Byrdina Svetlana auteur aut IRD Rucker C. auteur aut IRD Zimmer M. auteur aut IRD Friedel S. auteur aut IRD Serfling U. auteur aut IRD text journalArticle eng text/pdf born digital access This paper analyzes simultaneous self-potential and gas temperature variations recorded at Merapi volcano in spring 2011, the dry season shortly after the volcanic crisis 2001. Temporal variations of fumarole gas temperature show characteristic quasi periodic signals at scales 1-8 h and amplitudes up to ten degrees. We propose a simple graphical technique combining a wavelet scalogram and a cross-correlation analysis to demonstrate that the variations of gas temperature are systematically preceded by self-potential variations at the same scales. The influence of meteorological variations on these correlated signals can be ruled out. Rather, we suggest them to be related to the magma degassing in the upper conduits of the volcano. We discuss a semi-qualitative model to explain this correlation and the observed phase shift of about two hours. specialized Self-potential monitoring Hydrothermal system Gas monitoring Merapi 066 062 215 40-47 2012 0377-0273 https://www.documentation.ird.fr/hor/fdi:010055689 10.1016/j.jvolgeores.2011.12.002 0377-0273 [F B010055689] https://www.documentation.ird.fr/hor/fdi:010055689 https://www.documentation.ird.fr/intranet/publi/2012/04/010055689.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2012-05-04 2017-08-23 fdi:010055689 fre