Freerunner and Earthquakes

[Peter Kraker]

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.

Richard Guest pravi:
> GPS essentially *is* accurate timing... GPS satellites are flying atomic clocks.
> Trimble has a good GPS tutorial - http://www.trimble.com/gps/index.shtml
>
> Almost all Digital Seismometers have a GPS interface to get the
> accurate timing they require.
>
> On 20/04/2008, Brandon Kruger <bmk789 at gmail.com> wrote:
>   
>> On Sat April 19 2008 5:52:14 pm Ortwin Regel wrote:
>>     
>>> Yes, AFAIK GPS requires accurate time to function.
>>>
>>> Ortwin
>>>
>>> On 4/19/08, Brandon Kruger <bmk789 at gmail.com> wrote:
>>>       
>>>> On Sat April 19 2008 5:29:50 pm Richard Guest wrote:
>>>>         
>>>>> Yeah, it's an interesting idea.
>>>>> I read something similar on Evil Mad Scientist
>>>>> http://www.evilmadscientist.com/article.php/seismometry2
>>>>>
>>>>> 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.
>>>>>           
>> There
>>     
>>>>> 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
>>>>>           
>>>> of
>>>>
>>>>         
>>>>> physical shaking intensity.
>>>>>
>>>>> You shouldn't have to wait that long for e/q info... In New Zealand
>>>>>           
>> the
>>     
>>>>> news media mostly regurgitate what we post on
>>>>>           
>> http://www.geonet.org.nz/
>>     
>>>>> 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
>>>>>           
>> how
>>     
>>>>> 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 <bmk789 at gmail.com> wrote:
>>>>>           
>>>>>> 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
>>>>>>             
>> detect
>>     
>>>> and
>>>>
>>>>         
>>>>>> measure earthquakes fairly accurately. [1]  If the Freerunner's
>>>>>> accelerometers are precise enough and it could be attached to a
>>>>>>             
>> fixed
>>     
>>>>>> 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
>>>>>>             
>>>> fairly
>>>>
>>>>         
>>>>>> accurately), pinpoint an epicenter.  This data could become useful
>>>>>>             
>> to
>>     
>>>>>> researchers and would provide information about an earthquake faster
>>>>>>             
>>>> than
>>>>
>>>>         
>>>>>> almost any news network would provide.
>>>>>>
>>>>>> Thoughts?
>>>>>>
>>>>>> [1] http://www.suitable.com/tools/seismac.html
>>>>>>
>>>>>>
>>>>>> --
>>>>>> ----
>>>>>> Brandon Kruger <bmk789 at gmail.com>
>>>>>> http://onedollarlinux.com
>>>>>> BLOG - http://onedollarlinux.com/personal/
>>>>>>
>>>>>> Please avoid sending me Word or PowerPoint attachments.
>>>>>> See http://www.gnu.org/philosophy/no-word-attachments.html
>>>>>>
>>>>>> _______________________________________________
>>>>>> Openmoko community mailing list
>>>>>> community at lists.openmoko.org
>>>>>> http://lists.openmoko.org/mailman/listinfo/community
>>>>>>             
>>>> 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
>>>>         
>> more
>>     
>>>> about this?
>>>>
>>>> --
>>>> ----
>>>> Brandon Kruger <bmk789 at gmail.com>
>>>> http://onedollarlinux.com
>>>> BLOG - http://onedollarlinux.com/personal/
>>>>
>>>> Please avoid sending me Word or PowerPoint attachments.
>>>> See http://www.gnu.org/philosophy/no-word-attachments.html
>>>>         
>>> _______________________________________________
>>> Openmoko community mailing list
>>> community at lists.openmoko.org
>>> http://lists.openmoko.org/mailman/listinfo/community
>>>       
>> 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 <bmk789 at gmail.com>
>> http://onedollarlinux.com
>> BLOG - http://onedollarlinux.com/personal/
>>
>> Please avoid sending me Word or PowerPoint attachments.
>> See http://www.gnu.org/philosophy/no-word-attachments.html
>>
>>     
>
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>   

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