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 context of the scenario: convergent boundaries involve tectonic plates colliding, which can produce high-magnitude earthquakes. However, if the intensity is low, it means that the effects of the earthquake (such as damage observed) were minimal, possibly due to factors like the distance from the epicenter or the type of ground materials.