Authors / CoAuthors
Denham, D.
Abstract
A new focal mechanism for the 1961 Robertson earthquake provides further evidence of contemporary thrust faulting in southeast Australia. When this is combined with the earlier work of Cleary and Doyle (1962) on the locations of the earthquake and its aftershocks, it seems that the earthquake was associated with a high angle (~80°) thrust fault, about 10 km wide and in the depth range 7 to 20 km, caused by northeast-southwest compression. This fault model is similar to that found by Mills and Fitch (1977) for the 1973 Picton earthquake, which also took place beneath the southern Sydney Basin. However, in situ stress measurements and earthquake data from immediately to the west in the Lachlan Fold Belt, suggest a different stress regime dominated by north-south compression. Thus, although the crust in southeast Australia is being compressed, the directions of maximum stress appear to change from region to region.
Product Type
document
eCat Id
81037
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
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2601
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Keywords
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- GA PublicationJournal
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- NSW
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_External
Publication Date
1980-01-01T00:00:00
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Topic Category
geoscientificInformation
Series Information
BMR Journal of Australian Geology and Geophysics 5:2:153-156
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Unknown
Parent Information
Extents
[-36.0, -32.5, 148.5, 151.5]
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Spatial Resolution
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