新着・お知らせ

Title:
Preliminary Report of the Damage by the 2022 Off Fukushima Prefecture Earthquake Mj7.4, Japan

Authour:
Kazuma INOUE¹, Keita UEMURA², Keita SAITOH³, Kento ASAMI⁴, and Kotaro UCHIYAMA⁵

¹ Member of JSCE, Associate professor, Dept. of Civil Eng., National Institute of Technology, Gunma College
² Member of JSCE, Assistant Professor, Dept. of Civil and Earth Resources Eng. , Kyoto University
³ Member of JSCE, Student, Dept. of Urban Management, Kyoto University
⁴ Member of JSCE, Student, Dept. of Environmental Eng., National Institute of Technology, Gunma College
⁵ Member of JSCE, Student, Dept. of Environmental Eng., National Institute of Technology, Gunma College

Key Facts

• Hazard Type: Earthquake
• Date of the disaster: March 16th, 2022
• Location of the survey: Fukushima and Miyagi prefectures, Japan
• Date of the field survey: March 18th and 19th, 2022
• Survey tools: Digital Camera, GPS

Key findings: 
1) The superstructure collided against the western side abutment in the Date bridge.
2) The bearing pin was unfastened in the Showa Bridge.
3) The steps of intermediate piers can be confirmed in the Danzaki bridge.
4) The viaduct tilt due to Shear failure of columns was observed in Kunimi Town.

Key Words: Offshore the Fukushima Prefecture Earthquake, Geotechnical damage, Damage to bridges, Damage to Shinkanssen structure

Paper: PDF 3,303KB

Title:
Reconnaissance survey on geotechnical damage caused by February 6, 2023, Kahramanmaraş Earthquake, Türkiye

Authour:
Seda SENDIR TORISU¹, Tetsuo TOBITA², Takashi KIYOTA³, Ozer CINICIOGLU⁴, Gokce TONUK⁵, Nikolay MILEV⁶, Juan BRIONES⁷, and Othron BRIONES⁷

¹ Member of JSCE, Civil Engineer, Nuclear Facilities Division, Obayashi Corporation
² Member of JSCE, Professor, Department of Civil, Environmental and Systems Engineering, Kansai University
³ Member of JSCE, Professor, Institute of Industrial Science, University of Tokyo
⁴ Professor, Department of Civil Engineering, Bogazici University
⁵ Assistant Professor, Department of Civil Engineering, MEF University
⁶ Chief Assistant Professor, Faculty of Transportation Eng., Geotechnics, University of Architecture, Civil Engineering and Geodesy
⁷ Engineer, Geofizika EIG Ltd.

Key Facts

• Hazard Type: Earthquake
• Date of the disaster: February 6th, 2023
• Location of the survey: Islahiye, Tepehan, Iskenderun, Antakya, Golbasi, Kahramanmaras
• Date of the field survey: March 29th – April 2nd 2023
• Survey tools: Drone, Digital camera, GPS, Laser rangefinder, Microtremor

Key findings: landslides, liquefaction, inundation, settlement, embankment failure

Key Words: Kahramanmaras Earthquake, geotechnical damage, liquefaction, lateral spread, landslide, inundation, settlement

Paper: PDF 2,667KB

Title:
Road pavement cracks in Toge District, Monzen Town, Wajima City, in the January 1st, 2024, Noto Peninsula Earthquake, Japan

Authour:
Kazuo KONAGAI¹, Atsutoshi ONO², Takashi TAKANAKA³, Tomonori OKI⁴, and Kiyoharu HIROTA⁵

¹ Professor Emeritus, Inst., Industrial Science, University of Tokyo
² Research and Survey Department, Nakanihon Air Co., Ltd.
³ Tokyo Branch, Research and Survey Department, Nakanihon Air Co., Ltd.
⁴ Niigata Branch, Research and Survey Department, Nakanihon Air Co., Ltd.
⁵ Researcher, Secretariat, International Consortium on Landslides

Key Facts

• Hazard Type: Road pavement cracks
• Date of the disaster: January 1st, 2024
• Location of the survey: Monzen, Wajima City, Ishikawa Prefecture
• Date of the field survey: March 4th and 21st, 2024
• Survey tools: GPS

Key findings:

Strains produced in the ground are transmitted to road pavement, resulting in pavement cracks. The pattern of the quake-induced cracks observed in Toge District, Monzen Town of Wajima City, resembles that observed in the 2007 Noto Peninsula Earthquake.

Key Words: pavement crack, January 1st, 2024 Noto Peninsula Earthquake,

Paper: PDF 1,679KB

Title:
Geotechnical Preliminary Report of The Mj 7.3 Fukushima Earthquake on March 16, 2022

Authour:
Masataka SHIGA¹, Kwok-Kwan LAU², Pei-chen HSIEH³, and Takashi KIYOTA⁴

¹ Member of JSCE, Assistant Professor, Institute of Industrial Science, The University of Tokyo
² Ph.D. student, Dept. of Civil Eng., Graduate School of Eng., The University of Tokyo
³ Member of JSCE, Ph.D. student, Dept. of Civil Eng., Graduate School of Eng., The University of Tokyo
⁴ Member of JSCE, Associate Professor, Institute of Industrial Science, The University of Tokyo

Key Facts

• Hazard Type: Earthquake
• Date of the disaster: March 16th, 2022
• Location of the survey: Fukushima Prefecture and Miyagi Prefecture
• Date of the field survey: March 21st and 22nd, 2022
• Survey tools: Photos, videos, UAV, and LiDAR

Key findings:

1.  Cracking, ground settlement, and ground deformation were observed in the roads, bridge approaches, and embankments in Fukushima Prefecture and Miyagi Prefecture
2.  The landslides in Date Dam, Unoomisaki Tunnel portal area, and Tarumizu Dam could be associated with the strong ground motion of this earthquake event.
3.  Liquefaction was also identified in Soma Port of Fukushima Prefecture.

Key Words: The 2022 Earthquake off the coast of Fukushima Prefecture, Ground Damage, Slope Failure, Liquefaction

Paper: PDF 7,824KB

Title:
Widespread ground deformation over the Palu Basin caused by the 2018 Sulawesi, Indonesia Earthquake

Authour:
Kazuo KONAGAI¹, Ryoichi FURUTA², Takashi KIYOTA³

¹Fellow of JSCE, Professor Emeritus, University of Tokyo
² Member of JSCE, Group Leader, Social Infrastructure Group, Remote Sensing Technology Center of Japan
³Member of JSCE, Associate Professor, Institute of Industrial Science, University of Tokyo

Key Facts

• Hazard Type: Earthquake
• Date of disaster: Sept. 28th, 2018
• Location of Survey: Palu, Central Sulawesi, Indonesia
• Date of the field survey: Not Applicable
• Survey tools: Digital Terrain Models, InSAR

Key findings:

1. Pre and Post-earthquake Digital Terrain Models (DTMs) covering Palu Basin suggested that the entire stretch of the basin, mainly west of the irrigation canal, seemed to have deformed, not to mention the large flow slide sites.
2. Line-of-sight (LOS) deformations over the Palu Basin obtained from ALOS 2/PALSAR 2 at two different days after the earthquake (October 12, 2018, and January 4, 2019) showed that the flat land has slowly and steadily been deforming over the three months.

Key Words: 2018 Sulawesi Earthquake, long-lasting ground displacement buildup, lateral slides

Paper: PDF 1,900KB