| 澜沧-耿马地震的S波偏振及P波、S波振幅比变化特征 |
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| 引用本文： | 杨桂芬.澜沧-耿马地震的S波偏振及P波、S波振幅比变化特征[J].西北地震学报,1991,13(3):38-44. |
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| 作者姓名： | 杨桂芬 |
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| 作者单位： | 云南省地震局 |
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| 摘 要： | 本文通过对1988年11月6日云南澜沧—耿马7.6、7.2级强震前后S波偏振角的计算分析,得出大震前后U_(SH)—U_(Sv)的三种变化图象,这种变化特征具有一定的前兆意义。与此同时,对大震前后P波、S波最大振幅比值分布和S波偏振角空间分布进行研究发现,北纬22°57′可能是澜沧、耿马两地区介质差异的分界面。
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| 关 键 词： | 澜沧—耿马强震 S波偏振角 P波、S波最大振幅比 |
| 收稿时间： | 1990/12/11 0:00:00 |
S-WAVE POLARIZATION AND VARIATION CHARACTERISTICS OF AMPLITUDE RATIO OF P-AND S-WAVES FOR THE LANCANG-GENGMA EARTHQUAKE |
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| Yang Guifen.S-WAVE POLARIZATION AND VARIATION CHARACTERISTICS OF AMPLITUDE RATIO OF P-AND S-WAVES FOR THE LANCANG-GENGMA EARTHQUAKE[J].Northwestern Seismological Journal,1991,13(3):38-44. |
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| Authors: | Yang Guifen |
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| Institution: | Seismological Bureau of Yunnan Province, Kunming, China |
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| Abstract: | Three variation patterns of USH-USV of the Nov. 6,1988, Lancang-Gengma earthquakes(M=7.6, 7.2)have been obtained through calculating and analysing the S-wave polarization angles before and after the earthquakes. The variation characteristics possess precursory meaning. Study on the distribution of maximum amplitude ratio of P-and Swaves and spatial distribution of S-wave polarization angles before and after the earthquakes shows the line of 22°57''north latitude may be the medium boundary between Lancang and Gengma areas. |
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