When active, minor eruptions can occur every few minutes, lasting only a few seconds and reaching 6 to 10 feet. They don't even put out enough water to form a run off channel. But because of their frequency, even these are fun to watch. They pale in comparison though to the much less frequent major eruptions. The jetting of a major eruption reaches 35 to 40 feet and produces enough water to form a run off.
Majors have durations of several minutes to, on very rare occasions, as much as an hour.
Unfortunately, in recent years, periods of even minor activity have been rare. It is the only large pool in that portion of the basin. Eruptions can come from a full pool or at unusual times from a pool as low as six feet below overflow. Blue is usually active. Sometimes erupting as frequently as every 7 minutes but sometimes intervals are measured in hours.