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This text has been translated by auto-translation. There may be a slight difference between the original text and the translation. (Original Language: 日本語)
Notification
Yachiyo Disaster Prevention Information Mail ( Nankai Trough Earthquake Related Explanatory Information ( No.8 ) )
- [Registrant]八千代市役所
- [Language]日本語
- [Location]千葉県 八千代市
- Posted : 2024/08/22
- Published : 2024/08/22
- Changed : 2024/08/22
- Total View : 114 persons
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[Summary]
A magnitude 7 . 1 earthquake occurred at 16:43 on August 8, centered in the Hyuga Sea. Since the occurrence of this earthquake, no seismic activity or crustal deformation has been observed in the assumed epicenter of the Nankai Trough earthquake that would indicate any particular change in the plate boundary sticking conditions. Please keep in mind that a large-scale earthquake could occur at any time along the Nankai Trough, and continue to implement "daily earthquake preparedness.
[Text]
An earthquake of magnitude 7 . 1 ( moment magnitude 7 . 0 ) occurred at 16:43 on August 8, centered 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, and thus a Nankai Trough Earthquake Temporary Information ( Giant Earthquake Warning ) was issued at 19:15 on August 8, 2011.
Seismic activity near the epicenter of this earthquake was initially active, but has declined over time. However, in the past, an earthquake of similar magnitude has occurred in the Hyuga Sea a month and a half after the first earthquake.
The number of earthquakes of intensity 1 or greater that occurred in the assumed epicenter area of the Nankai Trough earthquake ( ) including the area around the epicenter of the August 8 earthquake ( ) from 16:00 August 8 to 12:00 today ( August 22 ) The following are preliminary
24 times from 16:00 August 8 to 24:00 August 15 ( 1 time, intensity 6 : 1 time, intensity 3 : 2 times, intensity 2 : 5 times, intensity 1 : 16 times )
0 time from 00 August 16 to 12:00 August 22
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 usually seen after earthquakes have been observed. Shallow very low-frequency earthquakes have been observed in the Hyuga-nada Sea and off the southeast coast of Kyushu since around 9:00 p.m. on August 8. This phenomenon has been observed repeatedly in the past, but further observation ・ research is needed to determine the frequency ・ magnitude, etc.
In addition, changes in pore water pressure in the boreholes off the Kii Peninsula have been observed since around August 5, which are thought to be caused by crustal deformation. This phenomenon has been observed repeatedly in the past.
Thus, after the August 8 earthquake, no seismic activity or crustal deformation has been observed in the assumed epicenter of the Nankai Trough earthquake that would indicate any particular change in the plate boundary sticking conditions.
As one week has passed since the earthquake occurred at 16:43 on August 8 with the epicenter in the Hyuga Sea, the government has terminated its "Call for Special Caution" as of 17:00 on August 15, following the announcement of the Nankai Trough Earthquake Temporary Information ( Giant Earthquake Warning ). The government's "Call for Special Caution" has been terminated.
Looking at past global examples, the likelihood of a major earthquake tends to be higher immediately after the first earthquake ( on August 8 ) and decreases as time passes, although there have been cases where a major earthquake occurred more than a week after the first earthquake. There have been cases of major earthquakes occurring more than a week after the first earthquake.
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 is highly imminent since about 80 years have passed since the Showa Tonankai Earthquake ・ occurred. It is a highly imminent situation.
A Nankai Trough earthquake may occur suddenly without any unusual phenomena being observed along the Nankai Trough.
Please keep in mind that a large-scale earthquake could occur at any time along the Nankai Trough, and continue to implement "daily earthquake preparedness".
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