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Witness location : Mexico City (Mexico) (359 km NW from epicenter)
Time : T0+ 189 min
We were asleep, about 5 minutes before our quake alarm started beeping.... Then nothing, then the smooth movement (just dangling things). The question is was the sound of the alarm 5 minutes before a coincidence?? It s such a long time! Why did it sound? Could there be any relation?