Hypocentral distribution, focal mechanisms, and tectonic implications of Fennoscandian earthquakes, 1954–1978
作者:
Hilmar Bungum,
Jan Fyen,
期刊:
Geologiska Föreningen i Stockholm Förhandlingar
(Taylor Available online 1980)
卷期:
Volume 101,
issue 4
页码: 261-271
ISSN:0016-786X
年代: 1980
DOI:10.1080/11035898009450844
出版商: Taylor & Francis Group
关键词: Earthquakes;focus;focal mechanisms;catalogue;epicentre map;intraplate seismicity;stress;plate tectonics;glacial rebound;crustal model;continental margin;Oslo Graben;Oslo Rift Zone;Meløy;Denmark;Finland;Norway;Sweden;western U.S.S.R.;North Sea;Norwegi
数据来源: Taylor
摘要:
Analysis of seismicity data for Fennoscandia for 1954–1978 has resulted in a comprehensive catalogue of 604 earthquakes, most of which with locations based on instrumental recordings. Detailed analysis of four well-recorded earthquakes near the NORSAR array has given very accurate focal depth estimates of 6,22,23 and 31 km, as well as one normal and two oblique-slip fault plane solutions. These and some other local events have been used for the construction of a crustal model for southeastern Norway. A short description is given of the outstanding 1978 Meløy earthquake sequence in northern Norway, where about 10 000 microearthquakes were recorded over only 10 weeks. The seismicity in the Oslo Graben area is taken to indicate that this is a general zone of weakness, with local geological conditions strongly influencing the focal mechanisms. There is increasing evidence suggesting that global tectonic movements are a key factor for the accumulation of regional stress in Fennoscandia.
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