Yes it is true that in Eastern North America, large earthquakes occur.
In Eastern North America, the crust of the tectonic plates is thicker, older and stronger.
The crust of these plates is denser than the younger tectonic plates allowing more seismic energy to pass through them with greater frequency. If the object is denser, more energy waves pass through it. This phenomenon applies in the case of Eastern North America tectonic plates.
In general, the earthquakes in the eastern continent of America has high energy levels due to higher density, causing rapid motion or shaking of the earth's rigid layer and transmitting energy across large distances than in the western continent.
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