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The magnitude scale: Throw it out!

The magnitude scale: Throw it out!

The Public: WOW! Did you feel that? The Seismologist: Yes. The Public: Cool. How hard did it shake? The Seismologist: The earthquake had a magnitude of 5.6 The Public [blank stare]: huh? The problem: A magnitude 6 event releases >30 times more energy than a M5 event […]

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How to buy a Seismometer, Part 2: When the best just won’t do!

How to buy a Seismometer, Part 2: When the best just won't do!

I was in the bicycle business in my past life and there was a brand call Wald, a real cheap brand. We were all Campagnolo snobs at the time. At one international bike show the entire Wald group showed up with t-shirts that read “when the best […]

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Broadband seismometers & local monitoring

Broadband seismometers & local monitoring

Every seismic observatory should have a few broad bands, they are truly things of wonder. Works of art. The Cadillacs of the seismic world. But having too many broad bands is counterproductive to real-time monitoring. Like driving a Hummer in an urban setting, painting your nails before […]

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Data QC on the Moon – Part 2

Data QC on the Moon - Part 2

So, for my last post on Data QC issues using the terribly fascinating Apollo Lunar data-set from the 1970’s, we look at a few Diurnal Spectrograms for their unique insight.  For the analysed data, PSD analysis is configured to produce PSD’s of time domain data one hour in […]

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Earthquake Eye Candy

Earthquake Eye Candy

Hi all: Buenas noches. I am on the road visiting friends at MARN in El Salvador to help them tune up their automated seismic processing system in exchange for training in CAPRA, a new seismic risk assessment software. Pretty spectacular stuff. So I need to keep today’s […]

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How to buy a Seismometer, Part 1

How to buy a Seismometer, Part 1

I see it every day.  Observatories need to expand their network and get some money to buy instruments.  They all want broadbands and they all want the iconic Streckeisen STS-2.  The broadband that started it all.  This instrument will solve all of their problems. No matter that […]

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Lunar Phase Noise Levels

Lunar Phase Noise Levels

In last week’s post we used the seismic data obtained from Apollo Mission 12 to look at Data QC and how PSD PDF plots can be informative in this regard.  We described the situation where an instance of the meta-data was inaccurate – missing information in the response file […]

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