Last Known Eruption
86y 187d 23h 28m ago

Latest Eruptions

Eruption DurationInterval
03 Feb 1932 @ 142645m 1h 1m
03 Feb 1932 @ 13256m 30s 1h 0m
03 Feb 1932 @ 12254m 1h 0m
03 Feb 1932 @ 11254m

Interval Statistics

Interval Count3
Min1h 0m
Max1h 1m
Mean1h 0m
Median1h 0m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
9135 11 Jul 2018 @ 1055 --- Tara Clear and calm with light convection in SE corner. Overflow from center channel only. Dark emerald green color.
9100 10 Jul 2018 @ 0850 --- udo Clear. Quietly overflowing. No bubbling!
8946 29 Jun 2018 @ 1745 --- cb Emerald Spring still turpid, fairly clear green and in overflow! Putting out more water than I've seen since the 18th. (*Note the weather!)
8836 21 Jun 2018 @ 1221 --- Polly A little bit murky, which is a sign of a disturbance in the basin.
8796 19 Jun 2018 @ 1725 --- cb a few more areas that are bubbling. pool color is still green and clear
8778 19 Jun 2018 @ 0700 --- cb Emerald Spring is still clear and green in color but continues to have a 4 vent boil in the Southeastern thumb of the pool + a small boil to the right.
8773 18 Jun 2018 @ 2050 --- Tara Several areas of boiling and blipping along southeast edge of pool, no increase in runoff.
8769 18 Jun 2018 @ 1807 --- udo Boiling vigorously from 3 vents nearest b'walk.
8765 18 Jun 2018 @ 1720 --- cb rolling boil in 2 spots on the East thumb. 3 other areas with a slight boil.
8743 17 Jun 2018 @ 0935 17 Jun 2018 @ 1009 cb 3 areas that have a boil in the Eastern thumb of the spring.(in front of boardwalk) Still a nice clear emerald color.
8634 10 Jun 2018 @ 1900 --- Polly Water clear with no boiling. (Time approximate.)
8508 06 Jun 2018 @ 0907 --- novakg Not boiling. Overflow in south channel only. Quiet.
8435 03 Jun 2018 @ 1943 --- MAB Still quiet. Slight overflow in easterly channel, westerly channel dry. Some convection under the east ledge, other blips near center and west side, that's all. Same observations in morning but hard to see due to steam.
8331 28 May 2018 @ 1423 --- MAB Emerald still quiet, small center bubbles, as yesterday, but there was slight upwelling near the SE ledge area. Easterly runoff channel had some overflow, westerly channel still below overflow level and looked dry. Same observations at 1047 but it was hard to confirm runoff in the steamy a.m. light.
8316 27 May 2018 @ 2030 --- MAB Still very quiet. Now below runoff on easterly channel as well as westerly with only a few tiny bubbles from the center vent area. Morning observations were similar but too steamy to see the runoff area. (Time is approximate, after Steamboat!)
8302 26 May 2018 @ 0930 26 May 2018 @ 1830 MAB Emerald is as quiet as I have seen it. There is no runoff in the westerly channel, only barely some on the easterly channel.
8214 15 May 2018 @ 1900 --- MAB Morning and evening (~0945 and ~1900) Emerald still quiet - SE vents near the ledge small bubbles, tiny blips from center vent. FWIW ~ center vent did seem more vigorous on evening of 12th - but it could have been the evening light.
7722 17 Oct 2017 @ 1130 17 Oct 2017 @ 1730 MAB Still at high water level well above the rim on east side with clear water and high boils, runoff down by Monarch continues to be big.
7541 29 Sep 2017 @ 1424 --- Tara Churning and bursting grayish water to 1-4 feet.
6133 09 Sep 2017 @ 0730 --- ypcaribou Roiling large domes 2-3 ft high in SE part of pool near boardwalk. One dome rose and then burst to maybe 5-6 feet. High enough that we waited to see if it would go higher (it didn"t). Clear, blue pool roiling vigerously. Runoff on "backside" down hill and under boardwalk between Monarch and Minute was a steady, flowing stream. Ground on either side of channels very damp (not from rain).
4235 06 Jun 2017 @ 1640 --- JSJ In near-continuous, heavy roiling/doming to 1-2 feet high from the ~southeastern corner of the pool.
3686 18 Sep 2016 @ 1229 --- Betty Boiling vigorously
3090 18 Jun 2016 @ 0940 --- Janet White The color is returning and is now a dark green.
3092 17 Jun 2016 @ 1630 --- CrisG Pool continues to have rolling boil. The rim remains brown, however the center of the pool is noticeably blue.
2918 29 May 2016 @ 1000 29 May 2016 @ 1500 DanS Emerald Spring in Norris: Near Continuous Heavy Rolling Boil to 2+ feet
4720 22 Aug 1998 @ 1800 --- research-mab 8/22 Also note that Emerald Spring has expanded with water well beyond the “shelf like” formation.
4960 30 Aug 1978 @ 2210 --- research-mab 08/30/1978 At 2210 Emerald Spring was erupting quite violently an increase over recent activity
4958 13 Jul 1978 @ 1200 --- research-mab 07/13/1978 During the afternoon the three vents north of Emerald Spring dried up! Between the 1000 walk and the 1:30 walk!
4964 08 Mar 1978 @ 1800 --- research-mab 03/08/1978 continuous spouter ~ 14 ft north of Emerald Spring remains active
5123 17 Sep 1977 @ 1800 --- research-mab 09/17/1977 The satellite vent near Emerald, the one closest to the trail is splashing up to 3’.
5122 16 Sep 1977 @ 1200 --- research-mab 09/16/1977 Emerald Spring is extremely muddy this morning and two of the satellite vents have reactivated, one splashing noisily to two feet. These vents have not been active since the 1975 earthquake.
5544 08 Jul 1976 @ 0900 --- research-mab 07/08/1976 Emerald Spring turned cloudy since yesterday afternoon at 6:00 pm {no time in log}
5525 25 May 1976 @ 1800 --- research-mab 05/25/1976 Noticed that the 2 little satellite spouters near Emerald Spring are still dry. Apparently they never recovered from the effect of Aug 21, ‘75.
5657 26 Aug 1975 @ 1800 --- research-mab 08/26/1975 Emerald Spring – has regained its green color, boiling action continues. Surrounding features still dead. { R.I.P.}
5649 21 Aug 1975 @ 1530 21 Aug 1975 @ 1630 research-mab 08/21/1975 What’s Going On? Monarch is spouting steam bubbles from its quiet side as much as it does from its active side. Cistern appears to be more violent, and Emerald has gone crazy. (Observed in Walk 6, 3:30 to 4:30)
5628 21 Aug 1975 @ 0810 --- research-mab 08/21/1975 Drastic change in Emerald Spring and area around the pool! There is now a large boiling spot located near the front edge of the pool, just about at the middle section. It is boiling violently, to heights of 1-2 feet, & occasionally is actually “erupting” or being tossed up a few inches. The boiling area itself is quite large, perhaps 1 to 2 meters in diameter. Up to this time, the pool has been very quiet, with the bubbles rising gently to the surface & located at the front edge of the pool, but down at the extreme left end. The pool, which had gradually been regaining its emerald green color, is now very turbid – a muddy brown color. In the surrounding area, the little constant spouter located to the right of the pool has stopped all activity & is totally drained. It has continually spouted to heights of 2-3 feet all summer. Two smaller pools at the back edge of the spring have also completely drained. The boiling spouter on the hillside at the back edge of the pool (surrounded by white rock) has also stopped all action & is completely empty! All changes noted at 810 this am.
5617 21 Jul 1975 @ 1800 --- research-mab 07/21/1975 Emerald Spring – appeared faintly green for the first time today.
5588 24 May 1975 @ 1800 --- research-mab 05/24/1975 Springs around Emerald Pool very active – one constantly boiling 1’-2’.
5842 22 Sep 1974 @ 1800 --- research-mab 09/22/1974 Emerald’s Springs – have gained a bit of water since last night.
5838 21 Sep 1974 @ 1800 --- research-mab 09/21/1974 Emerald’s Springs – as yesterday, no further drop in water levels.
5830 20 Sep 1974 @ 1800 --- research-mab 09/20/1974 Emerald’s Springs – Going strong. The muddy spring appears to be down some more and the cold gas bubbler at the entrance SW of the group is dry. Several of the smaller spring are bringing up arsenic sulphides.
5828 19 Sep 1974 @ 1800 --- research-mab 09/19/1974 Emerald Spring – Same as yesterday, except the mud feature has dropped another 2” and is not as active.
5827 18 Sep 1974 @ 1800 --- research-mab 09/18/1974 Emerald’s Springs – All appear the same as yesterday- still very active. The “muddy pot” has dropped several inches & the 2 lower muddy water features have cleared considerably.
5826 15 Sep 1974 @ 1800 --- research-mab 09/15/1974 New feature (springs) near Emerald appear much as they did yesterday- if anything they are more active according to Scott.
5851 14 Sep 1974 @ 1800 --- research-mab 09/14/1974 At 1700- Emerald Spr area going crazy. Will write it up.
5823 14 Sep 1974 @ 1100 14 Sep 1974 @ 1400 research-mab 09/14/1974 Emerald Spr.- at 1100 was the usual clear green – at 1200 was murky – at 1230 was absolutely filthy brown – at 1340 was {as above} and springs have broken out on slopes to NE, N, and NW of Emerald. Total flow several gallons/minute!
5808 07 Sep 1974 @ 1800 --- research-mab 09/07/1974 Emerald Spr – boiling has declined and pool has cleared to “normal”
5801 06 Sep 1974 @ 1800 --- research-mab 09/06/1974 Emerald Spr – less violent looking; water beginning to clear
5752 14 Aug 1974 @ 0810 --- research-mab 08/14/1974 Emerald Spring – boiling very vigorously almost in eruption state~ Water slightly cloudy 0810
5735 24 Jul 1974 @ 1235 --- research-mab 07/24/1974 Emerald Spring – Boiling very vigorously – up to 2 ft upon occasion 1235
5726 14 Jul 1974 @ 0900 --- research-mab 07/14/1974 0900 On the way back noticed Emerald Spr “bubbling” up to 3 to 5 ft on a couple of occasions – will measure temp. Temp is 199º F with superheated surface boiling.
6140 13 Sep 1973 @ 0900 --- research-mab 09/13/1973 Back Basin 900am Bubbling noted from three locations in Emerald Spring
6135 10 Sep 1973 @ 0830 --- research-mab 09/10/1973 0830 Reduced boiling in Emerald Spring.
6055 18 Aug 1973 @ 1800 --- research-mab 08/18/1973 Emerald Spring very muddy and active
6044 24 Jul 1973 @ 1800 --- research-mab 07/24/1973 Emerald beginning to clear – still more active than normal
6039 23 Jul 1973 @ 1800 --- research-mab 07/23/1973 Emerald S. very muddy and active Temp of 200ºF
5960 02 Apr 1973 @ 1800 --- research-mab 04/02/1973 Emerald Spring: Bubbling activity has shifted from the southeast side to the middle (east of center) of the pool.
6378 09 Aug 1972 @ 1800 --- research-mab 08/09/1972 Noted Emerald Spring splashing water about 2’ (3’ later) high and water in pool itself is discolored. Temperature of Emerald at warmest accessible point=92ºC Congress Pool also “murky”
6353 30 Jul 1972 @ 1055 --- research-mab 07/30/1972 The SE edge of Emerald Spring had very vigorous boiling activity to a height of 2 feet at 10:55
6473 02 Oct 1971 @ 1800 --- research-mab 10/02/1971 Emerald Spring – water clear & dark green like last year but much bubbling on southeast side
6534 10 Sep 1971 @ 1800 --- research-mab 09/10/1971 Emerald Spring – more muddy and bubbling more vigorous since this morning.
6536 10 Sep 1971 @ 0900 --- research-mab 09/10/1971 Emerald Spring showed the greatest changes. All of the new springs on the North side of pool are inactive. The East side is very active and the whole pool is very turbid; no longer green. {morning check - no specific time noted}
7407 21 Jul 1968 @ 1800 --- research-mab 07/21/1968 Emerald Spring Boiling vigorously Temp 198ºF
7334 03 Sep 1967 @ 1800 --- research-mab 09/03/1967 Emerald Spring and Cistern both very active this pm.
7275 04 Jul 1967 @ 0800 --- research-mab 07/04/1967 Emerald Spring is changing from cloudy to clear
7227 30 Aug 1966 @ 1145 30 Aug 1966 @ 1645 research-mab 08/30/1966 Emerald Spring 189º @ 11:45 am At 4:20 – was noticeably agitated and temp surged to 192º while standing there 10 min. @ 4:45 was back to 190º and quieter.
7223 29 Aug 1966 @ 1800 --- research-mab 08/29/1966 Emerald – More agitated in both vents than yesterday, further substantiating the idea that when Echinus goes to short cycle, Emerald becomes more agitated. 192ºF
7212 25 Aug 1966 @ 1800 --- research-mab 08/25/1966 Emerald – 194º More agitated than usual.
7170 10 Aug 1966 @ 0800 --- research-mab 08/10/1966 Emerald Spring Temp 193º (max) clearing up (morning)
7162 08 Aug 1966 @ 1800 --- research-mab 08/08/1966 Emerald – Continues to clear
7159 05 Aug 1966 @ 1800 --- research-mab 08/05/1966 Emerald – Has a noticeable turbidity. Still bubbling – out of 3 tries no temp above 194º
7156 04 Aug 1966 @ 1800 --- research-mab 08/04/1966 Emerald - Highly agitated in PM and up to 196ºF
7144 27 Jul 1966 @ 1800 --- research-mab 07/27/1966 Emerald – A lot more active today but still 194º
7101 07 Jul 1966 @ 1800 --- research-mab 07/07/1966 Emerald Springs – Seemed to be more agitated all day.
6786 23 Oct 1964 @ 1800 --- research-mab 10/23/1964 Emerald is still a little cloudy.
6763 16 Oct 1964 @ 1800 --- research-mab 10/16/1964 Emerald is still a little murky at 184º
6748 09 Oct 1964 @ 1800 --- research-mab 10/09/1964 Emerald is still cloudy green.
6750 09 Oct 1964 @ 1800 --- research-mab 10/09/1964 Emerald is still cloudy green.
6715 05 Oct 1964 @ 1800 --- research-mab 10/05/1964 Emerald has cleared up & has about regained its transparency.
6689 27 Sep 1964 @ 1800 --- research-mab 09/27/1964 The consensus of opinion was unanimous that many features show a decided change. Bathtub has taken on a yellowish-brown color and Emerald has muddied to that the water is now a cloudy green.
7839 30 Mar 1932 @ 0000 --- research-mab RoND March 1932 p2: Observations by Ranger Curtis Skinner on March 30 and 31. Emerald Spring – funnel cavity filled with water, boiling vigorously from the three vents constantly, with eruptions 2 to 6’ high at intervals of about one hour.
7838 21 Feb 1932 @ 0000 --- research-mab {No times noted} Observation by Wilfred J. Mead on Feb. 21 - The funnel cavity was filled with water. Boiling vigorously from the three vents previously reported. Erupts 5-6’ high for 3 to 5 minutes at intervals of about one hour. Water color, grayish green
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