On January 15, 2022 at 04:15h UTC (05:15h Berlin time CET), an M 5.8 volcanic eruption occurred on Hunga Tonga–Hunga Haʻapai, an uninhabited volcanic island of the Tongan archipelago in the South Pacific Ocean. The eruption was one of the largest underwater volcanic eruption in recent times. The explosion was so massive it sent shockwaves around the world.

More than half a day later, the pressure wave was felt in Erlangen, first as a compression wave of amplitude 1.4 mbar at 20:32h CET and then as a decompression wave of amplitude -0.7mbar at 02:32h CET. The second wave traveled in opposite direction and took a few hours longer to reach Erlangen.

Pretty awesome our two simple pressure sensors can clearly detect volcanic events around the globe!