| Abstract: | Earthquakes of local magnitudes between
and
have occurred in Greenland in the last few decades. Most of the earthquakes are located near the coasts. Some of the earthquake zones are connected to known tectonic features in and near Greenland.The magnitude determinations are based on Lg wave amplitudes and are calibrated using the mb determinations of the International Seismological Centre. The attenuation of the Lg waves differs from region to region. Along some paths crossing younger geologic features the attenuation is large compared to that in the paths of the old crystalline shield rocks. The Lg wave propagation is influenced by the Greenland ice cap. All the long paths go through the interior of Greenland with its 2–3 km ice cap thickness and they exhibit relatively large Lg wave attenuation. |
