Seismic activity remained at a relatively low level throughout the period under review. Low amplitude broadband tremor which was ongoing at 16:00 on 1 March continued for several hours but then died out. Short periods of this tremor occurred during today, 2 March, associated with increased steam venting. One volcano-tectonic earthquake was located beneath the volcano at a depth of 0.9 km. Other seismicity, associated with rock fall events, was recorded on the Gages and Chances Peak seismometers throughout the day. A number of small long-period events were also recorded, but none were large enough to locate.
EDM measurements were made today on the eastern triangle and also from the Tar River EDM site to the Castle Peak reflector. A shortening of 3 cm was measured from Tar River to Castle Peak over the past month, consistent with the rate of movement measured on the eastern triangle over the same period.
Visual observations were made from the observation point in Farrell's and from the helicopter in the late afternoon. Daily changes in the shape and size of the dome are not noticeable to the naked eye, but observations of continued rock falls and steam and gas production indicate continued slow dome growth.