a social appointment or date arranged, usually by a third person, between two people who have not met. 2. either of the participants in such an arrangement. Origin of blind date. 1920-1925.
1 Mount Teide is currently a dormant volcano, but many scientists believe it will erupt again in the near future. 2  In the mid seventeenth century a group of Englishmen were the first Europeans to reach the summit of Mount Teide. The most recent eruption of Mount Teide happened in 1909. 2  It also erupted in 1798, 1706, 1705 and 1704. 3  On his voyage of discovery Christopher Columbus apparently saw the 1492 eruption of Mount Teide when he was sailing past Tenerife.
When these earthquakes occur continuously the result is volcanic or harmonic tremor. Mount St. Helens exhibit these long period earthquakes months in advance of 1980's eruption. The volcanic tremor can be used to warn of an impending eruption allowing people living near the volcano can to be evacuated to safer areas.