The aim of this study is an estimation of expression on landslides. Writer applies thermodynamics theory as the method of analysis, because landslides are outcome of the physical phenomenon. By this way, the estimation of expression on landslids could be expressed as follow.
Ca/a=f·Rr·d-1/(m+1)·(R-r)1+1/(m+1)
but, Ca: landslides area
a: basin area
f: constantical coefficient
Rr: relief ratio
m: coefficient by precipitation pattern
d: coefficient by precipitation pattern
R: continual precipitation
r: continual precipitation on innocent to landslides
By using the above the estimation of expression, writer can explain the qualitative phenomena on land-slides that have been observed till now and obtain the following conclusion.
(1) On the same precipitation, percentage of landslide areas is in straight proportion to relief ratio.
(2) In spite of the same precipitation, the difference of percentage of landslide areas appears by respec-tive patterns of it.
(3) Writer can get the relation between percentage of landslide areas and precipitation from curve of 2nd order to 1st order.
