| Date: | 2020-12-11 |
| Time: | 2042 E |
| Geyser: | Steamboat |
| Webcam: | No |
| Initial: | No |
| Major/Minor: | Major |
| Duration: | |
| Time Entered: | 2020-12-11 20:52:27 |
| Time Updated: | 2020-12-12 07:43:54 |
| Time Uploaded: | 2020-12-12 07:43:55 |
| Entrant: | K.Cooper |
| Observer: | YNR and YNM Seismographs. |
| Submitted to: | |
| Comments: | YNM shows clear waveform and spectrogram. YNR shows clear spectrogram, and a pretty clear waveform (the lines) signal. The YNR Waveform shows thickening a few seconds before YNM sometime around 20:41:45. |
| https://www.flickr.com/photos/jsjgeology/50709442586 | Norris Museum seismogram showing Steamboat Geyser's 8:42 PM major eruption on 11 December 2020. | |
| https://www.flickr.com/photos/jsjgeology/50709526702 | Tantalus Creek discharge graph showing Steamboat Geyser's 8:42 PM major eruption on 11 December 2020. |