<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <?fontfamily><?param Helvetica><?x-tad-smaller><HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=iso-8859-1"> <META content="MSHTML 6.00.2900.2523" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2>In the video, the shots of the pool are Strokkur. The one Geysir eruption I saw simply looked like a slightly larger and longer version of a Strokkur eruption. The distant shot probably is Geysir. The eruption position looks more like Geysir, but there is a camera angle or two that you could get a similar view of Strokkur.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>As for Strokkur, eruptions commonly start from a full pool of water. The entire contents of the pool rise suddenly and then jets of water explode from it. Since the pool's near-surface water is heaved upward in its entirety (I might describe it as a laminar flow-type behavior, rather than the turbulence seen in a typical geyser start), the effect is that of a big blue bubble.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>In June 2003, the vast majority of eruptions of Strokkur I saw included the blue bubble.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>I would expect blue bubble eruptions to be more prevalent in deep, comparatively narrow pool vents. Expanding steam comes from </FONT><FONT face=Arial size=2>deeper plumbing into the bottom of the pool --- this lifts the contents of the pool, while the weight of the overlying </FONT><FONT face=Arial size=2>water momentarily keeps the steam at bay.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Anyway, that's what I think-</FONT></DIV> <DIV><FONT face=Arial size=2>Alan</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV>J. Alan Glennon<BR>UCSB Department of Geography<BR>Santa Barbara, CA 93106 <BR><A href="mailto:glennon@umail.ucsb.edu">glennon@umail.ucsb.edu</A></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <BLOCKQUOTE style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=riozafiro@earthlink.net href="mailto:riozafiro@earthlink.net">Pat Snyder</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A title=geysers@wwc.edu href="mailto:geysers@wwc.edu">geyser observation reports</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, December 11, 2004 10:10 AM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> [Geysers] Strokkur and Geysir Video and Blue Bubble Questions</DIV> <DIV><FONT face=Arial size=2></FONT><FONT face=Arial size=2></FONT><FONT face=Arial size=2></FONT><FONT face=Arial size=2></FONT><BR></DIV>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?<BR><A href="http://www.geysircenter.com/english/video2.html">http://www.geysircenter.com/english/video2.html</A><BR><BR>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?<BR><BR>I would sure like to visit Iceland someday, along with Rotorua, Kamchatka and El Tatio, so I keep buying that lottery ticket every weekend!<BR>Thanks much!<BR>Pat Snyder<BR><?/x-tad-smaller><?/fontfamily> <P> <HR> <P></P>_______________________________________________<BR>Geysers mailing list<BR>Geysers@wwc.edu<BR>https://mailman.wwc.edu/mailman/listinfo/geysers<BR></BLOCKQUOTE></BODY></HTML>