\u201cEarthquakes can occur in a series, during which a larger event can be preceded by smaller foreshocks or followed by aftershocks. Such cases have rarely been observed in Estonia,” explained Heidi Soosalu<\/strong>, a seismologist at the Estonian Geological Survey.<\/span><\/p>\n Tuesday\u2019s 1.4 magnitude earthquake was 22 times smaller than the one recorded on June 13, which registered 2.3 on the Eathquake Magnitude Scale. <\/span>\u201c<\/span>The depth of both events is estimated at approximately 4 km. This is a typical depth level for Estonian earthquakes,\u201d said <\/span>Soosalu .<\/span><\/p>\n \u201cAlthough negligible in global context, this seismic activity is worth noting on the Estonian scale. We are located on old stable geological basement and earthquakes here are typically few, small and sporadic. They occur when old faults become activated in the regional stress field caused by global plate movements. In the Nordic-Baltic area the main factor is pushing from the Mid-Atlantic ridge between Eurasian and North American plates,\u201c Soosalu added.<\/p>\n Earthquakes under a magnitude of 2.5 can rarely be felt by people. However some locals did report hearing t<\/span>hunder-like sound during the first earthquake in early June. \u201cSeismic waves are in fact acoustic waves propagating in the rock. They have low frequencies, typically <20 Hz. The higher end of seismic waves may be heard as thunder or banging,\u201d Soosalu concludes. <\/span><\/span><\/p>\n
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