Dust flux, Vostok ice core

Dust flux, Vostok ice core
Two dimensional phase space reconstruction of dust flux from the Vostok core over the period 186-4 ka using the time derivative method. Dust flux on the x-axis, rate of change is on the y-axis. From Gipp (2001).

Saturday, July 26, 2014

Seismic hazard map for Europe

This is a recently compiled standardized map of seismic hazard over Europe (Ukraine not yet included!). In older maps, the seismic hazards were defined differently in different countries, using different scales, making cross-border extrapolation uncertain. This model used harmonized data sets from all over Europe.

As you might expect, the deeper red colours represent the areas to be avoided (or at least the areas where you need to build to a high standard).

The map is a map of expected ground motion, which is dependent not only on the location and strength of probable earthquakes, but also local factors (ground condition being of critical importance). There is a lot more shaking experienced in soft sediment than on exposed bedrock.

The seismic hazard is an important consideration in building design.

Giardini, D., Wossner, J., and Danciu, L., 2014. Mapping Europe's seismic hazard. Eos, 95 (29): 261-262. 

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