Abstract
Any major shaking of the Earth can be recorded on a seismograph regardless of the nature of the source. Earthquakes and large explosions generate waves with similar frequency content. This fact has been used for decades to construct systems to monitor detonations of underground nuclear explosions. The quality of the monitoring system has increased significantly in recent years, and we demonstrate here that the data are useful in Danish earthquake research.
Highlights
Any major shaking of the Earth can be recorded on a seismograph regardless of the nature of the source
A technique utilising crustal phases recorded at large distances has been introduced at the Geological Survey of Denmark and Greenland to improve the determination of the hypocentre depths
Tions as far away as North America and Africa. Some of these stations are operated by the United Nations Comprehensive Nuclear-Test-Ban Treaty Organisation (CTBTO)
Summary
FINES HFS tions as far away as North America and Africa. Some of these stations are operated by the United Nations Comprehensive Nuclear-Test-Ban Treaty Organisation (CTBTO). Data from many of these stations are available for scientific purposes. We demonstrate here how data from Canada and Niger can significantly improve the depth estimates for two earthquakes, one in Skåne, Sweden in 2008 and the other in the Danish part of the North Sea in 2010 (Figs 1, 2)
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