Fig. 4: Conceptual overview of tremor signals.
From: Tremor signals reveal the structure and dynamics of the Oldoinyo Lengai magmatic plumbing system

Sketch of a transcrustal magmatic system with subtypes and mechanisms of volcanic tremor and cube of magmatic processes and their associated manifestations in the time, space and frequency. Observed seismic signals are: VLP Very Long Period, LP Long Period, DLP Deep Long Period, sometimes referred to as deep low frequency (DLP), VT EQs volcano-tectonic earthquakes. Stars and curly braces indicate tremor depths while the color of the star refers to the subtype of tremor signal. Mechanisms are explained in black boxes.