IRIDeS NEWs

2016.4.25

Oblique slip deep underground, strike-slip fault and normal fault running parallel approximately two kilometers apart on surface – may be the first case of slip partitioning in Japan- (Professor Shinji Toda, Assistant Professor Shinsuke Okada [IRIDeS], Assistant Professor Daisuke Ishimura [Tokyo Metropolitan University], Ms. Haruka Yoshida [Yame High School, Fukuoka Prefecture]) (vol. 11)

After the urgent field survey from April 15, Professor Shinji Toda, together with other researchers, went to Kumamoto again to continue their research from April 22 to 25. As a result, a normal faulting rupture was also discovered in the Futagawa fault zone, and it indicates that an oblique slip occurred deep underground but a strike-slip fault and a normal fault running parallel approximately two kilometers apart on the earth’s surface were identified.   According to the survey and analysi…

2016.4.22

Tohoku University DMAT carried out medical assistance in the regions affected by the 2016 Kumamoto Earthquake (Assistant Professor Hiroyuki Sasaki) (vol. 10)

Responding to the 2016 Kumamoto Earthquake, Tohoku Block DMAT has been carrying out medical assistance in the areas affected by the disaster. Assistant Professor Hiroyuki Sasaki of IRIDeS went to the site as a member of Tohoku University Hospital DMAT (disaster medical assistance team) which is one of the teams in Tohoku Block DMAT, and took part in activities from April 17 – 19.   DMAT is a team of medical professionals, consisting of doctors, nurses and logistics experts who have gone thr…

2016.4.21

The 2016 Kumamoto Earthquake: mechanism of aftershocks is rationally explicable, continue to be cautious (Professor Toda) (vol. 9)

Professor Shinji Toda, an expert on active faults in IRIDeS, calculated stress changes (changes in deformation before and after earthquakes) in the surrounding regions and faults after the magnitude 6.5 and 7.3 earthquakes, to find out the mechanism behind aftershocks which have been striking a wide area since April 16. In the figures below, stress is increasing in areas that are marked red, meaning fault activity may be induced, while regions marked in blue are places where stress is decreasing…

2016.4.18

Follow-up on identification of surface earthquake fault within Hinagu fault zone (Professor Toda, Assistant Professor Okada) (vol. 7)

In this field survey, it became clear that from the magnitude 7.3 earthquake on April 16, surface earthquake faults were identified along part of the Futagawa fault zone and in the northern part of the Hinagu fault zone, emerging on the surface.   During the survey, a maximum of approximately two meters right-lateral strike-slip in the Futagawa fault zone was measured, while in the northern section of the Hinagu fault zone, a maximum of approximately 50 centimeter right-lateral strike-slip …

2016.4.17

The 2016 Kumamoto Earthquake: a new surface earthquake fault identified in Mifune Town, Kumamoto Prefecture (Professor Shinji Toda, Assistant Professor Shinsuke Okada) (vol.6)

During the emergency field survey of the International Research Institute of Disaster Science, Tohoku University, on April 17, the research team identified an area where a surface earthquake fault has appeared within the Hinagu fault zone, with a right-lateral strike-slip of approximately 25 centimeters in Takigawa, Mifune Town, Kamimashiki-gun, Kumamoto Prefecture. It seems that this rupture emerged at the magnitude 7.3 earthquake in predawn on April 16 (according to the landowner). Also, there…

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