Investigation of coupling between surface processes and induced flow in the lower continental crust as a cause of intraplate seismicity

✍ Scribed by Rob Westaway

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 853 KB
• Volume: 31
• Category: Article
• ISSN: 0360-1269
• DOI: 10.1002/esp.1366

✦ Synopsis

Abstract

Many studies have highlighted the role of coupling between surface processes and flow in the lower continental crust in deforming the crust and creating topographic relief over Quaternary timescales. On the basis of the rheological knowledge gained, it is suggested that intraplate seismicity can also be caused by coupling between surface processes and flow in the lower continental crust. This view is shown to be a natural consequence of the modern idea that isostatic equilibrium is maintained by flow in the weak lower crust in response to erosion and sedimentation. It is supported by a general correlation between the vigour of surface processes and rates of intraplate seismicity, and by instances of seasonal seismicity that correlates with seasonal climate. Human interference in the environment can affect surface loading: for instance, deforestation for agriculture or urban development can cause increased erosion rates; global warming is expected to cause increased storminess (and thus increased erosion rates) and/or global sea‐level rise. The possibility of increased rates of seismicity resulting from these processes should thus be considered in future hazard assessment. Copyright © 2006 John Wiley & Sons, Ltd.