Fig. 9From: Temporal variation in source location of continuous tremors before ash–gas emissions in January 2014 at Aso volcano, JapanDistribution of source locations of continuous tremors. Distribution of the source locations of continuous tremors for all stages plotted in a map view and b cross sections based on Fig. 8a–c. The black circles and gray crosses are the results estimated using ten and six station pairs, respectively. The intersection of lines X-X’ and Y-Y’ indicates the center of the crater. Gray shaded areas represent the crack proposed by Yamamoto et al. (1999)Back to article page