Tectonic LFEs are characterized by generally low magnitudes (M<3) and have frequencies peaked between 1 and 3 Hz. They are the largest constituent of non-volcanic tremor at subduction zones, and in some cases are the only constituent.
Tectonic LFEs are defined as low-magnitude seismic events with frequencies concentrated between 1 and 3 Hz, dominating non-volcanic tremor at subduction zones.