Horizontal sliding of kilometre-scale hot spring area during the 2016 Kumamoto earthquake.

ABSTRACT: We report horizontal sliding of the kilometre-scale geologic block under the Aso hot springs (Uchinomaki area) caused by vibrations from the 2016 Kumamoto earthquake (Mw 7.0). Direct borehole observations demonstrate the sliding along the horizontal geological formation at ~50 m depth, which is where the shallowest hydrothermal reservoir developed. Owing to >1 m northwest movement of the geologic block, as shown by differential interferometric synthetic aperture radar (DInSAR), extensional open fissures were generated at the southeastern edge of the horizontal sliding block, and compressional deformation and spontaneous fluid emission from wells were observed at the northwestern edge of the block. The temporal and spatial variation of the hot spring supply during the earthquake can be expl

SUBMITTER: Tsuji T 

PROVIDER: S-EPMC5317158 | biostudies-literature | 2017 Feb

REPOSITORIES: biostudies-literature