What are Halema`uma`u's smoke and other signals telling us?
![What are Halema`uma`u's smoke and other signals telling us?...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/vhp_img4703.gif?itok=P9tZTrW_)
Detailed Description
12-hour seismic record from HVO station NPT, near Halema`uma`u crater, from 7:30AM to 7:30PM HST on August 20. Visible on the record are microearthquakes, volcanic tremor, and tremor bursts. Highlighted at the middle of the figure is the very long-period (VLP) tremor, preceded by a possible rockfall or small earthquake at 3:40PM HST, associated with visible changes in the plume issuing from the Halema`uma`u vent.