9 Sep 11 – Indonesia’s Tambora volcano was raised to level 3 alert yesterday – the 3rd step on the emergency alert level that counts only four levels – after two days of continuous tremors.
The volcano had been raised to level 2 alert just eight days earlier after an increase in volcanic earthquakes.
“Seismic activity has continued to increase, particularly in the register of volcano-tectonic shocks linked to the phenomena of fracturing accompanying migration of fluids,” the Volcanological Survey of Indonesia (PVMBG) announced today.
“The matter is serious and deserves to be followed,” PVMBG added.
Tambora’s cataclysmic eruption in April of 1815 was the most powerful eruption in recorded history and lowered global temperatures by as much as 3 degrees °C.
A year after the eruption, most of the northern hemisphere experienced sharply cooler temperatures during the summer months.
In parts of Europe and in North America, 1816 was known as “the year without a summer.”
In June 1816, most of New England was gripped by a cold front with snow falling in Albany, New York, and Dennysville, Maine. The cold continued for at least three months. Snow 30 centimetres (12 in) deep accumulated near Quebec City from the 6th to the 10th of June 1816.
Crops failed and livestock died in much of the Northern Hemisphere, resulting in the worst famine of the 19th century.
The death toll was at least 71,000 people (the most deadly eruption in recorded history), of whom 11,000–12,000 were killed directly by the eruption. Most deaths from the eruption were from starvation and disease.
The explosion was heard on Sumatra island (more than 2,000 km (1,200 mi) away).
Thanks to Emmanuel Robert for this link
“Will 2012 be the next without-summer year?” asks Emmanuel.