Dumitru Enescu
Abstract
The author presents a method for the determination of the energy of earthquakes
using the dislocation theory [1] – [4] and applies it to the earthquakes
in the Vrancea region. The method is treated by the author in papers [5] and
[6].
The energy is computed for 10 earthquakes in Vrancea (Table) by means of the
following formula deduced by the author for the theoretic seismic source corresponding
to rupture associated with slipping:
where: a and c are the velocities of longitudinal respectively transverse
waves within the medium of the focus;
– is
the density of the medium
r – radius of the rupture surface in the focus
b – modulus of the vector of Burgers
ta and
tc – times of increase of the first displacement in the longitudinal
viz. transverse waves.
The E values obtained by means of this formula are in close agreement with
the following energy – magnitude relationship [10]:
log E = 11.8 + 1.5 M.