  As an object of study, we chose the global activity of strong earthquakes (M
> 7). The subject of the study is the waiting time for the next strong
earthquake. The purpose of the study is to compare two distributions of waiting
time, one of which is calculated when ordering events according to world time,
and the second when ordering according to proper time. We have come up with
unique underground clock to counting proper time. The average waiting time is
25 days in world time, and 10 ticks in proper time. We assert with a high
degree of confidence that both distributions obey an exponential law. The
coefficients of determination are 0.94 in the first case, and 0.98 in the
second case. This is all the more surprising since our underground clock is a
rather crude measuring instrument. We also consider general issues related to
the chronologization of earthquakes. Keywords: proper time, deactivation
factor, main shock, foreshocks and aftershocks, exponential and power
distributions.
