Ambient noise analysis in "Sapienza" University of Rome
Data were acquired with one three component SARA VelBOX installed in the Department of Earth Sciecnes, Geotechnical Laboratory, UNIROMA1. The processing of ambient noise records include, merge, removing mean, down sampling, filtered, and sving data in units of velocity (μm/s) after removing the instrumental response, calucation of velocity envelope at a frequecny range (1-80 Hz).
- Save data in daily folder
- calc. envelope and plot on one plot
- or save day and night in separate folders
- separate plot for effects of regional EQs
Seismic signal related to subway activity. (a) Envelope of the vertical acceleration for the interval 19:00–24:00 UTC (21:00–02:00 Local time) from Thursday to Sunday, filtered in the 20–40 Hz (black line) and the 0.008 and 0.05 Hz (red line) bands and decimated to 1 sample every 10 seconds. Late service during Friday and Saturday nights are identified by a box. (b) Envelope of acceleration filtered between 0.008 and 0.05 Hz and decimated to 1 sample every 10 minutes. Friday and Saturday nights are identified with orange and red arrows and clearly differ from the rest of the week. Large peak on day 01/09 correspond to a 7.0 earthquake with epicenter in New Zealand. Other peaks are related to local noise sources.
Díaz, J., Ruiz, M., Sánchez-Pastor, P. S., & Romero, P. (2017). Urban seismology: On the origin of earth vibrations within a city. Scientific reports, 7(1), 15296.