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Indonesia rests on a series of fault lines that make the archipelago nation one of the most world’s most earthquake-prone. A quake last year killed more than 1,000 people on Sumatra, but a 7.7 quake last month in the same area caused only minor damage.
1. Earthquake “The Toba, of North Sumatra”
Toba earthquake is of volcanic earthquakes and classified as the largest earthquake in the history of the earth’s Happening in North Sumatra about 450,000 years ago. Volcanic earthquakes are the result of magma activity, which usually occurs before the volcano erupted. If the higher activeness will cause an explosion that also will cause an earthquake. The earthquake magnitude was estimated about 7-9 MSR.
Embossed effects of this earthquake is the creation of lake toba. The experts think if formerly sumatera a plateau, and lake toba volcanic earthquake occurred due. when there is continuous rain, and the result of volcanic debris that could cause the water is absorbed, so there toba lake like this.
Recent Sumatra earthquakes precursor to probable mega Volcano in 2012 that can end human civilization
According to computer models, somewhere near Toba, along the fault line there may be another super volcano getting ready for eruption. 3.1 mile sinking of Indo-Australian plate under the Euresian Plate in the last 74,000 years has created enough magma for a super volcano.
The recent series of volcanoes in that area have increased the level of alarm. Some of the quakes mistaken as aftershocks were harmonic tremors signifying lava movements. If Toba or along Toba the volcanic eruption take place, it can bring the human civilization to its knees. This has the potential 3000 cubic Kilometer of eruption. That can be so devastating that earth may experience a drop in temperature of 30degrees Fahrenheit for many years. It can actually larger than the one Toba experienced 74,000 years back.
Simultaneous Terrestrial and Solar polar reversal in 2012 accompanied by recent tectonic movement as well as harmonic tremor in the area shows high probability of a mega volcano in 2012 in that area.
74,000 years ago, a large section of the Indonesian island of Sumatra exploded in one of the biggest volcanic eruptions of the past 2 million years. The global environmental impact of the ash and gas clouds from this ‘super-volcano’ – known as Toba – is considered by some scientists to be the most catastrophic event the human species has ever endured.
But did we face extinction? What happened to the world’s climate? And how did Toba shape human evolution? This website describes the work of an international team of researchers investigating these questions. Using archaeology, genetics, geology, volcanology and climate modeling, this team is unraveling for the first time the full fascinating story behind the Toba super-eruption.
Originally posted by Nidwin
Was this 7.2 quake registered as tectonic or volcanic?
At the depth it occured and at that location It's most likely tectonic and not volcanic. My guess of course.
Toba is composed of three big separated magma chambers. Those three chambers together have been estimated by one scientist, years ago, to have a volume of 33 000 km3 of magma (it is beleived YS has a reservoir of 25 000 km3). An earthquake could fissure or made one of the walls separating the magma chambers collapse and make the pressure build in one of the chambers but till now no quake around there has done this.
The eruption 72 000-74 000 years ago didn't reach the 1000 km3 erupted magme (VEI 8 = 1000 km3), it was a bit less so in some way it was not a super eruption.
And its most recent eruption, about 75,000 years ago, was in Volcanic Explosivity Index of 8
The Young Toba Tuff has an estimated volume of 2,800 cubic kilometers (km) and was erupted about 74,000 years ago. The Huckleberry Ridge Tuff, erupted at Yellowstone 2.2 million years ago, has a volume of 2,500 cubic km. The Lava Creek Tuff, erupted at Yellowstone 600,000 years ago, has a volume of 1,000 cubic km. The May 1980 eruption of Mount St. Helens produced 1 cubic km of ash. Not shown in the diagram, is the Fish Canyon Tuff of the San Juan Mountains of Colorado. The Fish Canyon Tuff was erupted 27.8 million years ago and has an estimated volume of 3,000 cubic km.
The volume of the youngest eruption is estimated at 2,800 cubic km, making the eruption the largest in the Quaternary. Pyroclastic flows covered an area of at least 20,000 square km. Up to 1200 feet (400 m) of Young Toba Tuff is exposed in the walls of the caldera. On Samosir Island the tuff is more than 1800 feet (600 m) thick. Ash fall from the eruption covers an area of at least 4 million square km (about half the size on the continental United States).
Originally posted by dragnet53
So we mankind have survived these things before.
An alternative interpretation of Wadati-Benioff zones is therefore that they are primarily thrust/reverse faults. They represent the deformation interface between the subsiding ocean crust and mantle and the sometimes uplifting island arc/continental region, and provide conduits for the release of mantle fluids and seismic and thermal energy. They may have originated as cooling cracks in Precambrian time, but were rejuvenated and assumed their present configuration after deep oceans began to form in the Mesozoic. Deep-sea drilling has revealed that the Pacific Ocean subsided by an average of 4 km during Mesozoic–Cenozoic time. It is also noteworthy that rapid subsidence of the Pacific trenches in the Plio-Pleistocene has gone hand in hand with the rapid uplift of neighboring mountain ranges.