Plotted at the same scale are the last seven northern Washington-southern
Vancouver Island ETS events. These density plots are done by contouring the
number of tremor locations at each grid point during the whole ETS.
The blue arrows indicate the directions of propagation of the tremor over the
whole ETS if it is clear.
Back to weekly tremor location comparisons.
WARNING: The density amplitude may be missleading because of double counting
due to the same tremor location being reported by two different subnets.