The table below links to diagrams displaying scaling factors needed to optimally fit long-period seismograms in the Harvard CMT algorithm.
Three different data types are considered: mantle waves with Three different data types are considered: body waves with peak sensitvity between 50 and 75 seconds, mantle waves with peak sensitvity between 200 and 250 seconds, and surface waves with peak sensitvity between 50 and 75 seconds.
Earthquakes larger than M=6.5 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
A -P following the channle name (e.g., LHZ-P) indicates the primary sensor; -S indicates the secondary sensor
