J-RISQ Report

Estimated I_s for Major Cities

Max. Obs. I_s	Histogram of Estimated I_s 1 2 3 4 5- 5+ 6- 6+ 7	Municipality Show All Data	Daytime Population	Distance [km]
4		Okuma,Futaba,Fukushima	0	10
4		Hirata,Ishikawa,Fukushima	5,400	51
4		Tamura,Fukushima	34,000	47
4		Katsurao,Futaba,Fukushima	10	32
4		Motomiya,Fukushima	33,000	63
3		Futaba,Futaba,Fukushima	0	9
3		Miharu,Tamura,Fukushima	15,000	54
3		Kawauchi,Futaba,Fukushima	1,700	26
3		Ono,Tamura,Fukushima	9,600	43
3		Sukagawa,Fukushima	71,000	67
3		Naraha,Futaba,Fukushima	790	16
3		Furudono,Ishikawa,Fukushima	4,700	59
3		Nihommatsu,Fukushima	53,000	62
3		Ishikawa,Ishikawa,Fukushima	16,000	64
3		Iwaki,Fukushima	320,000	43
3		Kagamiishi,Iwase,Fukushima	12,000	69
3		Asakawa,Ishikawa,Fukushima	5,400	70
3		Koriyama,Fukushima	330,000	65
3		Namie,Futaba,Fukushima	130	14
3		Hirono,Futaba,Fukushima	4,400	22
3		Iitate,Soma,Fukushima	50	45
3		Shirakawa,Fukushima	60,000	84
3		Izumizaki,Nishishirakawa,Fukushima	7,700	76
3		Shinchi,Soma,Fukushima	7,200	55
3		Tamakawa,Ishikawa,Fukushima	5,600	64
3		Tenei,Iwase,Fukushima	4,800	77

The histogram shows frequency distribution of estimated I_s derived from interpolation of the observation with 250-m mesh. The daytime and nighttime correspond to 9:00-18:59 and 19:00-8:59, respectively. The distance is measured from the epicenter to the center of the municipality.

Major Historical Damaging Earthquakes in This Region

Year	Region	M	Damage
1938	Off Ibaraki	7.0	250 houses damaged in Fukushima. 1 depot collapsed in Ibaraki. A small tsunami was observed.
1938	Off Fukushima	7.5	Fukushimaken-oki Earthquake,1 dead, 4 houses and 16 non-residential houses collapsed in Fukushima. A 1 m high tsunami was observed.
1956	Southern Miyagi	6.0	1 dead near Shiraishi, 3 non-residential houses collapsed.
2003	Northern Miyagi	6.4	The inland crustal earthquake preceded by a foreshock (M5.6) and followed by an aftershock (M5.5) on the same day. 677 injured, 1,276 houses collapsed, 3,809 partially destroyed.
2011	Off Sanriku	9.0	2011 off the Pacific coast of Tohoku Earthquake,Mega-thrust earthquake in the subduction zone along the Japan trench from off the middle of Sanriku to off of Ibaraki. 19,418 dead, 2,592 missing, 6,220 injured, 121,809 houses collapsed, 278,496 partially destroyed (as of March 2016; including some damage by aftershocks and induced earthquakes). 90% of fatalities were drownings. Most of the damage including nuclear disaster was caused by a large tsunami (height of about 40 m, according to field investigation). Maximum Is was 7. The damage by ground motion was relatively less significant than that by tsunami.
2011	Off Miyagi	7.2	The intraslab earthquake with the reverse fault of the Pacific plate, occuring around the epicentral area of the 2011 off the Pacific Coast of Tohoku Earthquake. 4 dead, 296 injured, over 36 houses collapsed, over 27 partially collapsed. Maximum Is was 6+.
2011	Hamadori, Fukushima	7.0	The crustal earthquake with normal faults, induced by the 2011 off the Pacific Coast of Tohoku Earthquake. 4 dead, 10 injured (as of March 2016). Maximum Is was 6-.