TIANCHI volcano,Changbaishan Mountains isthe largest modern active volcano in East Chi-na.Many times strong volcanic erupting activ-ities occurred in the Cenozoic Era.The vol-canic activities have revived again in the Re-cent.Field investigation results show thatthere are a lot of hydrothermal anomaly out- TIANCHI volcano, Changbaishan Mountains is the largest modern active volcano in East Chi-na. Many times strong volcanic erupting activ-ities occurred in the Cenozoic Era. Vol-canic activities have revived again in the Re-cent. Field investigation results show that there are are a lot of hydrothermal anomaly out-