Seismograph Pool


Seismograph and Bluebell pools used to be known as the "Blue Pools." After the 1959 Hebgen Lake earthquake, which measured 7.5 on the Richter scale, the pools were renamed. At West Thumb, no one recorded the nature of the changes caused by the quake, but perhaps someone thought Seismograph Pool somehow "registered" the earthquakes. These days, Seismograph is sometimes muddy—but not from earthquakes. The mud comes from the runoff of nearby mud pots.

*Adapted from the NPS West Thumb Geyser Bain Trail Guide and the West Thumb Interactive Tour

Feature Type

Not Reported

Inventory ID



Latitude: 44.41587
Longitude: -110.571
Survey Date: June 21, 2000

Geographic Area: West Thumb
Thermal Region: West Thumb Geyser Basin
Thermal Complex: Lower Group
Ranger District Contact: Grant District, Matt Vandzura (307) 344-2601


Nordstrom, D. Kirk

Feature Data

Data Source Supplied By Sample Date Temp Vent Temp pH Cond Extended Data
Park 6/21/2000 61.8°C 74°C 5.2 1700 µS/cm No
USGS Nordstrom, D. Kirk 9/18/2001 75.9°C -- 7.87 1920 µS/cm Yes Details
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