Lava dome growth and mass wasting measured by a time series of ground-based radar and seismicity observations

range and intensity measurements of the change in summit lava (� 1.5 � 10 6 m 3 , 22%), (2) AVTIS range measurements to measure the talus growth (� 3.9 � 10 6 m 3 , 57%), and (3) rockfall seismicity to measure the pyroclastic flow deposit volumes (� 1.4 � 10 6 m 3 , 21%), which gives an overall dense rock equivalent extrusion rate of about 7 m 3 � s � 1 . These figures demonstrate how efficient nonexplosive lava dome growth can be in generating large volumes of primary clastic deposits, a process that, by reducing the proportion of erupted lava stored in the summit region, will reduce the likelihood of large hazardous pyroclastic flows.