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Subject: Re: [emergency-msg] CAP Use Scenarios Draft
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.
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