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...Q: Why didn't last week's earthquake cause a massive tsunami? A: The earthquake ruptured some 30 km below the ocean floor, significantly deeper than the Dec. 26 quake, which was only 10 km deep and in shallower waters. All that earth muffled the force of last week's quake and kept the seafloor from rising suddenly, which could have triggered a major tsunami. "There just wasn't a big enough bulge in the water to create a big set of waves," says Kerry Sieh, a seismologist at the California Institute of Technology. Some minor tsunami waves were generated...
...Q: Is this quake an aftershock of the one that caused the Dec. 26 tsunami? A: Technically, it could be classified as an aftershock because it occurred three months later and its epicenter was just 190 km away from that of the first quake. But while the Dec. 26 earthquake ruptured the earth in a line that extended more than 1,100 km to the north of its epicenter, the force of the March 28 temblor broke in the opposite direction, rupturing a 400 km stretch of seafloor to the southeast. Because its energy spread in a new direction...
...Q: How would it have been influenced by December's quake? A: A major earthquake alters the tectonics of an entire region, relieving pressure in some areas and increasing it in others. As Professor John McCloskey and his team at the University of Ulster showed in a recent paper in Nature, the Dec. 26 quake intensified the stress on two nearby faults that are close to the epicenter of the March 28 temblor: one running directly beneath the city of Banda Aceh and one running beneath the Sunda Trench, a deep seam in the ocean floor. That additional stress...
...Q: Have these two earthquakes finally relieved the region's tectonic stress? A: Don't bet on it. The area off the coast of Sumatra is a subduction zone, a highly unstable region where the India Plate, the Australia Plate, the Sunda Plate and the Burma Micro-Plate collide and dive beneath one another. Earthquakes tend to occur in clusters in subduction zones, and McCloskey says his initial findings indicate that the latest quake has accentuated the stress along the Sunda Trench fault for another 300 km south. The result is like the steady growth of a crack...
...Andrew Q. Jing ’08, who attended the speech, said he questioned whether France is really selling arms to be consistent...