Volcano Research Center Dr. Ohminato
Velocity seismograms for 1min recorded at 3 stations, CND, KAS and
OFN.
All the seismograms except for vertical component at OFN are clipped.
2480 on the horizontal axis corresponds to 18:41:21(JST). Exact origin times
for individual stations are
CND 18:41:20.818
KAS 18:41:20.969
OFN 18:41:21.442
Fig.2 The broadband signal from the vertical component of velocity at
station OFN is filtered in various frequency range.
From top to the bottom, unfiltered, high-pass filtered at 1Hz,
band-pass filtered from 10sec to 1 sec, and low-pass filtered at 10sec.
Displacement seismogram integrated from velocity record shown in
Fig.2.
Notice that the ground motion starts with upward motion.
