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Very large seismic events with a magnitude of 7 or greater occur approximately once every two or three years . Aftershocks continued to rattle Vanuatu , with an earthquake the following day reaching a magnitude of 6.6 . On March 28 , the area was rocked by another powerful earthquake , measured at a magnitude of 8.7 , but a large tsunami failed to materialize . He stated that " we believe the magnitude of the problem is now such that fee withholding may be crippling the ability of the PTO to provide high quality professional examination and prompt patent and trademark processing . The largest earthquake had a magnitude of ML = 2.2 and was located 1 km southeast of Great Sitkin Volcano at a shallow hypocentral depth . One major disadvantage with present value , compared to rate of return calculations , is that the magnitude of a discounted present value is generally proportional to the value of the educational investment and , thus , the return from one type of educational investment cannot be directly compared to another . Consider that magnitude of what was done . It is government 's funding of the industry in Canada that accounts for the major difference in the magnitude of the industry . The High Resolution Spectrograph was used to make spectral observations of the dwarf nova system T-Leonis , which usually has a visual magnitude of 15.5 but may brighten to a magnitude of 10.0 for outburst . The complexity and the magnitude of the effort may prove to be insurmountable . " Democrats energy spokeswoman Lyn Allison said the government had failed to grasp the magnitude of the threat posed by climate change .