There is cause for concern when hearing seven short and one long blast, though. (General alarm; something has happened. Better head for the muster station to find out what...)
There's a General Alarm signal (above), but no Abandon Ship signal. The captain gives those manually.
(I may be blatantly wrong!)
The General Alarm typically calls for the crew to proceed (at haste!) to the muster station to be informed of the nature of the emergency and be put to work handling the situation.
Luckily, I've only ever had to abandon ship during a couple of drills.