The southern sumatera, Indonesia 7.9Ms quake
p, was not recorded, as this station was in the shadow
zone. Includes Closeups of the p-s and a long period area of interest,
which is not understood as it came before LQ and LR, only on the
S-G instrument.
the unshielded diamagnetic record
the coil & magnet record
the S-G with a Hall sensor record. Note the long period waves beginning before the time 31:44, which is pronounced here.
..........
A closeup of the short period phases of the 3 N-S seismometers
below
p-s record closeup with the diamagnetic seismo
the p-s record with the coil magnet
the p-s record with the S-G with a Hall sensor record
.........
An area of long period interest on the 3 (N-S) seismometers
long period waves with the diamagnetic seismo, where the coil magnet
shows similar results below.
long period area coil-magnet seismo. Very much like the diamagnetic
seismo record above.
S-G long period waves dramatically showing up. The amplifier
is set for 30 second response, but the longest wave period is roughly 60
seconds.