J-RISQ Report

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2023-05-11 04:16 (UTC+9),
SOUTHERN CHIBA,
40km Depth, M 5.4 by JMA

I_s Distribution Maximum Observed I_s:5+

Seismic Intensity (I_s) distribution is estimated from the observed data (circles) of NIED K-NET, KiK-net, JMA, and local governments that had been collected by 2023/05/11 04:27:03.

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]
5+		Kisarazu,Chiba	130,000	32
5-		Kimitsu,Chiba	90,000	30
4		Kanagawa,Yokohama,Kanagawa	230,000	60
4		Kamogawa,Chiba	36,000	13
4		Futtsu,Chiba	48,000	33
4		Isumi,Chiba	41,000	17
4		Ichihara,Chiba	280,000	33
4		Sodegaura,Chiba	61,000	33
4		Mihama,Chiba,Chiba	150,000	50
4		Chiyoda,Tokyo	49,000	68
4		Katsura,Chiba	20,000	12
4		Otaki,Isumi,Chiba	11,000	10
4		Chonan,Chosei,Chiba	9,300	21
4		Mutsuzawa,Chosei,Chiba	7,100	20
4		Asahi,Yokohama,Kanagawa	250,000	66
4		Totsuka,Yokohama,Kanagawa	280,000	64
4		Naka,Yokohama,Kanagawa	150,000	57
4		Shinagawa,Tokyo	370,000	62
4		Seya,Yokohama,Kanagawa	130,000	70
4		Nakahara,Kawasaki,Kanagawa	240,000	64
4		Sakae,Yokohama,Kanagawa	120,000	61
4		Minamiboso,Chiba	42,000	37
3		Urayasu,Chiba	170,000	57
3		Koto,Tokyo	460,000	62
3		Wakaba,Chiba,Chiba	150,000	48
3		Kohoku,Yokohama,Kanagawa	330,000	62
3		Tsurumi,Yokohama,Kanagawa	270,000	58
3		Kanazawa,Yokohama,Kanagawa	210,000	54
3		Hodogaya,Yokohama,Kanagawa	210,000	61
3		Minato,Tokyo	210,000	65
3		Ichinomiya,Chosei,Chiba	12,000	24
3		Kawasaki,Kawasaki,Kanagawa	220,000	58
3		Ota,Tokyo	690,000	59
3		Adachi,Tokyo	680,000	73
3		Fujisawa,Kanagawa	410,000	66
3		Shinjuku,Tokyo	320,000	70
3		Shibuya,Tokyo	200,000	68
3		Chuo,Tokyo	130,000	65
3		Nishi,Yokohama,Kanagawa	95,000	59
3		Ichikawa,Chiba	470,000	62
3		Kyonan,Awa,Chiba	8,800	34
3		Edogawa,Tokyo	680,000	63
3		Matsudo,Chiba	480,000	70
3		Bunkyo,Tokyo	200,000	69
3		Arakawa,Tokyo	200,000	70
3		Midori,Yokohama,Kanagawa	180,000	69
3		Onjuku,Isumi,Chiba	7,700	13
3		Atsugi,Kanagawa	220,000	80
3		Kasukabe,Saitama	240,000	95
3		Hanamigawa,Chiba,Chiba	180,000	52
3		Nagareyama,Chiba	170,000	77
3		Isogo,Yokohama,Kanagawa	160,000	57
3		Midori,Saitama,Saitama	110,000	88
3		Kamagaya,Chiba	110,000	66
3		Oamishirasato,Chiba	50,000	37
3		Tateyama,Chiba	49,000	37
3		Chosei,Chosei,Chiba	15,000	27
3		Sakura,Chiba	170,000	58
3		Funabashi,Chiba	610,000	58
3		Kashiwa,Chiba	400,000	77
3		Toshima-ku,Tokyo	280,000	73
3		Sumida,Tokyo	250,000	67
3		Konan,Yokohama,Kanagawa	220,000	59
3		Tsuzuki,Yokohama,Kanagawa	200,000	68
3		Chuo,Chiba,Chiba	200,000	45
3		Taito,Tokyo	180,000	68
3		Minami,Saitama,Saitama	170,000	87
3		Narashino,Chiba	160,000	55
3		Midori,Chiba,Chiba	120,000	40
3		Bando,Ibaraki	56,000	98
3		Shiroi,Chiba	59,000	67
3		Mobara,Chiba	93,000	26
3		Katsushika,Tokyo	450,000	68
3		Kita,Tokyo	340,000	74
3		Minami,Yokohama,Kanagawa	200,000	59
3		Yachiyo,Chiba	190,000	58
3		Izumi,Yokohama,Kanagawa	150,000	68
3		Misato,Saitama	130,000	76
3		Yachimata,Chiba	72,000	52
3		Togane,Chiba	62,000	42
3		Kujukuri,Sambu,Chiba	18,000	43
3		Miura,Kanagawa	48,000	53
3		Kawaguchi,Saitama	560,000	80
3		Suginami,Tokyo	550,000	75
3		Itabashi,Tokyo	540,000	75
3		Koshigaya,Saitama	330,000	85
3		Miyamae,Kawasaki,Kanagawa	220,000	71
3		Inage,Chiba,Chiba	160,000	49
3		Urawa,Saitama,Saitama	140,000	89
3		Zushi,Kanagawa	60,000	57
3		Sammu,Chiba	56,000	48
3		Inashiki,Ibaraki	47,000	84
3		Higashiizu,Kamo,Shizuoka	14,000	115
3		Nerima,Tokyo	710,000	77
3		Machida,Tokyo	430,000	78
3		Yokosuka,Kanagawa	410,000	48
3		Nakano,Tokyo	320,000	74
3		Soka,Saitama	240,000	78
3		Takatsu,Kawasaki,Kanagawa	220,000	69
3		Saiwai,Kawasaki,Kanagawa	150,000	60
3		Noda,Chiba	150,000	88
3		Chikusei,Ibaraki	110,000	124
3		Yotsukaido,Chiba	88,000	52
3		Ayase,Kanagawa	81,000	74
3		Shirako,Chosei,Chiba	12,000	32
3		Nagara,Chosei,Chiba	8,000	25
3		Otsuki,Yamanashi	28,000	122
3		Omiya,Saitama,Saitama	110,000	94
3		Setagaya,Tokyo	870,000	70
3		Aoba,Yokohama,Kanagawa	300,000	71
3		Yamato,Kanagawa	230,000	74
3		Fujimi,Saitama	110,000	93
3		Yashio,Saitama	91,000	76
3		Inzai,Chiba	89,000	70
3		Nakai,Ashigarakami,Kanagawa	11,000	90
3		Ito,Shizuoka	71,000	103
3		Sakuragawa,Ibaraki	46,000	125
3		Meguro,Tokyo	270,000	66
3		Chigasaki,Kanagawa	240,000	73
3		Chofu,Tokyo	230,000	77
3		Sayama,Saitama	160,000	101
3		Zama,Kanagawa	130,000	78
3		Kazo,Saitama	110,000	116
3		Iwatsuki,Saitama,Saitama	110,000	94
3		Toride,Ibaraki	110,000	80
3		Chuo,Saitama,Saitama	94,000	92
3		Shiki,Saitama	67,000	90
3		Joso,Ibaraki	65,000	93

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.

I_s Exposed-Population Estimates of Each City

5- or greater Close	5+ or greater Close
6- or greater Close	6+ or greater Not Available Close Not Available

Show All Data
Show All Data	5- or greater	5+ or greater	6- or greater	6+ or greater
Whole of Japan	50,000	20,000	< 1,000
Chiba Prefecture	50,000	20,000	< 1,000
Kisarazu,Chiba	50,000	10,000	< 1,000
Katsura,Chiba	< 1,000
Ichihara,Chiba	< 1,000
Kamogawa,Chiba	2,000
Kimitsu,Chiba	10,000	1,000
Sodegaura,Chiba	5,000	< 1,000

The summation of the exposed population for each city does not necessarily equal to that of the prefecture or whole of Japan.

Seismic Hazard Information of J-SHIS

J-SHIS is a Web service by NIED, to help prevent and prepare for earthquake disaster by providing a public portal for seismic hazard information across Japan.

I_s Distribution of 2% Probability of Exceedance in 50 Years I_s Distribution of Return Period of 50,000-year

I<sub>s</sub> Distribution of 2% Probability of Exceedance in 50 Years

Is Distribution of Return Period of 50,000-year

Major Historical Damaging Earthquakes in This Region

Year	Region	M	Damage
1921	Southern Ibaraki	7.0	Ryugasaki Earthquake,Minor damage in Chiba and Ibaraki such as damage to houses and roads.
1922	West coast, Chiba	6.8	Uragasuido Earthquake,1 dead in Tokyo, 1 dead in Yokohama, Kanagawa. Houses were damaged.
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.
1978	Near Izu-Oshima Island	7.0	Izu Oshima Kinkai Earthquake,25 dead, 211 injured, 96 houses collapsed, 616 partially destroyed, 1,141 roads damaged, 191 landslides.
1980	E Off Izu Peninsula	6.7	1 house collapsed, 17 partially damaged, 7 injured in Izu Peninsula.
1987	E Off Chiba	6.7	2 dead, 161 injured in Chiba. 16 houses collapsed and over 70,000 partially destroyed. Many roads damaged.
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+.

Reference: National Astronomical Observatory of Japan, Chronological Scientific Tables, Maruzen, (2017) *partially extracted

R-20230511041701-0055-00001

J-RISQ (http://www.j-risq.bosai.go.jp/)

Updated: 2023-05-11 04:28:03 (UTC+9) Ver.5 Final Report

Is Distribution Maximum Observed Is:5+

Estimated Is for Major Cities

Is Exposed-Population Estimates of Each City

Seismic Hazard Information of J-SHIS

Major Historical Damaging Earthquakes in This Region

Updated: 2023-05-11 04:28:03 (UTC+9) Ver.5
Final Report

I_s Distribution Maximum Observed I_s:5+

Estimated I_s for Major Cities

I_s Exposed-Population Estimates of Each City