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Notification

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Nankai Trough Earthquake Related Explanatory Information （ No.3 ）.

August 11, 2024, 15:30


An earthquake of magnitude 7 ． 1 （ moment magnitude 7 ． 0 ） occurred at 16:43 on August 8, 2024, centered 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 （ 11th ） The preliminary （ values ） are 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 ）
1 time from 00:00 to 12:00 on 11th （ intensity 3 ： 1 time ） Also, at strain stations, step-like changes associated with a magnitude 7 ． 1 earthquake have been observed, but so far no changes other than those normally seen after earthquakes have been observed. Deep low-frequency earthquake in the Kii Peninsula （ Microtremors ） associated with the activity have been observed in nearby strain gauges and other instruments, but this is a phenomenon that has been seen repeatedly 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 so at 19:15 on August 8, Temporary Information on Nankai Trough Earthquake （ 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 upon feeling a tremor for one week after the earthquake on August 8. Please continue to take disaster prevention measures in response to 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 for around 15:30 on the 12th.
We will announce any new changes as they are observed.


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  • Posted : 2024/08/11
  • Published : 2024/08/11
  • Changed : 2024/08/11
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