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Tambora volcano, Indonesia was raised to level 2 alert (waspada) on 5th April 2013 after an increase in seismic activity.
The explosion is estimated to have been VEI 7. It had roughly four times the energy of the 1883 Krakatoa eruption, meaning that it was equivalent to an 800 Mt (3.3×1012 MJ) explosion. An estimated 160 km3 (38 cu mi) of pyroclastic trachyandesite was ejected, weighing approximately 1.4e14 kg (3.1×1014 lb) (see above). This has left a caldera measuring 6–7 km (3.7–4.3 mi) across and 600–700 m (2,000–2,300 ft) deep. The density of fallen ash in Makassar was 636 kg/m² (130.3 lb/sq ft). Before the explosion, Mount Tambora was approximately 4,300 m (14,100 ft) high, one of the tallest peaks in the Indonesian archipelago. After the explosion, it now measures only 2,851 m (9,354 ft).
The 1815 Tambora eruption is the largest observed eruption in recorded history (see Table I, for comparison). The explosion was heard 2,600 km (1,600 mi) away, and ash fell at least 1,300 km (810 mi) away. Pitch darkness was observed as far away as 600 km (370 mi) from the mountain summit for up to two days. Pyroclastic flows spread at least 20 km (12 mi) from the summit. Due to the eruption, Indonesia's islands were struck by tsunami waves reaching a height of up to 4 m (13 ft).
Tambora volcano in Indonesia has been raised to level 2 alert (out of maximum 4) on 30th August 2011 after an increase in volcanic earthquakes. Alert level 3 was issued on 8th September 2011. In April 2011 there were 37 shallow volcanic earthquakes recorded, 167 in May, 277 in June, 363 in July, and 141 from 1-29 August. Continuous tremor was recorded on 29 and 30 August. Tourists and locals are advised to avoid the summit area of Tambora volcano.
Tambora erupted in 1815 killing 92 000 people making 1816 the year without a summer as the global climate effects were felt. Aerosols from the Tambora eruption blocked out sunlight and reduced global temperatures by 3 deg C. Europe missed a summer, and India had crop failures following the Tambora eruption. 100 cubic km of magma was erupted. Ten thousand people were killed immediately from the pyroclastic flows and the eventual toll due to starvation and disease may have been as high as 117,000. The eruption caused a tsunami with a wave height of 10 m.
Originally posted by OmegaLogos
This SCARES me MORE than the Yellowstone national park super volcano!
Originally posted by angelchemuel
I'm pretty certain that the magma chamber under Tambora was found recently to be bigger than /yellowstone. I'll go looksee if I can find the report.