Due to free will, many causes of death are individual, but causes due to natural disasters are still under God's control.
The fatal injuries sustained in an earthquake are comparable to the fatal injuries in a car crash, domestic violence, street violence, work accident, attack of wild animal, sporting accident, self-inflicted injury, ingestion of poisonous substances ...
People die of such injuries every day, in great numbers.
A thousand fatal car accidents, violent murders or work accidents spread all over the country, or a thousand dead in an earthquake in a relatively small area - what exactly is the difference?