کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6427804 1634725 2015 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Viscoelastic relaxation in a heterogeneous Earth following the 2004 Sumatra-Andaman earthquake
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم زمین و سیاره ای (عمومی)
پیش نمایش صفحه اول مقاله
Viscoelastic relaxation in a heterogeneous Earth following the 2004 Sumatra-Andaman earthquake
چکیده انگلیسی


- We model viscoelastic relaxation following the 2004 Sumatra-Andaman earthquake.
- Heterogeneous models produce observed horizontal and vertical surface displacements.
- Model rheology structure is consistent with mantle temperatures from seismic imaging.

Consideration of the three-dimensional heterogeneity of mantle rheology allows models of viscoelastic relaxation following the 2004 Sumatra-Andaman earthquake to simultaneously fit both the observed far-field and near-field postseismic deformation. We use horizontal and vertical campaign and continuous GPS observations from the Andaman, Nicobar, and Sumatran forearc islands, mainland Sumatra, Thailand, the Malay Peninsula, the Indian Ocean, and southern India, spanning the first five years of postseismic deformation. The postseismic relaxation models consider contributions from the 2004 Mw 9.2 Sumatra-Andaman, the 2005 Mw 8.7 Nias, and 2007 Mw 8.4 Bengkulu earthquakes. Far-field motions to the east of the ruptures are equally well fit by homogeneous or laterally variable earth models. However, only models with contrasting rheology across the subducting slab, a ten-times higher mantle viscosity under the Indian Ocean lithosphere than the backarc mantle, can also produce the observed enduring postseismic uplift along the forearc and lack of far-field transient displacements in southern India. While postseismic uplift of forearc stations can also be produced by rapid and enduring down-dip afterslip, the inferred rheology structure is consistent with the distribution of mantle temperature inferred from seismic tomography.

198

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volume 431, 1 December 2015, Pages 308-317
نویسندگان
, , , ,