As you know that Mw is related to released energy for specific earthquake, so why their recorded accelerations vary for the same distance and Mw for different seismotectonic regions?
Because PGA is very heavily dependent on the local geological conditions and configurations much more than the small differences in the distance.
Dear Ahmad,
in addition to the above answer you must consider also the difference in hypocenter depths: same Mw and same epicenters but different depths give different PGA, which add to the effect of different surface geological conditions.
Regards,
Lorenzo
Geophysical characteristics along the travel pathe and local topography may also play a role. Any correlations such as you mention will inevitably show a dispersion reflecting the influence of hypocentral depth, geophysical characteristics along the travel path, local geophysical conditions, and potentially topographical conditions around the site.
Dear friends,
I agree with you all. Your answers show that attenuation models are not good enough and can't predict PGA. Do you agree with this idea?
Comparing recorded and predicted values of PGA show a big error. I came to conclusion that we must build new methodologies for predicting ground motions parameters.
You may feel that my answer is unusual answer, but this is what i believe. Our currently used methodologies need to be changed and not to be corrected or calibrated.!!!!
regards
Because the recorded PGA in a given site depends not only on the magnitude but (source characteristics) but also the path and local site consditions (site effects).
Another effect can also play an important role when it comes to reverse fault. Indeed, the sectors on the hanging wall of the fault may exhibit greater acceleration equidistant from the epicenter than the areas on the overlapped compartment.
Another effect can also play an important role when it comes to reverse fault. Indeed, the sectors on the hanging wall of the fault may exhibit greater acceleration equidistant from the epicenter than the areas on the overlapped compartment.
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