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Fig. 4 Spatial-temporal pattern of lower-crustal effective viscosities.
Spatial-temporal pattern of lower-crustal effective viscosities. Estimated effective viscosities using a power-law Burgers rheology with a stress exponent of 3 and the best-fit rheological properties in volumes 1 and 2. (A to C) Spatial heterogeneous effective viscosities immediately, 1 year, and 10 years, respectively, after the 1999 Chi-Chi earthquake. The solid and dashed lines indicate the rupture area of the Chi-Chi earthquake and the shallow brittle-ductile transition beneath the CR. GPS sites are shown as white triangles. (D and E) Effective viscosities in volumes 1 and 2 as a function of time. Black and colored curves indicate estimates from inversions and predictions of the best-fit equivalent power-law Burgers model. (F and G) Relation between effective viscosity and strain in volumes 1 and 2, respectively. Black dots show time periods of a day, week, month, year, and decade after the earthquake. The purple dashed lines indicate the fraction of strain rate in Kelvin element. Chi-Hsien Tang et al. Sci Adv 2019;5:eaav3287 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).
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