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FENG DE-YI, WANG ZHOU-YUAN, Gu JIN-PING, SHENG GUO-YING, LI KE-LONG. 1980: ANOMALOUS VARIATIONS OF SEISMIC VELOCITY RATIO BEFORE THE SONG-PAN(松潘)—PINGWU(平武) EARTHQUAKE (M=7.2) OF 1976. Acta Seismologica Sinica, 2(1): 43-54.
Citation: FENG DE-YI, WANG ZHOU-YUAN, Gu JIN-PING, SHENG GUO-YING, LI KE-LONG. 1980: ANOMALOUS VARIATIONS OF SEISMIC VELOCITY RATIO BEFORE THE SONG-PAN(松潘)—PINGWU(平武) EARTHQUAKE (M=7.2) OF 1976. Acta Seismologica Sinica, 2(1): 43-54.
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ANOMALOUS VARIATIONS OF SEISMIC VELOCITY RATIO BEFORE THE SONG-PAN(松潘)—PINGWU(平武) EARTHQUAKE (M=7.2) OF 1976

  • The Seismological Institute of Lanchow, State Seismological Bureau

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  • Published Date: August 31, 2011
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    • Abstract
  • Using the observational data of travel times of the direct seismic waves, recorded at the networks of seismic stations in Sichuan (四川) and Gansu (甘肃) Provinces, the preliminary studies of the velocity ratio anomaly before the Songpan-Pingwu earthquake in Sichuan Province of August, 1976 were made. The obtained results indicate that bofore this earthquake the anomalous variation of the velocity ratio was quite obvious, the durations of the Vp/Vs anomaly and its recovery were rather short. The anomalous region of very large extent was located to the south of the epicentral area of the main shock within Sichuan Province. Certain features of the Vp/Vs anomaly seem to show the connection and also difference between this earthquake and the Songpan-Nanping (Ms=6.5) of August, 1973. In consideration of the characteristics of the velocity ratio anomaly observed in this region, the related problems of its recovery and the superposition of the anomalous regions have been briefly discussed.
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    • References (1)
  • [1] 冯德益等,我国西部地区一些强震及中强震前后波速异常的初步研究(一),地球物理学报,19, 3, 1976.

    [2] 冯德益等,我国西部地区一些强震及中强震前后波速异常的初步研究(二),地球物理学报,20, 2, 1977.

    [3] 冯锐等,海城地震前后地震波速比的变化,地球物理学报,19, 4, 1976.

    [4] 郭增建等,震源孕育模式的初步讨论,地球物理学报,16, 1973.

    [5] 饭塜进,1968年十胜冲地震前后におけるVp/Vs 时间的变化,地震,第2辑29卷3号,1976.

    [6] 三东哲夫,Vp/Vs比の异常值回恢后の地震凳生のねくた、にいて,地震,第2辑28卷1号,1975.

    [7] Amos Nur, Dilatancy pore fluids and premonitory variations of ts/tp travel times, BSSA, 62,5, 1972.

    [8] В.И.Мячкин,Ъ.В.Костров,Г.А.Соδолев., О.Г. Мамина, Основы фнзики очага ипредвестникн землетрясений, сδ. 《Физика очага землетрясения》,Изд。《Наука》Москва,1975.
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