期刊
GEOPHYSICAL RESEARCH LETTERS
卷 44, 期 7, 页码 3119-3130出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2017GL072865
关键词
postseismic; Omori; rheology
资金
- UK Natural Environment Research Council (NERC) through the Leeds-York NERC Doctoral Training Program [NE/L002574/1]
- NERC through the Centre for the Observation and Modelling of Earthquakes, Volcanoes and Tectonics (COMET)
- NERC [NE/J019895/1, NE/J016322/1, come30001, NE/J01978X/1] Funding Source: UKRI
- Natural Environment Research Council [NE/J016322/1, NE/J019895/1, 1506352, come30001, NE/J01978X/1] Funding Source: researchfish
Various mechanisms have been proposed to explain the transient, enhanced surface deformation rates following earthquakes. Unfortunately, these different mechanisms can produce very similar surface deformation patterns leading to difficulty in distinguishing between them. Here we return to the observations themselves and compile near-field postseismic velocity measurements following moderate to large continental earthquakes. We find that these velocities have a remarkably consistent pattern, with velocity inversely proportional to time since the earthquake. This suggests that postseismic velocities show an Omori-like decay and that postseismic displacements increase logarithmically over time. These observations are inconsistent with simple, linear Maxwell or Burgers body viscoelastic relaxation mechanisms but are consistent with rate-and-state frictional afterslip models and power law shear zone models. The results imply that near-field postseismic surface deformation measurements are primarily the result of fault zone processes and, therefore, that the inference of lower crustal viscosities from near-field postseismic deformation requires care.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据