Non-Volcanic Tremor
Non-Volcanic Tremor : Non-volcanic tremor is characterized by long lasting wave-trains of low-frequency components between 1 and 10 Hz and lack of distinct P or S phases. Unlike the frequently observed deep lowfrequency micro-earthquakes beneath active volcanoes, nonvolcanic tremors are extremely large phenomena characterized by long time duration from hours to weeks and a wide source area, over 600 km in length (Obara et al., 2004). Non-volcanic tremor was first detected within subduction zones in southwest Japan and Cascadia and appears to be related to slow-slip events in these regions. Similar tremor is also observed in other fault settings such as the San Andreas fault system. Non-volcanic tremor is often associated with aseismic slip. See also low frequency earthquakes, slow slip-events, episodic tremor and slip
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