Madariaga, Raoul (2006) Earthquake dynamics and the prediction of strong ground motion. In: First European Conference on Earthquake Engineering and Seismology, 03.09.2006-08.09.2006, Geneva.
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Abstract
A large number of earthquakes have been modelled in detail using seismological, geological and geodetic information. Several common traits have been found for earthquakes kinematics at periods longer than 3s. At these frequencies, all large earthquakes (M>7) appear complex with highly variable slip, and propagate with rupture velocities close to about 80 % of the shear wave speed. Starting from these kinematic inversions, it is possible to use numerical wave propagation models in order to estimate the complete radiated field including near and far field effects. Radiation can be separated into two main components: a near field term responsible for the so- called fling steps due to permanent, geodetic offsets; and the far field that produces pulse like motions. Using seismological scaling relations it is possible to explain the main features of displacement spectra using classical seismological models at long periods. Seismic simulations may now be extended to the frequencies up to a few Hz by means of dynamic rupture propagation, where rupture is simulated starting from the kinematic models. In this talk I will review the main results obtained so far and the new avenues of research that have been opened thanks to new near field earthquake data and the ability to simulate increasingly complex and realistic seismic ruptures in a computer.
| Item Type: | Conference or Workshop Item (Paper) |
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| Subjects: | Methodology > Method and procesing |
| Project: | IS-EPOS project |