![]() ![]() "This is a common phenomenon with earthquakes that travel long distances-for example, our stations might only register the very lowest-frequency signals from a large earthquake that happens in Japan or Chile," the USGS said. Meanwhile, it reached Long Valley a "few moments later with much of the high-frequency signal missing completely." The earthquake reached Shasta and Lassen at nearly the same time, but with fewer high frequencies the farther it traveled, according to the USGS. The USGS said the earthquake and its aftershocks are showing up "beautifully" on its monitoring technology They are continuing to monitor helicorder records and spectrograms to asses how the shaking manifests across distances. Other volcanoes monitored following the earthquake include Mount Shasta, Medicine Lake Volcano, Lassen Volcanic Center, Long Valley Volcanic Region, Coso Volcanic Field, and Ubehebe Craters.
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