Besides the main text page giving the rational and analyzed results of this experiment we provide two versions of the actual seismic waveforms acquired from three instruments in the stadium (HWK1, HWK2 and HWK3) as well as an instrument in a nearby building (KDK). These waveform traces may or may not be available or of use to users at any time for a variety of technical reasons. Depending on interest and number of users requesting data it is possible or even likely the main PNSN web server capacity will be exceeded and no response will be received by a user.
(real-time three station feed) : This was a very experimental presentation using new technology called WebSockets and HTML5. It failed during the Jan 11 game and was discontinued.
We are grateful to Ruben Luis, who wrote the code for the module we are using, called WebSWave. It is a contributed module to the Earthworm
seismic data aquisition and processing system used by many seismic networks worldwide. Some web browsers do not support this technology or have only a crude implementation. Some web browsers will become slow or even non-responsive. This technology is known to have problems under some types of heavy load. It may become unresponsive under any number of conditions. Because it automatically continues to update realtime data at a rate of about every two seconds many users may leave it running making its responsiveness even worse. Because of this we will experiment with ways of automatically restarting it now and then when under heavy load. This will requiring an end user to reload the link to continue monitoring the waveforms.
(snapshot of single channel): Using the same technology as our PNSN Seismograms
we are making higher resolution static images of the interesting data channels and updating those every couple of minutes. Because these static images can be cached, providing them on request is less of a load on our web servers and thus should be more reliable than the REALTIME version. Nevertheless, even these more reliable images may not be available under some conditions. All three channels of each of the three stations may be chosen with the pull-down menus near the top.
For the Jan 19 game we are trying a new Fan-O-Meter2
which is slightly more delayed and jerks along in 10 second intervals. We will see if it does better.
Individual traces or stations: Different sorts of telemetry are being used for acquiring data in realtime from the remote stations. These telemetry links may be vulnerable to overload or disconnections.
: Sending comments, questions or complaints
is appreciated; however, because of a possible large quantity of inquiries and very limited PNSN staff a specific response to you is unlikely or, at best will be slow!