The volcanic eruption on a Spanish island and its aftermath could last for up to 84 days, experts said Wednesday. The Canary Islands Volcanology Institute said it based its calculation on previous eruptions on the archipelago, which like the latest eruption were followed by heavy lava flows and lasting seismic activity. Tuesday night saw a strong increase in the number of smaller eruptions that hurl rocks and cinders high into the air on the island of La Palma, one of the Canary Islands off northwest Africa. Authorities say that dangers still lie ahead for residents, including earthquakes, lava flows, toxic gases, volcanic ash and acid rain.