In my case study, both earthquakes in the same location, but different focal mechanism. I seen that normal fault has higher ground motion amplitude than reverse fault.
1- It is some odd that you seen two focal mechanism in same area because the focal mechanism is related to tectonic regime that is a regional phenomena (excepted in Pull-Apart area in a Compression regime). So, this is very rare case you seen in a same area.
2- Earthquakes can be Individual because the the involved volume of rock mass in a earthquake may differ with other earthquakes, results in difference in many characteristics of propagated waves.
3- You didn't present at least some data about magnitude of earthquakes in your case and at least type of regional tectonic regime.
I suggest you to use a code able to compute synthetic seismograms, in order to compare your recordings to the synthetics.
An excellent code, as based on normal-modes theory, it belongs to Dr. Rongjiang Wang from GFZ Potsdam. It should be available by request.
The synthetics are accurately matching the observations for signals with wave period around 1 s and greater.
Thank you for the answer Mr. Reza Hosseini, in my case, in the similar magnitude and tectonic regime on subduction zone
Thank you for the suggestion Prof Marian Ivan, maybe I have to compute synthetic seismogram independently
Amplitude readings are dependent on the magnitudes of both events and the location of your station relative to the radiation pattern and differs for the P and S wave. I attached a figure showing the radiation patterns for body waves and a double couple mechanism.
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