Overview

• USGS and EMSC measured the quake at around 47 km deep, while India’s NCS reported a 50 km depth at 37.45°N, 141.52°E.
• The event occurred at 15:21 UTC on October 4, which was 00:21 local time on October 5.
• The offshore epicenter was about 56 km east of Tomioka and roughly 112 km east-southeast of Fukushima City.
• USGS issued a Green alert for shaking-related fatalities and economic losses, indicating a low likelihood of casualties or major damage.
• Exposure estimates suggest about 4.37 million people felt light shaking and approximately 28.79 million experienced weak shaking.