FactSheet: FS2016-E-0007

Title:
GEER Reconnaissance of the 2016 Kumamoto Earthquakes

Authour:
Robert KAYEN¹, Shideh DASHTI², KOKUSHO Takaji³, HAZARIKA Hemanta⁴, Kevin FRANKE⁵,Nicolas K. OETTLE⁶,Brad P. WHAM⁷, Jenny RAMIREZ CALDERON⁸

1Senior Scientist, United States Geological Survey, Menlo Park, CA, USA & Adjunct Professor, Department of Civil and Environmental Engineering, University of California, Los Angeles, Los Angeles, CA, USAy
2Assistant Professor, Department of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder, Boulder, CO, USA
3Professor, Civil Engineering Department, Chuo University, Tokyo, Japan
4Professor, Department of Civil & Structural Engineering, Kyushu University, Fukuoka, Japan
5Assistant Professor, Department of Civil and Environmental Engineering, Brigham Young University, Provo, UT, USA
6Senior Geotechnical Engineer, AECOM, San Jose, CA, USA
7Postdoctoral Associate, School of Civil and Environmental Engineering, Cornell University, Ithaca, NY, USA
8Ph.D. Student, Department of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder, Boulder, CO, USA

Key Facts:
・ Hazard Type: Earthquake
・ Date of the disaster: April 14th to 16th, 2016
・ Location of the survey: Kumamoto, Japan
・ Date of the field survey: May 11th through 13th, 2016
・ Survey tools: Terrestrial LiDAR, Unmanned Aerial Vehicle (UAV), Digital Photographs, Manual
Surveys

Key findings:
(1) major surface fault rupture occurred through a water reservoir,
(2) an unusual “depression zone” occurred in part of the Aso Caldera,
(3) a unique pre-and post-event aerial Li-DAR data set is available to study surface fault rupture through an embankment,
(4) a relatively small amount of liquefaction occurred, possibly a result of soil plasticity and sediment geology,
(5)a valuable non-displacement lateral spread was observed at a major bridge.

Key Words:
Kumamoto earthquakes, surface fault rupture, liquefaction, lateral spreading, LiDAR, UAV

Paper: PDF 6,655KB