From space, a very wide eruption column and shockwaves were captured propagating across the Pacific by satellites.[15] The pressure wave was measured by weather stations throughout New Zealand at a maximum amplitude of about 7 hPa.[16] The pressure wave was also recorded by weather stations in Australia.[17][18][19] The United States Geological Survey registered the eruption at a surface-wave magnitude of 5.8.[20] A pressure fluctuation of 2.5 hPa was measured in Switzerland.[21]