6 september 1975, quake in turkey, lice. Nearly 2500 death
7 September 1999, 6.0 quake in greece, 143 death
8 September 1905, 7.9 quake in kalabria, italy, 2500 death
9 september 1954, 6.8 quake Orleansville, Algeria, ca 1300 death
10 september 1943, 7.4 quake Tottori, Japan 1200 death
11 september 1930, volcan stromboli strongest eruption
11 september 1996, germany, tetschenthal. A Mountain break apart was foldet with a registered 5.5 magnitude quake

by the way from 11 september until end of the year exactly 111 days

14 september 1509, quake destroys konstantinopel, 13000 death
15 september 1590, 6.0 quake near Vienna, austria
16 september 1978, 7.8 quake in Iran, 15000 death

18 september 1870, Henry Dana Washburn give the name Old Faithful to the yellowstne geysir.

19 september 1985 8.1 quake Michoacán, Mexiko,, officialy 9500 death, inofficially more than 30000 death


21 september 1999 quake in Taiwan, about 2200 death


That has to be enough, i just listed the quakes, the mentioned days included very lots of hurricanes and ship sinkings with more casualities than the quakes.

so watch the days through history when no strong quake occured(11), 12,13,17 and 20 of september