Improved structural models of the Earth and the knowledge about seismic wave propagation allow seismologists to study earthquake mechanisms. The surrounding of Australia is an exciting environment for such studies, due to a great variety of physical mechanisms responsible for earthquakes. Of particular interest are seismic events with anomalous seismic radiation and puzzling focal mechanisms, such as volcanic earthquakes, mid-ocean ridge events or explosions.
Although the radiation of most tectonic earthquakes can be described with the so-called double-couple system of imaginary forces, a full seismic moment tensor representation is more complete form of the mathematical description of seismic sources, especially in non-tectonic environments.
Different computational methods are used to reveal statistically significant non-double-couple components and model complex finite sources.