2008 Iwate-Miyagi Nairiku Earthqukae

• 2008.06.14 08:43

• Lat.N=38d 01.7m, Long.E=140d 52.8m

• Focal depth=8km

• Mjma=7.2

• Max Ijm=6 high

http://www.k-net.bosai.go.jp/k-net/topics/Iwatemiyaginairiku_080614/inversion/

Inversion of dislocation with records at NIED stations indicated by dark dotts. Red star is the epicenter

Location of stations, Blue circle indicates a station where the Max PGA of 4G was observed.

http://www.k-net.bosai.go.jp/k-net/topics/Iwatemiyaginairiku_080614/inversion/Figs/fig1.html

Aftershock locations with red circle and fault model with source mechanismsHi-net mechanism from head wave and F-net from wave form inversion

http://taro.eri.u-tokyo.ac.jp/saigai/iwate/index.html#A

Source inversion by tele-seismic observation

http://www.eri.u-tokyo.ac.jp/topics/Iwate2008/tectonics.html

Image of geological section with hypocenter

http://www.k-net.bosai.go.jp/k-net/topics/Iwatemiyaginairiku_080614/Iwatemiyaginairiku_080614_kyoshin.htm

Distribution of PGA and PGV

Comparison with an attenuation relation

http://www.k-net.bosai.go.jp/k-net/topics/Iwatemiyaginairiku_080614/IWTH25_NIED.pdf

Record of extremely large PGA of 4G

Record of same station but at bottom of borehole

http://www.kik.bosai.go.jp/kik/ftppub/sitepdf/IWTH25-J.pdf

Soil profile of the station

http://www.jishin.go.jp/main/chousa/08jun_iwate_miyagi/p11.jpg

Expected events for active faults,Epicenter is indicated with red circle.Lines are the active faults and dark circles are event epicenters.

http://www.gsi.go.jp/BOUSAI/h20-iwatemiyagi/080614siryou1.pdf

Dislocation observed by GPS

http://www.jishin.go.jp/main/oshirase/20080614_iwate_miyagi.htm

Active fault are indicated with red lines and epicenter is indicated with a yellow star.

http://www.jaxa.jp/projects/sat/alos/index_j.html

Satellite image with red cross for epicenterParts A and B are location where the representative land slides were occurred.

http://www.jaxa.jp/projects/sat/alos/img/topics_20080615_2l_j.jpg

Satellite images before (right) and after (left) the events A natural dam is existing in the left panel, so a lake appears.

Natural dam

Picture from Yomiuri Newspaper

http://www.jaxa.jp/projects/sat/alos/img/topics_20080615_3l_j.jpg

Satellite images before (right) and after (left) the events A largest land slide is existing in the left panel of 60,000,000m2

Volume of a land slide =1.2km×0.8km×50m 60,000,000m≒ 3

Picture from Mainichi Newspaper

Prof. Ohtsuki found fault trace for this event, sorry for all in Japanese

Fault rupture found by Prof Otsuki, Tohoku Univ.

http://www.chunichi.co.jp/article/feature/ntok0021/list/200806/CK2008061602000194.html