Fig. 1.
From: Short-term spatial change in a volcanic tremor source during the 2011 Kirishima eruption
Topographic map of seismic array location. Detailed configuration of the array is displayed lower left. Circles and the square indicate sensors and the broadband seismometer, respectively. The red circle and the pink dotted area show the pressure source from GPS data (Geographical Survey Institute of Japan, 2011), and the region with a velocity perturbation of −4% to −6% at a 3 km depth (Nishi and Kagiyama, 2002), respectively. The array response in the slowness domain at 2 Hz is shown at the lower right.