000010155 001__ 10155
000010155 005__ 20141205154148.0
000010155 04107 $$aeng
000010155 046__ $$k2008-10-12
000010155 100__ $$aHalldorsson, Benedikt
000010155 24500 $$aOptimizing Recording Efficiency of a New Strong-Motion Array (ICEARRAY) Using Common-Triggering

000010155 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000010155 260__ $$b
000010155 506__ $$arestricted
000010155 520__ $$2eng$$aTraditional arrays using a central recording facility and dedicated communications channels to continuously record data are expensive to deploy and maintain. A lower cost alternative is to install a network of low-cost stand-alone instruments, each operating in a ‘triggered recording’ mode with local storage and near-real-time generic communications. Natural and cultural conditions generally result in varying background noise levels across the sites of a given network. Therefore, event detection and recording should be optimized to produce complete data sets, even for frequent small and local earthquakes, without creating masses of spurious records at individual nodes. We achieve this by employing a tuned “common-triggering” (CT) scheme, effectively converting a network of isolated instruments into an array. Selected instruments are configured to send trigger notification messages over the Internet to one or more central hubs, each running a CT detection algorithm. Within the CT detection algorithm, each received trigger notification message results in a preset number of 'votes' being added to a tally. The number of votes being added depends on the known triggering quality of the node sending the alert package. Whenever a preset number of votes are received within a moving time window, a global trigger command is issued to all instruments within the network. This system was implemented for the ICEARRAY, the first small-aperture, strong-motion array in Iceland, consisting of 14 CUSP-3Clp broadband, triaxial, strong-motion accelerographs equipped with GPS based timing and perpetual GPRS Internet communications. We show that the CT-scheme maximizes the array’s efficiency in recording real events while minimizing the analyst’s efforts in reviewing data. This system markedly improves the usefulness of a network of stand-alone instruments by converting them into an array with little or no additional cost and allows sites with marginal triggering suitability to be effectively incorporated as slave instruments.

000010155 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000010155 653__ $$aArray, ICEARRAY, Iceland, CUSP, optimization, triggering, earthquake, network, accelerograph, instrumentation 

000010155 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000010155 720__ $$aHalldorsson, Benedikt$$iAvery, Hamish
000010155 8560_ $$ffischerc@itam.cas.cz
000010155 8564_ $$s1137999$$uhttps://invenio.itam.cas.cz/record/10155/files/11-0105.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: 11-0105.
000010155 962__ $$r9324
000010155 980__ $$aPAPER