沂沭断裂带及附近地区分段平均波速比研究
|
摘要
以山东省数字地震台网产出的观测报告为基础,将沂沭断裂带及附近地区划分成4个子区域,利用多台和达法分别计算出了2002年1月至2012年4月各个子区域内中小地震平均波速比,并对其时空分布特征进行了比较。结果表明:(1)郯城—高桥段、莱州湾及附近海域平均波速比略低于孟疃—潍坊段和新沂—宿迁段,沂沭带主干断裂波速比基本分布在1.69～1.73之间,胶东半岛北部海域(120.5°E以东区域)波速比明显偏低,最低值为1.63;(2)研究区中小地震震源深度与其波速比没有明显相依关系,震源深度优势分布范围为5～20km,反映了研究区中、上地壳介质的横向不均匀性;(3)波速比计算中,台站数目越多波速比计算误差越小,合适的空间范围的划分能更真实反映介质的变化。
Basing on the observation report of Shandong Provinc Digital Seismic Network from Jan. ,2002 to Apr. , 2012,we calculated the average wave velocity ration and compared temporal and spatial distribution characteristics in Yishu fault zone and its adjacent areas which was divided into 4 sub-region according to multi-station method. The results show that: (1) Average wave velocity ratio of the Tancheng-Gaoqiao and Laizhou bay and their adjacent sea area are slightly lower than those of Mengtong-Weifang and Xinyi-Suqian. The velocity ratio values in Yishu main fault are between 1. 69 and 1. 73. However it is significantly lower in the northern part of Jiaodong peninsula,and the minimum value is 1.65. (2) The focal depth of moderate and small earthquakes in study area have no obvious dependence with the velocity ratio,and the advantage distribution range of focal depth is from 5km to 20 km,which reflects there is lateral heterogeneity in the middle and upper crust. (3) In the velocity ratio calculation,the more of the number of stations,the smaller of the calculation error of wave ve-locity ratio,and the suitable division of the space range could more realistically reflect the changes of the media.
Basing on the observation report of Shandong Provinc Digital Seismic Network from Jan. ,2002 to Apr. , 2012,we calculated the average wave velocity ration and compared temporal and spatial distribution characteristics in Yishu fault zone and its adjacent areas which was divided into 4 sub-region according to multi-station method. The results show that: (1) Average wave velocity ratio of the Tancheng-Gaoqiao and Laizhou bay and their adjacent sea area are slightly lower than those of Mengtong-Weifang and Xinyi-Suqian. The velocity ratio values in Yishu main fault are between 1. 69 and 1. 73. However it is significantly lower in the northern part of Jiaodong peninsula,and the minimum value is 1.65. (2) The focal depth of moderate and small earthquakes in study area have no obvious dependence with the velocity ratio,and the advantage distribution range of focal depth is from 5km to 20 km,which reflects there is lateral heterogeneity in the middle and upper crust. (3) In the velocity ratio calculation,the more of the number of stations,the smaller of the calculation error of wave ve-locity ratio,and the suitable division of the space range could more realistically reflect the changes of the media.
引文
蔡静观.2000.波速比计算中得不确定因素和在地震预报中得应用[J].地震研究,23(1):51-56.
冯德益.1981.地震波速异常[M].北京:地震出版社,21-23,36-37.
傅征祥,程燕.1988.北京和张家口地区地壳平均波速比的联合测定[J].地震,8(4):28-34.
嘉世旭,刘昌铨.1996.邢台震源区波速比异常与地震的关系[J].地震学报,39(增刊):205-215.
黎明晓,张晓东.2004.应用多台法测定华北地区地壳的平均波速比[J].地震,24(1):163-169.
李永莉,毛慧玲,赵小燕.2008.云南地区数字地震波波速比的区域特征[J].地震研究,31(3):203-208.
李志伟,胥颐,郝天珧.2006.环渤海地区的地震层析成像与地壳上地幔结构[J].地球物理学报,49(3):797-804.
卢造勋,蒋秀琴,白云.1999.胶辽渤海地区地壳上地幔结构特征与介质的横向非均匀性[J].华北地震科学,2(2):43-51.
陆远忠,陈章立.1985.地震预报的地震学方法[M].北京:地震出版社.
满洪敏.2005.沂沭断裂带内部的差异活动及成因分析[J].华北地震科学,23(3):13-21.
梅世蓉,冯德益,张国民,等.1993.中国地震预报概论[M].北京:地震出版社,78-80.
粟生平,傅征祥.1996.华北地区地震带分段波速比平均值的测定[J].地震,16(2):114-120.
王志才,石荣会,晁洪太.2001.鲁中南隆起区第四纪晚期断裂活动特征[J].海洋地质与第四纪地质,21(4):95-103.
魏光兴,周翠英,胡政,等.1988.沂沭断裂带现代构造应力场和震源错动性质[J].中国地震,4(3):96-106.
张小涛,吕坚,马广庆,等.2006.九江—瑞昌地震序列的波速比特征研究[J].华北地震科学,24(4):21-29.
张学民,张天中,李永红,等.2007.山东地区多台波速比值研究[J].地震地质,29(1):95-104.
张碧秀,汤永安.1988.沂沐断裂带地壳结构特征[J].中国地震,4(3):16-22.
赵明淳,刁桂苓,张学民.2005.首都圈平均波速比分析[J].西北地震学报,27(3):246-254.
赵志新,徐纪人,许志琴.2004.上地幔三维s波速度结构与大别苏鲁超高压变质带俯冲折返机制探讨[J].岩石学报,20(1):l57-l64.
Niu F,Silvre P G,Daley T M,et al.2008.Preseismic velocity changes ob-served from active source monitoring at the Parkfield SAFOD drillsite[J].Nature,454(7201):204-209.
Wadati K.1928.Shallow and deep earthquake[J].Geophysical Maga-zine,1:162-202.
冯德益.1981.地震波速异常[M].北京:地震出版社,21-23,36-37.
傅征祥,程燕.1988.北京和张家口地区地壳平均波速比的联合测定[J].地震,8(4):28-34.
嘉世旭,刘昌铨.1996.邢台震源区波速比异常与地震的关系[J].地震学报,39(增刊):205-215.
黎明晓,张晓东.2004.应用多台法测定华北地区地壳的平均波速比[J].地震,24(1):163-169.
李永莉,毛慧玲,赵小燕.2008.云南地区数字地震波波速比的区域特征[J].地震研究,31(3):203-208.
李志伟,胥颐,郝天珧.2006.环渤海地区的地震层析成像与地壳上地幔结构[J].地球物理学报,49(3):797-804.
卢造勋,蒋秀琴,白云.1999.胶辽渤海地区地壳上地幔结构特征与介质的横向非均匀性[J].华北地震科学,2(2):43-51.
陆远忠,陈章立.1985.地震预报的地震学方法[M].北京:地震出版社.
满洪敏.2005.沂沭断裂带内部的差异活动及成因分析[J].华北地震科学,23(3):13-21.
梅世蓉,冯德益,张国民,等.1993.中国地震预报概论[M].北京:地震出版社,78-80.
粟生平,傅征祥.1996.华北地区地震带分段波速比平均值的测定[J].地震,16(2):114-120.
王志才,石荣会,晁洪太.2001.鲁中南隆起区第四纪晚期断裂活动特征[J].海洋地质与第四纪地质,21(4):95-103.
魏光兴,周翠英,胡政,等.1988.沂沭断裂带现代构造应力场和震源错动性质[J].中国地震,4(3):96-106.
张小涛,吕坚,马广庆,等.2006.九江—瑞昌地震序列的波速比特征研究[J].华北地震科学,24(4):21-29.
张学民,张天中,李永红,等.2007.山东地区多台波速比值研究[J].地震地质,29(1):95-104.
张碧秀,汤永安.1988.沂沐断裂带地壳结构特征[J].中国地震,4(3):16-22.
赵明淳,刁桂苓,张学民.2005.首都圈平均波速比分析[J].西北地震学报,27(3):246-254.
赵志新,徐纪人,许志琴.2004.上地幔三维s波速度结构与大别苏鲁超高压变质带俯冲折返机制探讨[J].岩石学报,20(1):l57-l64.
Niu F,Silvre P G,Daley T M,et al.2008.Preseismic velocity changes ob-served from active source monitoring at the Parkfield SAFOD drillsite[J].Nature,454(7201):204-209.
Wadati K.1928.Shallow and deep earthquake[J].Geophysical Maga-zine,1:162-202.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心