[Geysers] Strokkur and Geysir Video and Blue Bubble Questions

[Pat Snyder]

On one of my Google searches, I found this link to a video of Strokkur 
and Geysir erupting. I suspect the close up at the beginning is 
Strokkur (it looks like photos I have seen of it) and then the distance 
shot is Geysir. Is that correct?
http://www.geysircenter.com/english/video2.html

Also, I have a book called "Volcanoes" that has an excellent photo 
series on Strokkur. In both the book photos and in this video, Strokkur 
makes a gorgeous blue bubble before it erupts. My question is (which 
could not be answered by my friend who recently went to this geyser 
field), does Strokkur make this blue bubble most of the time? And, 
because I am a novice Gazer, could someone please explain what they 
dynamics are that create blue bubbles? Why do some geysers make them 
and others do not? And are they more common to certain types of 
geysers?

I would sure like to visit Iceland someday, along with Rotorua, 
Kamchatka and El Tatio, so I keep buying that lottery ticket every 
weekend!
Thanks much!
Pat Snyder
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