Earthquake duration magnitudes in southeast Australia, accounting for site, seismograph and source
A new expression with superior consistency in the calculation of magnitude from earthquake coda duration has been developed. The need to take into consideration the site, the seismograph characteristics and the source has been investigated. The expression is valid for distances up to 1000 km in southeast Australia except where the source is located on some other major geological foundation, for example the Australian shield or the Tasman Sea. The expression takes the form: MD = p1 + p2(log(SDD))P3 + p4Re-p5R . MD is duration magnitude, and the parameters in the above expression are determined by regression based on local magnitude ML. Duration, D, is in seconds, R is the hypocentral distance in kilometres, and pn are parameters. Parameter p1 zeroes the function to give values similar to ML and accounts for the definition of duration; p2 and p3 give the shape of the variation with duration; and p4 and p5 give the variation with distance. SD is the duration site correction factor , which varies from site to site and can be easily determined by comparing particular site durations with average durations. If the network data are electronically recorded, the value of SD for all sites can be continually monitored and updated. Because of the different methods of estimating D for the analogue and digital seismographs, a value of the parameter p1 for each seismograph type is necessary. analogue MD = - 0.46 + 0.45(log(SDD))2.4 + 0.0045Re-0.002R . digital MD = - 0.20 + 0.45(log(SDD))2.4 + 0.0045Re-0.002R . The above expressions present the relationship between MD, D (measured to double the background level) and R in southeast Australia for magnitudes between MD 0 and 5 and for distances from a few km to 1000 km.
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- Date (Publication)
- 1995-01-01T00:00:00
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- Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/81411
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Role Organisation / Individual Name Details Publisher Australian Geological Survey Organisation
Canberra Author Wilkie, J.
1 Author Gibson, G.
2 Author Wesson, V.
3
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AGSO Journal of Australian Geology and Geophysics
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15:4:469-474
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Role Organisation / Individual Name Details Custodian Corp
Owner Commonwealth of Australia (Geoscience Australia)
Custodian Commonwealth of Australia (Geoscience Australia)
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GA Publication
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VIC
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- Australian and New Zealand Standard Research Classification (ANZSRC)
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Earth Sciences
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Published_External
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Creative Commons Attribution 4.0 International Licence
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4.0
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Journal article (pdf)
Journal article (pdf)
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pdf
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GA Publication
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Australian Government Security ClassificationSystem
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- 2018-11-01T00:00:00
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urn:uuid/fae9173a-7160-71e4-e044-00144fdd4fa6
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GeoNetwork UUID
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
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AGSO BMR Journal
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- Date info (Revision)
- 2018-04-20T06:07:31
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- 2014-06-03T00:00:00
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AU/NZS ISO 19115-1:2014
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ISO 19115-1:2014
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ISO 19115-3
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Geoscience Australia Community Metadata Profile of ISO 19115-1:2014
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Version 2.0, September 2018
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- https://pid.geoscience.gov.au/dataset/ga/122551