Mount Spurr, the volcano on Anchorage's doorstep, is kicking up once again, the first time since it erupted 12 years ago, scientists said this week. Tiny earthquakes by the hundreds have been rumbling beneath the mountain across Cook Inlet from the city, according to the Alaska Volcano Observatory in Anchorage.

The observatory on Monday raised its official level of concern from Code Green, or "No eruption anticipated," to Yellow, meaning "An eruption is possible in the next few weeks and may occur with little or no additional warning."

Scientists hastened to say the earthquake swarm does not necessarily presage an eruption of Spurr, which blew its top three times in 1992 and, in the August '92 explosion, spread a thin, obnoxious layer of ash over Anchorage. "The most likely scenario," geophysicist John Power said, "is that the earthquakes will die off." That's what commonly occurs.

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