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Clusters
Earthquakes
1
125
1
64
1
60
1
56
1
49
1
43
1
36
1
26
1
25
1
24
1
21
1
16
1
13
1
9
4
8
2
7
3
6
5
5
3
4
3
3
8
2
29
1
As might be
expected, we obtain
more smaller
clusters when the
grouping distance is
reduced to half a
degree. However, all
the big clusters still
remain big clusters.