I haven't seen anything like the short Grottos Scott and Paul described, but it sparks a memory. Whichever year (1997) the Johns were conducting a Grotto study they noted a few times when Grotto erupted very early after a marathon. Sometimes only a few hours after the end of a long marathon. These eruptions were very short (less than an hour) and seemed count as a little extra duration on the marathon in the sense that if you added their duration to the marathon and counted the marathon interval to the next 'real' Grotto it was about what the duration/interval formula would have predicted. None of these were seen that year so it's possible that Rocket had strong, early eruptions in those too. David Goldberg (from Karen's email account) --------------------------------- Start your day with Yahoo! - make it your home page -------------- next part -------------- An HTML attachment was scrubbed... URL: </geyser-list/attachments/20050815/4831474c/attachment.html>