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

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.