Seismic Source 2
Seismic Source 2 : The point of origin or an earthquake. Two main categories of seismic sources are transient and continuous. Transient sources have a total source duration of a few minutes or less; this duration cut-off corresponds to the duration of the largest earthquakes. Continuous sources may have a distinct spectral peak (such as microseisms) and hence appear as quasi-harmonic oscillations with durations of many hours or days. The main types of seismic sources that are routinely recorded are listed below: Transient: Earthquakes; Explosions (caused by humans); Volcanic explosions; Landslides; Extraterrestrial impacts and explosions. Continuous: Microseisms; Atmospheric noise; Volcanic harmonic tremor; Underwater volcanic venting
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