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Notification

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Nankai Trough Earthquake Temporary Information （ Survey Completed ）.

Nankai Trough Earthquake Temporary Information （ Investigation Completed ）

■ Date and Time ： 23:45, January 13, 2025
■ Summary ：

This earthquake did not meet any of the conditions indicated in the Basic Plan to Promote Earthquake Preparedness in the Nankai Trough. The earthquake did not meet any of the conditions indicated in the Basic Plan for the Promotion of Nankai Trough Earthquake Disaster Prevention Measures, and was not a phenomenon that could be considered as a relative increase in the likelihood of a Nankai Trough earthquake compared to normal conditions. However, it is important to note that an earthquake could occur at any time, and it is important to ensure that preparations for earthquakes are implemented on a daily basis.



Today （ 13th ） A magnitude 6 ． 9 earthquake occurred at 21:19 with its epicenter in the Hyuga Sea. Subsequent seismic activity has remained active.

The Meteorological Agency held an extraordinary meeting of the Evaluation and Study Group on Earthquakes along the Nankai Trough to discuss the relationship between this earthquake and the Nankai Trough earthquake.

This earthquake was evaluated to be a reverse fault type earthquake with a pressure axis in the west-northwest ・ east-southeast direction, with a moment magnitude of 6 ． 7, caused by a partial shift of the boundary between the land plate and the Philippine Sea plate in the assumed hypocenter region of the Nankai Trough earthquake. The earthquake was evaluated to be a moment magnitude 6 7 earthquake. Since the moment magnitude of the earthquake was less than 7 ． 0, it did not meet any of the conditions specified in the Basic Plan for the Promotion of Nankai Trough Earthquake Disaster Prevention Measures, and was not a phenomenon that is considered to have increased the likelihood of a Nankai Trough earthquake relative to normal conditions.

However, a large-scale earthquake along the Nankai Trough （ magnitude 8 to 9 class ） has a 70 to 80% probability of occurring within the next 30 years even under "normal conditions," and the Showa Tonankai Earthquake ・ has already occurred about 80 years after the Showa Nankai Earthquake. The Showa Tonankai Earthquake is highly imminent, as it has already been about 80 years since the Showa Nankai Earthquake occurred. Therefore, it is important to keep in mind that an earthquake may occur at any time and to ensure that preparations for earthquakes are implemented on a daily basis.

The JMA will continue to carefully monitor crustal activity along the Nankai Trough.

*Moment magnitude is the magnitude obtained by closely examining the scale of displacement of the epicenter fault. It may be different from the magnitude reported by the Japan Meteorological Agency in earthquake information.
*The Evaluation and Review Committee is working together with the existing Tokai Region Earthquake Disaster Prevention Measures Enhancement Area Judging Committee.


Whenever new changes are observed, the Evaluation and Review Committee will be held and information will be announced.


[Distributed by]
Funabashi City Emergency Management Division

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  • [Registrant]船橋市
  • [Language]日本語
  • Posted : 2025/01/13
  • Published : 2025/01/13
  • Changed : 2025/01/13
  • Total View : 29 persons
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