Using Hi‐Net data in southwest Japan, Obara (2002) discovered a new type of seismic source that he called nonvolcanic tremor due to its similarity to volcanic tremor, but distinct origin. Tremor is characterized by weak signals, typically of deep (>30  km) origin, that are most prominent in the 1–10 Hz frequency band. At about the same time, slow‐slip events and tectonic tremor were found to be strongly correlated indicating that tremor accompanied these events (Obara, 2002; Rogers and Dragert, 2003). Tectonic tremor is challenging to locate because it is an extended and persistent signal, and lacks the...

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