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Notification

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Nankai Trough Earthquake Related Explanatory Information （ No. 4 ）.

On August 12, 2024 at 15:30


An earthquake of magnitude 7 ． 1 （ moment magnitude 7 ． 0 ） occurred at 16:43 on August 8 with its epicenter in the Hyuga Sea. Seismic activity has remained active near the epicenter of this earthquake since then.
The number of earthquakes of seismic intensity 1 or higher that occurred in the assumed epicenter area of the Nankai Trough earthquake （ ） including the epicenter area of the August 8 earthquake from 16:00 on August 8 to 12:00 today （ ） The preliminary report ） is as follows.
8 times from 16:00 to 24:00 on the 8th （ Seismic intensity 6 ： 1 time, intensity 2 ： 2 times, intensity 1 ： 5 times ）
11 times from 00:00 to 24:00 on the 9th （ Seismic intensity 3 ： 1 time, intensity 2 ： 2 times, intensity 1 ： 8 times ）
2 times from 00:00 to 24:00 on 10th （ intensity 2 ： 1 time, intensity 1 ： 1 time ）
2 times from 00:00 to 24:00 on 11th （ intensity 3 ： 1 time, intensity 1 1 time ）
1 time from 00:00 to 12:00 on 12th （ Seismic intensity 1 ： 1 time ）
Also, at strain stations, step-like changes associated with a magnitude 7 ． 1 earthquake are being observed, but other than the changes usually seen after earthquakes, no changes have been observed so far. However, no changes other than those usually seen after earthquakes have been observed so far. Deep low-frequency earthquakes in the Kii Peninsula and Ise Bay （ Microtremors ） associated with the activity have been observed in nearby strain gauges and other instruments, but this is a phenomenon that has been repeated in the past.
Thus, after the occurrence of the earthquake on the 8th, no seismic activity or crustal deformation has been observed in the assumed epicenter area of the Nankai Trough earthquake that would indicate any particular change in the plate boundary sticking conditions.

As a result of studying the relationship between the August 8 earthquake and the Nankai Trough earthquake, the possibility of a large-scale earthquake in the assumed epicenter area of the Nankai Trough earthquake is considered to be relatively higher than under normal conditions, and therefore, at 19:15 on August 8, the Nankai Trough Earthquake Temporary Information （ A huge earthquake warning ） was issued.
The government is calling on the Nankai Trough Earthquake Disaster Prevention Promotion Areas to reconfirm their daily earthquake preparedness and be ready to evacuate immediately if they feel any tremors for a week after the earthquake on August 8. Please continue to take disaster prevention measures in response to the calls from the government and local governments.
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.



We will continue to announce the status of crustal activity and other information in the "Nankai Trough Earthquake Related Information. The next announcement is scheduled at around 15:30 on the 13th.
We will announce any new changes as soon as they are observed.


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  • Posted : 2024/08/12
  • Published : 2024/08/12
  • Changed : 2024/08/12
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