Seismograph Picks Up Rhythmic Tremor, Turns Out to Be Graduate Student's Subwoofer

A harmonic tremor detected by the seismographic network around Mount Rainier, which briefly prompted the USGS to elevate the volcano's threat level from Normal to Advisory, has been traced to a graduate student's subwoofer in a basement apartment 400 meters from the nearest monitoring station. The signal, which appeared on seismograms as a low-frequency, rhythmically regular tremor at approximately 40 Hz, was initially interpreted as magma movement within the volcanic conduit — a potential precursor to eruptive activity. 'The frequency was consistent with what we'd expect from fluid-driven oscillation in a magmatic system,' said USGS seismologist Dr. Grace Waveform. 'It was also consistent with someone playing Daft Punk's Around the World on repeat at extremely high volume. We did not initially consider the second possibility.' The threat level was elevated for approximately four hours before a field team dispatched to inspect the closest seismic station noticed 'a pronounced bass emanation' coming from a nearby rental property. Investigation revealed graduate student Kyle Richter, 24, was testing a new 15-inch subwoofer he had purchased for 'an immersive listening experience.' 'I was calibrating it,' Richter said. 'I didn't know I was calibrating a volcano alert too.' The USGS has downgraded Mount Rainier back to Normal and issued a corrective bulletin noting that 'the anomalous tremor was anthropogenic in origin and posed no volcanic hazard.' The bulletin did not name Richter but described the source as 'a residential audio device operating at seismically detectable amplitude.' Dr. Waveform has recommended that future monitoring protocols include 'a preliminary check for nearby consumer electronics' before elevating threat levels. Richter has been asked to turn down his subwoofer. He has agreed to use headphones 'during peak monitoring hours.'