![]() This event showed a small amount of activity gathering, or nucleating, in a central area below the surface. Nine days later, the instruments recorded a long-duration, very low-frequency process, normally only seen in deep subduction zones. In 2015, Tape installed 13 seismic stations in the Minto Flats of central Alaska to capture the area's fault activity. These new observations contribute toward understanding the physics of earthquakes." This study reports the first observations of a slow process that transitions into an earthquake - something previously observed only in laboratory experiments. "A fault zone in central Alaska monitored by new scientific instruments offers a look at a more complex process. "Most earthquakes start abruptly, but not always," said Luciana Astiz, a program director in the National Science Foundation's Division of Earth Sciences, which supported the research. Instead, their waves occur on much lower frequencies. Very low-frequency earthquakes do not have such signals. Typical earthquakes have two associated energy waves, called the P and S waves. The activity included a phenomenon known as very low-frequency earthquakes, referring to the type of energy waves associated with it. Tape and his colleagues found evidence for accelerating activity before a 2016 earthquake in a laterally moving fault zone in central Alaska. ![]() ![]() "Our observations have recorded an unequivocally interesting sequence of events," Tape said. ![]()
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