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http://dx.doi.org/10.7780/kjrs.2014.30.2.9

Sakurajima volcano eruption detected by GOCI and geomagnetic variation analysis - A case study of the 18 Aug, 2013 eruption -  

Kim, Kiyeon (National Institute of Meteorological Research, Korea Meteorological Administration)
Hwang, Eui-Hong (National Institute of Meteorological Research, Korea Meteorological Administration)
Lee, Yoon-Kyung (Korea Ocean Satellite Center, Korea Institute of Ocean Science & Technology)
Lee, Chang-Wook (National Institute of Meteorological Research, Korea Meteorological Administration)
Publication Information
Korean Journal of Remote Sensing / v.30, no.2, 2014 , pp. 259-274 More about this Journal
Abstract
On Aug 18, 2013, Sakurajima volcano in Japan erupted on a relatively large-scale. Geostationary Ocean Color Imager (GOCI) had used to detect volcanic ash in the surrounding area on the next day of this eruption. The geomagnetic variation has been analyzed using geomagnetic data from Cheongyang observatory in Korea and several geomagnetic observatories in Japan. First, we reconstruct geomagnetic data by principal component analysis and conduct semblance analysis by wavelet transform. Secondly, we minimize the error of solar effect by using wavelet based semblance filtering with Kp index. As a result of this study, we could confirm that the geomagnetic variation usually occur at the moment of Sakurajima volcano eruption. However, we cannot rule out the possibilities that it could have been impacted by other factors besides volcanic eruption in other variation's cases. This research is an exceptional study to analyze geomagnetic variation related with abroad volcanic eruption uncommonly in Korea. Moreover, we expect that it can help to develop further study of geomagnetic variation involved in earthquake and volcanic eruption.
Keywords
Sakurajima volcano; GOCI; geomagnetic variation; principal component analysis; wavelet based semblance; eigenvalue;
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