<span style="color: #222222;">An earthquake measuring 6.1 on the Richter scale struck Japan's northern island of Hokkaido on Tuesday.<br />''<br />''Japan Meteorological Agency said, tremors originated off Aomori's eastern coast at a depth of around 20 kilometers at 6:18 pm (0918 GMT). It said, affected parts include Hokkaido, Aomori and Iwate prefectures. Japanese media outlets have so far not carried any reports of damage or injuries. No tsunami warning has been issued so far. This is the second earthquake to have struck Hokkaido in over a month.</span><br />