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		Bando,Ibaraki	54,000	5
4		Kasukabe,Saitama	230,000	19
4		Minami,Saitama,Saitama	170,000	36
4		Joso,Ibaraki	61,000	11
4		Chikusei,Ibaraki	100,000	24
4		Chuo,Saitama,Saitama	96,000	34
4		Tsukubamirai,Ibaraki	50,000	19
4		Miyashiro,Minamisaitama,Saitama	35,000	18
3		Kawaguchi,Saitama	580,000	35
3		Asahi,Yokohama,Kanagawa	250,000	76
3		Kanagawa,Yokohama,Kanagawa	240,000	73
3		Urawa,Saitama,Saitama	150,000	34
3		Ishioka,Ibaraki	77,000	36
3		Kasama,Ibaraki	76,000	45
3		Noda,Chiba	150,000	15
3		Tsuchiura,Ibaraki	140,000	26
3		Kamagaya,Chiba	110,000	36
3		Shimotsuma,Ibaraki	43,000	11
3		Sakuragawa,Ibaraki	43,000	30
3		Sakura,Chiba	170,000	50
3		Toride,Ibaraki	110,000	24
3		Matsudo,Chiba	480,000	34
3		Kashiwa,Chiba	410,000	26
3		Minuma,Saitama,Saitama	160,000	28
3		Tochigi,Tochigi	160,000	35
3		Toda,Saitama	140,000	37
3		Midori,Saitama,Saitama	120,000	31
3		Omitama,Ibaraki	50,000	43
3		Tatebayashi,Gumma	77,000	36
3		Shirosato,Higashiibaraki,Ibaraki	20,000	60
3		Motegi,Haga,Tochigi	13,000	54
3		Tsukuba,Ibaraki	230,000	15
3		Omiya,Saitama,Saitama	120,000	32
3		Kuki,Saitama	150,000	21
3		Koga,Ibaraki	140,000	16
3		Kazo,Saitama	110,000	27
3		Moriya,Ibaraki	64,000	17
3		Shimotsuke,Tochigi	59,000	32
3		Shiroi,Chiba	60,000	36
3		Misato,Saitama	130,000	29
3		Ora,Ora,Gumma	28,000	43
3		Ichikawa,Chiba	480,000	41
3		Adachi,Tokyo	670,000	36
3		Itabashi,Tokyo	560,000	42
3		Kohoku,Yokohama,Kanagawa	350,000	68
3		Mito,Ibaraki	270,000	59
3		Kita,Saitama,Saitama	140,000	31
3		Yashio,Saitama	95,000	31
3		Moka,Tochigi	80,000	39
3		Satte,Saitama	53,000	16
3		Namegata,Ibaraki	35,000	53
3		Sakai,Sashima,Ibaraki	25,000	9
3		Edogawa,Tokyo	690,000	43
3		Yachiyo,Chiba	190,000	45
3		Urayasu,Chiba	170,000	49
3		Sakura,Saitama,Saitama	97,000	37
3		Higashimatsuyama,Saitama	91,000	45
3		Warabi,Saitama	73,000	36
3		Yoshikawa,Saitama	66,000	23
3		Chiyoda,Tokyo	60,000	46
3		Shiraoka,Saitama	50,000	22
3		Sugito,Kitakatsushika,Saitama	44,000	16
3		Kasumigaura,Ibaraki	42,000	30
3		Tokigawa,Hiki,Saitama	11,000	55
3		Sumida,Tokyo	260,000	43
3		Inashiki,Ibaraki	43,000	40
3		Funabashi,Chiba	620,000	45
3		Miyamae,Kawasaki,Kanagawa	230,000	63
3		Midori,Yokohama,Kanagawa	180,000	72
3		Nagareyama,Chiba	180,000	26
3		Narashino,Chiba	170,000	47
3		Narita,Chiba	130,000	51
3		Fujimi,Saitama	110,000	41
3		Gyoda,Saitama	81,000	40
3		Katori,Chiba	77,000	58
3		Hanyu,Saitama	55,000	32
3		Mibu,Shimotsuga,Tochigi	40,000	37
3		Ibaraki,Higashiibaraki,Ibaraki	33,000	51
3		Chiyoda,Ora,Gumma	11,000	43
3		Kanuma,Tochigi	98,000	54
3		Koto,Tokyo	490,000	47
3		Suginami,Tokyo	570,000	50
3		Chofu,Tokyo	230,000	59
3		Shibuya,Tokyo	220,000	51
3		Kumagaya,Saitama	200,000	46
3		Kodaira,Tokyo	190,000	56
3		Hanamigawa,Chiba,Chiba	170,000	50
3		Konosu,Saitama	120,000	34
3		Nishi,Saitama,Saitama	91,000	34
3		Wako,Saitama	83,000	44
3		Ryugasaki,Ibaraki	79,000	32
3		Matsubushi,Kitakatsushika,Saitama	30,000	20
3		Itakura,Ora,Gumma	15,000	29
3		Hitachiomiya,Ibaraki	42,000	67
3		Ota,Gumma	220,000	52
3		Nerima,Tokyo	720,000	46
3		Nakano,Tokyo	330,000	48
3		Nakahara,Kawasaki,Kanagawa	250,000	62
3		Soka,Saitama	250,000	31
3		Ageo,Saitama	230,000	30
3		Hodogaya,Yokohama,Kanagawa	210,000	76
3		Naka,Yokohama,Kanagawa	150,000	76
3		Chuo,Tokyo	140,000	48
3		Sano,Tochigi	120,000	36
3		Iwatsuki,Saitama,Saitama	110,000	24
3		Inzai,Chiba	94,000	36
3		Ushiku,Ibaraki	85,000	25
3		Shibukawa,Gumma	78,000	91
3		Okegawa,Saitama	74,000	32
3		Shiki,Saitama	70,000	41
3		Ami,Inashiki,Ibaraki	50,000	28
3		Nogi,Shimotsuga,Tochigi	27,000	21
3		Yachiyo,Yuki,Ibaraki	22,000	9
3		Miho,Inashiki,Ibaraki	15,000	37

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
1923	Western Kanagawa	7.9	Kanto Earthquake,The maximum amplitude of 14-20 cm was observed in Tokyo. Over 105,000 dead or missing, over 109,000 houses collapsed, 102,000 partially destroyed, over 212,000 destroyed by fire. Many landslides. Tsunamis struck the coast of Kanto. Wave heights were 12 m in Atami, Sizuoka; 9.3 m in Aihama, Chiba.
1924	Western Kanagawa	7.3	Tanzawa Earthquake,19 dead, over 1,200 houses collapsed.
1931	Northern Saitama	6.9	Nishi Saitama Earthquake,16 dead, 207 collapses (76 houses and 131 non-residential houses).
1949	Northern Tochigi	6.2	Imaichi Earthquake,10 dead, 290 houses collapsed, 2,994 partially destroyed, 618 non-residential houses collapsed. Many masonries were damaged. Many landslides were observed.
1983	Eastern Yamanashi	6.0	Rockfalls in Tanzawa. 1 dead, 8 injured. 33 injured in Yamanashi, Kanagawa, Tokyo, and Sizuoka. 2 houses collapsed.
1987	E Off Chiba	6.7	2 dead, 161 injured in Chiba. 16 houses collapsed and over 70,000 partially destroyed. Many roads damaged.
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-.
2012	E Off Chiba	6.1	The crustal earthquake with normal faults, induced by the 2011 off the Pacific Coast of Tohoku Earthquake. 1 dead, 1 injured. Maximum Is was 5+.