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Iceland is divided into 34 basic alert regions. When number or size, etc., of small earthquakes
in these regions changes beyond predefined levels scientists are alerted to take a closer look
at the ongoing activity, to try to see if it might be premonitory for hazards.
Within PRENLAB-2
several algorithms have been developed to add to the alert functions and to base short-term warnings on.
The limited understanding of earthquake processes as well as of their variability, requests many methods,
based on our understanding of the physics of earthquake sources, or experience.
Following four methods are presently applied at IMOR.DG, for testing and as a basis
for warnings.
Hjorleifur Sveinbjornsson
2001-01-08