The Vietnamese Consulate General said it contacted local authority for information.
The Ministry of Foreign Affairs has requested the diplomatic office to keep a close watch on the situation and be ready to protect rights of Vietnamese citizens if necessary.
Every Vietnamese can contact the Consulate General of Vietnam in Osaka via hotlines – 0081-80-4638-6139 or 0081-90-2709-2009 – or email: firstname.lastname@example.org.
The powerful earthquake hit Osaka and other parts of Japan's second-largest metropolitan area on June 18 morning, leaving at least three people dead and more than 300 injured, according to Kyodo News.
The tremor did not trigger a tsunami but briefly left around 170,000 houses in the Osaka region without power and cause blazes. It also suspended train operation during the morning commuting hours and disrupted operation of many companies.
The earthquake registered up to a lower-6 on the Japanese seismic intensity scale of 0 to 7, meaning it is hard to stay standing. It caused violent shaking due to its shallow depth of 13km, the new agency said.