Acta Geographica Sinica ›› 2014, Vol. 69 ›› Issue (1): 134-140.doi: 10.11821/dlxb201401013

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Spatial and temporal characteristics of large volcanic eruptions in 1750-2010

WANG Huan1,2, HAO Zhixin1, ZHENG Jingyun1   

  1. 1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2013-08-29 Revised:2013-11-06 Online:2014-01-20 Published:2014-01-20
  • Contact: 郝志新(1975-),女,内蒙赤峰人,副研究员,从事气候变化研究。
  • Supported by:
    "135" Strategic Research Project of IGSNRR, CAS, No.2012ZD001; China Global Change Research Program, No.2010CB950100; Basic Research Project of the Ministry of Science and Technology, No.2011FY120300

Abstract: Based on the dataset provided by Smithsonian Institution Global Volcanic Programme, we extracted the large volcanic eruptions (Volcanic Explosivity Index ≥ 4) events from 1750 to 2010, and then analyzed the main characteristics of large volcanic eruptions since 1750 by their geographic latitudes, elevations, years and months. The results showed that the most of large volcanic eruptions occurred around the margins of Pacific Ocean, and the islands of Sumatra and Java from 1750 to 2010, especially in the equatorial regions (10°N-10°S). Large volcanic eruptions were mainly observed at elevations of 1000-2000 m, and in January and April. The number of the occurrences in the summer half-year (from April to September) was larger than that of the winter half-year (from October to next March). Large volcanic eruptions had interdecadal fluctuations including 15-25 years and 35-50 years, which were detected by Morlet wavelet analysis, and more frequent cyclic fluctuation of volcanic eruption was found after 1870. There were more large volcanic eruptions events during the periods of 1750-1760, 1776-1795, 1811-1830, 1871-1890, 1911-1920, and 1981-1995.

Key words: large volcanic eruptions, interdecadal variations, spatial distribution