The omission was corrected only after the Japan Sports Agency contacted the South Korean Embassy in Tokyo on Wednesday.
The new warning system will be based on foreshocks, which are small tremors that come right before a violent earthquake.
Russia did not appreciate President Donald Trump's vow to "totally destroy" North Korea, and has plans of its own to solve the nuclear crisis.
The temblor occurred near where an earthquake and a tsunami caused a nuclear meltdown six years ago.
North Korea has lashed out at U.S. regional allies South Korea and Japan for acting on Washington's behalf and undermining Kim Jong Un's nuclear ambitions.
German Foreign Minister Sigmar Gabriel said a war between the U.S. and North Korea could be worse than World War II.
Four U.S. Marine Corps’ F-35B Lightning II joined pilots from Japan and South Korea in a show of "ironclad commitment."
Taro Aso later issued a statement clarifying his position on Hitler’s crimes.
The Russian Defense Ministry claimed the TU-95 bombers took part in "scheduled flights over neutral waters."
Japan is a well-known mecca for exotic Kit Kat lovers, who have come to love the wasabi, sake and purple sweet potato flavors.
Japan is eyeing the deployment of the Aegis Ashore, a land-base missile defense system.
The drills went southwest of the Korean Peninsula following North Korea’s threats toward Guam last week.
The cylindrical-shaped object would most likely be U.S.-made.
Despite the U.S.'s deadly atomic bomb attacks on Japan during World War II, the two countries mostly see eye to eye on North Korea.
The comment from UN ambassador Nikki Haley comes as President Trump spoke by phone with Japan's Shinzo Abe.