Preambolo al Catalogo Sismico Nazionale (CSN). I criteri di informazione del Catalogo Sismico Nazionale (CSN)

Abstract

<p>This note presents a study meant to set out a national catalogue<br />(C.S.N.) of seismic events the epicentres of which are to be found in<br />Italian territory (or nearby). The catalogue, that will start from the<br />year 1450 B.C., could be used for various purpose employing modern<br />technologies.<br />The complete C.S.N, is made of three main parts, each of which can<br />also have a separate life:<br />1) An Analytical Catalogue which comprises the greater part of<br />data and is the most complete;<br />2) A Macroseismic Atlas that shows the macroseismic aspect of<br />the most relevant events;<br />3) A Macroseismic Catalogue that translates in numeric terms the<br />Atlas.</p><p>To these is added a comprehensive Bibliography subdivided into 24<br />chapters each of which covers one of the 24 time periods into which the<br />catalogue has been subdivided.<br />The Analytical Catalogue besides giving the main parameters for each<br />earthquake (date, epicentre, hypocentral depth, MCS scale intensity, raagnitudo,<br />each with its own reliability index) gives indications also on the<br />following sideline data:<br />1) epicentral location (meaning by this the geographic region and<br />the eventual indication that the epicentre is to be found on a borderline<br />touching more geographic regions, or in the sea, or on the coast, or othermise<br />in the external band (see text);<br />2) with a reference to the Atlas, the event is shown as having been<br />dealt with also mocroseismic data and it will con be found, as such, in<br />the Atlas and in the Macroseismic Catalogue;<br />3) indications on the typology of the earthquake: i.e. whether it is an<br />« isolated » earthquake, or a « seismic period » (and if so with the indication<br />of the foreshock, main or aftershocks) or of a swarm;<br />4) the possibility of indicating up to 7 sets of information suitably<br />chose among 40 additional notes regarding instrumental, geophysical,<br />physical or sensorial information besides the possibility of notifying<br />that the event had undergone specific studies or whether it is even to be<br />considered either noth sure or else legendary;<br />5) the possibility of indicating up to four bibliographical items, is to<br />be considered as capital.<br />The Macroseismic Atlas gives the isoseists of the more supported by<br />documentary evidences earthquake, with the calculation of the relative<br />areas, of the rays of the equivalent circles and of the rays of prevalent<br />maximal and minimal propagation; these latter with the value of the<br />azimuth measured from the geographical North passing through the<br />macroseismic epicentre.<br />The Macroseismic Catalogue reports numerically the macroseismic data<br />of the event: analytical and macroseismic epicentre; analytical and macroseismic<br />hypocentral depth, numerical values, in km., of the the three<br />serie of indicated rays, up to isoseist of the 4th degree (MCS).<br />A fac-simile of working form is given.</p>