You usually get a few more seconds warning with a number two (solids move slower than liquids). (sitmeanssit.com)
I would second the warning about maintaining good form. (marksdailyapple.com)
Because a quake's strength isn't clear at first rupture, emergency response managers face a choice when issuing warnings: Issue alerts early and often (left), which could provide as much as 48 seconds of warning that light shaking might occur but risk false alarms; or wait to issue alerts until the size of the quake is better known (right) but risk the warnings arriving too late — providing an 8 - second warning in this hypothetical case. (sciencenews.org)