Experts say a major tsunami warning may have indirectly contributed to a massive fire that broke out in central Japan's quake-hit Wajima City, as it prevented residents from tackling the blaze at an early stage.

The fire started in central Wajima after a powerful earthquake struck on New Year's Day. The city is located in Ishikawa Prefecture. The blaze gutted more than 200 houses and stores in an area that spans about 48,000 square meters.

A group led by University of Tokyo Professor Hiroi Yu surveyed the damage on Saturday. Hiroi is an expert on quake-induced fires.

The group found charred propane gas canisters at the site. Professor Hiroi says the gas in the canisters may have ignited and caused an explosive blaze.

He believes the conflagration quickly spread through the wooden structures in the densely packed area that is known as Asaichi Street.

Hiroi's group also interviewed people who saw the fire.

They said initial firefighting efforts could not be carried out sufficiently, as the major tsunami warning had prompted residents to flee.

They also said firefighters who rushed to the scene could not use hydrants, as water supplies had been cut off.

Professor Hiroi says the case illustrates the things that can go horribly wrong when an earthquake induces a fire. He says measures aimed at minimizing damage should be incorporated into future disaster-prevention programs and reconstruction plans.