The table below links to diagrams displaying scaling factors needed to optimally fit long-period seismograms in the Global CMT algorithm.
Two different data types are considered: body waves with peak sensitvity between 50 and 75 seconds and mantle waves with peak sensitvity between 150 and 200 seconds.
Earthquakes larger than M=5.5 are included in the analysis. Standard time windows are selected, and corresponding synthetic seismograms calculated. For seismograms that have a correlation greater than 0.75, an optimal scaling factor (the factor by which the synthetic should be scaled to best match the observed seismogram) is calculated. A median scaling factor for each year is also calculated and displayed, together with limits for the two central quartiles.
The vertical scale saturates at a factor of 2 (or 1/2). Open annual symbols indicate saturated values, i.e., that the scaling required is greater than a factor of 2
