Abstract
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Times;">We investigate a fast and easy way to parallelise seismological serial codes mainly oriented for simulating the</p> <p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Times;">seismic wave propagation through anelastic dissipative media. Having an efficient modelling tool is important</p> <p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Times;">in both assessing strong ground motion and mitigation of seismic hazard when the site effects are considered,</p> <p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Times;">and in crustal propagation when the crustal geological structures are of interest. Our chosen case study is representative of a set of such seismological 3D problems. The Scalable Modelling System (SMS) tool for parallelization is considered. The IBM SP5 native compiler has been used. Results such as Speed-Up and Efficiency are shown and discussed. SMS can run both in shared and distributed memory environments. The greater advantages of using SMS in such environments become apparent with the utilisation of a higher number of multiprocessor machines arranged in a cluster. We also demonstrate how successful porting from serial to parallel codes is realised by way of minimal instructions (6% of the serial original code only) provided that an ad hoc profiling analysis of the serial code is first performed.</p> <br />
Highlights
An important contribution to assessing interaction between near-surface geology and seismic radiation arises from studies involving the so called site effects P.-Y. Bard, 1995; 1998; Panza et al, 2001; S
We investigated a simple and efficient way to parallelise a serial code, namely 3D seismological code able to simulate the interaction between seismic radiation and near-surface geological structures
The chosen case study code (Oprsal and Zahradnik, 2002) and the case test geological site (Fäh et al, 2006) are representative of a wide set of seismological problems dealing with the aforementioned dynamic interaction
Summary
An important contribution to assessing interaction between near-surface geology and seismic radiation arises from studies involving the so called site effects P.-Y. Bard, 1995; 1998; Panza et al, 2001; S. It would be useful to reconvert such serial codes into parallel ones, to have more powerful simulations that realistically represent the dynamics of such interaction. For the purposes of our study, we adopted the serial code of Oprsal and Zahradnik (2002), which contains general aspects that make it representative of the dynamics that we want to simulate. Its stability conditions are represented by the classical C.F.L. criterion for explicit methods (Mitchel and Griffits, 1980) These features are adopted in many of the serial codes developed in the last years dealing with the seismic wave propagation problem, used to assess strong ground motion (Zahradnik et al, 1993; Graves, 1998; Oprsal and Zahradnik, 1999; Pitarka, 1999; Moczo et al, 2001; amongst others)
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