| Eruptive activity during the past 11,000 years at Medicine Lake volcano has been episodic. Eight eruptions produced about 5.3 cubic kilometers of basaltic lava during an interval of a few hundred years about 10,500 years B.P. After a hiatus of about 6,000 years, eruptive activity resumed with a small andesite eruption at about 4,300 years B.P. Approximately 2.5 cubic kilometers of lava with compositions ranging from basalt to rhyolite vented in nine eruptions during an interval of about 3,400 years in late Holocene time. The most recent eruption occurred about 900 years B.P. -- Donnelly-Nolan, et.al., 1990 |
