Articles | Volume 5, issue 1
Nat. Hazards Earth Syst. Sci., 5, 43–47, 2005

Special issue: Precursory phenomena, seismic hazard evaluation and seismo-tectonic...

Nat. Hazards Earth Syst. Sci., 5, 43–47, 2005

  03 Jan 2005

03 Jan 2005

Note on seismic hazard assessment using gradient of uplift velocities in the Turan block (Central Asia)

M. Jaboyedoff1,2, M.-H. Derron3, and G. M. Manby4 M. Jaboyedoff et al.
  • 1Quanterra, CH-1007 Lausanne, Switzerland
  • 2Institute of Geomatics and Risk Analysis (IGAR), University of Lausanne, CH-1015 Lausanne, Switzerland
  • 3Geological Survey of Norway/International Center for Geohazards, 7491 Trondheim, Norway
  • 4Deartment of Earth and Environmental Sciences, University of Greenwich, Chatham Maritime, United Kingdom

Abstract. Uplift gradients can provide the location of highly strained zones, which can be considered to be seismic. The Turan block (Central Asia) contains zones with high gradient of uplift velocities, above the threshold 0.04mm km-1year-1. Some of these zones are associated with important seismic activity and others are not correlated with any recent important recorded earthquakes, however, recent faults scarps as well as diverted rivers may indicate a recent tectonic activity. This threshold of gradient is probably a significant rheologic property of the upper crust. On the basis of these considerations the Uzboy river area is proposed as a potential high seismic hazard zone.