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Scientists fear another major quake may strike Indonesia JAKARTA - Seismologists say there is a heightened risk that a major earthquake may soon strike the western coast of Sumatra as a result of the monster quake that generated the December 26 tsunami. They warn that the Indonesian city of Banda Aceh, which was already badly hit by the killer wave, could be at risk from a quake measuring up to 7.5 on the Richter scale and there is a potential for a tsunami-making 8.5 quake offshore.
"There is no doubt, our calculations show a very significant increase on stress on two major active faults in the Sumatra region," seismologist John McCloskey at Britain's University of Ulster told AFP. Professor McCloskey says in so-called subduction zones, an earthquake can be swiftly followed by another one if certain geological conditions are met. "There is a very well established link between these stresses and following earthquakes," he said.
Professor McCloskey says that energy released by the December 26 quake has boosted stress in adjoining parts of two dangerous faults. One fault runs under land to the east of the December 26 quake and crosses the north-western tip of Sumatra. The other fault, known as the Sunda Trench, runs under the sea to the south, parallel to the coast, where two fatal tsunamis occurred in 1833 and 1861. "We are not trying to cry wolf," Professor McCloskey said.

"We can point to many other quakes where the stresses like the one we've measured have resulted in a following earthquake, and we are suggesting there is a significantly increased risk. "But we are also pointing out deficiencies in our knowledge, and we cannot say there will be an earthquake in the next year or whatever. At the moment, this science I believe doesn't allow us to make that statement."
In a study published in the British weekly science journal Nature, Professor McCloskey's team redraw the geological map of one of Earth's seismic hotspots after the 9.0 December 26 quake. The massive movement ruptured 250,000 square kilometres on a stretch of the Burma microplate, a narrow tongue of the Earth's crust that is jostled by the neighbouring Indian, Australian and Sunda plates. That seabed plunge, by as much as 20 metres, triggered the tsunami, killing more than 273,000 people in 11 nations on the northern rim of the Indian Ocean.
Part of the energy released by the quake was transferred to the contiguous fault sections. It distorted, compressed and deformed the rock, adding to the burden at known stress points and creating new ones. Several known episodes in seismic history point to the danger of an imminent follow-on earthquake in subduction zones when the interplay between two vast forces, of sliding and vertical stresses, is right.
Just a very small increase in pressure on these tensed parts of the Earth's crust can trigger a catastrophic rupture. In part of the Nankai Trough south-east of Japan, five of the seven large earthquakes of the past 1,500 years unleashed earthquakes in the fault's next section within the following five years, the study says. Another example is what happened in Turkey in 1999. A 7.4 earthquake in Izmit, south-east of Istanbul, was caused by the stresses of previous tremors on the Anatolian fault. In turn, this placed stress on the adjoining section of the same fault, unleashing a 7.1 quake at Duzce three months later.
The study points out that both of the Turkish quakes were the result of stresses that were far lower than the energy imparted by the December 26 event. Professor McCloskey says that even though scientific gaps remain about when the next big quake could strike, the heightened risk underscores the need to swiftly set up a tsunami early-warning system for the Indian Ocean. "When it comes to earthquakes, lightning does strike twice," he said.



Posted in Earthquake @ 17 March 2005 00:01 CET by Jeroen · 'Blog' RSS feed · permalink

indahnesia.com lists all earthquakes that occur in Indonesia. For your convenience we display them in a list and a Google Map. It is as accurate and recent as you can imagine as we check for updates every few minutes. If an earthquake occurs in Indonesia, this is the place to check it out in the first place.






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