The deployment used 3-C nodes with 5-Hz geophone to record continuous passive data at Mount St. Helens for about 35 days. The array consisted of 140 nodes total. 90 were distributed along a trail that forms a ring around the volcanic edifice near tree-line, with about 600 m spacing along the trail. Additionally three compact beamforming arrays were deployed: one outside the ring of nodes and two within the summit crater inside the ring of nodes. The deployment was carried out as a collaboration between University of New Mexico (B. Schmandt), USGS CVO (W. Thelen, S. Moran), and University of Oregon (A. Thomas).