Volcano Checkup

YELLOWSTONE still shaking one week after first tremor. The small earthquakes that began in the park a week ago continue. They include three more earthquakes Friday that measured stronger than magnitude 3.0. A quake of magnitude 3.5 happened at 11:30 a.m., followed by quakes measuring 3.2 and 3.1 at 12:40 p.m. and 1:15 p.m. Several hundred quakes centered under the north end of Yellowstone Lake have now occurred since last Friday. The strongest so far was a magnitude 3.9 quake last Saturday.

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