| Date: | 1991-02-21 |
| Time: | 1200 A |
| Geyser: | Fan and Mortar |
| Webcam: | No |
| Initial: | No |
| Major/Minor: | N/A |
| Duration: | |
| Time Entered: | 2020-04-26 08:11:35 |
| Time Uploaded: | 2020-04-26 08:11:35 |
| Entrant: | mhreed |
| Observer: | Jens Day (?) |
| Submitted to: | |
| Comments: | No time given assuming it was seen in daylight because winter. Active since 1990/08/09 eruption. From the April 1991 Sput: "The Fan and Mortar eruption seen on February 21 began with a 'Grand Canyon-Lower Mortar-Arch' {aka East-Lower-Bottom} start which was additionally a rejuvenation start. The initial surges came only 33 seconds after the first renewed steady jetting by Gold High et.al. and just 10 seconds before being joined by Fan's Main Vent." |