汶川震前几种低频事件波形分析
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摘要
列举分析了国外文献所记载的几类低频事件.选择汶川MS8.0地震主断层附近四川省部分台网宽频带数据,采用相应频段,进行带通滤波处理,检测到4种类似的低频事件波形.分别为低频震颤与滑移事件(ETS事件),深低频地震事件(LFE事件),深低频震动事件(DLF事件),以及超低频震动事件(VLF事件).定位分析实例证实,汶川震前的ETS和DLF等低频事件发生在主断层附近,表明大震发生之前龙门山断裂带附近有低频事件发生,主要为ETS和VLF两类事件及少量DLF事件.因有远震记录与LFE事件时间相近,无法确认此类事件是否存在.低频事件作为天然地震目录的补充,可为大震前兆和触发机理研究提供新的探索方向.
This paper lists and analyzes a few kinds of low frequency events studied in foreign literature.By choosing broadband records at stations of Sichuan digital seismic network near main fault of the Wenchuan earthquake and band filtering these datum,we detected four similar low frequency events,i.e.,episodic tremor and slip events(ETS),low frequency events(LFE),deep low frequency events(DLF) and very low frequency events(VLF).Located examples confirm that several low frequency events occurred near the Longmenshan fault,most of them are ETS and VLF and minority is DLF.We can not verify whether LFE events actually exist or not,because there are distant earthquakes at the same time.As a supplement to traditional earthquake catalog,low frequency events may provide us a new research line for exploring possible precursors and triggering mechanism of strong earthquakes.
引文
彭汉书,吴忠良,蒋长胜.2008.数字地震台网中的深低频脉动观测?[J].中国地震,24(3):207-215.
    国家重大科学工程“中国地壳运动观测网络”项目组.2008.GPS测定的2008年汶川MS8.0级地震的同震位移场[J].中国科学:D辑,38(10):1195-1206.
    胡小刚,郝晓光.2008.汶川大地震宽带地震仪短临异常及成因初探[J].地球物理学报,51(6):1726-1734.
    胡小刚,郝晓光,薛秀秀.2010.汶川大地震前非台风扰动现象的研究[J].地球物理学报,53(12):2875-2886.
    王阎昭,沈正康.2007.慢滑移及相关脉动和慢地震研究的历史和现状[J].中国地震,23(1):1-9.
    吴忠良.2004.寂静地震与地震预测的物理问题[J].物理,33(11):796-800.
    Bormann P(著).2002.中国地震局监测预报司(译).2006.新地震观测实践手册[M].第一版.北京:地震出版社:1-1252.
    Beroza G,Jordan T.1990.Searching for slow and silent earthquakes using free oscillations[J].J Geophys Res,95(B3):2485-2510.
    Brudzinski M R,Allen R M.2007.Segmentation in episodic tremor and slip all along Cascadia[J].Geology,35(10):907-910.
    Ghosh A,Vidale J E,Sweet J R,Creager K C,Wech A G.2009.Tremor patches in Cascadia revealed by seismic arrayanalysis[J].Geophys Res Lett,36,L17316,doi:10.1029/2009GL039080.
    Hubbard J,Shaw J H.2009.Uplift of the Longmen shan and Tibetan plateau,and the2008Wenchuan(M=7.9)earth-quake[J].Nature,458(7235):194-197.
    Ide S,Beroza G C,Shelly D R,Uchide T.2007.A scaling law for slow earthquakes[J].Nature,447(7140):76-79.
    Ito Y,Obara K.2006.Very low frequency earthquakes within accretionary prisms are very low stress-drop earthquakes[J].Geophys Res Lett,33:L09302,doi:10.1029/2006GL025883.
    Kao H,Thompson P J,Rogers C,Dragert H,Spence G.2007.Automatic detection and characterization of seismic trem-ors in northern Cascadia[J].Geophys Res Lett,34:L16313,doi:10.1029/2007GL030822.
    Kanamori H.2008.Earthquake physics and real-time seismology[J].Nature,451(7176):271-273.
    Matsubara M,Obara K,Kasahara K.2009.High-vP/vSzone accompanying non-volcanic tremors and slow-slip eventsbeneath southwestern Japan[J].Tectonophysics,472(1-4):6-17.
    Matsuzawa T,Obara K,Maeda T.2009.Source duration of deep very low frequency earthquakes in western Shikoku,Japan[J].J Geophys Res,114:B00A11,doi:10.1029/2008JB006044.
    Miyazawa M,Brodsky E E.2008.Deep low-frequency tremor that correlates with passing surface waves[J].J GeophysRes,113:B01307,doi:10.1029/2006JB004890.
    Miyazawa M,Mori J.2006.Evidence suggesting fluid flow beneath Japan due to periodic seismic triggering from the2004Sumatra-Andaman earthquake[J].Geophys Res Lett,33:L05303,doi:10.1029/2005GL025087.
    Obara K,Hirose H.2006.Non-volcanic deep low-frequency tremors accompanying slow slips in the southwest Japan sub-duction zone[J].Tectonophysics,417:33-51.
    Ohmi S,Obara K.2002.Deep low-frequency earthquakes beneath the focal region of the MW6.72000Western Tottoriearthquake[J].Geophys Res Lett,16(29):1807-1818.
    Payero J S,Kostoglodov V,Shapiro N,Mikumo T,Iglesias A,Perez-Campos X,Clayton R W.2008.Nonvolcanictremor observed in the Mexican subduction zone[J].Geophys Res Lett,35(7):L07305,doi:10.1029/2007GL032877.
    Rocca M L,Galluzzo D,Malone S,McCausland W,Saccorotti G,Pezzo E D.2008.Testing small-aperture array analysison well-located earthquakes,and application to the location of deep tremor[J].Bull Seis Soc Amer,98(2):620-635.
    Rogers G,Dragert H.2003.Episodic low-frequency and slip on the Cascadia subduction zone:The chatter of silent slip [J].Science,300(5627):1942-1943.
    Sacks I S,Suyehiro S A,Linde T,Snoke J A.1978.Slow earthquakes and stress redistribution[J].Nature,275(19):599-602.
    Schwartz S Y,Rokosky J M.2007.Slow slip events and seismic tremor at circum-pacific subduction zones[J].Rev Geop,45(3):RG3004,doi:10.1029/2006RG000208.
    Shelly D,Beroza1GC,Ide S.2007.Non-volcanic tremor and low-frequency earthquake swarms[J].Nature,446(15):299-312.
    Shipley T H,Moore G F,Bangs N L,Moore J C,Stoffa P L.1994.Seismically inferred dilatancy distribution,northernBarbados ridge decollement:Implications for fluid migration and fault strength[J].Geology,22(5):411-414.
    Takeo M,Ueda H,Okabe Y,Matsuura M.2006.Waveform characteristics of deep low-frequency earthquakes:Time-series evolution based on the theory of the KM2O-Langevin equation[J].Geophys J Int,165:87-107.
    Von S D H,Smith K D,Preston L A.2008.Seismic spatial-temporal character and effects of a deep(25—30km)magmaintrusion below North Lake Tahoe,California-Nevada[J].Bull Seism Soc Amer,98(3):1508-1526.
    Wech A G,Creager K C,Melbourne T.2009.Seismic and geodetic constraints on Cascadia slow slip[J].J Geophys Res,114:B10316,doi:10.1029/2008JB006090.

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