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That's good, so its an app that you installed not a pre-loaded app, do you have any notification app, ringtone app, etc?
Simple if you unlock the screen lower the volume once it reach vibrate press volume down once more and it will turn it off
you can also pull down the notification bar > quick settings > sound (tap it twice)
Ok in that case open the messaging app > menu > settings > notification vibration uncheck it, do the same to other apps
Do you see the icon: speaker with an X on top?
That doesn't seem right, boot on safe mode and check again
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008