The temporal decay of aftershocks follows Omori's law. It says that the rate of aftershocks decays with time and it is inversely proportional to the time after the main shock. Omori's original law was N(t) ∝ 1/t.
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Very cool! Also, these are all mentions of earthquake or earthquakes (English and Spanish) within tweets. Ten minute intervals, this shows the 6.4, 5.4, 7.1 quakes and the social media volume mentioning those terms.
Looks like a little bit of Omori’s law in there too. Either 1/t or exp(-at).
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