Source Parameters Estimated for Three Earthquakes in South-Iceland From Acceleration Records


Abstract eng:
In the year 2000 two earthquakes struck South-Iceland (17 June - M w 6.5; 21 June - M w 6.4). These were the largest earthquakes in South-Iceland since 1912 (M7) and were recorded on 25 strong motion stations. In 2008 a third earthquake, M w 6.3, struck with an epicentre only 30 km west of the fault 21 June 2000 event and was also recorded on several strong motion stations. In this article the source parameters using Brune‘s extended source model are computed for these earthquakes using the ground acceleration records. A frequency independent Q is assumed and kappa (κ) is estimated. The corner frequency and seismic momento are also estimated. These parameters that can be obtained from the strong-motion acceleration records along with a duration and a geometric attenuation function can provide a model that gives a good fit to measured the ground motion. The largest earthquakes in South Iceland have a right lateral strike-slip mechanism. They occur on parallel N-S trending faults with near vertical fault planes and their focus is shallow and extends all the way to the earths surface. Comparatively high acceleration values with regard to the size of the faults are observed in the source region and there is a rapid attenuation of in the near- and inter-mediate field This effect is demonstrated and a point source model with a geometric attenuation function is demonstrated to provide a good representation of strong-motion acceleration recorded in the earthquakes using the estimated parameters.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
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Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 4572.:
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