Determination of the isotropic component of the 1994 Bolivia deep earthquake,
Hara, T., K. Kuge, and H. Kawakatsu
Geophys. Res. Lett., 22,
2265-2268, 1995.
Abstract
We determine the isotropic component of
the moment tensor of the 1994 Bolivia deep earthquake
using various seismic waves, including body waves,
surface waves, and normal mode data, in the period band
between 20 s and 1000 s. We carefully investigate
whether the isotropic component can be obtained
independently from the other components by checking the
correlation matrices. We show that it is possible to
obtain a precise estimate of the isotropic component by
using normal mode data in the period band between 550
and 1000 s. We find that the Bolivia earthquake
did not have a significant isotropic component in this
period band.