dorsal/arxiv
View SchemaPerformances of the Italian seismic network, 1985-2002: the hidden thing
| Authors | Alessandro Marchetti, Salvatore Barba, Luigi Cucci, Mario Pirro |
|---|---|
| Categories | |
| ArXiv ID | physics/0405032 |
| URL | https://arxiv.org/abs/physics/0405032 |
Abstract
Seismic data users and people managing a sesimic network are both interested in the potentiality of the data, with the difference that the former look at stability, the second at improvements. In this work we measure the performances of the Italian Telemetered Seismic Network in 1985-2002 by defining basic significant parameters and studying their evolution during the years. Then, we deal with the geological methods used to characterise or to plan a seismic station deployment in a few cases. Last, we define the gain of the network as the percentage of located earthquakes with respect to the total recorded earthquakes. By analysing the distribution of non-located ("missed") earthquakes, we suggest possible actions to take in order to increase the gain. Results show that completeness magnitude is 2.4 in the average over the analysed period, and it can be as low as 2.2 when we consider non-located earthquakes as well. Parameters such as the distance between an earthquake and the closest station, and the RMS location decrease with time, reflecting improvements in the location quality. Methods for geologic and seismological characterisation of a possible station site also proved to be effective. Finally, we represent the number of missed earthquakes at each station, showing that nine stations control more that 50% of all missed earthquakes, and suggesting areas in Italy where the network might be easily improved.
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"abstract": "Seismic data users and people managing a sesimic network are both interested\nin the potentiality of the data, with the difference that the former look at\nstability, the second at improvements. In this work we measure the performances\nof the Italian Telemetered Seismic Network in 1985-2002 by defining basic\nsignificant parameters and studying their evolution during the years. Then, we\ndeal with the geological methods used to characterise or to plan a seismic\nstation deployment in a few cases. Last, we define the gain of the network as\nthe percentage of located earthquakes with respect to the total recorded\nearthquakes. By analysing the distribution of non-located (\"missed\")\nearthquakes, we suggest possible actions to take in order to increase the gain.\nResults show that completeness magnitude is 2.4 in the average over the\nanalysed period, and it can be as low as 2.2 when we consider non-located\nearthquakes as well. Parameters such as the distance between an earthquake and\nthe closest station, and the RMS location decrease with time, reflecting\nimprovements in the location quality. Methods for geologic and seismological\ncharacterisation of a possible station site also proved to be effective.\nFinally, we represent the number of missed earthquakes at each station, showing\nthat nine stations control more that 50% of all missed earthquakes, and\nsuggesting areas in Italy where the network might be easily improved.",
"arxiv_id": "physics/0405032",
"authors": [
"Alessandro Marchetti",
"Salvatore Barba",
"Luigi Cucci",
"Mario Pirro"
],
"categories": [
"physics.geo-ph",
"physics.data-an"
],
"title": "Performances of the Italian seismic network, 1985-2002: the hidden thing",
"url": "https://arxiv.org/abs/physics/0405032"
},
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