Geography Reference
In-Depth Information
Figure 10. Cluster analysis of selected data from BAIK Catalog for 1987-1992: a)
dT
and
dS
dependences of the number of earthquake pairs, with marked intervals for
further clustering; b) rose diagrams showing the space azimuth patterns of the clustered
pairs (
dT
= 1-20,
dS
= 1-50). See prominent SE-NW orientations in 1991; c) the length
of the revealed clusters and the number of earthquakes in them: the longest clusters of
1991 form a continuous sequence containing 12, 9, 8 and 4 event.
Figure 11. Aftershocks nearest in time: a) map of aftershock sequences and swarms
detected by the program for 1987-1992; b) azimuths of aftershock pairs in 1990, when
they markedly increased in number; c) number of events in aftershock sequences.
Histograms describing the seismic process (2 ≤
M
≤ 4) in 1988-1992 after removal of
aftershocks: d) total released energy per month and e) annual number of events.
