There seems to be a great deal of activity on the webicorders, but there are not any events listed on the “Recent Events” list. What is going on?
Only earthquakes with magnitudes greater than 1.5 are on the list of recent events. It is possible that several earthquakes have taken place that were all of magnitude less than 1.5. Also, it takes the seismology lab time to analyze each earthquake and properly determine its magnitude. Some smaller events in the magnitude 2 range may not be posted on the list until three days after they occur. There is also the large possibility that the activity on webicorders is not seismic. Weather conditions such as wind and heavy rain will cause plenty of spikes and glitches. The instrument that is producing unusual signals may be broken. Outages in our network can last hours, days, or months, depending on the cause of the failiure and our ability to access the instrument. Some instruments are at high elevations or remote locations, and fixing them takes longer than other, easier to access instruments. The PNSN has more than 150 stations. Temporary problems with a few stations at any given time wi
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