In September and October 2019, the USGS and UC Berkeley (UCB) deployed two nodal seismographs at the Byerly Seismographic Vault (station BRK), east of the UCB campus. One of the nodes was located immediately outside the vault, and the other was located within the vault, adjacent to a broadband seismometer. The objective of this deployment was to compare recordings of local earthquakes and ambient noise as recorded by very stable broadband recorders in the vault with nodes that were placed within and outside of the vault. The node within the vault was placed in a barrel filled with sand, and the node outside of the vault was placed a few inches below the surface. Both nodes recorded for approximately 28 days.
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