严尊国, 薛军蓉, 曾新平. 长江西陵峡新滩滑坡地震记录的初步分析[J]. 华北地震科学, 1987, 5(4): 1-9.
引用本文: 严尊国, 薛军蓉, 曾新平. 长江西陵峡新滩滑坡地震记录的初步分析[J]. 华北地震科学, 1987, 5(4): 1-9.
Yah Zungue, Xue Junrong, Zeng Xinping. PRELIMINARY ANALYSIS FOR THE RECORD OF XINTAN LANDSL1P IN XILINGXIA OF THE CHANGJIANG RIVER[J]. North China Earthquake Sciences, 1987, 5(4): 1-9.
Citation: Yah Zungue, Xue Junrong, Zeng Xinping. PRELIMINARY ANALYSIS FOR THE RECORD OF XINTAN LANDSL1P IN XILINGXIA OF THE CHANGJIANG RIVER[J]. North China Earthquake Sciences, 1987, 5(4): 1-9.

长江西陵峡新滩滑坡地震记录的初步分析

PRELIMINARY ANALYSIS FOR THE RECORD OF XINTAN LANDSL1P IN XILINGXIA OF THE CHANGJIANG RIVER

  • 摘要: 长江西陵峡新滩滑坡地震记录较之通常滑坡记录有其一般特征,也有其典型性,记录波形中出现一组非常尖锐的清晰震相。本文通过滑坡附近10个地震台记录该震相的走时和衰减分析,以及震中距小于50公里的5个台站记录的波谱分析,确认它是整个滑坡过程中一次较强位错源辐射的直达S波震相,强度相当于一次ML=2.0级地震。本文同时分析了其与通常滑坡记录具有共性的波形,解释结果认为,滑波记录仅是滑坡过程中一系列较强位错源的辐射波,它是以S波为主的体波迭加结果。最后指出这次滑坡的形式可能不完全是重力作用的结果,不能排除区域构造活动的影响。

     

    Abstract: The waveform of Xintan landslip in Xilingxia of the Changjiang River, which had been recroded at 10 seismic stations, is similar to that of a general landslip.The mean velocity of the sharp phase is about 3.34 km per second.The attenuation property of the maximum amplitude is same as local earthquakes in this region.The corner frequancy for of its wave spectra equals to 0.33 Hz approximately, andvi the attenuation factor in the high-frequncy asymptotic trend for, is 2.2 on the average.Thus this phase is considered as the S-phase.#br#In this paper, at the same time, the recorded waveform of a general landslip is explai ned as the superposing wave whoes main part can be make up of the S-wave radiated from a series of stronger landslip dislocation source.#br#Finally, it is pointed out that the Xintan landslip is not all the result of the effect of gravity and the effect of the regional tectonic activity cannot be ruled out.

     

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