Deep seismic reflection experiments at Kiruna View Full Text


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Article Info

DATE

1962-01

AUTHORS

Markus Båth, Eysteinn Tryggvason

ABSTRACT

In August 1955 a series of specially arranged quarry blasts in the Kiruna iron ore mines was recorded with a refraction apparatus at approx. 10 km distance. The experiments are the first seismic investigations of the deeper crustal structure in Fennoscandia and were mainly undertaken in order to study near-vertical reflections from crustal discontinuities. The records show clear directP waves with sharp onsets and a velocity of 5.65±0.13 km/sec (in porphyry), furthermoreS waves of less definite onsets and sound waves through the atmosphere.P waves reflected from crustal discontinuities are weak and of erratic occurrence, in agreement with theoretical expectation for near-vertical reflections. Approx. depths to the Conrad and the Mohoroviči'c discontinuities are calculated as 19 km and 33–34 km. There is general agreement with the explosion records written by the Grenet seismograph at Kiruna, and the differences which exist can be explained by the different frequency response of the two instruments. More... »

PAGES

79-90

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf01992650

DOI

http://dx.doi.org/10.1007/bf01992650

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1043995512


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