Gecko Compact Product User Manual
Also see for Blast: Product user manual
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Contents
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23The Histogram FolderThe top level folder named “histogram” contains daily CSV files where an entry is written tofile each minute, recording peak data values and other parameters. The files are simplynamed by date (e.g. 2016-12-31.csv). Open the file using Excel or a text viewer and youwill be able to plot the following data by minute:• The raw and sensor peak vector sum values for the ENZ channels in the last minute• The absolute peak values for the O channel in the last minute (4-ch models only)• Input Voltage and CPU Temperature at the time of the data entry• Latitude, Longitude, Altitude, and other GPS parameters at the time of data entry• The clock stability (vcxo) value, and the percentage of storage memory availableThe file header contains information about the station, including parameters for convertingraw values into sensor units.Divide the raw value by the cpv, sens and gain to calculate the value in units, e.g:290183 ÷ 838860.8 ÷ 750.0 ÷ 2 = 0.00023062 m/s (or 0.23062 mm/s)MiniSEED filesContinuous data files in the Gecko are in MiniSEED format, which is a widely adoptedinternational standard format for seismic data. You can find out more about this data formatat the IRIS website:http://ds.iris.edu/ds/nodes/dmc/data/formats/miniseed/Being a “data only” format, the lack of embedded station information makes it impossible tosimply open a file and read a ground motion value (and therefore calculate magnitude). Theway we have handled this is to embed a seismograph settings (.ss) file in every Hour folder.If you use our Waves application to open a data file, it will look for an .ss file in the file’sfolder and automatically read and apply the appropriate corrections to the data so thatground motion units are displayed. Similarly if you drag an entire Hour or Day folder intoWaves, it will read the first .ss file and apply these station settings to the merged data filedisplayed in the Waves window.The problem then becomes needing to keep the .ss files and MiniSEED data files together toretain this association. The simplest solution is to use the “Save As…” function in Waves tosave the file in “PC-SUDS” format (a less common international standard seismic dataformat) which embeds all of the relevant station data within the data file. Alternatively,select the option to save the file as a “MiniSEED zip” file which will bundle the .ms data filewith the .ss info file (and a station.xml file) into a zipped folder. |
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