The 1933 Majella earthquake (Central Italy): a reappraisal of the intensity distribution
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Book Review| June 01, 1970 The western Sicily earthquake of 1963by J. E. Haas and R. S. Ayre, National Academy of Engineering, National Research Council, Washington, D. C., 1969, 70 p. George W. Housner George W. Housner Division of Engineering and Applied Science California Institute of Technology Search for other works by this author on: GSW Google Scholar Bulletin of the Seismological Society of America (1970) 60 (3): 1035. https://doi.org/10.1785/BSSA0600031035A Article history first online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Tools Icon Tools Get Permissions Search Site Citation George W. Housner; The western Sicily earthquake of 1963by J. E. Haas and R. S. Ayre, National Academy of Engineering, National Research Council, Washington, D. C., 1969, 70 p.. Bulletin of the Seismological Society of America 1970;; 60 (3): 1035. doi: https://doi.org/10.1785/BSSA0600031035A Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search nav search search input Search input auto suggest search filter All ContentBy SocietyBulletin of the Seismological Society of America Search Advanced Search This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not currently have access to this article.
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In this work we examine the seismicity of Montefeltro, a historical region of central Italy located between the northern Apennines and the Republic of San Marino towards the northern Adriatic coast. The seismicity of the northern Apennines region is mainly concentrated along the chain within a seismogenic layer that extends from about 5 to 15 km depth. Recently, important seismic sequences occurred in the central-northern Apenninic chain with magnitudes exceeding 5.5 (Colfiorito 1997, Mw 6.0; L’Aquila 2009 Mw 6.3; Emilia 2012, Mw 6.1; Amatrice 2016, Mw 6.5). Instead, the seismicity of Montefeltro, as recorded in the past three decades, appears quite widespread and discontinuous over time, except in some phases of intense activity. The magnitudes detected so far vary essentially from low to moderate, lower than 4.5 for the largest events. Unfortunately, the region that includes the Montefeltro is still not adequately monitored, therefore a detailed analysis of the background seismicity, the calculation of focal mechanisms for low magnitude events, and a more reliable estimate of the b-value is limited. To better define these parameters, a temporary seismic network has been set up starting from December 2018 to integrate the instrumental coverage provided by the Italian National Seismic Network (RSN). The analysis of the seismic activity occurred in the period January 2005 – up to now shows a sporadic, rather diffuse background seismicity marked by small magnitude seismic sequences strongly clustered in time and space. The most important sequences occurred in September-October 2005 (M=3.2) and August-September 2006 (M=3.7), nearby the towns of Macerata Feltria and Casteldelci, respectively. The spatio-temporal evolution of these main episodes highlights an energy release consistent with swarm-like activity. Others clusters of less intensity and duration were observed in January 2011 (ML 2.2, 15 events), September 2012 (ML 2.8, 6 events), and July 2015 (ML 2.3, 10 events). These bursts are confined in the upper crust contrary to the swarm-like seismicity which extends up to ~25 km depth. Another major feature of the seismicity pattern is represented by the occurrence of events even in the lower crust and in the upper mantle down to at least 50 km depth.
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