| 溧阳两次地震前震活动图象的共性特征 |
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| 引用本文： | 孙寿成,胡连英.溧阳两次地震前震活动图象的共性特征[J].西北地震学报,1984,6(3):77-83. |
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| 作者姓名： | 孙寿成 胡连英 |
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| 作者单位： | 江苏省地震局
(孙寿成)，江苏省地震局(胡连英) |
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| 摘 要： | 本文研究了溧阳两次地震的前震活动现象,发现溧阳两次地震的前震活动图象具有某些共性特征:(1)前震活动的时间尺度雷同;(2)前震活动频度和强度同具有时强时弱的分期活动特点;(3)震前孕震空区形态相似;(4)临震前地震活动同具有条带分布图象;(5)前震活动在时—空图形上分别形成“时—空”弯形平静区。溧阳两次同源地震前震活动图象具有共性特征这一客观事实,可能反映两次地震在同一区域应力场作用下具有类似的孕震破裂过程。追溯这些过程,它们可能同受震源区及其附近的同一介质和构造条件的制约。
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| 收稿时间： | 1982/11/15 0:00:00 |
THE COMMON CHARACTERISTICS OF SEISMICITY PATTERN FOR THE TWO EARTHQUAKES AT LIYANG |
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| Sun Shoucheng and Hu Lianying.THE COMMON CHARACTERISTICS OF SEISMICITY PATTERN FOR THE TWO EARTHQUAKES AT LIYANG[J].Northwestern Seismological Journal,1984,6(3):77-83. |
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| Authors: | Sun Shoucheng and Hu Lianying |
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| Institution: | Seismological Bureau of Jiangsu Province, Nanjing, China and Seismological Bureau of Jiangsu Province, Nanjing, China |
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| Abstract: | In this paper, based on the data of foreshocks of two main earthquakes M=5.5, 1974 and M=6.0, 1979 at Liyang, Jiangsu Province the some common have been found in the foreshock seismicity pattern. They are the following:(1) These two earthquakes had almost the same duration of foreshocks activity.(2) The strong and weak foreshock activities before the two earthquakes occurred alternatively.(3) The geometry of the seismic gaps for the two main shock looked same.(4) The seismic activities in imminent term showed a band-shaped bistribution.(5) There was a bay-shaped quiet area of foreshocks for main shocks in a time-space diagram.The reason of characteristics shared by the fore-earthquake piror to the major shock occurring in Liyang mentioned above has been discussed in this paper also. The authors assume that the two earthquakes might have similar broken course under the equivalent stress field and traced back to the process, it is thoughe to be provided with the same condition of both medium and geological structure.Finally, these characteristics are of significance in earthquake predication. |
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