1,721,033 research outputs found
Shape: A Matlab software package for time-dependent seismic hazard analysis
No full textMany seismic processes, in particular, those induced by technological activities for exploitation of georesources, are time dependent. The changes in time of the seismicity cause that the related seismic hazard changes in time as well. We present here the Seismic HAzard Parameters Evaluation (SHAPE) tool, which enables an assessment of the temporal changes of the mean return period (MRP) of a seismic event of a given magnitude and the exceedance probability (EP) of a given magnitude within a predefined time period. SHAPE is an open‐source software package, written in MATLAB (see Data and Resources), based on the online probabilistic seismic hazard analysis applications available on IS‐EPOS platform of thematic core service anthropogenic hazards of European Plate Observing System (EPOS). SHAPE is developed in two standalone versions allowing the user to select a variety of options and parameters to determine the values of EP and MRP, assuming different magnitude distribution models. The first software version (SHAPE_ver1) provides interactive parameter selection and data filtering through a graphical user interface environment, whereas the second wrapper‐script‐based version (SHAPE_ver2) allows fast implementation and fine‐tuning of parameters. The program is particularly useful for anthropogenic seismicity cases, to monitor the changes of seismic response to technological operations, and to control the effectiveness of the undertaken hazard mitigation measures. As an example, two applications of SHAPE in case studies from the northwestern part of The Geysers geothermal field, California, and Song Tranh 2 surface water reservoir, Vietnam, are demonstrated
The monitoring of induced seismicity: observations, models and interpretations.
No full textPresentazione critica dei lavori pubblicati nella rivista in qualita' di editore associat
Assessing environmental footprints induced by geo-energy exploitation: the shale gas case
No full textThis Special Issue describes the main outcomes from the SHEER (SHale gas Exploration and Exploitation induced Risks)
project, a 3 year EC Horizon 2020 funded investigation into environmental risk associated with shale oil and gas development
within the European Union. A key feature of the programme of work has been the independent monitoring of a shale
gas well at Wysin, Poland, through a network of seismic, groundwater and air quality measurement arrays and shallow
borehole sensors both in advance of and subsequent to hydraulic fracturing operations. In conjunction with the environmental
monitoring programme, a multi-hazard risk assessment technique has been applied to shale gas operations to identify
and assess the likelihood of occurrence of incidents and their potential impacts on the surrounding environment. Given the
limited development of shale oil and gas in Europe experience out-with the European Union, particularly in the USA and
Canada, has been integrated into the project. A further element of the research has been the dissemination of results through
academic publications, a large number of presentations to conferences and at SHEER events in Italy, Poland and the UK.
This introductory paper provides a brief synopsis of the research and development that has been carried out, with a primary
focus on the best practice recommendations, policy guidelines and key learning that have been developed during the course
of the project. Policy guidelines include issues of relevance to regulators and government in providing effective regulatory
oversight of shale gas operations within the European Union. Recommendations for best practice are primarily related to the
monitoring and evaluation of environmental risk in the development of shale gas within the European Union
The sheer approach to shale gas exploration and exploitation associated risks
No full textThe abstract presents the SHEER project that primarily aims at assessing the environmental impacts of shale gas extraction and exploration, and secondly, at developing best practices to reduce its environmental footprint. The description of SHEER database comprising multidisciplinary data concerning the shale gas exploitation test sites, processing procedures, results of data interpretation and recommendation as well as other documents describing the state of the art is included. One of the test sites is the real-time research monitoring field at Wysin, Pomerania, where the hydraulic fracturing took place. The seismic monitoring main aim was to detect microseismic events at the fracturing site and therefore contribute to a better characterization of the induced seismicity related to the shale gas extraction Finally, a collaboration between SHEER and IS-EPOS project is presented within the Thematic Core Services-Anthropogenic Hazard e-Platform
Non-stationarity and internal correlations of the occurrence process of mining-induced seismic events
Full text linkA point process, e.g., the seismic process, is potentially predictable when it is non-stationary, internally correlated or both. In this paper, an analysis of the occurrence process of mining-induced seismic events from Rudna copper mine in Poland is presented. Stationarity and internal correlation are investigated in complete seismic time series and segmentally in subseries demonstrating relatively stable seismicity rates. It is shown that the complete seismic series are non-stationary; however, most of their shorter subseries become stationary. In the stationary subseries, the distribution of interevent time is closer to the exponential distribution, which is characteristic for the Poisson process. However, in most of these subseries, the differences between the interevent time and Poisson distributions are still significant, revealing correlations among seismic events
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Evidences of Complexity of Magnitude Distribution, Obtained from a Non-Parametric Testing Procedure
No full textEvidences of Complexity of Magnitude Distribution, Obtained from a Non-Parametric Testing ProcedureIstituto Nazionale di Geofisica e Vulcanologia (INGV), Rome, Italy
Institute of Statistical Mathematics (ISM), Tokyo, Japan
Swiss Seismological Service, Institute of Geophysics (ETH), Zürich, SwitzerlandUnpublishedErice, Italyope
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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