Dear Purushotham,
I don’t understand your question regarding a qualitative assessment. If most peaks are below 10 Hz, I suggest zooming in only on the frequency range of interest.
As discussed in the following forum topic: Oscillation in local axial wind component and AOA, loads in the rotating frame due to yaw error, shear, turbulence etc. show up as harmonics of the rotor speed (1P, 2P, 3P, etc.), but loads in the fixed frame show up as harmonics of 3-times the rotor speed (0P, 3P, 6P, etc.).
Best regards,