Intraslab versus Interplate Earthquakes as Recorded in Mexico City: Implications for Seismic Hazard

2015 ◽  
Vol 31 (2) ◽  
pp. 795-812 ◽  
Author(s):  
Shri K. Singh ◽  
Mario Ordaz ◽  
Xyoli Pérez-Campos ◽  
Arturo Iglesias
Keyword(s):  
Seismic Hazard ◽  
Mexico City ◽  
Return Period ◽  
High Frequency ◽  
Relative Importance ◽  
The Hill ◽  
The City ◽  
Careful Assessment ◽  
Interplate Earthquakes

We study the relative importance of interplate and intraslab earthquakes in the seismic hazard of Mexico City by analyzing accelerograms recorded at the hill-zone site of CU (1964–2012) and the lake-bed site of SCT (1985–2012). Amax exceeded 6 gal during 20 earthquakes at CU during this period. Of these, eight were intraslab events so that the exceedance rate of Amax ≥ 6 gal from both types of earthquakes is roughly about the same. The estimated return period of Amax of 30 gal from the two types of earthquakes is ∼100 yrs. If we consider high-frequency (2.5–8.5 Hz) acceleration ( AmaxHF) at CU, then the top 7 out of the 20 events are all intraslab earthquakes. Even at the lake-bed site of SCT, the AmaxHF values are, generally, associated with intraslab earthquakes. It follows that the risk from both types of earthquakes to low-rise construction in the city needs careful assessment.

The City Below The Hill

1972 ◽  
Author(s):  
Herbert Brown Ames ◽  
Paul Rutherford
Keyword(s):  
The Hill ◽  
The City

Rebuilding the City on the Hill

2012 ◽  
Author(s):  
Chad M. Brooks
Keyword(s):  
The Hill ◽  
The City

scholarly journals Virtual Sound Field of the Roman Theatre of Malaca

Acoustics ◽  
2021 ◽  
Vol 3 (1) ◽  
pp. 78-96
Author(s):  
Javier Alayón ◽  
Sara Girón ◽  
José A. Romero-Odero ◽  
Francisco J. Nieves
Keyword(s):  
3D Model ◽  
Sound Field ◽  
Acoustic Properties ◽  
Archaeological Remains ◽  
Roman Emperor ◽  
Stone Surface ◽  
Process Adjustment ◽  
Decay Parameters ◽  
The Hill ◽  
The City

In Hispania (present-day Spain and Portugal), there are 25 structures documented of classical Roman open-air theatres, of which 10 are in the south, in the Roman Baetica (Andalusia). The Baetica embraced the progress of urbanisation in the time of the Roman emperor Augustus, where theatres, built in stone, were the foci of entertainment, performance, and propaganda of the empire. The Roman theatre in Malaga presents the archaeological remains of the main vestige of the Roman Malaca. It is located in the historical centre of the city, at the foot of the hill of the Muslim Alcazaba and was discovered in 1952. It is a medium-sized theatre whose design corresponds to a mixed construction that combines making use of the hillside for the terraces, in the manner of Greek theatres, with a major construction where rock is non-existent, thereby creating the necessary space for the stands. In this paper, the production process, adjustment, and validation of the 3D model of the theatre are analysed for the creation of a numerical predictive model of its sound field. Acoustic properties of the venue are examined and the effect of the Muslim Alcazaba and the hillside on the various acoustic descriptors is analysed. The results highlight the influence of this large stone surface mainly on the time decay parameters.

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.

Outreach in Major American Cities

1980 ◽  
Vol 10 (3-4) ◽  
pp. 9-12
Author(s):  
Donald J. Cosentino
Keyword(s):  
San Francisco ◽  
Ad Hoc ◽  
State University ◽  
Cultural Institutions ◽  
Dense Population ◽  
Jane Jacobs ◽  
Political Processes ◽  
The Hill ◽  
American Cities ◽  
The City

The question immediately suggests itself: what constitutes a major American city? Subjectively, but with a long side glance at Jane Jacobs, I would define such a metropolitan area by several attributes. One obviously is population density, though the actual number of people that make up the city is less important than the diversity within the population that allows for a great diversity in culture. Major American cities are composed of many cultural, racial, and economic constituencies coexisting in a single polity. Thus, even though Peoria and San Francisco are dense population centers, one is a major farm town, and the other is a major city. This multiplicity of ethnic constituencies is reflected in a city’s educational, economic, religious, political, and cultural institutions which are likewise fragmented, though interdependent. Such cities with enormous and highly diverse constituencies are likely to be more self-sufficient culturally, politically, and economically than other American towns. They supply their own news and publications, stage their own cultural events, concentrate more on their own political processes, and establish autonomous norms of behavior. In fact, what happens in these cities more often creates the news, the culture, the mores, and the politics for the rest of the land. A university operating in such a milieu is not just a light on the hill. It is a constituency within a mosaic of constituencies. It is linked to those other constituencies politically, socially, culturally, and economically, just by being where it is. It must frequently act on an ad hoc basis, responding to requests and solicitations that are sometimes immediate, and sometimes imperative. The parameters of its actions are clearly traceable in the mosaic of relationships which describe the city. It is not as free as the state university in the college town to define its own program, but by its existential commitment to its locale it draws whatever important qualities it will have for itself, for its community, and for the nation.

Art. VII.—An Account of Jerusalem, translated for the late Sir H. M. Elliot, from the Persian text of Náṣir ibn Khusrú's Safarnámah

1873 ◽  
Vol 6 (1) ◽  
pp. 142-164
Author(s):  
A. R. Fuller
Keyword(s):  
The Other ◽  
The Road ◽  
On The Road ◽  
The Hill ◽  
The City

On the 3rd of Ramazán, I left Ramlah, and went to a village called Khátún, and from thence to another, which they styled Kariatu-l-'Anab (Grape hamlet). On the road I observed plenty of wild rue growing spontaneously on hill and dale. I also noticed at this village a very delightful spring of water gushing out of a rock, where they had constructed reservoirs, and built edifices. From thence I proceeded up some rising ground, under the impression that I was ascending a hill, and that on going down the other side the city would lie before me. After I had climbed the ascent however for a short way, a vast wilderness lay in my front, partly stony, and partly showing merely the bare earth. At the summit of the hill stands the city of the “Baitu-l-Mukaddas” (Sacred Tabernacle, i.e. Jerusalem), between which and Tarábulis, whichis on the coast, are 56 parasangs, and from Balkh to Jerusalem 876.

ENLIGHTENMENT AND REVOLUTION: NAPLES 1799

2000 ◽  
Vol 10 ◽  
pp. 17-44 ◽  
Author(s):  
John Robertson
Keyword(s):  
French Revolution ◽  
Military Intervention ◽  
Northern Italy ◽  
French Military ◽  
The Hill ◽  
The City

AbstractTWO hundred years ago today, on 22 January 1799, French troops forced their way into the city of Naples. In doing so, they confirmed the authority of the Neapolitan Republic which had been proclaimed, one and indivisible, the day before by a group of patriots who had taken control of the Castel Sant'Elmo, the fortress on the hill immediately above the centre of the city. Thus began the last of the revolutions which can be regarded as the offspring of the great French Revolution of 1789. There is no denying that the Neapolitan Revolution, like its predecessors in northern Italy and elsewhere, depended on French military intervention. The patriots were not in control of the city before 22 January, and needed the French to quell the popular violence and disorder which had swept the city for the previous week. And when, after three months, the French withdrew their forces, the republicans' hold on the city was too precarious to last more than a few weeks.

scholarly journals Paleontological rescue, depositional environment, and stratigraphic correlation of a section of the Ponta Grossa Formation (Paraná Basin)

Terr Plural ◽  
2021 ◽  
Vol 15 ◽  
pp. e2119456
Author(s):  
Elvio Pinto Bosetti ◽  
◽  
Lucinei Jose Myszynski Junior ◽  
Daniel Sedorko ◽  
Luana Oliveira ◽  
...  
Keyword(s):  
High Frequency ◽  
Depositional Environment ◽  
Depositional Environments ◽  
Integrated Analysis ◽  
Stratigraphic Correlation ◽  
Paleontological Heritage ◽  
Paraná Basin ◽  
Specialized Team ◽  
Parana Basin ◽  
The City

The urban area of Ponta Grossa (PR) occurs on one of the most abundant fossiliferous fields in the country, which records an endemic fauna that occurred in the Devonian of the Paraná Basin. The growing urbanization of the city increasingly buries these outcrops, and new works must be accompanied by a specialized team to safeguard the paleontological heritage. This is the case of the Bosque Mistral project, which exposed many layers of the Ponta Grossa Formation, rich in fossils and trace fossils. This study reports the main fossiliferous occurrences in the section, correlates the section with classical outcrops from the literature, and interprets the main depositional environments as well stratigraphic cycles using an integrated analysis of sedimentology and ichnology. The ichnological distribution also evidences the retrogradation pattern, and, particularly, the occurrence of ichnofabrics dominated by Zoophycos at the top of the section is a signature of high-frequency cycles associated with the transgressive systems tract. Macrofossill biodiversity varies according to the facies, in the sandy and silty layers different organisms from the muddy layers occur. In the former, the epibiont fauna (mainly trilobites and brachiopods) is predominant while in the muddy layers the predominance is the endobiont and semi-endobiont fauna (bivalve mollusks and infaunal brachiopods). In other words, the distribution of taxa across the layers is not random.

scholarly journals Experiencia urbana e imágenes colectivas de la Ciudad de México / Urban Experience and Collective Images in Mexico City

2006 ◽  
Vol 21 (3) ◽  
pp. 663
Author(s):  
Martha De Alba
Keyword(s):  
Mexico City ◽  
Functional Space ◽  
Cognitive Maps ◽  
Federal District ◽  
The Other ◽  
Urban Experience ◽  
Distrito Federal ◽  
Urban Imagination ◽  
The One ◽  
The City

En el presente artículo se estudia el imaginario urbano de la Ciudad de México valiéndose de la comparación de la perspectiva de una muestra de residentes del Distrito Federal con otra muestra de funcionarios encargados de la gestión de la metrópoli. Se parte del supuesto de que las imágenes que esta gran ciudad suscita corresponden a dos registros distintos: por un lado la experiencia urbana captada a través del discurso sobre la ciudad y por el otro las imágenes cartográficas que se materializan en mapas cognitivos del espacio. Se presentan aquí los resultados de estas dos perspectivas complementarias de análisis de las representaciones de la ciudad y se propone una metodología para su estudio. Asimismo se analiza si la vivencia y la representación de la ciudad corresponden a las propuestas teóricas que plantean que la metrópoli contemporánea ya no es más un lugar de convivencia, sociabilidad e identidad, sino que se ha convertido en un espacio únicamente funcional. AbstractThis article studies the urban imagination in Mexico City, using the comparison of the perspective of a sample of residents from the Federal District with another sample of functionaries in charge of managing the metropolis. It begins with the assumption that the images this great city evokes correspond to two different registers: on the one hand, the urban experience recorded through the discourse on the city and on the other, the cartographic images materialized in cognitive maps of space. This article presents the results of these two complementary methods of analyzing the representations of the city and proposes a methodology for studying them. It also analyzes whether the experience and the representation of the city correspond to the theoretical proposals suggesting that the contemporary metropolis is no longer a place of coexistence, sociability and identity but has become a purely functional space.

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