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Since smaller earthquakes are usually imperceivable to humans I would not say that 4.0-5-9 magnitude earthquakes are imperceivable to humans. I have been within 100 miles of 2 earthquakes of this magnitude in my life and I felt both of them.
the number of seismometers has a direct correlation effect with the amount of recorded earthquakes. This fact is not based on assumption. If my town hires 10 more police officers, does this mean the crimes reported will definitely increase proportionately? Only if more people commit more crimes. What about if the town I live in posts a grocery store on every single corner? Will the total amount of groceries sold increase in proportion to the increase in stores? Only if more people buy more groceries. I would agree that there is an increase in earthquakes and an increase in the # of seismometers , but that does not in any way rule out the idea that there are more earthquakes within the 4.0-5.9 range happening.
In terms of global events, this is like saying it's been colder in the past week then the average temperature for the past 9 months. Both are interesting tidbits of information, but it would be reckless to draw any major conclusions from such insufficient data. I definitely agree, although I am not drawing any major conclusions, just merely pointing out that the total # of quakes over the last 20 year has trended up in relation to.....only the last 20 years. As you say, 20 years isn't much.
Like Physicsguy said, of real importance is the fact that we in the Northwest are overdue for a major quake and should allow this to be an eye opener for those that aren't prepared to take action and prepare to the best of their ability.