Аннотация:These papers are concerned with the use of optimal filters for identification of
seismic signals from those recorded by the gyrotiltmeter with simultaneous recording of
possible noise signals, e.g., that due to atmospheric pressure. To successfully deal with a
wide range of urgent research and applied problems in seismology it is frequently
necessary to have information on the true or total motion in seismic phenomena; this
information includes knowledge, not only of displacements at the earth's surface along
the three axes at the recording site, but also tilts or rotations of ground at the site. This
problem is tackled using a special type of seismic instrument, the tiltmeter. The
gyrotiltmeter is one of the many tiltmeter types where the gyromotor is used as an active
sensor. The principal difficulty in the way of designing effective long period seismic
instruments, including gyrotiltmeters, consists in various kinds of noise, frequently not of
seismic origin, whose influence on the instruments increases as the instrument's response
function is expanded toward longer periods. We show examples from tests of algorithms
visually illustrating the fact that the application of optimal filters to the long period
channel of the gyrotiltmeter can substantially enhance the signal/noise ratio, thus
detecting seismic signals that are masked with induced noise.