EPOS-N - European Plate Observing System
Seismometers / vault construction
Stations: Upgrade/install notes
Ideas for improvements
Installation / Inventory
Last update: February 17, 2020, at 01:26 PM
DATA QC - SOME IDEAS FOR IMPROVEMENT
These are just some notes for future consideration.
The normal Seedlink Monitor is part of the SeisComp package. We are using the Seedlink Server so it should not be too difficult to get the monitor program running.
The normal monitor web interface looks like this - clik to visit Geofon site:
Example of Geofon network Seedlink Monitor. Click image for large version.
New features can be added:
Quoting from http://www.iris.edu/software/pqlx/ :
PQLX (PASSCAL Quick Look eXtended) is open-source software authored by Richard Boaz (Boaz Consultancy) for evaluating seismic station performance and data quality. The software primarily consists of a server and client but also includes data extraction and migration tools. Given waveform data and instrument response files, PQLX server calculates trace statistics, Power Spectral Densities (PSD), and Probability Density Functions (PDF) and writes the results to a MySQL database for quick access.
Background information: PQLX, A Data Quality Control System: Uses and Applications, Orfeus Newsletter, June 2008
Plots can be based on weekly, monthly and yearly data.
The theory behind PQLX is not trivial, but interpretation of results are easier and would be of great benefit.
Example plot from USGS website:
Example of PQLX plot
These examples, and text, from PPT PQLX presentation (copy here).
As shown in IberArray PPT presentation at Seisan Workshop Oct 2008, University of Bergen, Norway (copy here):
Effect of improved sensor thermal insulation.
Related to the PQLX are plots of seasonal and daily variations in data (source: http://geohazards.cr.usgs.gov/staffweb/mcnamara/PDF_PLOTS):
In New Zealand, GeoNet is established as a collaboration between the Earthquake Commission and GNS Science to monitor four different types of geohazards: Earthquakes, landslides, tsunamis and volcanos. The latter uses some interesting displays to visualize data, called "RSAM" (Real-time Seismic-Amplitude Measurement) and "SSAM" (Seismic Spectral-Amplitude Measurement), explained here.
HTML5 with new Canvas element makes real-time charting of data easier: