Fig. 1
From: On the seismic response of instable rock slopes based on ambient vibration recordings
a Location of the site Gondo in Switzerland. b Overview of the whole rock slope with the measuring configuration (view to the North from the opposite valley flank); red dots are representing the measuring points including the reference station (GON101 = 101, etc.). c Detailed view of measuring point 201. d Aerial photograph taken from the helicopter showing the stations 101, 102 and 202. The red dotted lines divide the instability in the different risk potentials A2 and A2a. The yellow arrows represent the crack meters. The blue and red lines indicate the cracks. The distance from points 101 to 102 is around 8 m