{"id":4234,"date":"2026-09-23T06:10:00","date_gmt":"2026-09-23T12:10:00","guid":{"rendered":"http:\/\/geysers.org\/wordpress\/?p=4234"},"modified":"2026-09-22T21:02:50","modified_gmt":"2026-09-23T03:02:50","slug":"observations-for-2026-september-22","status":"publish","type":"post","link":"http:\/\/geysers.org\/wordpress\/2026\/09\/23\/observations-for-2026-september-22\/","title":{"rendered":"Observations for 2026 September 22"},"content":{"rendered":"\n<p>We decided that we needed to get some sleep, so were not out in the Cage overnight. Instead, we arrived just before 06:00, while it was still dark.  It was another cool day that started out cold, damp and foggy, but once it cleared around 10:00, it was actually nice, although the sun was rarely visible<\/p>\n\n\n\n<p>Overnight nothing much had happened since the relatively strong Giant Hot Period that had allowed us to head in the night before. During the next 3-1\/2 hours, we saw some short Bijou pauses, and the occasional Mastiff surge, but no visible water in Mastiff, and all the pauses were relatively short.<\/p>\n\n\n\n<p>So I left to catch a Grand, in part to get out of the cage for a while. Grand cooperated, and I only had to wait an hour for the One Burst Grand eruption. There was absolutely no wind, so it was hard to see the activity through the steam.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">2026-Sep-22 : 10:49:50 G1Q\n\n 10:49:50\tB1\t--- d=11m43s\n 10:49:52\tTurban\t0m02s\n 10:52:57\tVent\t3m07s\n 11:01:33\tP1\t11m43s\n 11:02:13\tV&amp;T Quit\t12m23s\n\n\t\t\t\t     \t\u03a3D=11m43s\n\t* * * * *\n 09:36:20\t\t\td=03m16s\t\n 09:53:56\tInt: 17m36s\td=03m40s\t\n 10:13:19\tInt: 19m23s\td=03m57s\t\n 10:32:25\tInt: 19m06s\td=03m45s\t\n\t\t      Grand: 17m25s<\/pre>\n\n\n\n<p>After that, it was back to the Cage, where nothing continued to happen for the next 2-1\/2 hours. We would get occasional Mastiff surges, and sometimes Bijou would pause, but the pauses were short and only once did Mastiff show water.<\/p>\n\n\n\n<p>The big excitement\/entertainment was having a bison appear near the trees in front of Oblong, and having it slowly make its way north. It passed right by the Cage, trailing lots of insects and a strong odor.<\/p>\n\n\n\n<figure class=\"wp-block-embed aligncenter is-type-video is-provider-vimeo wp-block-embed-vimeo wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" src=\"https:\/\/player.vimeo.com\/video\/1229340988?dnt=1&amp;app_id=122963\" width=\"840\" height=\"473\" frameborder=\"0\" allow=\"autoplay; fullscreen; picture-in-picture; clipboard-write; encrypted-media; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\"><\/iframe>\n<\/div><figcaption class=\"wp-element-caption\">Bison passing by Bijou Cage, 2026 Sep 22.<\/figcaption><\/figure>\n\n\n\n<p>Finally, at 14:43, we saw Bijou suddenly pause with Mastiff having a large surge. At that point the activity progressed in the way we usually get for a Standard Bathtub, until about three minutes in Feather started pulsating. Within a minute Feather was erupting to about 10 cm, at which point it stopped for several seconds before restarting and then coming back strong.<\/p>\n\n\n\n<p>By then, Mastiff was near overflow, but it still took about two minutes for Mastiff to reach and begin to overflow. At this point, it became apparent that we were going to either get a strong Hot Period or maybe even an eruption. Mastiff then started surging, and then it too dropped and was quiet for a while.<\/p>\n\n\n\n<p>More and more of the small platform vents began to erupt by this point. Catfish restarted, along with Bijou. Within seconds of Mastiff's restart it was erupting to 3-4 meters, higher than Giant's Cone. At the same time Giant was vertically surging to the top of the cone.<\/p>\n\n\n\n<p>Mastiff erupted over five meters high for over a minute, with Giant's surging becoming stronger and more sustained. I would guess Mastiff reached twelve to fifteen meters at some point, although it was hard to see through the steam. Mastiff was so impressive that no one noticed that Feather's Satellite had started erupting at about the same time, something I had to see from a video replay.<\/p>\n\n\n\n<p>By then I had abandoned the Cage for the walkway to the south, in order to see the start of Giant's eruption instead of getting drenched. The start was as quick as always, and Giant quickly got up to full height, measured to over 200ft. The only part of the Cage which got wet, based on the wet boards, was around the post where I had mounted my camera.<\/p>\n\n\n\n<p>Since it was a daytime eruption, it was crowded in the Cage. Before I abandoned it, I think it had filled with a Chinese tour, with too many people trying to get their selfies. Back on the walkway, things were a bit more civilized.<\/p>\n\n\n\n<p>After about 45 minutes we started getting restarts. First it was Feather, then the Satellite, and finally Posthole was seen for the first time in years.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">14:43:15\tMastiff surge, Bijou already off\n14:44:30\tSW Vents spit\n14:44:57\tSW Vents erupt\n14:46:07\tFeather push, Mastiff at ovfl\n14:46:28\tFeather ovfl\n14:46:56\tFeather\n14:47:01\tFeather pause\n14:47:09\tFeather restart\n14:47:27\tCatfish erupting\n14:48:10\tMastiff below ovfl\n14:48:34\tMasfiff ovfl\n14:48:46\tCave erupting\n14:49:34\tMastiff front surging to 1m\n14:50:05\tMastiff erupting\n14:49:47\tBijou restart, Catfish quiet\n14:50:12\tB-C vent erupting\n14:50:22\tRust erupting, Mastiff ovfl only\n14:50:49\tMastiff front to 2m, then quiet\n14:51:39\tCatfish restart\n14:52:30\tMastiff start\n14:52:34\tFeather Sat. erupting\n14:52:37\tMastiff to 3-4m\n14:52:50\tMastiff 5+m front vent\n14:54:01\tGiant vertical above cone\n14:54:09\tGiant start of eruption\n\n15:39:27\tFeather restart\n14:43:10\tFeather Sat restart\n14:51:48\tPosthole erupting\n<\/pre>\n\n\n\n<p>At some point, someone seems to have deliberately and slowly lowered my camera, so it no longer was centered on the platform. I did manage to correct it when I had to change batteries. I stopped recording at about the time the eruption ended.<\/p>\n\n\n\n<p>All of signs moved this eruption. I especially enjoyed how the attempt to block the Giant sign into place failed miserably. It can be seen rolling in my Hot Period video. The Mastiff sign ended up under the Cage.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-medium\"><a href=\"http:\/\/geysers.org\/wordpress\/wp-content\/uploads\/2026\/09\/IMG_8285-scaled.jpg\" target=\"_blank\" rel=\"noreferrer noopener\"><img decoding=\"async\" loading=\"lazy\" width=\"600\" height=\"450\" src=\"http:\/\/geysers.org\/wordpress\/wp-content\/uploads\/2026\/09\/IMG_8285-600x450.jpg\" alt=\"\" class=\"wp-image-4238\" srcset=\"http:\/\/geysers.org\/wordpress\/wp-content\/uploads\/2026\/09\/IMG_8285-600x450.jpg 600w, http:\/\/geysers.org\/wordpress\/wp-content\/uploads\/2026\/09\/IMG_8285-1024x768.jpg 1024w, http:\/\/geysers.org\/wordpress\/wp-content\/uploads\/2026\/09\/IMG_8285-150x113.jpg 150w, http:\/\/geysers.org\/wordpress\/wp-content\/uploads\/2026\/09\/IMG_8285-768x576.jpg 768w, http:\/\/geysers.org\/wordpress\/wp-content\/uploads\/2026\/09\/IMG_8285-1536x1152.jpg 1536w, http:\/\/geysers.org\/wordpress\/wp-content\/uploads\/2026\/09\/IMG_8285-2048x1536.jpg 2048w, http:\/\/geysers.org\/wordpress\/wp-content\/uploads\/2026\/09\/IMG_8285-1200x900.jpg 1200w\" sizes=\"(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 984px) 61vw, (max-width: 1362px) 45vw, 600px\" \/><\/a><figcaption class=\"wp-element-caption\">Locations for four Giant Platform signs.<\/figcaption><\/figure><\/div>\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-medium\"><a href=\"http:\/\/geysers.org\/wordpress\/wp-content\/uploads\/2026\/09\/IMG_8289-scaled.jpg\" target=\"_blank\" rel=\"noreferrer noopener\"><img decoding=\"async\" loading=\"lazy\" width=\"600\" height=\"450\" src=\"http:\/\/geysers.org\/wordpress\/wp-content\/uploads\/2026\/09\/IMG_8289-600x450.jpg\" alt=\"\" class=\"wp-image-4237\" srcset=\"http:\/\/geysers.org\/wordpress\/wp-content\/uploads\/2026\/09\/IMG_8289-600x450.jpg 600w, http:\/\/geysers.org\/wordpress\/wp-content\/uploads\/2026\/09\/IMG_8289-1024x768.jpg 1024w, http:\/\/geysers.org\/wordpress\/wp-content\/uploads\/2026\/09\/IMG_8289-150x113.jpg 150w, http:\/\/geysers.org\/wordpress\/wp-content\/uploads\/2026\/09\/IMG_8289-768x576.jpg 768w, http:\/\/geysers.org\/wordpress\/wp-content\/uploads\/2026\/09\/IMG_8289-1536x1152.jpg 1536w, http:\/\/geysers.org\/wordpress\/wp-content\/uploads\/2026\/09\/IMG_8289-2048x1536.jpg 2048w, http:\/\/geysers.org\/wordpress\/wp-content\/uploads\/2026\/09\/IMG_8289-1200x900.jpg 1200w\" sizes=\"(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 984px) 61vw, (max-width: 1362px) 45vw, 600px\" \/><\/a><figcaption class=\"wp-element-caption\">Location of Mastiff Sign<\/figcaption><\/figure><\/div>\n\n\n<p>I left as the eruption ended because of what appeared to be nasty weather headed our way, rains which never happened. I also decided to not bother with Grand's upcoming eruption, so of course it not only has a short (less than seven hour) interval, but has two bursts.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>We decided that we needed to get some sleep, so were not out in the Cage overnight. Instead, we arrived just before 06:00, while it was still dark. It was another cool day that started out cold, damp and foggy, but once it cleared around 10:00, it was actually nice, although the sun was rarely &hellip; <a href=\"http:\/\/geysers.org\/wordpress\/2026\/09\/23\/observations-for-2026-september-22\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> \"Observations for 2026 September 22\"<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[133,4],"tags":[],"_links":{"self":[{"href":"http:\/\/geysers.org\/wordpress\/wp-json\/wp\/v2\/posts\/4234"}],"collection":[{"href":"http:\/\/geysers.org\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/geysers.org\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/geysers.org\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/geysers.org\/wordpress\/wp-json\/wp\/v2\/comments?post=4234"}],"version-history":[{"count":6,"href":"http:\/\/geysers.org\/wordpress\/wp-json\/wp\/v2\/posts\/4234\/revisions"}],"predecessor-version":[{"id":4247,"href":"http:\/\/geysers.org\/wordpress\/wp-json\/wp\/v2\/posts\/4234\/revisions\/4247"}],"wp:attachment":[{"href":"http:\/\/geysers.org\/wordpress\/wp-json\/wp\/v2\/media?parent=4234"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/geysers.org\/wordpress\/wp-json\/wp\/v2\/categories?post=4234"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/geysers.org\/wordpress\/wp-json\/wp\/v2\/tags?post=4234"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}