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STRONG GROUND MOTION SIMULATION FOR INTRA-PLATE ENVIRONMENT: A CASE STUDY FOR FINLAND

Authors:
  • PVA Engineering Services

Abstract

Globally, the majority of earthquakes happen inter-plate, although moderate to large earthquakes occur intra-plate, i.e. within the plates. The seismicity of Finnish part of Scandinavia is similar to the intra-plate environments. The seismic records of small intra-plate earthquakes will be investigated and characterised according to their frequency content, peak acceleration and the duration, and later compared with events from other parts of the world. In the absence of quality strong motion records of intra-plate earthquakes at short distances, synthetic seismograms are commonly used for testing of object behaviour. In this case study, the near field synthetic records of likely intra-plate earthquakes will be analysed, with a strong ground motion duration of several seconds simulated by using a Green's Function method. In it, a large earthquake is simulated by summation in time of a number of smaller earthquakes or sub-events, each given a slightly different origin time to represent the propagation of a rupture along a supposed fault plane. Thus, a record of a major earthquake for a given region can be synthetically created. The seismograms of small magnitude earthquake recorded on a few sites will be used as sub-events in this study, to simulate the main shock of magnitude 5-6. Additional validation studies for the events recorded elsewhere will be also considered. Further analysis of the response spectra in respect to the similar investigations will show the suitability of the synthetic waveforms produced by the Green's Function method for engineering purposes.
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