Submission + - Could Nepal earth quake be twice as big? (qz.com)
Amidst the destruction, there was a spat on the issue between the US and China. The US Geological Survey (USGS), which monitors earthquakes worldwide, reported that the Nepal earthquake measured at a magnitude of 7.8. However, the China Earthquakes Network Center (CENC), which hopes to provide a similar service, measured the same earthquake at a magnitude of 8.1
While a difference of 0.3 in the magnitude of the seismic activity may not seem like much, the apparently small differences in magnitudes of earthquakes reported by different agencies around the world are, in real-life, huge. Because if we are to believe the Chinese data, the Nepal earthquake may have been twice in size than if we believe the US data
So who is correct?
There isn’t an independent body that can verify which of the two data points we should believe. Also, the discrepancy may be due to using different parameters in measurement: USGS uses moment magnitude and CENC uses surface-wave magnitude