From: Ambient noise tomography in the Naruko/Onikobe volcanic area, NE Japan: implications for geofluids and seismic activity
Frequency [Hz]
Number of paths
0.150
588
0.175
746
0.200
850
0.225
864
0.250
845
0.275
819
0.300
744
0.325
703
0.350
651
0.375
598
0.400
565