tec-tonophysics,1973,17:1-22.
[23]Mogi K.Recent seismic activity in the Tokai(Japan)region where a large earthquake is expected inthe near future[J].Tectonophysics,1987,138:255-268.
[24]薛艳,宋治平,梅世蓉,等.印尼苏门答腊几次大地震前的地震活动异常特征[J].地震学报,2008,30(3):321-325.
[25]嘉世旭,张先康.华北不同构造块体地壳结构及其对比研究[J].地球物理学报,2005,48(3):672-683.
[26]张国民,李丽.地壳介质的流变性与孕震模型[J].地震地质,2003,25(1),1-10.
[27]沧州市地震局,廊坊市地震局.一九六七年河间一大城地震[M].北京:地震出版社,2001.
[2]张晶,江在森,方颖,王武星.文安地震与首都圈地区数字化应变资料分析[J].地震,2007,27(1):39-46.
[3]黄建平,倪四道,傅容珊,钮凤林,邵志刚,郑勇.综合近震及远震波形反演2006文安地震(MW5.1)的震源机制解[J].地球物理学报,2009,52(1):120-130.
[4]焦青,范国胜.河北文安地震前后首都圈跨断层位移的变化特征[J].大地测量与地球动力学,2007,27(6):17-21.
[5]孙铭心,刘善华,杨怀宁.河北文安5.1级地震前的重力变化[J].大地测量与地球动力学,2008,28(2):16-21.
[6]康春丽,王亚丽,刘德富.文安地震前华北区域长波辐射场的异常特征分析[J].2007,地震,27(3):83-88.
[7]王琳瑛,郭永霞,刘芳,蒋长胜.文安地震前后首都圈分区波速比时变特征[J].地震学报,2008,30(3):240-253.
[8]Working Group on California Earthquake Probabilities.Probabilities of Large Earthquakes inthe SanFrancisco Bay Region,California[R].US Geol Surv Cire 1053,1990,1-51.
[9]薛艳,马宏生,周龙泉.2003年云南大姚地震前的地震活动特征研究[C].地震预报探索[M].北京:地震出版社,2008,313-320.
[10]国家地震局震害防御司.中国历史强震目录(公元前23世纪—1911年)[J].北京:地震出版社,1995.
[11]中国地震局震害防御司.中国近代地震目录(公元1912年—1990年MS≥4.7).北京:中国科学技术出版社,1999.
[12]齐诚,赵大鹏,陈颙,等.首都圈地区地壳P波和S波三维速度结构及其与大地震的关系[J].地球物理学报,2006,49(3):805-815.
[13]Chen H,Chiu J M,Pujol J,et al.Asi mple algorithmfor local earthquake location using 3D VPandVSmodels:Test exampleinthe central United States andin central eastern Tai wan[J].Bull SeismolSoc Am,2006,96:288-305.
[14]Aki K,Richards P G.Quantitative Seismology[M].Vol.2.San Francisco:Freeman.1980.
[15]徐杰,牛娈芳,王春华,等.唐山-河间-磁县新生地震带[J].地震地质,1996,18(3):193-198.
[16]李祥根.京津及河北平原的最新活动构造带.中国地震学地震地质专业委员会编《中国活动断裂》[M].北京:地震出版社,1982.44-50.
[17]杨理华.邢台-河间-唐山强震带是地震构造破裂带[J].中国地震,1987,3(4):61-66.
[18]徐锡伟,吴卫民,张先康,等.首都圈地区地壳最新构造变动与地震[M].北京:地震出版社,2002.15-16.
[19]Gutenberg B and C F Richter.Earthquake magnitude,intensity,energy and acceleration(second pa-per)[J].Bull Seismol Soc Am,1956,46:105-145.
[20]刘蒲雄.强震前地震活动增强特征[J].地震,1982,2(2):5-7.
[21]王炜,黄冰树,陆远忠,等.孕震空区方法在地震预报中的应用及其效能的研究[J].地震预报方法实用化研究文集——地震学专集[M].北京:地震出版社,1989.1-24.
[22]Mogi K.Relationship between shallow and deep seismicity in the western Pacific region[J].Tec-tonophysics,1973,17:1-22.
[23]Mogi K.Recent seismic activity in the Tokai(Japan)region where a large earthquake is expected inthe near future[J].Tectonophysics,1987,138:255-268.
[24]薛艳,宋治平,梅世蓉,等.印尼苏门答腊几次大地震前的地震活动异常特征[J].地震学报,2008,30(3):321-325.
[25]嘉世旭,张先康.华北不同构造块体地壳结构及其对比研究[J].地球物理学报,2005,48(3):672-683.
[26]张国民,李丽.地壳介质的流变性与孕震模型[J].地震地质,2003,25(1),1-10.
[27]沧州市地震局,廊坊市地震局.一九六七年河间一大城地震[M].北京:地震出版社,2001.
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