Volcanic tremor wags on

摘要

Volcanic tremor is a type of seismic signal observed at active volcanoes. On page 522 of this issue, Jellinek and Bercovici1 present a model of tremor during eruptions that constitutes an advance in understanding this intriguing phenomenon. The chief characteristics of volcanic tremor are its long duration (minutes to days are common) and restricted frequency range, typically 1-5 Hz, with 2-3 Hz being especially common.