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The M-w 9.0 Tohoku large earthquake induces far field (epicentral distance >1800 km) prominent coseismic water-level increase in the Fuxin well at northeastern China, which also influences volumetric strains. Different mechanisms of far-field coseismic water-level changes are analyzed by integrating these water-level/volume-strain data with broadband seismograms from a nearby station. Dilatation induced by propagating teleseismic wave (central frequency 0.02 Hz) may be the dominant mechanism of the observed water-level increases in the aquifer of Fuxin well. The dynamic energy density of similar to 5x10(-2) J/m(3) from the earthquake (computed from broadband seismograms), could be large enough to incur the far-field dilatation stress of similar to 0.35 MPa (with the strain variation of -3.7935x10(-6)) in the aquifer. The resulting enhancement in permeability by the dilatation stress can build a new pore-pressure equilibrium between the Fuxin well and the nearby Sihe reservoir (similar to 150 m away from the Fuxin well). The induced interstitial fluid flow in the region accounts for the sustained large-amplitude coseismic water-level increase. The Fuxin well lies in the geothermal area, and this study may also has some implications for the geothermal resource exploration.

acta geodynamica et geomaterialia

Permeability enhancement in the aquifer of Fuxin well in geothermal area of northeastern China induced by low-frequency teleseismic waves of the 2011 Mw 9.0 Tohoku earthquake