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Recent unrest of Changbaishan volcano, northeast China: A precursor of a future eruption?
Author(s) -
Xu Jiandong,
Liu Guoming,
Wu Jianping,
Ming Yuehong,
Wang Qingliang,
Cui Duxin,
Shangguan Zhiguan,
Pan Bo,
Lin Xudong,
Liu Junqing
Publication year - 2012
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2012gl052600
Subject(s) - volcano , geology , caldera , seismology , magma , unrest , magma chamber , phreatic eruption , volcanic hazards , explosive eruption , lateral eruption , induced seismicity , dense rock equivalent , earthquake swarm , geochemistry , politics , political science , law
Over 12 years of continuous monitoring of Changbaishan volcano in the border region of China and North Korea by means of volcanic seismicity, ground deformation, and volcanic gas geochemistry yields new evidence for magmatic unrest of the volcano between 2002 and 2006. In this so‐called “active period,” the frequency of volcanic earthquakes increased by about 2 orders of magnitude compared to that of the background “inactive periods.” The active period was also accompanied by ground inflation, high values of CO 2 , He, H 2 , and high ratios of N 2 /O 2 and 3 He/ 4 He in volcanic gases released from three hot springs near the caldera rim. The monitoring evidence implies pressurization of the magma chamber, possibly caused by incremental magma recharge. The ground deformation data from both GPS and precise leveling are modeled to suggest the corresponding deformation source is at 2–60 km depth beneath the volcano's summit, where earthquake swarms were detected in 2002 and 2003. Our findings suggest that the magma chamber beneath Changbaishan volcano has awakened and resumed activity after remaining dormant since AD 1903. There is an urgent need to keep close watch on this active and very hazardous volcano in northeast China.