The first is the cause of the occurrence of an earthquake, it said that there are two reasons that causes include natural phenomena and human activities such as mining. Dams, etc. The volcanic section is caused by natural phenomena, just เดียย.
The first is the cause of the earthquake is said to have two causes are natural phenomena and human activities such as building mines. The dam caused by natural phenomena such as volcanoes, the only sister.
First, the cause of said that the earthquake has 2 causes, including natural phenomena and actions of human beings. Such as construction, mining, construction, etc., and the volcano caused by natural phenomena alone.