Authors / CoAuthors
Smith, R.S. | McEwin, A.J.
Abstract
The first Australian earthquake accelerograms were obtained from an accelerograph situated in the Dalton-Gunning region of New South Wales. Preliminary results were obtained for earthquakes on 23 November 1976 (maximum resultant acceleration 0.66 m/s^2), 30 June 1977 (0.21 m/s^2), 4 July 1977 (0.95 m/s^2) and 3 February 1979 (1.3 m/s^2). Maximum ground velocities were calculated for these earthquakes, and isoseismal maps drawn for the earthquakes at Bowning on 30 June 1977 and 4 July 1977. These data were used to test the validity of the relation Y = ae^bM R^-C for assessing ground motion, and hence determining seismic risk. Because of the uncertainties in the derivation of analytical expressions for ground motions, the fit to observed values of acceleration, velocity and intensity is considered to be good. The relation recommended for use by the Seismic Sub-Committee of the Australian National Committee on Earthquake Engineering included a depth-adjusting factor Co, where (R^2 = D^2 + h^2 + Co^2). When Co was omitted a better fit to the observed accelerations was obtained, but a poorer fit to observed velocities. The isoseismal pattern for the 4 July 1977 earthquake supports the radiation pattern expected from the faulting suggested by the focal mechanism and distribution of aftershocks. The isoseismals for the 30 June 1977 earthquake show a different radiation pattern; this suggests a different focal mechanism.
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document
eCat Id
81024
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
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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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geoscientificInformation
Series Information
BMR Journal of Australian Geology and Geophysics 5:1:63-67
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Unknown
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Extents
[-36.0, -34.0, 148.0, 150.0]
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Spatial Resolution
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