<div> Periodic oscillation of water levels in geysers and hot springs is quite common, as are reciprocal relationships between connected features--sometimes whole groups of them. Some examples:</div><div><br></div> The entire Daisy Group operates this way. Between eruptions of the two major geysers, water levels rise. When either Daisy and/or Splendid erupts, Brilliant Pool, Bonita Pool, and the other large geyser (Splendid or Daisy) drop. There have been documented periods when either Brilliant Pool or Bonita Pool went into overflow with corresponding ebb and dormancy of the other features.<div>
<br></div><div> Water levels in the Sawmill complex cycle over the course of hours from low to high water levels and back. When Sawmill erupts, it immediately begins to drain the system, and if it erupts for a long time (3+ hours), it results in an exceptionally deep drain of the associated feature--Churn, Spasmodic, Penta, Oval Spring, and "Twilight" Geyser.</div>
<div><br></div><div> Grand and Turban show a similar relationship once they have recovered from an eruption of Grand. When Turban is due (every 20 minutes, give or take), unless Grand is erupting or about to erupt, Grand drops. After Turban is done, Grand refills until around the time Turban is due.<br>
<br> When Giantess Geyser starts erupting, Vault Geyser immediately begins to drop. At some point later, an eruption of Vault is triggered, beginning with a rapid refill of its pool.</div><div><br></div><div> The Purple Pools, across the Firehole River from Giant Geyser, drop when Giant erupts.</div>
<div><br></div><div> When Sunset Lake at Black Sand Basin was active as a geyser in the mid-1990s, Rainbow Pool began to ebb, and continued to do so over the course of many months until it finally erupted, ending Sunset Lake's activity.<br>
<br> Spiteful Geyser often ebbs below overflow during an eruption of Fan and Mortar. Also, when Norris Pool was active in 1998 and 1999, Spiteful showed a strong sympathy with it, dropping during strong eruptions of Norris Pool, then refilling rapidly afterwards, sometimes triggering an eruption.<br>
<br> North Goggles Geyser and Goggles Spring rise and fall in lock-step until North Goggles erupts. As soon as North Goggles starts, Goggles Spring drops out sight. The relationship between Mastiff and Giant is similar--Mastiff will only start when water levels in the Giant Group are high, but as soon as it does, water levels drop rapidly throughout the system, apparently triggering an eruption of Giant.</div>
<div><br></div><div>David Schwarz</div><div><br><div class="gmail_quote">On Tue, Mar 13, 2012 at 8:40 AM, Davis, Brian L. <span dir="ltr"><<a href="mailto:brdavis@iusb.edu">brdavis@iusb.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Reading through "Geyser of Yellowstone" yet again, the description of Bead Geyser & "Terracette Spring" caught my eye. Evidently when water levels in Bead fall, "Terracette Spring" rises a few inches. Do these oscillate periodically, or chaotically? In a similar fashion when Steamboat erupts Cistern Spring can drop very deeply. What are some other common examples of this synchronicity between two or more features? Are many of these periodic pairs? At one point I developed a model that showed some of these behaviors, (in an attempt to understand Cistern Spring), but it confused me and I moved on... now I'm curious again?<br>
<br>
So... favorite periodic pairs, with oscillation periods if known?<br>
<span class="HOEnZb"><font color="#888888"><br>
--<br>
Brian Davis<br>
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