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	Nighttime Population	Distance [km]
4		Morioka,Iwate	300,000	115
4		Takizawa,Iwate	56,000	120
4		Fudai,Shimohei,Iwate	2,800	45
4		Noheji,Kamikita,Aomori	13,000	137
4		Shingo,Sannohe,Aomori	2,400	112
4		Misawa,Aomori	40,000	109
4		Shizukuishi,Iwate,Iwate	17,000	129
4		Hirono,Kunohe,Iwate	17,000	67
4		Kitakami,Iwate	94,000	142
4		Hachimantai,Iwate	26,000	114
4		Hachinohe,Aomori	230,000	90
4		Shiwa,Shiwa,Iwate	32,000	121
4		Ninohe,Iwate	28,000	95
4		Nambu,Sannohe,Aomori	18,000	95
3		Yahaba,Shiwa,Iwate	29,000	120
3		Gonohe,Sannohe,Aomori	17,000	104
3		Noda,Kunohe,Iwate	4,200	49
3		Karumai,Kunohe,Iwate	9,300	84
3		Kunohe,Kunohe,Iwate	5,900	84
3		Oirase,Kamikita,Aomori	24,000	101
3		Hashikami,Sannohe,Aomori	14,000	77
3		Kuji,Iwate	36,000	54
3		Sumita,Kesen,Iwate	5,700	127
3		Ishinomaki,Miyagi	150,000	207
3		Oshu,Iwate	120,000	151
3		Tohoku,Kamikita,Aomori	18,000	119
3		Wakuya,Toda,Miyagi	16,000	205
3		Iwate,Iwate,Iwate	14,000	102
3		Higashidori,Shimokita,Aomori	6,600	159
3		Towada,Aomori	63,000	116
3		Miyako,Iwate	57,000	63
3		Kurihara,Miyagi	70,000	192
3		Shichinohe,Kamikita,Aomori	16,000	127
3		Sannohe,Sannohe,Aomori	10,000	102
3		Mutsu,Aomori	59,000	168
3		Kazuno,Akita	32,000	137
3		Tono,Iwate	28,000	113
3		Minamisanriku,Motoyoshi,Miyagi	12,000	177
3		Kamaishi,Iwate	37,000	101
3		Hanamaki,Iwate	98,000	135
3		Tome,Miyagi	82,000	187
3		Hiranai,Higashitsugaru,Aomori	11,000	153
3		Rokunohe,Kamikita,Aomori	11,000	107
3		Iwaizumi,Shimohei,Iwate	9,800	58
3		Sotogahama,Higashitsugaru,Aomori	6,200	182
3		Osaki,Miyagi	130,000	209
3		Takko,Sannohe,Aomori	5,600	109
3		Aomori,Aomori	290,000	161
3		Ichinoseki,Iwate	120,000	169
3		Kanegasaki,Isawa,Iwate	16,000	148
3		Yokohama,Kamikita,Aomori	4,500	146
3		Yamada,Shimohei,Iwate	16,000	80
3		Misato,Toda,Miyagi	25,000	207
3		Ichinohe,Ninohe,Iwate	13,000	95
3		Otsuchi,Kamihei,Iwate	12,000	92
3		Kuzumaki,Iwate,Iwate	6,400	82
3		Daisen,Akita	83,000	179
3		Nishiwaga,Waga,Iwate	5,900	163
3		Yokote,Akita	92,000	179
3		Ofunato,Iwate	38,000	127
3		Hiraizumi,Nishiiwai,Iwate	7,900	165

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
1856	Hidaka, Iburi, Watarishima, Tsugaru, Nanbu	7.5	Ansei Hachinohe-oki Earthquake,Tsunamis struck Sanriku and the southern coast of Hokkaido. 93 outflows, 106 houses collapsed, 26 drowned in Nanbu Domain. 3 dead in Hachinohe Domain.
1858	Hachinohe, Sannohe	7.3	Depots, floodgates, and bridges were damaged in Hachinohe and Sannohe.
1901	E Off Aomori	7.2	18 dead or injured, 8 timber houses collapsed in Aomori. Some damages in Akita and Iwate. A 60 cm high tsunami was observed in Miyako, Iwate.
1945	E Off Aomori	7.1	2 house collapsed, 2 dead in Aomori. The total amplitude of the tsunami was 35 cm.
1968	E Off Aomori	7.9	Tokachi-oki Earthquake,52 dead, 330 injured, 673 houses collapsed, 3,004 partially destroyed. Observed tsunami heights were 3-5 m on the Sanriku Coast and 3 m on Cape Erimo.
2008	Northern Coast, Iwate	6.8	The intraslab earthquake with the normal fault of the Pacific plate (depth of 108 km). 1 dead, 211 injured, 1 house collapsed, 0 partially destroyed (as of January 2009). Maximum Is was 6-.
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.