The Japanese authorities have issued a mega-earthquake warning for some parts of the country.An insurance industry expert commented that if the Japanese authorities have already issued an earthquake or tsunami warning, travel insurance will not cover such conditions that are expected or have already occurred, and travellers who take out travel insurance after the warning has been issued will not be covered.Related NewsDaiwa: Top Picks in CN Internet Sector Are Alibaba/ Tencent/ Trip.com Group/ PDD/ OthersThe expert added that because of the warnings issued, earthquakes are a "known risk" to insurers and may not be covered if travellers still travel and are caught in an earthquake. As for how long the "risk" lasts, it depends on when the local authorities announce the lifting of the earthquake threat.