Figure 7. Comparison of the influence of bandwidth limit by using different frequency ranges (2-20Hz, 2-40Hz and 2-60Hz) for corner frequency estimation. (a) Comparison of individual event corner frequency inverted with different frequency ranges indicated by different colors. (b) Histogram of log10 corner frequency ratio between 2-20Hz and 2-60 Hz (red), and between 2-40Hz and 2-60Hz (blue). Red and blue vertical dashed lines show the mean values of both cases, and the black vertical dashed line is 0. (c) Corner frequency ratio between various methods and 2-60 Hz versus corner frequencies from 2-60 Hz. Red dots are 2-20 Hz and blue dots are 2-40 Hz. Median values (red and blue squares) are calculated from events with 2-60 Hz corner frequency between 2 and 100 Hz, a minimum of 5 earthquakes is required to calculate median values. Green squares are the median ratio using AS2007 results (2-20 Hz from surface network). Black horizontal dashed line indicates ratio of 1. Areas with different darkness represent corner frequencies outside of 2-20Hz, 2-40Hz and 2-60Hz. (d) Comparison of individual earthquake corner frequencies between this study and AS2007 (transparent black circles). Black dashed line represents where two studies are consistent and red represents where corner frequencies in this study (2-60 Hz) are 1.5 times of those in AS2007. The white area indicates the frequency limit in AS2007 (20Hz), the light gray area between the frequency limits of AS2007 (20Hz) and this study (60Hz), and the dark gray area higher than the frequency limit in this study (60Hz). The green dashed curve is the median of corner frequencies of AS2007 relative to those in this study (similar to the green line in figure c).