At about 8 pm in the evening of Sunday 9 April 2000, a huge landslide occurred in the Yi Gong district, Tibet, China (1Fig. 1). A gigantic volume of soil and rock slipped from the upper hillside at more than 5500 mPD (metres above the Principal Datum, i.e, the Yellow Sea Level) along the Zamu gully, down to the Yi Gong River at about 2000 mPD, as shown in the site photos, a & b in 2Figure 2 respectively. It travelled about 8 km and lasted about 10 minutes. The landslide debris was composed of snow, glacial...

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