2024.1.7(6 days after the event)

Quick report of preliminary
reconnaissance of the 2024 Notohanto Earthquake in Japan
Masakatsu Miyajima (Professor Emeritus, Kanazawa University)
Masaho Yoshida (Professor, National Institute of Technology, Fukui College)
Yuko Serikawa (Assist. Professor, National Institute of Technology, Fukui College)

Outline of Reconnaissance WorkTeam member (ICGdR team):
Masakatsu Miyajima (Director-General of ICGdR)
Masaho Yoshida (Vice President of ICGdR)
Yuko Serikawa (Assistant of Director-General of ICGdR)(ICGdR: NPO International Consortium on Geo-disaster Reduction)

Survey Period: 2024.1.4-1.5Survey area: Wajima City and Anamizu Town

Outline of Earthquake
Wajima city

XSuzu city
• Time of Main Shock: 2024.1.1 16:10 (Local time)• Location of Epicenter: 137.2°E, 37.5°N
Anamizu town
• Depth of Hypocenter: very shallow
Shika-machi• Magnitude of Main Shock: MJMA 7.6
Nanao city
• JMA Seismic Intensity of Main Shock:
Noto peninsula
7: Shika-machi (Kanou)
6+:Wajima (Fugeshi), Suzu (Misaki), Nanao (notojimamukoda)
6-:Nanao (Honfuchumachi), Noto-machi(Ushutsu), Shika-machi (Togiryokenmachi)
5+:Hakui (Yanaida), Kanazawa (Sainen), Komatsu (Komade)After Shock Distribution(2024 1.1 10:00AM – 1.2 8:00AM)
M7.6
16:10, 1.1
M5.7
16:06, 1.1

M5.7
16:56, 1.1
M6.1
16:18, 1.1

Cross-section diagramby Japan Meteorological Agency
https://www.jma.go.jp/jma/press/2401/
01c/kaisetsu202401012130.pdf

K-NET Observatory Record
Site name

Site code

LatitudeLongitude

PGA (NS)PGA (EW)PGA (UD)PGV (NS)PGV (EW)PGV (UD)JMA SI*

Ootani

ISK001

37.5

137.1767

904

1429

67473

9175

6+(6.26)

Shouin

ISK00237.4473137.2877

686

707

775

104

117

50

6+(6.29)

Wajima

ISK00337.3924

136.9078

1496

1120

1110

96

65

59

6+(6.22)

Anamizu

ISK00537.2309136.9041

1023

1146

1044

95

145

42

7 (6.58)

Togi

ISK00637.1603136.6896

1479

2678

1142

65

66

43

7 (6.69)

Nanao

ISK00737.0426

136.968

374

359

283

3952

14

6- (5.82)

Hakui

ISK00836.8937

136.7784

374

483

354

41

52

24

5+ (5.44)

Nanatsuka

ISK00936.7334

136.7025

251219195

1719

95+ (5.18)

KanazawaISK010

36.5421136.6435

215

163

101

111365- (4.68)

Komatsu

ISK01136.3976

136.4409

138

161

50152145+ (5.04)* : Calcutaed by Prof. Nishikawa ( Professor of Fukui College of Technology)

by National Research Institute for Earth Science and Disaster Resilience
https://www.kyoshin.bosai.go.jp/kyoshin/quake/https://www.google.com/maps/d/u/0/edit?mid=1GdLXhVGKoGaWYdqRIayXEZTFnsirv_0&usp=sharing

Time Histories and Acceleration Response Spectra(K-NET Wajima)

Time history of acceleration

Acceleration response spectra

Time history of velocity

by National Research Institute for Earth Science and Disaster Resilience

https://www.data.jma.go.jp/eew/data/ltpgm/event.php?eventId=20240101161010

Time Histories and Acceleration Response Spectra(K-NET Anamizu)

Time history of acceleration

Acceleration response spectra

Time history of velocity

by National Research Institute for Earth Science and Disaster ResilienceTime Histories and Acceleration Response Spectra(K-NET Togi)

Time history of acceleration

Acceleration response spectra

Time history of velocity

by National Research Institute for Earth Science and Disaster ResilienceOutline of Personal Damage( As of 17:00, 6th of Jan. (5 days after the event))
Place

DeadMissingInjuredRefugee

Safety is unknown

145

7,122

3951

12,506140① Suzu city

38② Wajima city

69

③ Noto town

20354,170

10④ Anamizu town

90185

2,693

12⑤ Shika town

2075

1,096

0

⑥ Nanao city

50

32,466

4⑦ Nakanoto town

0012420⑧ Hakui city
⑨ Hodatsushimizu town

107138

0

000

590

1-①② ③④⑤ ⑥⑧⑦⑨

Damage Site Map of Anamizu Town

Floating of Manhole

Liquefaction

Damage Site Map of Wajima City

Damage to utility pole ⑨

Inclining of RC building ③Floating of Manhole ④
Overturn of RC building ①
Floating of manhole ⑦
Floating of manhole ⑤

Damage to utility pole ⑧
Liquefaction ⑩
Floating of manhole ⑥

Inclining of RC building ②

Damage to Wooden House

Japanese building code was upgraded in 1981. The many old wooden houses built before 1981
were collapsed. But some houses built after 1981 were also collapsed. Many persons died in astampede of the old houses. Collapsed houses are blocking roads, causing traffic problems.

Damage to Wooden House

Wajima city

Wajima city

Damage to Wooden House

Wajima cityWajima city

Damage to RC Building

Wajima city (Map ① )Damage to RC BuildingDamage to RC Building

Wajima city (Map ②)

Damage to RC Building

Wajima city (Map ③ )Damage by FireBurnt area

Downtown of
Wajima city

Copy of the Hokkoku Newspaper
Morning edition of 2024.1.3

Damage by Fire

A fire broke out immediately after the earthquake. The fire spread due to the fact that the road was blocked
by collapsed houses and it was not possible to go to the waterproof sink, and the number of fire engines
was small, and about 200 houses were burned down.

Floating of Manhole

Anamizu town (Map ① )Wajima city (Map ④ )In the center of the city, there were some manholes floating up, which was a traffic obstacle.

Floating of Manhole

Wajima city (Map ⑤ )Wajima city (Map ⑥ )Floating of Manhole

Wajima city (Map ⑦ )Wajima city (Map ⑦ )Damage to Utility Pole

Wajima city (Map ⑧ )Sloping utility poles block the road, causing traffic problems in the town.

Wajima city (Map ⑧ )Damage to Utility Pole

Wajima city (Map ⑨ )Landslide

Copy of the Hokuriku-chuunichi Newspaper
Morning edition of 2024.1.6.

Landslide

The affected area has many mountain areas and hilly areas, and many slope failures have occurred. It
swept away houses, blocked roads, and had a major impact on the affected areas. It seems that many
people were buried alive due to slope failure. Moreover, they have led to the creation of many isolated
villages and loss of communication

LandslideLiquefaction

Anamizu town (Map ② )Wajima city (Map ⑩ )Liquefaction occurred in the port area, but not on a large scale. It seems that the ground deformation due toliquefaction was not large.

Liquefaction

Wajima city (Map ⑤ )There were manhole floating in the city, thought to be due to liquefaction.

Wajima city (Map ⑦ )Concluding remarks• The massive earthquake that struck a depopulated and aging area is revealing avariety of issues.
• Many slope failures have disrupted the road network, created many isolatedvillages. Due to the disruption of the road network, relief efforts have been
delayed and relief supplies have also been delayed.
• Many casualties have occurred due to the collapse of the houses. Houses built
before 1981, when the Japanese Building Code was revised, have been severely
damaged. The relatively old houses built after that time were also damaged.
• Water and power outages are still on going in the affected areas, and relief efforts
are expected as soon as possible.

Information related to earthquake ground motion was provided byProf. Hayato Nishikawa of Fukui Institute of Technology. We
express sincere appreciation.
We would like to express our deepest sympathies to thoseaffected by the disaster and pray for the repose of the souls of
those who lost their lives. We pray for the earliest possible
recovery of the affected areas.