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Observations for 2023 August 12


Went out to Grand before midnight, and caught what was probably another Turban Delay Interval. That eruption of Turban lasted almost six minutes, while the next Turban eruption had no overflow from Grand. So the One Burst Eruption most likely occurred on the fourth Turban Interval after the Eruption Delay (D4).

2023-Aug-12:01:03:41 G1Q

01:03:41	Grand B1	---	d=11m58s
01:04:27	Turban		0m46s
01:07:03	Vent		3m22s
01:15:39	P1		11m58s
01:16:32	V&T Quit	12m51s

				     	ΣD=11m58s
	* * * * *
Yesterday 23:48:33			d=5m55s 	
00:07:05	Int: 18m32s	d=4m42s 	
00:26:31	Int: 19m26s	d=4m01s 	
00:44:31	Int: 18m00s	d=4m12s 	
		      Grand: 19m10s

Less of a wait for the Grand eruption at dawn. Arrived in time to experience another Turban Delay Interval, but fortunately, the One Burst Grand was the result.

2023-Aug-12:07:12:31 G1Q

07:12:31	Grand B1	---	d=11m19s
07:13:49	Turban		1m18s
07:14:50	Vent Ovfl	2m19s
07:16:16	Vent		3m45s
07:23:50	P1		11m19s
07:24:41	V&T Quit	12m10s

				     	ΣD=11m19s
	* * * * *
06:47:44			d=0m54s 	
		      Grand: 24m47s

Tried to visit the Lower Basin, but arrived at a nearly full Paint Pots parking lot at 09:00 to see Fountain in eruption. It was over by the time we walked out there. Based on an observation of Great Fountain the previous evening, we also decided to try biking out to it on another time.

The mid-day Grand turned into the afternoon Grand when another Turban Interval Delay took eight more Turban eruptions to recover. This eruption of Grand started with about 16 seconds of boops, including one shot up to 8 meters high, angled to the south. The start of the eruption itself was unimpressive, but fortunately, we got a second burst that was much higher. The second burst ended with a total eruption duration less than ten minutes, so it was disappointing when Grand's pool immediately drained with no attempt to refill.

Grand super-boop
2023-Aug-12:15:53:56 D8/G2C

15:53:39	Boop		-0m16s
15:53:56	Grand B1	---	d=8m27s
15:54:50	Turban		0m54s
15:55:10	Vent Ovfl	1m14s
15:57:06	Vent		3m10s
16:02:23	P1		8m27s	d=0m41s
16:03:05	B2		9m08s	d=0m41s
16:03:46	P2		9m50s
Vent & Turban continue

				     ΣB=9m08s	ΣD=9m50s
	* * * * *
12:40:13			
12:55:54	Int: 15m41s	d=4m21s 	
13:31:24	Int: 35m30s	d=5m11s  D0	
13:49:19	Int: 17m55s	d=4m21s  D1	
14:08:06	Int: 18m47s	d=3m50s  D2	
14:25:49	Int: 17m43s	d=3m42s  D3	
14:44:10	Int: 18m20s	d=3m36s  D4
15:02:17	Int: 18m06s	d=3m47s  D5
15:19:14	Int: 16m57s	d=3m21s  D6
15:36:20	Int: 17m06s	d=3m44s  D7	
		      Grand: 17m35s

There is at least one raven which has learned to clean up after the crowd at Grand disperses. Sometimes there's been a companion, but it usually starts at the northern runoff and works its way down the benches. So far it's kept its distance from people but I expect them to start checking bags and packs at some point.

If Grand had erupted on the next Turban eruption instead of the one in which it did, this would not have been a four Grand day. Instead the One Burst Grand eruption came five minutes before midnight. There wasn't any Turban Delay Interval, just a series of Turban eruptions where the duration and the intervals were getting shorter. At around the eight minute mark in the eruption, there was a false pause, and then Grand continued for almost another three minutes.

2023-Aug-12:23:55:02 G1Q

23:54:50	Turban		-0m12s
23:55:02	Grand B1	---	d=10m55s
23:57:31	Vent		2m29s
00:03:10	FP		8m07s
00:05:57	P1		10m55s
00:06:49	V&T Quit	11m47s

				     	ΣD=10m55s
	* * * * *
21:48:14			d=4m29s 	
22:07:55	Int: 19m41s	d=4m04s 	
22:26:59	Int: 19m04s	d=3m49s 	
22:45:49	Int: 18m50s	d=4m02s 	
23:03:16	Int: 17m27s	d=4m03s 	
23:20:44	Int: 17m28s	d=3m15s 
23:37:26	Int: 16m42s	d=3m34s 
		      Turban: 17m23s