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The IRIS Audio file URL builder creates and launches a URL directed at the IRIS Time Series data service. This return a WAVE file (Sound File) for the time span selected. (Note for upgraders)
The opening screen of the URL Builder looks like this.
There are two main areas on the form concerned with setting up a sound
Let’s be honest setting the file up this way is hard work as I will explain in a moment, but you need to be aware of how it works.
You select a network, for example IU and then from the drop down list of stations pick a station, for example MAJO. You will then get a list in the channels/locations are of the available channels for each available location. You could select for example 00 | BHZ | (20) which is location 00, channel BHZ – the vertical channel and has a sample rate of 20 samples per second.
The Time and Date span
In the next area you choose the time and date of the start of the event, and of the end of the period you want to ‘hear’ or you can tick the duration check box and enter a number of seconds.
All of this is made much simpler if you launch the form from the lists of earthquakes. The image here is for the Standard version
The Pro versions are much the same
When doing it this way the nearest seismo is selected for you and the time is set to one minute before the event for a period of 15 minutes in total.
If the event happened less than 2 hours ago you may see this warning. It is still worth continuing. This just warns you that you may get nothing.
If you click on the ‘Advanced mode’ check box just below the Network, Station and Channel settings you can then tweak the various filter and scale settings, but I do not recommend that unless you understand how these settings affect the underlying data that will be used to create the sound file.
Generally to get a sound that is audible the full signal is required and reducing it by means of filters may leave you with a disappointing result.
You can save the file, save and play the file or just play the file. These options are set in the lower area of the form:
The three main options are self explanatory. The other two relate to how the sound file is handled after it has been saved. Regardless of whether you elect to save the sound file somewhere the file has been downloaded to the program file area. This has to happen or the file could not be played at all. Because the file is preserved you are also able to send it to Audacity if you have that on your system.
The exact location will be determined from your system and may vary from one system to another. Note: If you do a lot of plating without saving you may want to clear this area out from time to time.
If you set the output to ‘play’ to Audacity then obviously you will not hear any sound. If you have not used the option before you will see this:
If you already set up Audacity click Yes, otherwise install Audacity or click No. Clicking Yes will take you to your Program Files area to select the Audacity executable file.
Once Audacity is installed then the file will be launched into the Audacity program.
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This page was last updated 03 Dec 2013