Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998astl...24..716g&link_type=abstract
Astronomy Letters, Volume 24, Issue 6, November 1998, pp.716-721; Pis'ma v Astronomicheskii Zhurnal, Vol. 24, p. 827
Astronomy and Astrophysics
Astronomy
1
Scientific paper
Cheng et al. (1996) have shown that the statistics of gamma-ray bursts (GRBs) from SGR 1806-20 and earthquakes (EQs) share the same features with regard to the dependence of the frequency of events on their intensity, time sequence of the events, etc. Based on our previous results for EQs (Golitsyn 1996), we estimated the following parameters of cracks in the neutron-star crust: the crack length lc, the crack development time tau, and the mean relative displacement of adjacent crust blocks u. Our estimates turned out to be in agreement with the neutron-star size: for example, for SGR 1806-20, l_c is of the order of a small fraction of the length of the great circle, and the displacement is within several meters. However, the crack length for the most intense GRBs of the type observed by Mazets et al. (1979) is of the order of the length of the great circle, i.e., one stellar hemisphere could be twisted relative to the other. The development time of such events was estimated to be ~ 50 ms, in agreement with observations. We also estimated the characteristic frequencies (~ 1 kHz) and amplitudes of seismic waves; the latter can reach several meters in the case of hemisphere twisting.
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