The correct statement about the earthquake is:
The earthquake was caused by plates moving together. It released a lot of energy, but the observer did not see much damage.
This is consistent with the characterization of convergent boundaries, where tectonic plates move toward each other and can cause high-magnitude earthquakes. The intensity reported refers to the perception of shaking and damage, which can vary based on distance from the epicenter, local building structures, and other factors even if the earthquake released significant energy.