Table 4: Relationship between the average principal stress and the vertical principal stress in different countries in the world [23].

Country name
<0.80.8~1.2>1.2

China3240282.09
Australia022782.95
Canada001002.56
America1841413.29
Norway1717663.56
Sweden001004.99
South Africa4124352.50
Former Soviet Union5129204.30
Other areas37.537.5251.96