sPn震相特征及在震源深度测定中的应用
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
通过理论地震图模拟,研究sPn震相特征,分析其影响因素。研究表明:sPn与Pn震相的初动极性关系在不同台站方位角呈现不同特点,基于sPn震相的深度定位方法更适合于中强地震。以2012年9月7日12时16分彝良M_S 5.6地震为例,利用南北地震带南段密集流动地震台阵的观测数据,采用波形互相关方法拾取Pn波走时,应用滑动时窗相关法识别sPn震相,通过sPn与Pn震相走时差,测定震源深度为9.6 km。
With modeling theoretical seismograms,we studied the characteristics of sPn phase and analyzed the factors that may affect the phase.The result showed that the polarity of sPn with different azimuth angle may be different,and the depth location method based on the sPn phase is more suitable for M 4.0—6.0 earthquakes.Taking the Yiliang M_s 5.6 ecent on September 7,2012 as an example,we obtained its focal depth is 9.6 km using the seismic waveforms recorded by the seismic array deployed in the southern section of the North-South seismic belt.The focal depth is determined from the arrival-time differences between sPn and Pn phase.The Pn waves are picked by the waveform cross-correlation method,and the sPn phases are identified by using the sliding-window correlation method.
引文
崇加军,倪四道,曾祥方.sPL.,一个近距离确定震源深度的震相[J].地球物理学报,2010,53(11):2 620—2 630.
    房明山,杜安陆,董孝平,等.用sPn震相测定近震震源深度[J].地震地磁观测与研究,1995,16(5):13—18.
    韩立波,蒋长胜,吴文波.2011年安庆M_S 4.8地震SmS震相观测与研究[J].地震学报,2012,34(4):451—462.
    韩立波,罗艳.深度震相sSmS特征及其在震源深度确定中的应用[J].中国地震,2012,28(2):121—132.
    洪星,叶雯燕,邵平荣,等.台湾海峡南部一次5.0级地震的sPn震相分析[J].地震地磁观测与研究,2006,27(1):26—31.
    黄媛,吴建平,张天中,等.汶川8.0级大地震及其余震序列重定位研究[J].中国科学D辑,2008,38(10):1 242—1 249.
    任克新,邹立晔,刘瑞丰,等.用sPn计算内蒙地震的震源深度[J].地震地磁观测与研究,2004,25(3):24—31.
    吴建平,黄媛,张天中,等.汶川M_S 8.0级地震余震分布及周边区域P波三维速度结构研究[J].地球物理学报,2009,52(2):320——328.
    熊绍柏,郑晔,尹周勋,等.丽江-攀枝花-者海地带二维地壳结构及其构造意义[J].地球物理学报,1993,36(4):434—443.
    张瑞青,吴庆举,李永华,等.汶川中强余震震源深度的确定及其意义[J].中国科学D辑,2008,38(10):1 234—1 241.
    张瑞青,吴庆举.四川攀枝花2008年8月31日M_S 5.6地震震源深度的确定[J].国际地震动态,2008(12):1—5.
    郑秀芬,欧阳飚,张东宁,等.“国家数字测震台网数据备份中心”技术系统建设及其对汶川大地震研究的数据支撑[J].地球物理学报,2009,52(5):1 412—1 417.
    Laurent G,Davidowitz H.Encoding of olfactory information with oscillating neural assemblies[J].Science,1994,265(5 180),1 872-1 875.
    Laurent G.Wehr M,Davidowitz H.Temporal representations of odors in an olfactory network[J],The journal of Neuroscience,1996,16(12),3 837-3 847.
    Ma S.Focal depth determination for moderate and small earthquakes by modeling regional depth phases sPg,sPmP,and sPn[J].Bulletin of the Seismological Society of America,2010,100(3),1 073-1 088.
    Saikia C K.Modeling of the 21 May 1997 Jabalpur earthquake in central India,Source parameters and regional path calibration[J].Bulletin of the Seismological Society of America,2006,96(4A),1 396—1 421.
    Waldhauser F,Ellsworth WL.A double-difference earthquake location algorithm.Method and application to the northernHayward fault,California[J].Bulletin of the Seismological Society of America,2000,90(6),1 353—1 368.
    Zhu L,Rivera L A.A note on the dynamic and static displacements from a point source in multilayered media[J].Geophysical Journal International,2002,148(3):619—627.

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