- Title
- Postseismic gravity change after the 2006-2007 great earthquake doublet and constraints on the asthenosphere structure in the central Kuril Islands
- Creator
- Han, Shin-Chan; Sauber, Jeanne; Pollitz, Fred
- Relation
- Geophysical Research Letters Vol. 43, Issue 7, p. 3169-3177
- Publisher Link
- http://dx.doi.org/10.1002/2016GL068167
- Publisher
- Wiley-Blackwell
- Resource Type
- journal article
- Date
- 2016
- Description
- 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 epicentral area during 2007–2015, is interpreted as resulting from gradual seafloor uplift by ~6 cm produced by postseismic relaxation. The GRACE data are best fit with a model of 25–35 km for the elastic thickness and ~1018 Pa s for the Maxwell viscosity of the asthenosphere. The large measurable postseismic gravity change (greater than coseismic change) emphasizes the importance of viscoelastic relaxation in understanding tectonic deformation and fault-locking scenarios in the Kuril subduction zone.
- Subject
- earthquakes; postseismic gravity changes; asthenosphere structures; central Kuril Islands
- Identifier
- http://hdl.handle.net/1959.13/1323560
- Identifier
- uon:24838
- Identifier
- ISSN:0094-8276
- Rights
- ©2016. The Authors. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
- Language
- eng
- Full Text
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