SUMATRAN EARTHQUAKES IN APRIL WERE PART OF TECTONIC PLATE BREAKUP
Admin - LA Times
Most great earthquakes occur along plate borders, where one plate dives beneath the adjoining plate and sinks deep into Earth’s mantle, a process called subduction. The April 11 quakes, however, occurred in the middle of the plate and involved a number of strike-slip faults, meaning the ground on one side of the fault moves horizontally past ground on the other side. Scientists say the 8.7 main shock broke four faults. The quake lasted 2 minutes and 40 seconds — most last just seconds — and was followed by a second main shock, of magnitude 8.2, two hours later. Unlike the magnitude 9.1 temblor that struck in the same region on Dec. 26, 2004, and created a deadly tsunami, the April 11 quakes did not cause similar destruction. That’s because horizontally moving strike-slip faults do not induce the massive, vertical displacement of water that thrust faults do on the borders of plates.
The type of interplate faults involved in the Sumatran quakes are the result of monumental forces, some of which drove the land mass of India into Asia millions of years ago and lifted the Himalayan Mountains. As the Indo-Australian plate continues to slide northwest, the western portion of the plate, where India is, has been grinding against and underneath Asia. But the eastern portion of the plate, which contains Australia, keeps on moving without the same obstruction. That difference creates squeezing pressure in the area where the quakes occurred. The study authors say that over time, as more quakes occur and new ruptures appear, the cracks will eventually coalesce into a single fissure. “This is part of the messy business of breaking up a plate,” said University of Utah seismologist Keith Koper, senior author of one of the studies. “Most likely it will take thousands of similar large quakes for that to happen.” The quakes were also notable for triggering powerful aftershocks thousands of miles away.
Though major quakes have been known to trigger aftershocks at great distance, they are usually less than 5.5 in magnitude. The April earthquakes triggered 11 aftershocks that measured 5.5 or greater in the six days that followed, including a magnitude 7. Remote shocks were felt 6,000 to 12,000 miles from the main quakes. Fred Pollitz, a geophysicist with the U.S. Geological Survey in Menlo Park, Calif., and lead author of one of the studies, said the quakes were extremely effective in transmitting seismic wave radiation around the world. Though Pollitz said the magnitude of the larger Sumatran quake is No. 10 on the list of quakes since 1900, no other temblor has triggered so many strong aftershocks so far away. “It’s the most powerful earthquake ever in terms of capability of putting stress on other fault zones around the world,” he said.