Reviewing the 2016 Kumamoto earthquake damage in Mashiki town area by using microtremor measurements

The 2016 Kumamoto Earthquake has caused vast building damages and human losses, although Japan is one of the world’s well-prepared countries against earthquake disaster. The accelerometers set in Mashiki town area of Kumamoto prefecture rolled to the full scale measuring the seismic intensity as 7 i...

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Bibliographic Details
Published in:International journal of safety and security engineering 2017-11, Vol.7 (4), p.577-584
Main Authors: Lohani, Tara Nidhi, Nagao, Takashi, Fukushima, Yasuhiro
Format: Article
Language:English
Subjects:
Accelerometers
Boreholes
Disaster management
Earthquake damage
Earthquakes
Geological faults
Phase velocity
S waves
Shaking
Soil investigations
Velocity distribution
Volcanic soils
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Summary:The 2016 Kumamoto Earthquake has caused vast building damages and human losses, although Japan is one of the world’s well-prepared countries against earthquake disaster. The accelerometers set in Mashiki town area of Kumamoto prefecture rolled to the full scale measuring the seismic intensity as 7 in JMA scale of 7. In addition to such large shaking, there are opinions about the existence of three parallel fault lines beneath the town and the area lying on very soft volcanic soils regarding the vast damage of this particular area. In order to investigate the soil behaviour of this area, microtremor array studies were conducted starting from April 2016 to September 2016. Phase velocity obtained by spatial autocorrelation method was cross-checked with the borehole data available and was also found to be correlating well. Besides, the shear wave velocity distribution in the field was also consistent with the extent of damage observed after the earthquake.
ISSN:2041-9031
2041-904X
DOI:10.2495/SAFE-V7-N4-577-584