landslides is caused by human

to a large extent that this statement is true.

1. human cut down the trees for other usage, causing there are no roots
to grab and hold the loose slope materials.

2. human cut the slope to build roads and buildings on it. by doing so, weight
is added to the slope and lateral support is removed, it increases the shear
stress and increases the chance of landslide.

3. The use of explosion, machinery and heavy road traffic increase the
vibration and reduce the shear resistance and the cohesion of materials on
the slopes, increasing the chances of landslides.

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據聞係濫伐林木令表層泥土鬆散，一遇大水即沖下山坡。