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Yachiyo Disaster Prevention Information Mail （ Nankai Trough Earthquake Related Explanatory Information （ No.1 ） ）

August 09, 2024 15:30 Announced

[Summary]
A magnitude 7 ． 1 earthquake occurred at 16:43 on August 8 with its epicenter in the Hyuga Sea. With the occurrence of this earthquake, the possibility of a large-scale earthquake in the assumed epicenter area of the Nankai Trough earthquake was considered to be relatively higher than normal, so at 19:15 on August 8, we issued a Nankai Trough Earthquake Temporary Information （ Warning ） for a huge earthquake. Please continue to take disaster prevention measures in response to calls from the government and local governments.

[Text]
An earthquake of magnitude 7 ． 1 （ moment magnitude 7 ． 0 ） occurred at 16:43 on August 8, centered in the Hyuga Sea. Seismic activity near the epicenter of this earthquake has remained active since then.
The number of earthquakes of intensity 1 or higher observed in the assumed epicenter of the Nankai Trough earthquake from 16:00 on August 8 to 14:00 today （ September 9 ） （ The preliminary report ） is as follows.
8 times from 16:00 to 24:00 on the 8th （ Lower intensity 6 ： 1 time, intensity 2 ： 2 times, intensity 1 ： 5 times ）
6 times from 00:00 to 14:00 on the 9th （ Intensity 3 ： 1 time, intensity 2 ： 2 times, intensity 1 ： 3 times ）
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 an earthquake have been observed.

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 thus the Nankai Trough Earthquake Temporary Information （ at 19:15 on August 8, 2011 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 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.


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Yachiyo City Hall Emergency Management Division
Address ： 312-5 Owada-Shinden, Yachiyo 276-8501
TEL ： 047-421-6716
FAX ： 047-483-1094