Soufrière Hills century in Montserrat. When pyroclastic flows and mudflows began occurring regularly, the capital, Plymouth, was evacuated, and a few weeks later a pyroclastic flow covered the city in several metres of debris. The first phreatic explosion in this new period of activity occurred on 21 August 1995, and such activity lasted for 18 weeks until it caused an andesitic lava dome formation. This was initially confined by a sector-collapse scar. This period lasted for another 60 weeks, after which there were major dome collapses and two periods of explosive volcanic eruptions and fountain-collapse pyroclastic flows. The explosion blanketed Plymouth, away,
Basse-Terre Island 16 communes (municipalities). The population density was . The largest city on Basse-Terre Island is the city of Basse-Terre which had 37,455 inhabitants in its urban area at the 2006 census. The city of Basse-Terre is the prefecture (capital) of Guadeloupe. Despite its name, Basse-Terre Island (literally "Low Land" Island, "Down Land" Island) is the highest island of Guadeloupe, rising to above sea level at the Soufrière volcano. The name of the island is the result of French terminology used in the Caribbean in the 17th century. In the Caribbean, the prevailing winds blow from the northeast (see trade wind),