Greg Mendell, Joe Areeda, Robert Schofield, Josh Smith

The Department of Energy conducted seismic shear tests near LHO from April 6 to April 20th using a shaker truck. The last attachment is a google maps image from Robert showing the exact location of the shaker truck between 18:00 and 20:00 UTC on April 10. The first attachment is a spectrogram of H1:PEM-CS_SEIS_LVEA_VERTEX_Z_DQ over those same two hours. The injections were also visible in seismometers located at End-Y, Mid-X , and the vault, as shown in the other three attachments.

These spectrograms were made with ligodv-web https://ldvw.ligo.caltech.edu/viewer a web-based data viewer, using the default settings except 4 seconds per fft instead of 1 second.