The deadly flash floods that swept through parts of Nepal after originating in Tibet were caused by a glacial collapse and debris flow, not a 4.4-magnitude earthquake as initially reported, the US Geological Survey (USGS) said in an updated assessment.
The USGS said analysis of long-period seismic waves, data from nearby seismic stations and satellite imagery showed that no earthquake had occurred. It also revised the magnitude associated with the seismic event to 5.2 from the earlier 4.4 assessment.
