For about five minutes, the earth shook strong enough. Parapat and Samosir Island residents scrambled out of the house. Those who happened to be on the edge of the lake to witness an unusual event.
Lake water is usually calm to form a vortex, Like a rushing river. Although not likely, not a few people suspect that there will be a tsunami from the middle of the lake.
What makes the water turbulent Toba?
When contacted, Head of Data and Information BMKG class I Polonia, Hartanto claimed not to know about the strange phenomenon. "We've heard it now. In theory, it could be caused by a powerful quake that hit Aceh region.
He added that last Wednesday's earthquake was very strong in North Sumatra, with a rather long duration, nearly five minutes. "Like the water in the bucket, if we shake he would move," he added.
What about the alleged upheaval associated water volcanic activity at the bottom of Lake Toba? Hartanto did not give an answer. "Please contact BBMKG Region 1 field, they are more fit to give information about this," he said.
Contacted separately, Head of Data and Information BBMKG Wil I Field, said Hendra Suwarta turbulent water in Lake Toba could have occurred because the epicenter was far from North Sumatra. For the vibration feels stronger. Meanwhile, at the base of the mountain about Toba, "The earthquake will not interfere with the activity of magma at the bottom of Lake Toba."
Hendra explained, rock layers that cover the Lake Toba magma thickness ranging from 30 to 40 kilometers. "This is the thickest layer of stone in Indonesia. He was hundreds of thousands of years. There is no problem about it," he said.
He also admitted he just heard vibrating the water of Lake Toba. "We will direct coordination with the region BMKG Parapat (Lake Toba), we also have an office there," said Hendra.
