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Actually it is incredibly accurate only if you use PPS output otherwise
idea of having atomic clock in your pocket goes out of the window.<br>
<br>
Richard Guest pravi:
<blockquote
 cite="mid:1e3adca60804191601q695fb15aq278f0580bb308282@mail.gmail.com"
 type="cite">
  <pre wrap="">GPS essentially *is* accurate timing... GPS satellites are flying atomic clocks.
Trimble has a good GPS tutorial - <a class="moz-txt-link-freetext" href="http://www.trimble.com/gps/index.shtml">http://www.trimble.com/gps/index.shtml</a>

Almost all Digital Seismometers have a GPS interface to get the
accurate timing they require.

On 20/04/2008, Brandon Kruger <a class="moz-txt-link-rfc2396E" href="mailto:bmk789@gmail.com">&lt;bmk789@gmail.com&gt;</a> wrote:
  </pre>
  <blockquote type="cite">
    <pre wrap="">On Sat April 19 2008 5:52:14 pm Ortwin Regel wrote:
    </pre>
    <blockquote type="cite">
      <pre wrap="">Yes, AFAIK GPS requires accurate time to function.

Ortwin

On 4/19/08, Brandon Kruger <a class="moz-txt-link-rfc2396E" href="mailto:bmk789@gmail.com">&lt;bmk789@gmail.com&gt;</a> wrote:
      </pre>
      <blockquote type="cite">
        <pre wrap="">On Sat April 19 2008 5:29:50 pm Richard Guest wrote:
        </pre>
        <blockquote type="cite">
          <pre wrap="">Yeah, it's an interesting idea.
I read something similar on Evil Mad Scientist
<a class="moz-txt-link-freetext" href="http://www.evilmadscientist.com/article.php/seismometry2">http://www.evilmadscientist.com/article.php/seismometry2</a>

The detection/pinpointing part requires both accurate detection of
shaking and timing - obviously the timing is critical for
triangulation.

I think the *cool* factor for something like this would be the ability
to measure a persons actual physical experience of an earthquake.
          </pre>
        </blockquote>
      </blockquote>
    </blockquote>
    <pre wrap="">There
    </pre>
    <blockquote type="cite">
      <blockquote type="cite">
        <blockquote type="cite">
          <pre wrap="">are *lots* of existing seismometers that will do the *fixed* point
detection a whole lot better, but none (that I know of) that will be
(relatively) unobtrusive to the users daily life and still give an
actual measurement
          </pre>
        </blockquote>
        <pre wrap="">of

        </pre>
        <blockquote type="cite">
          <pre wrap="">physical shaking intensity.

You shouldn't have to wait that long for e/q info... In New Zealand
          </pre>
        </blockquote>
      </blockquote>
    </blockquote>
    <pre wrap="">the
    </pre>
    <blockquote type="cite">
      <blockquote type="cite">
        <blockquote type="cite">
          <pre wrap="">news media mostly regurgitate what we post on
          </pre>
        </blockquote>
      </blockquote>
    </blockquote>
    <pre wrap=""><a class="moz-txt-link-freetext" href="http://www.geonet.org.nz/">http://www.geonet.org.nz/</a>
    </pre>
    <blockquote type="cite">
      <blockquote type="cite">
        <blockquote type="cite">
          <pre wrap="">There's near-realtime shaking info on the front page, and if there's
actually an earthquake people can submit a "Felt Report" to tell us
          </pre>
        </blockquote>
      </blockquote>
    </blockquote>
    <pre wrap="">how
    </pre>
    <blockquote type="cite">
      <blockquote type="cite">
        <blockquote type="cite">
          <pre wrap="">they experienced it.
It would be really cool to see how a personal accelerometer trace
correlates to the fuzzy-logic of the felt report!


End thoughts...

--
Rich

On 20/04/2008, Brandon Kruger <a class="moz-txt-link-rfc2396E" href="mailto:bmk789@gmail.com">&lt;bmk789@gmail.com&gt;</a> wrote:
          </pre>
          <blockquote type="cite">
            <pre wrap="">After recently having a 5.2 earthquake here in the Midwest, I
realized the potential in the Openmoko for detecting/pinpointing
earthquakes. What this
is mostly dependant on is the accuracy of the accelerometers in the
Freerunner.  From what I've read, Macbooks' accelerometers and
            </pre>
          </blockquote>
        </blockquote>
      </blockquote>
    </blockquote>
    <pre wrap="">detect
    </pre>
    <blockquote type="cite">
      <blockquote type="cite">
        <pre wrap="">and

        </pre>
        <blockquote type="cite">
          <blockquote type="cite">
            <pre wrap="">measure earthquakes fairly accurately. [1]  If the Freerunner's
accelerometers are precise enough and it could be attached to a
            </pre>
          </blockquote>
        </blockquote>
      </blockquote>
    </blockquote>
    <pre wrap="">fixed
    </pre>
    <blockquote type="cite">
      <blockquote type="cite">
        <blockquote type="cite">
          <blockquote type="cite">
            <pre wrap="">ground,
we could use GPS to retreive an accurate location and record and
upload accelerometer data to a database.  Many different devices
running this could
provide intensity levels at many different locations and (at least
            </pre>
          </blockquote>
        </blockquote>
        <pre wrap="">fairly

        </pre>
        <blockquote type="cite">
          <blockquote type="cite">
            <pre wrap="">accurately), pinpoint an epicenter.  This data could become useful
            </pre>
          </blockquote>
        </blockquote>
      </blockquote>
    </blockquote>
    <pre wrap="">to
    </pre>
    <blockquote type="cite">
      <blockquote type="cite">
        <blockquote type="cite">
          <blockquote type="cite">
            <pre wrap="">researchers and would provide information about an earthquake faster
            </pre>
          </blockquote>
        </blockquote>
        <pre wrap="">than

        </pre>
        <blockquote type="cite">
          <blockquote type="cite">
            <pre wrap="">almost any news network would provide.

Thoughts?

[1] <a class="moz-txt-link-freetext" href="http://www.suitable.com/tools/seismac.html">http://www.suitable.com/tools/seismac.html</a>


--
----
Brandon Kruger <a class="moz-txt-link-rfc2396E" href="mailto:bmk789@gmail.com">&lt;bmk789@gmail.com&gt;</a>
<a class="moz-txt-link-freetext" href="http://onedollarlinux.com">http://onedollarlinux.com</a>
BLOG - <a class="moz-txt-link-freetext" href="http://onedollarlinux.com/personal/">http://onedollarlinux.com/personal/</a>

Please avoid sending me Word or PowerPoint attachments.
See <a class="moz-txt-link-freetext" href="http://www.gnu.org/philosophy/no-word-attachments.html">http://www.gnu.org/philosophy/no-word-attachments.html</a>

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            </pre>
          </blockquote>
        </blockquote>
        <pre wrap="">Wouldn't GPS provide an accurate time?  I thought GPS sends its own
official time, like an atomic clock.  I could be wrong.  Anyone know
        </pre>
      </blockquote>
    </blockquote>
    <pre wrap="">more
    </pre>
    <blockquote type="cite">
      <blockquote type="cite">
        <pre wrap="">about this?

--
----
Brandon Kruger <a class="moz-txt-link-rfc2396E" href="mailto:bmk789@gmail.com">&lt;bmk789@gmail.com&gt;</a>
<a class="moz-txt-link-freetext" href="http://onedollarlinux.com">http://onedollarlinux.com</a>
BLOG - <a class="moz-txt-link-freetext" href="http://onedollarlinux.com/personal/">http://onedollarlinux.com/personal/</a>

Please avoid sending me Word or PowerPoint attachments.
See <a class="moz-txt-link-freetext" href="http://www.gnu.org/philosophy/no-word-attachments.html">http://www.gnu.org/philosophy/no-word-attachments.html</a>
        </pre>
      </blockquote>
      <pre wrap="">_______________________________________________
Openmoko community mailing list
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      </pre>
    </blockquote>
    <pre wrap="">When I used a bluetooth GPS with my laptop, I notices the gpsd output had a
different time than my system clock showed, so I assume GPS provides its own
clock.

--
----
Brandon Kruger <a class="moz-txt-link-rfc2396E" href="mailto:bmk789@gmail.com">&lt;bmk789@gmail.com&gt;</a>
<a class="moz-txt-link-freetext" href="http://onedollarlinux.com">http://onedollarlinux.com</a>
BLOG - <a class="moz-txt-link-freetext" href="http://onedollarlinux.com/personal/">http://onedollarlinux.com/personal/</a>

Please avoid sending me Word or PowerPoint attachments.
See <a class="moz-txt-link-freetext" href="http://www.gnu.org/philosophy/no-word-attachments.html">http://www.gnu.org/philosophy/no-word-attachments.html</a>

    </pre>
  </blockquote>
  <pre wrap=""><!---->
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  </pre>
</blockquote>
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