Figure 2
From: Strength of tremor patches along deep transition zone of a megathrust
Spatio-temporal evolution of tremor sequences. (a) (upper panel) Map view of tremor activities during the May 2005 ETS episode (category A) with the onset of each tremor sequence shown by color. (middle panel) Tremor activities with radiated energy projected in the strike direction and the estimated migration speed (see Methods). (lower panel) Spatio-temporal evolution of short-term SSEs with a moment magnitude of 6.0 along the cross section enclosed by dashed lines in the upper panel, which is inferred by tiltmeters in ref.15. (b), Same as (a), but in the case of the April 2004 ETS episode in category B. A moment magnitude of short-term SSE during this episode was estimated to be 6.115. Maps are created using the GMT (Generic Mapping Tools, http://gmt.soest.hawaii.edu/) software package32.
