2016
DOI: 10.1002/2016gl068167
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Postseismic gravity change after the 2006–2007 great earthquake doublet and constraints on the asthenosphere structure in the central Kuril Islands

Abstract: Large earthquakes often trigger viscoelastic adjustment for years to decades depending on the rheological properties and the nature and spatial extent of coseismic stress. The 2006 Mw8.3 thrust and 2007 Mw8.1 normal fault earthquakes of the central Kuril Islands resulted in significant postseismic gravity change in Gravity Recovery and Climate Experiment (GRACE) but without a discernible coseismic gravity change. The gravity increase of ~4 μGal, observed consistently from various GRACE solutions around the epi… Show more

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Cited by 37 publications
(25 citation statements)
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References 29 publications
(63 reference statements)
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“…These other GRACE Field quantities include gravity gradients, vertical deflections, and gravitational gradient tensors (e.g., Li and Shen 2011;Sun and Zhou 2012;Wang et al 2012a;Li 2015;Die 2015), which are sensitive to small-scale signals. In this study we calculated a predicted total co-seismic gravity change of less than 1 which is consistent with Han et al (2016). Moreover, we calculate gravity change by the Release-05 (RL05) Level-2 monthly gravitational field data products and we show that the gravity signal is below the noise level.…”
Section: Intruductionsupporting
confidence: 80%
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“…These other GRACE Field quantities include gravity gradients, vertical deflections, and gravitational gradient tensors (e.g., Li and Shen 2011;Sun and Zhou 2012;Wang et al 2012a;Li 2015;Die 2015), which are sensitive to small-scale signals. In this study we calculated a predicted total co-seismic gravity change of less than 1 which is consistent with Han et al (2016). Moreover, we calculate gravity change by the Release-05 (RL05) Level-2 monthly gravitational field data products and we show that the gravity signal is below the noise level.…”
Section: Intruductionsupporting
confidence: 80%
“…For example the 11 March 2011 Mw 9.0 Tohoku earthquake post-seismic slips (Ozawa et al, 2011) occurred with a moment of about 10% of the main shock. However, Kuril events is distinctly different; namely, the magnitude of post-seismic gravity change becomes by far larger than the co-seismic change within a few years (Han et al, 2016). Han et al (2016) also shows that the predicted total co-seismic gravity change of less than 1 micro-Gal at GRACE's spatial resolution.…”
Section: Intruductionmentioning
confidence: 84%
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