Boston Marathon Tragedy: Estimating the Number of Runners in the Vicinity of the Explosions

Today’s tragic explosions occurred at about 4:09:50 of the official marathon time, according to video of the events.  Though it appears that more people finished the race early this year than last year, the 2012 statistics can provide a rough ballpark of the rate at which people were finishing the race around the time of the explosions.  In 2012, 582 runners finished the race with times of 4:08:00 – 4:10:59, or about 32 runners every 10 seconds (race times may not match up with the official marathon time).  During the 4:08:00, 4:09:00, and 4:10:00 minutes last year, the breakdown was as follows:

 Image

Thus, dozens of runners were likely in the vicinity of today’s explosions, as was confirmed by video of the incident.

(The breakdown from this year was not easily accessible.)

Source:  MarathonGuide.com

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