On the realtime monitoring of the long-period seismic wavefield
Kawakatsu, H.
in Methods and applications of signal processing in seismic network
operations, edited by T. Takanami and G. Kitagawa, Springer, 266pp,
251-257, 2002. (reprint of Kawakatsu (1998))
Abstract
A possibility of monitoring the long-period seismic wavefield
in realtime is suggested.
The seismic wavefield below 0.1\,Hz may be consistently modeled by
the earthquake activity field defined by
a point source moment tensor on 10\,km-mesh grid points.
With the current level of personal computers, it should be possible
to perform moment tensor inversions for all the mesh points to find
the best moment tensor every second.
A sparse regional broadband seismometer network appears suffice
to perform such realtime monitoring, which may eventually enable us to predict
the short-period ground motion in realtime as well.