It has a visual apparent magnitude range of 5.6 to 10.
It has a magnitude range of 8-13.
It has a faint central star that is variable, with a magnitude range of 12 to 16.
However, that original scale is limited to California earthquakes within a certain magnitude range, and to seismographs used at that time.
The August 15th shock originated near the source of two previous earthquakes, both in the magnitude 8 range, which occurred in 1908 and 1974.
Recently the star has had an apparent magnitude range of about 6.9 to 8.
The periods are long, from about 80 days to over 600 days, and the magnitude ranges are much greater than with the Cepheids.
Estimates of its magnitude range from 8.5 to 9.0.
However, the magnitude range for Saturn also depends on its ring system as explained below.
Scientists now believe this fault line is active and capable of producing earthquakes in the 6.8 magnitude range.