A Japanese national flag flies outside the Bank of Japan (BOJ) headquarters in Tokyo, Japan, on Sept. 27, 2021. (Photographer: Toru Hanai/Bloomberg via Getty Images) TOKYO (AP) - A powerful earthquake registering a preliminary magnitude 6.1 shook the Tokyo area on Thursday night, but officials said there was no danger of a tsunami.The Meteorological Agency said the quake was centered in Chiba prefecture, just east of Tokyo, at a depth of 80 kilometers (48 miles).It caused buildings to sway but there were no immediate reports of damage or injuries.NHK public television showed a sign hanging from the ceiling in its office swaying violently.