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**# Introduction**
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Elastic Lattice Method (ELM) is a discrete particle numerical method for simulating the seismic waves propagation through complex media in the presence of topography. The structural model consists of particles arranged on a cubic lattice which interact through a central force term and bond-bending force. Particle disturbances are followed through space by numerically solving their equation of motion. The description of the code, examples, and benchmarking against finite difference codes can be found in [1-6] . The ELM code has both 2D and 3D implementations, but the input files are nearly identical. Here we take the 2D version for instruction.
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**# Potential application in volcano observatories**
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The aim of volcano monitoring is to understand physical processes within a volcano and ultimately help in forecasting potential hazards. One of the primary interests in volcano-seismology is determining volcanic seismic sources, but the generation and propagation of seismic waves throughout volcanic regions is a complex and nonlinear phenomenon controlled by the interaction of many processes. Because volcanoes are highly mechanically heterogeneous they significantly distort seismic wave propagation and hence the source ‘fingerprint’ in seismograms is often hidden by ‘path effects’ created when the wave propagates from to the source to the seismic receiver. Using the VolcSeisSimu tool researchers or monitoring scientists can determine these propagation path effects for arbitrarily heterogeneous models and ‘deconvolve’ them from observed seismograms to better understand and constrain volcano source models. Source inversion is a highly specialised and time consuming research area, but is critical to a better understanding of volcano seismograms in terms of source processes. This scheme offers an alternative 3D method for modelling wave propagation in the presence of strong topography and subsurface heterogeneity, and the flexibility of the method allows for a wide range of possible source mechanisms with no restriction on source geometric shape or on the distribution and degree of elastic heterogeneity.
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**# Getting Started**
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To download the ELM, both of 2D and 3D, software packages, type this:
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