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Grand Geyser and the Triplets


Was in the process of doing a final backup of a computer that I bought in 2006 and is having problems restarting. I keep it around mostly to run a few programs that won't run on newer machines because those programs only work on a PowerPC processor.

Was looking through a directory of photos and came across a few that I'd forgotten about. I believe these came to me via Rocco Paperiello back in late 2008, and are part of a package of documents he found concerning the building of the first boardwalks in the Upper Geyser Basin. So they date back to the early 1950s or so.

This one of Grand and vicinity is interesting for a number of reason. In the background is the new boardwalk, pretty much at its current position. You can see a pile of lumber and a couple of people working on it.

In the lower left are a couple of craters which I believe are North Triplet on the right, and East Triplet on the left. These would correspond the Grand Sputs of today, with Sput D/Delta on the right and Sputnik/Sput B on the left. It looks like Percolator can be seen as a dark spot if one draws a line between the leftmost crater and the pile of lumber. Note that the feature we called East Triplet in the early 1980s would have been located above and to the left of the vent here.

But also note the number of posts in the ground around the area, and the directions they face. Not just the ones by North Triplet and Grand, but behind the latter sign, beyond Turban, is another post. There's also a fourth, short post between the right most North Triplet vent and Percolator. Also of interest is that the Grand sign is positioned to be read by a person on the hillside, while the North Triplet side faces away.

A second photo is a slide that was probably made a few years later. Notice style of the West Triplet sign hasn't changed much. But also, there was a little boardwalk spur leading out toward Grand with another sign log at its end.


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Grand's North Triplet Sputs


It appears that the locations and designations of the various sputs that have appeared in and around the old site of North Triplet are in need of further documentation. In going through some old files, I came across photos that Lynn Stephens took of that area in October 1989. While a lot of things there have changed since then, this does give a good record of what was happening there, and how it relates to current activity.

Sketch map of Grand's Sputs area. From 1989.

The map comes from my original GOSA Transactions article on the area, and is still a good guide. The only major difference is the disappearance of East Triplet, and the associated Sput-Cs near it.


Sputs overview, Oct 1989. Photo by L.Stephens.

In the center of this photo, with a downed branch beside it, is Sputnik, or Sput-B. To the left, the plume of steam, is Delta, or Sput-D. In the foreground are several frying pans constituting Sput-E, which are no longer active, but the area is still devoid of vegetation.


Sputs-F, Sputnik and East Triplet. Photo by L.Stephens.

On the left edge of the photo the rim of East Triplet's vent can be made out. Above and to the right, beside the downed log is Sputnik. The large brown area of dead grass is Sput-F. Eventually, three areas of activity became more pronounced and were given sub-designations.

Sput-F. Photo by L.Stephens.
Sput-F3. Photo by L.Stephens.
Sput-F1 and Sput-F2. Photo by L.Stephens.

Sput-B1. Photo by L.Stephens.
Sputnik (Sput-B), 1989 Sep 17. Photo by L.Stephens.

Sputnik also developed some satellite vents, one on each side. Over the years the craters have been filled and cleared out, so which is which is probably not possible to determine any more.


Sput-E1 and Sput-B2. Photo by L.Stephens.

In the foreground is the wet frying pan at the north end of Sput-E. Behind it, in the middle of the photo is Sput-B2, while Sputnik itself is near the top of the photo.

Note that at this time, Sput-D was a small hole which steamed heavily. Over the years it enlarged itself.


Grand Sputs in 2020. Photo by H.Koenig

The photo I took last year isn't from up close, but one can still see the are of Sput-F is still active, and the grass there hasn't recovered. Finally, here is a short video showing the area with everything that was active in June 2020.

Grand Sputs, 2020 Jun 25. Video by H.Koenig