Aftershocks of "The 2011 off the Pacific coast of Tohoku Earthquake" have been very active. As of 15:10JST 14 March, the aftershocks larger than magnitude 7.0 occurred 3 times, and those larger than 6.0 occurred 44 times. The aftershocks have occurred in the large area off the coast of Iwate, Miyagi, Fukushima, and Ibaraki Prefectures. When compared to past cases, the activity of aftershocks is very high.
- Near the epicenter, maximum JMA Seismic Intensity of aftershocks may be 5- or higher.
- A strong aftershock may occur tsunami. Be cautious when a tsunami warning or advisory is issued.
- Estimating from the occurrence of aftershocks so far, the possibility of aftershocks with maximum JMA Seismic Intensity of 5+ or higher is 40% for the 3-day period from 2 p.m., 14 March, followed by 20% for the 3-day period from 2 p.m., 17 March to 2 p.m., 20 March.
Responsible national organization and the source of information: Japan Meteorological Agency (JMA)