Ancora sui tempi di tragitto delle Pn provenienti dalla Sicilia Tabelle numeriche per varie profondità ipocentrali
| Autor: | G. PANNOCCHIA, L. MARCELLI |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 1974 |
| Předmět: | |
| Zdroj: | Annals of Geophysics, Vol 27, Iss 1-2, Pp 221-234 (1974) |
| Druh dokumentu: | article |
| ISSN: | 1593-5213 2037-416X |
| DOI: | 10.4401/ag-4921 |
| Popis: | This paper follows the foregoing studies by the A.A. already carried out on the earthquakes occurred in Western Sicily. The hypocentral data investigation concerning a further large earthquake of the swarm, has confirmed an hypocentral depth close to the "Molio". Grouping conveniently the investigated earthquakes it was possible to calculate the longitudinal waves travel-times curves at the following depths: 30, 35, 40, 45, 50, 00 km (A < 20°). Some interesting results concerning the first impulses of P„ waves have been found (existence of two series of waves, P,n and IJ„2 having a slightly different velocity). Five curves for each examined h have been calculated; the P„ (the general) using all the onsets including the ones whose residuals resulted later to be about three seconds: the Pni and the P„2 representing a Pn subdivision obtained by reducing the residuals range: the P„ -^13° and the P„ (10°M 20°) for 2» < A < 13° and 10° < A < 20° respectively calculated. (The P„ 13° approaches to a straight line, in accordance with other estimations for curves investigated along shorter paths). The paper contains also all numerical tables related to 29 travel-times curves calculated every 20 km; as well as the curve corresponding to li = 17.5 km. The last curve has been obtained averaging the values of depth from 5 km to 30 km in order to fill the gap 0 i—i 30 km. |
| Databáze: | Directory of Open Access Journals |
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