Open collaboration setting in Google My Maps allowed people to add coloured markers to the map to say whether they heard the explosion or not. Red markers meant they 'heard a loud boom, windows or building shook', blue markers that they 'heard it, but no further detail', yellow indicates it was 'heard with no shaking' and green indicates the explosion was not heard. The clustering of the markers pointed where the explosion originated.
Full story at: readwriteweb.com
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