姜家兰, 张春生. 陕西地区近地震的尾波特征[J]. 华北地震科学, 1990, 8(2): 79-88.
引用本文: 姜家兰, 张春生. 陕西地区近地震的尾波特征[J]. 华北地震科学, 1990, 8(2): 79-88.
Jiang Jialan, Zhang Chunsheng. CHARACTERISTICS OF CODA WAVE OF THE LOCAL EARTHQUAKES IN SHANXI REGION[J]. North China Earthquake Sciences, 1990, 8(2): 79-88.
Citation: Jiang Jialan, Zhang Chunsheng. CHARACTERISTICS OF CODA WAVE OF THE LOCAL EARTHQUAKES IN SHANXI REGION[J]. North China Earthquake Sciences, 1990, 8(2): 79-88.

陕西地区近地震的尾波特征

CHARACTERISTICS OF CODA WAVE OF THE LOCAL EARTHQUAKES IN SHANXI REGION

  • 摘要: 按照K·AKi提出的地震尾波理论,以陕西省区域台网短周期地震仪记录的小地震尾波资料为基础计算表明:不论震中距有多么不同,这些地震的尾波震幅衰减曲线都几乎是相互平行的,而且尾波振幅只与台站周围一定范围内地表地质条件有关。最后引进阿拉斯加两次大地震的尾波振幅衰减与其已知的地震矩经验公式,算出陕西地区一批小地震的地震矩,并用地震矩和震级资料求出地震矩~震级的经验关系,对这种关系式与其它地区的结果进行了讨论。

     

    Abstract: The coda wave features of small earthquakes recorded by the shaanxi seismic network have been investigated by using Aki's coda wave theory. The result in dicates that tile decay curves of coda amplitude are almost parallel to each other irrespective of its differences in the epicentral distance, and the coda amplitudes are onIy related to the geological condition around the station in rhea certain scope. The theoretical nomograms of short period seismograph DD-1 and the coda wave decay curves have been illustrated in terms of the singIe baekscattering model, from which the average frequencies and the distribution of Q vaIues for 11 stations have been estimated,. The Q vaIues range from 108 to 230 with an average 170 between 1.19 and 1.59 Hz. Finally some seismic moments of small earthquakes in shaanxi have been computed by using the empirical formul of coda amplitude and seismic moment in Alaska, furthermore an empirical reIationship between moment and magnitude has been got and compared with that in the other regins.

     

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