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Storms of Crustal Stress and Ae Earthquake Precursors : Volume 10, Issue 2 (17/02/2010)

By Gregori, G. P.

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Book Id: WPLBN0003990697
Format Type: PDF Article :
File Size: Pages 19
Reproduction Date: 2015

Title: Storms of Crustal Stress and Ae Earthquake Precursors : Volume 10, Issue 2 (17/02/2010)  
Author: Gregori, G. P.
Volume: Vol. 10, Issue 2
Language: English
Subject: Science, Natural, Hazards
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2010
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Rafanelli, C., Simone, S. D., Paparo, G., Poscolieri, M., Ventrice, G., & Gregori, G. P. (2010). Storms of Crustal Stress and Ae Earthquake Precursors : Volume 10, Issue 2 (17/02/2010). Retrieved from http://worldpubliclibrary.org/


Description
Description: IDAC – Istituto di Acustica O. M. Corbino (CNR), via Fosso del Cavaliere 100, 00133 Rome, Italy. Acoustic emission (AE) displays violent paroxysms preceding strong earthquakes, observed within some large area (several hundred kilometres wide) around the epicentre. We call them storms of crustal stress or, briefly crustal storms. A few case histories are discussed, all dealing with the Italian peninsula, and with the different behaviour shown by the AE records in the Cephalonia island (Greece), which is characterized by a different tectonic setting.

AE is an effective tool for diagnosing the state of some wide slab of the Earth's crust, and for monitoring its evolution, by means of AE of different frequencies. The same effect ought to be detected being time-delayed, when referring to progressively lower frequencies. This results to be an effective check for validating the physical interpretation.

Unlike a seismic event, which involves a much limited focal volume and therefore affects a restricted area on the Earth's surface, a crustal storm typically involves some large slab of lithosphere and crust. In general, it cannot be easily reckoned to any specific seismic event. An earthquake responds to strictly local rheological features of the crust, which are eventually activated, and become crucial, on the occasion of a crustal storm. A crustal storm lasts typically few years, eventually involving several destructive earthquakes that hit at different times, at different sites, within that given lithospheric slab.

Concerning the case histories that are here discussed, the lithospheric slab is identified with the Italian peninsula. During 1996–1997 a crustal storm was on, maybe elapsing until 2002 (we lack information for the period 1998–2001). Then, a quiet period occurred from 2002 until 26 May 2008, when a new crustal storm started, and by the end of 2009 it is still on. During the 1996–1997 storm two strong earthquakes occurred (Potenza and Colfiorito) – and (maybe) in 2002 also the Molise earthquake can be reckoned to this storm. During the storm, started in 2008, the l'Aquila earthquake occurred.

Additional logical analysis envisages the possibility of distinguishing some kind of elementary constituents of a crustal storm, which can be briefly called crustal substorms. The concept of storm and substorm is a common logical aspect, which is shared by several phenomena, depending on their common intrinsic and primary logical properties that can be called lognormality and fractality. Compared to a crustal storm, a crustal substorm is likely to be reckoned to some specific seismic event. Owing to brevity purposes, however, the discussion of substorms is given elsewhere.

AE is an effective tool for monitoring these phenomena, and other processes that are ongoing within the crust. Eventually they result to be precursors of some more or less violent earthquake. It should be stressed, however, that the target of AE monitoring is diagnosing the Earth's crust. In contrast, earthquake prediction implies a much different perspective, which makes sense only by means of more detailed multiparametric monitoring. An AE array can provide real physical information only about the processes that are objectively ongoing inside different and contiguous large slabs of the crust. The purpose is to monitor the stress propagation that crosses different regions, in order to envisage where an


Summary
Storms of crustal stress and AE earthquake precursors

Excerpt
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