Mulmur

Mulmur is a term used in the field of seismology to describe a low-frequency, long-period seismic signal that is often associated with volcanic activity. It is characterized by its low amplitude and long duration, typically lasting from a few minutes to several hours. Mulmurs are believed to be generated by the resonance of volcanic conduits or magma chambers, and they can provide valuable information about the internal structure and dynamics of volcanoes.

Mulmurs are usually recorded on seismometers as continuous, low-frequency waves with periods ranging from 1 to 10 seconds. They are often accompanied by other volcanic seismic signals, such as volcanic tremors and volcanic earthquakes. The study of mulmurs has contributed to the understanding of volcanic processes, including magma ascent, degassing, and the formation of volcanic edifices.

Mulmurs have been observed at various volcanoes worldwide, including Mount St. Helens, Mount Etna, and Mount Vesuvius. They can occur both during eruptive and non-eruptive periods, making them a useful tool for volcano monitoring and hazard assessment. The analysis of mulmur signals can help scientists to better understand the behavior of volcanoes and to improve the accuracy of eruption forecasts.