Volcanic eruption features of Laoheishan and Huoshaoshan in Wudalianchi

By research with field investigation and observation records of volcanic eruption,combining with the achievement in volcanic research home and abroad,the authors discuss the volcanic eruption features of Laoheishan and Huoshaoshan in Wudalianchi of Heilongjiang,China in volcanic genetic type,eruption mode,eruption symptom and other aspects,and point out that the Laoheishan and Huoshaoshan volcanoes are monogenetic in genetic type,the eruption mode is not a simple way of central eruption,but experienced fission eruption turn to central eruption.Through the analysis of volcanic eruption observational record and the comparison with foreign volcanoes,it is revealed that this volcanic eruption possesses precursor which features benefit the monitor and forecast future volcanic eruption.