1. Jilin Changbaishan Volcano National Observation and Research Station, Institute of Geology, China Earthquake Administration, Beijing 100029, China
2. Key Laboratory of Seismic and Volcanic Hazards, China Earthquake Administration, Beijing 100029, China
3. Department of Geography, University of Cambridge, Cambridge, UK
4. Department of Earth and Planetary Sciences, Birkbeck, University of London, London, UK