Welcome to the SEISMONOISY 2.0 data consultation web page, where you can explore seismic noise data recorded by seismic stations across Italy.
Here it is possible to consult the value of the seismic noise expressed through the Seismic Noise Level Index (SNLI) and the historical data through the graphs provided. The SNLI value is calculated across 6 period intervals ranging from 0.1 to 120 seconds, aiding in understanding, and distinguishing various seismic noise contributions.
Additionally, an interpolation map of the SNLI value will help you comprehend and observe the distribution of noise levels across the Italian territory.
The SNLI is a dimensionless value that considers maximum and minimum levels of expected seismic noise on the Earth's surface, as defined by Peterson in 1993 (Low Noise Model 'NLNM' and New High Noise Model 'NHNM'). A value from 0 to 1 indicates that the site's noise falls within the NLNM and NHNM curves. Values greater than one indicate a noisy site, while values less than 0 indicate a low noise site. However, be cautious as an out-of-scale value may be related to sensor malfunctions or bandwidth limitations for the specific frequency range chosen.
The SNLI value is calculated over 12-hour seismic data windows. You can view data at 8:00 am and 8:00 pm. These times mark the end ofthe 12-hour seismic traces, so for example the SNLI values provided at 8:00 amon 26/02/2024 result from noise calculation on seismic traces ranging from 8:00pm on 25/02/2024 to 8:00 am on 26/02/2024, and so on.
Seismic noise data is calculated for all three mainc components: Z, N, and E.
Quick guide to data consultation:
- Select the time and day of interest or, to view the latest available data, click on 'last' button.
- Select the time period interval and the component of interest.
- After selecting the time, the interval period and the seismic component, all the data will automatically update if available.
- To view historical information, click on the station of interest on the main page or on the station code in the list on the left.
- For detailed information on individual stations, click on the displayed pop-up window.
- Here, you can view the PDF graph, the spectrogram graph of the 50% PDS curve of the PDF function and historical SNLI value graphs for different intervals (Note: To zoom in on graphs, click on the one of interest).
- The SNLI interpolation map is displayed in the bottom left window (Note: To view it in more detail, click on it).
- The bottom right window displays the statistical distribution graph of the SNLI value for all stations (Note: To view it in more detail, click on it).
Enjoy exploring!
Refer to:
Ruzza, G.; Cogliano, R.; D'Ambrosio, C.; Falco, L.; Cardinale, V.; Minichiello, F.; Memmolo, A.; Castagnozzi, A.; De Luca, G.; Vicari, A. SEISMONOISY: A Quasi-Real-Time Seismic Noise Network Monitoring System. Sensors 2024, 24, 3474. https://doi.org/10.3390/s24113474