Deep groundwater discharge after the 2011 Mw 6.6 Iwaki earthquake, Japan

Earth, Planets and Space

Masaaki Takahashi¹  Norio Matsumoto¹  Tsutomu Sato¹  Kohei Kazahaya¹ 

[1] Geological Survey of Japan, AIST;

关键词: Coseismic hydrological change;    Hot spring water discharge;    2011 Iwaki earthquake;    2011 Tohoku-oki earthquake;    Crustal strain;    Water temperature;   

DOI  :  10.1186/s40623-020-01181-7

来源: DOAJ

【 摘 要 】

Abstract Hot spring discharge was linked to the 2011 Mw 6.6 Iwaki earthquake. Periodic surveys revealed that the discharge continued for more than 7 years, which is a rare and valuable long-term record of hot spring discharge triggered by an earthquake in a non-volcanic area. In terms of coseismic changes, based on a comparison of the spatial distribution of changes in the coseismic water head and calculated crustal volumetric strain using a fault model, hot spring water discharge was found to be caused by a change in the coseismic crustal volumetric strain. As for the postseismic changes, observations over 7 years revealed a gradual rise in the temperature and chloride ion concentration of the hot spring water. Such long-term hot spring discharge may be explained by the following two causes: the rise of thermal water from the deep part and the permeability changes along the hot spring channels.

【 授权许可】

Unknown