1,721,273 research outputs found
Valorizzazione dei prodotti tipici e turismo rurale: considerazioni sulle filiere corte
No full textIl ruolo delle filiere corte dei prodotti tipici nello sviluppo dei comprensori rurali è indagato con riferimento ad un contesto territoriale circoscritto. Le indicazioni formulate conseguono dalla caratterizzazione degli acquirenti disponibili a recarsi in azienda per acquistare un particolare prodotto tipico (pomodorino di Corbara). Gli strumenti statistici utilizzati sono l'analisi delle corrispondenze multiple e i modelli a scelta discreta
ON THE PRESUMED ULF MAGNETIC PRECURSORS OF EARTHQUAKES
No full textDuring the last twenty years many researchers investigated ULF (Ultra-Low-
Frequency) magnetic data in the hope of finding seismogenic signals. After the report of Fraser- Smith et al. (1990) several ULF stations were installed and many papers documented the observations of pre-earthquake magnetic anomalies. These claims motivate the belief that one day
short-term earthquake prediction based on magnetic data may become a routine technique. Shortterm earthquake prediction has been the topic of several scientific debates but at present the entire subject remains still controversial. In order to be useful, short-term prediction requires reproducible earthquake precursors which provide information regarding intensity, location and time of the predicted earthquake together with error estimates for each parameter. Thus, a serious problem
concerns the identification of reliable earthquake precursors. Recently, some researchers have given rise to a re-examination process of dubious earthquake precursors and published their findings. For
example Masci (2010, 2011a), by means of global geomagnetic Kp index time-series, demonstrated that many presumed magnetic seismogenic signatures are not related to the subsequent earthquakes but are normal variations driven by the geomagnetic activity level. More precisely, as pointed out by Masci (2011a, 2012a), since the Kp index is representative of the geomagnetic field average disturbances over planetary scale, we should not expect that a good correlation between an ULF parameter of the geomagnetic field and Kp will always and everywhere exist during a long-time range. On the contrary, if a close correspondence between these changes of an ULF geomagnetic
field parameter and Kp exists during a period of time, this indicates that the changes are part of normal global geomagnetic field variations driven by solar-terrestrial interactions and cannot be
described as earthquake-related signals.
Here, some examples of questioned earthquake precursors are reported hoping to shed light on the usefulness of the ULF magnetic measurements to study the occurrence of pre-earthquake seismogenic signals. In addition, the results of the analysis of magnetic data from the Geomagnetic Observatory of L’Aquila during the period of the 2009 L’Aquila seismic sequence are reported as well.PublishedPotenza, 20-22 novenber 20122.6. TTC - Laboratorio di gravimetria, magnetismo ed elettromagnetismo in aree attiveope
Comment on "Ultra Low Frequency (ULF) European multi station magnetic field analysis before and during the 2009 earthquake at L'Aquila regarding regional geotechnical information" by Prattes et al. (2011)
No full textPrattes et al. (2011) report ULF magnetic anomalous signals claiming them to be possibly precursor of the 6 April 2009 <i>M</i><sub>W</sub> = 6.3 L'Aquila earthquake. This comment casts doubts on the possibility that the observed magnetic signatures could have a seismogenic origin by showing that these pre-earthquake signals are actually part of normal global geomagnetic activity
Prodotti tipici e sviluppo rurale: indicazioni metodologiche a partire da un caso studio
No full textIl ruolo dei prodotti tipici nella promozione dello sviluppo socio-economico delle aree rurali si esprime attraverso gli effetti diretti e indiretti sull’evoluzione strutturale dell’economia locale. Il lavoro si articola in una proposta di tipologia delle aziende agricole di produzione del prodotto tipico (ACM analysis and clustering) e nell'analisi della disponibilità ad aumentare la produzione da parte delle aziende e per i consumatori in quella ad acquistare in azienda (discrete choice models). Nelle conclusioni sono raccolte le principali indicazioni metodologiche e operative per formulare iniziative rivolte alle aziende e ai consumatori al fine di delineare strategie di valorizzazione del prodotto
Algorithms for the inversion of lidar signals: Rayleigh-Mie measurements in the stratosphere
No full textWe report the features and the performances of the algorithms, developed at the Lidar Station of L'Aquila, for retrieving atmospheric parameters and constituents from elastic lidar signals. The algorithm for ozone retrieving is discussed in detail and checked with model lidar signals to take into account the numerical distortion on the profile. The performances of the aerosol backscattering ratio algorithm that includes the transmission loss due to the aerosol extinction are evaluated. A new algorithm developed to retrieve atmospheric temperature profiles from elastic lidar returns in the altitude range 30-90 km is also examined in detail.JCR Journalope
Un'impronta digitale individuale del sonno umano: la topografia antero-posteriore delle frequenze EEG intermedie.
No full textBrief communication "On the recent reaffirmation of ULF magnetic earthquakes precursors"
Full text linkHayakawa et al. (2009) and Hayakawa (2011) have recently reviewed some "anomalous" ULF signatures in the geomagnetic field which previous publications have claimed to be earthquake precursors. The motivation of this review is "<i>to offer a further support to the definite presence of those anomalies</i>". Here, these ULF precursors are reviewed once again. This brief communication shows that the reviewed anomalies do not "<i>increase the credibility on the presence of electromagnetic phenomena associated with an earthquake</i>" since these anomalous signals are actually caused by normal geomagnetic activity. Furthermore, some of these ULF precursors have just been rebutted by previous publications
On the ULF magnetic ratio increase before the 2008 Iwate–Miyagi Nairiku earthquake by Hirano and Hattori (2011)
No full textHirano and Hattori (2011), hereafter cited as H&H, report the observation of anomalous increases in the ULF geomagnetic field spectral density ratio which the authors claim to be possible precursors of the
2008 Iwate–Miyagi Nairiku earthquake. Here the results of H&H are reviewed taking into account the global geomagnetic activity level by means ofPKp index. This paper cast serious doubts on the seismogenic origin of the magnetic signatures documented by H&H showing that the anomalous signals are normal
ULF magnetic variations induced by solar–terrestrial interaction. In summary, H&H’s claims that magnetic field disturbances about a month before the Mw 6.9 Iwate–Miyagi Nairiku earthquake on June 13, 2008 are precursors to the earthquake are unlikely to be correct.Published258-2622.6. TTC - Laboratorio di gravimetria, magnetismo ed elettromagnetismo in aree attiveJCR Journalrestricte
Comment on ‘‘Possible association between anomalous geomagnetic variations and the Molise Earthquakes at Central Italy during 2002’’ by Takla et al. (2011)
No full textTakla et al. (2011) documented the observation of seismogenic precursory signals in the geomagnetic field components of L’Aquila station (LAQ) which occurred before the 2002 Molise earthquakes. Here,
these claims are reviewed taking into account the geomagnetic index ΣKp time-series and by means of data coming from the Geomagnetic Observatory of L’Aquila where the LAQ station is located. This
review shows that before the Molise earthquakes the anomalous behaviour of LAQ geomagnetic field components was actually caused by a possible thermal drift of the instrumentation. In conclusion there is no firm relation between the earthquakes occurrence and the observed magnetic anomalous signatures documented by Takla et al. (2011).Published92-942.6. TTC - Laboratorio di gravimetria, magnetismo ed elettromagnetismo in aree attiveJCR Journalpartially_ope
The study of ionospheric anomalies in Japan area during 1998–2010 by Kon et al.: An inaccurate claim of earthquake-related signatures?
No full textThe problem of identifying precursory signals of earthquakes in the hope of mitigate the seismic hazard is a very important topic, but inaccurate documentations of precursory signatures decrease the credibility of this field of research. The statistical analysis by Kon et al. (2011) shows that there is tendency of positive total electron content (TEC) anomalies to occur 1–5 days before 52 M > 6 earthquakes which struck Japan during 1998–2010. Kon et al. (2011) also report in detail three selected case studies claiming the occurrence of TEC anomalies possibly related to large and destructive earthquakes. This paper casts doubts on the possibility that in the three cases the TEC disturbances were caused by seismic events suggesting that these TEC changes could be induced by normal variations of the global geomagnetic activity.
As a consequence, also the results of the Superimposed Epoch Analysis performed by Kon et al. (2011) could be seriously influenced by global magnetospheric signals.Published1-52.6. TTC - Laboratorio di gravimetria, magnetismo ed elettromagnetismo in aree attiveJCR Journalpartially_ope
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