Re: [emergency-msg] CAP Use Scenarios Draft

[Eliot Christian <echristi@usgs.gov>]

At 07:59 PM 5/11/2003 -0700, Art Botterell wrote:
>[...]
>II - Automated Origination by Sensor System
>
>Along a popular Northwest beach a series of automatic tsunami sirens have 
>been installed.  In the base of each siren is an accelerometer and a 
>computer with a GPS receiver.  All of these devices are linked by a 
>wireless local area network.
>
>When an individual unit detects what appears to be a P-wave/S-wave 
>sequence that might indicate a near-shore earthquake, it generates a CAP 
>message containing its location, the precise time of the P-wave's arrival, 
>and the estimated distance of the epicenter based on the P-wave/S-wave 
>interval.
>
>Each computer in the network correlates all the messages received from the 
>other instruments (which form what amounts to a phased array) and, if the 
>pattern of messages suggests a near-shore quake (and not just a truck 
>driving down the coastal highway) then each siren activates.  In addition, 
>one of the instruments assembles a "summary" CAP message describing the 
>event and feeds it to regional and national seismic networks.
>
>(Based on an idea shared by David Oppenheimer at the USGS in Menlo Park.)

How about this, simplified, version:

A set of automatic tsunami sirens have been installed along a popular 
Northwest beach. The sirens are triggered by a wireless network of sensor 
devices. Each sensor generates a CAP message containing its location and 
the sensed data at that location that is needed for the tsunami 
determination. Each siren activates when a tsunami determination is made. 
In addition, a network component assembles a "summary" CAP message 
describing the event and feeds it to regional and national tsunami networks.