Graphs


The charts menu is different between the Standard/Lite and Pro versions. Standard/Lite has two items, and Pro has five items. The main reason for this is because the Standard and Lite versions of the program do not save a figure for energy to the database.

Charts Menu Std

Charts Menu Pro

The charts (graphs) are fairly basic comprising cumulative totals and magnitudes over a period. There are good facilities to export CSV files from the quake details elsewhere in the program which means you can do more complex graphs in Excel or equivalent. The cumulative totals graph is however very useful as in effect it displays the trend for a selection. More of that in a while.

The form for both versions is pretty much the same, except for an additional tab in the Pro version, and differences in the Data Sources available.

Main charts form
I will go through each of the entry areas now to explain how the data is selected.

Date SelectionBy default the form comes up with today as the ending date and 7 days before today as the starting date. You can of course change these to any dates for which you have data, or in the case of QVSData Lite from the current day to 30 days back for USGS and GeoScience or longer for EMSC and GeoNet.

You need to set the source for the data. Your database in the standard version will have four choices as shown below and the Pro version has at least 8 and possibly more. The Lite version also has 4 choices as the Standard, but they operate completely differently as there is no database in Lite.


(Image to be updated shortly)

You may set the magnitudes if you wish if you are looking to select a single band or magnitudes above a certain value. In Lite the magnitudes collected from the data provider selected are always the lowest possible from that provider however the plot program will still filter using the magnitudes after the data file has been collected.

You can also set the chart to global. This means that you don’t have to enter any text to search etc, but you also can only do this for magnitudes above 4.5 as otherwise your chart might crash!

If the number of points being charted is <= 99 you can turn on bar labels by ticking this box. This shows the value above each bar as shown in the example of a cumulative count below.

The ‘search’ tabs

Use this box to enter free text to be searched for in the database. Obviously it helps if you have an idea of the text that defines the area you wish to chart. You could for example enter Turkey, or refine it further to Eastern Turkey but you need to ensure that this phrase in in the locations text. Texts vary between USGS and EMSC so check it out first. In particular USGS has resorted to using locations such as ’54km NNW of Atka, Alaska’ where everyone else uses ‘Andreanof Islands. Aleutian Islands’ which is the Flinn-Engdahl region name. To be frank the new USGS naming is pretty much useless as a search name. The program as it is first set up uses the names as they are found, but there is a facility to change these for USGS data to the FE naming. There is a slight trade-off in time loading if this is other than ‘as is’.

On the next tab, which you could use to check out names, are the unique names that appear in the database for the selected provider. The same provisions above apply to this as the USGS name, if used ‘as is’ will be completely useless. This tab is not available in Lite as there is no database to extract locations from.

If you change the provider the names in this list will change.

The next tab allows to to select one of your ‘shapes’ – basically a box shape between defined latitude and longitude points.

You get some shapes I have defined when you install the program so there should be something in here.

On the next tab you can enter latitudes and longitudes to define an area not in your shapes, and you have the facility to add this new shapes to the list.

Click on the button on the right hand side to save the co-ordinates entered as a new shape.

Please note that when you use the previous box the program will enter the co-ordinates from your shape in THIS tab. If you create a chart using your shape you can then change to this tab and fine tune it if you wish.

Pro version only

The options tab allows you to adjust the scale of the energy values and switch between Joules and TNT equivalents. First the joules.

Tick the TNT box and the form changes to this:

An example of a global cumulative energy chart for 7 days, with no bar labels.

Checking ‘Show Day of Week’ gives the day below the date on the dates axis.

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