Evidence of Low-Frequency Amplification in the City of L'Aquila, Central Italy, through a Multidisciplinary Approach Including Strong- and Weak-Motion Data, Ambient Noise, and Numerical Modeling

2005 ◽  
Vol 95 (4) ◽  
pp. 1469-1481 ◽  
Author(s):  
G. De Luca
Keyword(s):  
Numerical Modeling ◽  
Ambient Noise ◽  
Multidisciplinary Approach ◽  
Central Italy ◽  
Low Frequency ◽  
Motion Data ◽  
The City

scholarly journals Magnetic anomalies possibly linked to local low seismicity

2009 ◽  
Vol 9 (5) ◽  
pp. 1567-1572 ◽  
Author(s):  
F. Masci ◽  
P. Palangio ◽  
M. Di Persio
Keyword(s):  
Geomagnetic Field ◽  
Central Italy ◽  
Low Frequency ◽  
Magnetic Anomalies ◽  
Tectonic Activity ◽  
The Past ◽  
Tectonic Events ◽  
The City ◽  
Network Station ◽  
The Magnetic Field

Abstract. During the last twenty years a time-synchronized network of magnetometers has operated in Central Italy along the Apennine chain to monitor the magnetic field anomalies eventually related to the tectonic activity. At present time the network consists of five stations. In the past only few anomalies in the local geomagnetic field, possibly associated to earthquakes, has been observed, not least because the network area has shown a low-moderate seismic activity with the epicentres of the few events with Ml≥5 located away from the network station. During 2007 two Ml≈4 earthquakes occurred in proximity of two stations of the network. Here we report the magnetic anomalies in the geomagnetic field that could be related with these tectonic events. To better investigate these two events a study of ULF (ultra-low-frequency) emissions has been carried out on the geomagnetic field components H, D, and Z measured in L'Aquila Observatory during the period from January 2006 to December 2008. We want to stress that this paper refers to the period before the 2009 L'Aquila seismic sequence which main shock (Ml=5.8) of 6 April heavily damaged the medieval centre of the city and surroundings. At present time the analysis of the 2009 data is in progress.

scholarly journals A Proposed Framework for Identification of Indicators to Model High-Frequency Cities

2021 ◽  
Vol 10 (5) ◽  
pp. 317
Author(s):  
Ahmad M. Senousi ◽  
Junwei Zhang ◽  
Wenzhong Shi ◽  
Xintao Liu
Keyword(s):  
Urban Studies ◽  
Traffic Congestion ◽  
High Frequency ◽  
Urban Policy ◽  
Low Frequency ◽  
Highway Design ◽  
City Life ◽  
Cultural Affiliation ◽  
Internal Mobility ◽  
The City

A city is a complex system that never sleeps; it constantly changes, and its internal mobility (people, vehicles, goods, information, etc.) continues to accelerate and intensify. These changes and mobility vary in terms of the attributes of the city, such as space, time and cultural affiliation, which characterise to some extent how the city functions. Traditional urban studies have successfully modelled the ‘low-frequency city’ and have provided solutions such as urban planning and highway design for long-term urban development. Nevertheless, the existing urban studies and theories are insufficient to model the dynamics of a city’s intense mobility and rapid changes, so they cannot tackle short-term urban problems such as traffic congestion, real-time transport scheduling and resource management. The advent of information and communication technology and big data presents opportunities to model cities with unprecedented resolution. Since 2018, a paradigm shift from modelling the ‘low-frequency city’ to the so-called ‘high-frequency city’ has been introduced, but hardly any research investigated methods to estimate a city’s frequency. This work aims to propose a framework for the identification and analysis of indicators to model and better understand the concept of a high-frequency city in a systematic manner. The methodology for this work was based on a content analysis-based review, taking into account specific criteria to ensure the selection of indicator sets that are consistent with the concept of the frequency of cities. Twenty-two indicators in five groups were selected as indicators for a high-frequency city, and a framework was proposed to assess frequency at both the intra-city and inter-city levels. This work would serve as a pilot study to further illuminate the ways that urban policy and operations can be adjusted to improve the quality of city life in the context of a smart city.

Meteorological conditions influence on quantification of site effects at low frequency using the seismic ambient noise

2015 ◽  
Author(s):  
Rabah Bensalem* ◽  
Djamal Machane ◽  
Jean-Luc Chatelain ◽  
Mohamed Djeddi ◽  
Hakim Moulouel ◽  
...  
Keyword(s):  
Site Effects ◽  
Ambient Noise ◽  
Low Frequency ◽  
Meteorological Conditions ◽  
Seismic Ambient Noise

III. Villanovan Veii

1961 ◽  
Vol 29 ◽  
pp. 20-25 ◽  
Author(s):  
J. B. Ward-Perkins
Keyword(s):  
Bronze Age ◽  
Iron Age ◽  
Late Antiquity ◽  
Central Italy ◽  
Early Iron Age ◽  
Long Period ◽  
The Social ◽  
Precise Relationship ◽  
Relationship Of ◽  
The City

The roads and gates described in the previous section are of very varied dates, and many of them were in use over a long period. They have been described first because they constitute the essential framework for any serious topographical study of Veii. Within this framework the city developed, and in this and the following sections will be found described, period by period, the evidence for that development, from the first establishment of Veii in Villanovan times down to its final abandonment in late antiquity.Whatever the precise relationship of the Villanovan to the succeeding phases of the Early Iron Age in central Italy in terms of politics, race or language, it is abundantly clear that it was within the Villanovan period that the main lines of the social and topographical framework of historical Etruria first took shape. Veii is no exception. Apart from sporadic material that may have been dropped by Neolithic or Bronze Age hunters, there is nothing from the Ager Veientanus to suggest that it was the scene of any substantial settlement before the occupation of Veii itself by groups of Early Iron Age farmers, a part of whose material equipment relates them unequivocally to the Villanovan peoples of coastal and central Etruria.

Characteristics of strong ground motion data recorded in the Gubbio sedimentary basin (Central Italy)

2006 ◽  
Vol 5 (1) ◽  
pp. 27-43 ◽  
Author(s):  
F. Pacor ◽  
D. Bindi ◽  
L. Luzi ◽  
S. Parolai ◽  
S. Marzorati ◽  
...  
Keyword(s):  
Ground Motion ◽  
Strong Ground Motion ◽  
Sedimentary Basin ◽  
Central Italy ◽  
Motion Data ◽  
Strong Ground

scholarly journals Detection of infrasound by the Atlantic cod

1986 ◽  
Vol 125 (1) ◽  
pp. 197-204 ◽  
Author(s):  
O. Sand ◽  
H. E. Karlsen
Keyword(s):  
Ambient Noise ◽  
Atlantic Cod ◽  
Low Frequency ◽  
Directional Pattern ◽  
Frequency Noise ◽  
Threshold Values ◽  
Sensory Inputs ◽  
A Value ◽  
Cardiac Conditioning ◽  
Lower Frequencies

Below about 50 kHz the level of ambient noise in the sea increases continuously towards lower frequencies. In the infrasound range the spectral slope is particularly steep. This low-frequency noise may propagate long distances with little attenuation, causing a directional pattern of infrasound in the sea. Using a standing-wave acoustic tube, we have studied the sensitivity of cod to infrasound down to 0.1 Hz by means of the cardiac conditioning technique. The threshold values, measured as particle acceleration, showed a steady decline towards lower frequencies below 10 Hz, reaching a value close to 10(−5)ms-2 at 0.1 Hz. The spectrum level at 0.1 Hz in the sea ranges between 120 and 180 dB (re 1 microPa), with corresponding particle accelerations from less than 10(−6) to more than 10(−4)ms-2. The sensitivity of cod is thus sufficient to detect the highest levels of ambient infrasound, and we put forward the hypothesis that fish may utilize information about the infrasound pattern in the sea for orientation during migration, probably in addition to an array of other sensory inputs.

scholarly journals Bioarchaeological insights into the last plague of Imola (1630–1632)

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Meriam Guellil ◽  
Natascia Rinaldo ◽  
Nicoletta Zedda ◽  
Oliver Kersten ◽  
Xabier Gonzalez Muro ◽  
...  
Keyword(s):  
Yersinia Pestis ◽  
Patient Outcomes ◽  
Multidisciplinary Approach ◽  
Genomic Data ◽  
Northern Italy ◽  
Mass Mortality ◽  
Metagenomic Analysis ◽  
Mass Graves ◽  
Physical Trauma ◽  
The City

AbstractThe plague of 1630–1632 was one of the deadliest plague epidemics to ever hit Northern Italy, and for many of the affected regions, it was also the last. While accounts on plague during the early 1630s in Florence and Milan are frequent, much less is known about the city of Imola. We analyzed the full skeletal assemblage of four mass graves (n = 133 individuals) at the Lazaretto dell’Osservanza, which date back to the outbreak of 1630–1632 in Imola and evaluated our results by integrating new archival sources. The skeletons showed little evidence of physical trauma and were covered by multiple layers of lime, which is characteristic for epidemic mass mortality sites. We screened 15 teeth for Yersinia pestis aDNA and were able to confirm the presence of plague in Imola via metagenomic analysis. Additionally, we studied a contemporaneous register, in which a friar recorded patient outcomes at the lazaretto during the last year of the epidemic. Our multidisciplinary approach combining historical, osteological and genomic data provided a unique opportunity to reconstruct an in-depth picture of the last plague of Imola through the city's main lazaretto.

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