InSight mission |
InSight mission |
Jan 7 2012, 08:29 PM
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#1
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
the GEMS Discovery finalist has been renamed InSight and now has its own website: http://insight.jpl.nasa.gov/
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Jan 8 2012, 06:59 PM
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#2
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Senior Member Group: Members Posts: 1018 Joined: 29-November 05 From: Seattle, WA, USA Member No.: 590 |
Here's a completely different question: to get earthquake locations, don't you need three, separated seismic stations? Without location, you don't really have magnitude, do you? What will InSight be able to tell us?
--Greg |
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Jan 9 2012, 08:50 PM
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#3
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Senior Member Group: Admin Posts: 4763 Joined: 15-March 05 From: Glendale, AZ Member No.: 197 |
Without location, you don't really have magnitude, do you? Actually you do. Because earthquakes generate three distinct types of waves that travel at different rates a lone seismometer can be used to calculate absolute distance to the focus (or center) of the event and magnitude as well. The only problem is direction. However if you have TWO sufficiently sensitive devices you can calculate the location by first identifying the two intersecting nodes, and then using secondary reflected events to isolate one of the two nodes as the event location. In fact the Viking landers had seismometers for this very purpose, however one of them malfunctioned (forget which right now). -------------------- If Occam had heard my theory, things would be very different now.
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