scholarly journals On the recovery and analysis of historical seismograms

2013 ◽  
Vol 56 (3) ◽  
Author(s):  
Barbara Palombo ◽  
Nicola Alessandro Pino
Keyword(s):  
Seismic Risk ◽  
Standard Technique ◽  
Source Area ◽  
Seismic Source ◽  
Correct Interpretation ◽  
Source Information ◽  
Specific Analysis ◽  
Quality And Reliability ◽  
Definition Of ◽  
Historical Seismograms

The analysis of historical seismograms has proven to be a fundamental tool to help with the definition of the seismic risk in specific regions. Indeed, modern quantitative reappraisal of relevant earthquakes that occurred before the 1960’s; i.e., prior to both the developments of modern recording instruments and the theoretical progress, has been essential for the assessment of the seismic potential of a source area. However, due to the characteristics (transducing and recording) of the old analog seismographs, the data available are affected by intrinsic uncertainties, and errors can be introduced during the processing of waveform digitization. These drawbacks can seriously influence the quality and reliability of an investigation. In general, no standard technique can be applied when dealing with historical seismograms. Thus, specific tests and cross-checks have to be designed to estimate the limits of each specific analysis. Here, we aim to provide an overview of the whole procedure while focusing on the most crucial steps, from the seismogram recovery to the application of modern techniques for the retrieval of the seismic source information. We also suggest possible checks for the robustness of the data and for the available instrument characteristics, with a description of the effects of various uncertainties on the results that can be obtained. We thus provide useful indications for the analysis of historical seismograms, and also for the correct interpretation of the resulting characteristics of the seismic source.

Wave propagation simulation on a 3D model of the Ruhr district for locations of seismic monitoring.

2021 ◽  
Author(s):  
Gabriela de los Angeles Gonzalez de Lucio ◽  
Claudia Finger ◽  
Erik Saenger
Keyword(s):  
Wave Propagation ◽  
Seismic Risk ◽  
Structural Model ◽  
Three Dimensional ◽  
Seismic Source ◽  
Industrial Area ◽  
Structural Features ◽  
Maximum Energy ◽  
Seismic Events ◽  
Ruhr District

<p>The Ruhr district meets the necessary elements to carry out geothermal projects due to its geothermal potential and demand, as it is a densely populated industrial area. Currently, there are projects for direct use, whereas projects for electricity generation are planned. The latter, due to greater depths, reservoir enhancement techniques are required in some cases. This may increase the associated seismic risk which should be elaborated in detail.</p><p>With available data, a three-dimensional geological and structural model was created. The shallower parts have been widely studied and documented by mining activity in the Ruhr region during the last century.  Below a depth of 1 km, data are scarce, and uncertainties increase. The full elastic wavefield emitted by a realistic seismic source has been simulated using a finite differences scheme and the derived geological model. The elastic properties were estimated with well data. The source has common characteristics of real seismic events in the area.</p><p>The wave propagation simulations let us analyze the seismic response with different sources and velocities models. Three cases are considered, two seismic events with distinct depths based on real events. The third case is based on the proposed location of a deep geothermal project.</p><p>Especially for the case with the deeper source, the areas with relatively high amplitudes of displacement correlated with structural features of the model. Applying the imaging condition of maximum energy density allows us to define zones with a potentially increased seismic risk that should be monitored more closely.</p>

scholarly journals An updated and unified earthquake catalog from 1787 to 2018 for seismic hazard assessment studies in Mexico

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Rashad Sawires ◽  
Miguel A. Santoyo ◽  
José A. Peláez ◽  
Raúl Daniel Corona Fernández
Keyword(s):  
Seismic Hazard ◽  
Hazard Assessment ◽  
Seismic Hazard Assessment ◽  
Large Earthquake ◽  
Seismic Source ◽  
Earthquake Catalog ◽  
Magnitude Conversion ◽  
Seismic Source Models ◽  
Source Models ◽  
Definition Of

Abstract Here we present a new updated and unified Poissonian earthquake catalog for Mexico. The details about the catalog compilation, the removal of duplicate events, unifying the magnitude scales, removal of dependent events through the declustering process and its completeness analysis are presented. Earthquake and focal mechanism data have been compiled from various local, regional and international sources. Large earthquake events (MW ≥ 6.5) have been carefully revised for their epicentral locations and magnitudes from trusted publications. Different magnitude-conversion relationships, compatible with available local and regional ones, has been established to obtain unified moment magnitude estimates for the whole catalog. Completeness periods for the declustered catalog were estimated for the definition of appropriate seismic source models for the whole territory. The final unified Poissonian earthquake catalog spans from 1787 to 2018, covering a spatial extent of 13° to 33°N and 91° to 117°W. This catalog is compatible with other published catalogs providing basis for new analysis related to seismicity, seismotectonics and seismic hazard assessment in Mexico.

Optical (Camera-Based) Technology for Seismic Risk Assessment

2003 ◽  
Author(s):  
Thomas Wischgoll ◽  
Tara C. Hutchinson ◽  
Falko Kuester
Keyword(s):  
Risk Assessment ◽  
Seismic Risk ◽  
New Technologies ◽  
Early Warning Systems ◽  
Field Application ◽  
Data Transport ◽  
Seismic Risk Assessment ◽  
Shake Table Tests ◽  
Global Movements ◽  
Definition Of

Due to an increasing bandwidth for data transport in recent computers, optical (camera-based) sensors with high frame rates and reasonable resolutions can nowadays be used with off-the-shelf computers. By monitoring buildings, bridges and other infrastructure with such sensors, they can greatly assist in risk assessment. In this paper, several field application examples are described, largely encompassing the areas of civil infrastructure monitoring. Optical (camera-based) systems can be particularly powerful for monitoring both local and global movements within a scene or environment. Therefore, natural hazards induced by such movements, for example during earthquake events, are an important application area for these new technologies. First, a clear definition of seismic risk assessment is provided. Subsequently, two important fields where cameras may be useful in seismic risk assessment are described. Specifically, the context of (i) early warning systems and (ii) post-earthquake assessment are addressed. An example of using the optical record from a series of large shake table tests is provided and comparison with other methods discussed.

scholarly journals Substantiation model calculation diagram UES of Russia to take balance reliability

2019 ◽  
Vol 139 ◽  
pp. 01047
Author(s):  
Mikhail Chukreyev
Keyword(s):  
Model Calculation ◽  
Energy Systems ◽  
Model Design ◽  
Source Information ◽  
Design Scheme ◽  
Topology Information ◽  
Definition Of ◽  
Electrical Connections

The principles formation the model design scheme UES of Russia are considered to justify the balance reliability in relation to modern conditions of infrastructure changes and intellectualization of energy systems. The definition of territorial zones equal reliability UES of Russia is based on topology information of electrical connections in the UES of Russia and a list of controlled sections in it. Studies on the possible aggregation the model design scheme for spectrum of source information available to researchers are presented.

scholarly journals Back Analysis of Short-Term Seismic Hazard Indicators of Larger Seismic Events in Deep Underground Mines (LKAB, Kiirunavaara Mine, Sweden)

2019 ◽  
Vol 177 (2) ◽  
pp. 763-785
Author(s):  
Emilia Nordström ◽  
Savka Dineva ◽  
Erling Nordlund
Keyword(s):  
Seismic Hazard ◽  
Early Warning ◽  
Back Analysis ◽  
Warning System ◽  
Source Area ◽  
Seismic Source ◽  
Underground Mines ◽  
Seismic Events ◽  
Short Term ◽  
Deep Underground

Abstract Back analysis for evaluation of the merits of the short-term seismic hazard indicators (precursors) used in the mines and their potential application for early warning was carried out for fourteen seismic events that potentially caused damage in Kiirunavaara Mine, Sweden, selected according to our designed criteria. Five short-term hazard indicators: Seismic Activity Rate (SAR), Cumulative Seismic Moment (CSM), Energy Index (EI), Cumulative Apparent Volume (CAV) and Seismic Apparent Stress Frequency (ASF) were tested. The behaviour of the indicators was studied using the parameters of all seismic events within a sphere around the hypocenter location of the analyzed seismic source within one month before the main (damaging) event. The size of the sphere equals the estimated radius of the analyzed seismic source (area of inelastic deformation). mXrap software (Australian Centre for Geomechanics) was used for data visualization, manipulation, analysis and extraction. The results from the main analysis showed a good agreement between the expected and actual behaviour of the SAR, CSM and CAV indicators. In overall, CSM and CAV ranked the highest positive/expected behaviour followed by SAR (Table 3). The EI and ASF ranked lowest and showed to be sensitive to the number of events within the source sphere. The rate of false warnings and missed warnings was also investigated for the 25 days-long period before the damaging events. A similar trend was observed as for the main analysed event. The results from this study can be used for further improvement of the short-term hazard estimations and early warning system in deep underground mines.

Development of Semi-Real-Time Tsunami Monitoring and Calculation System on Ocean-Bottom Stations off the Kii Peninsula, Southwest Japan

2016 ◽  
Vol 50 (3) ◽  
pp. 76-86
Author(s):  
Takeshi Nakamura ◽  
Toshitaka Baba
Keyword(s):  
Real Time ◽  
Pressure Gauge ◽  
Seismic Source ◽  
Ocean Bottom ◽  
Source Information ◽  
Southwest Japan ◽  
Tsunami Propagation ◽  
Waveform Data ◽  
Kii Peninsula ◽  
Calculation Results

AbstractWe developed a semi-real-time calculation and data monitoring system that measures pressure perturbations at ocean-bottom pressure-gauge stations deployed off the Kii peninsula in southwest Japan in order to identify tsunami signals associated with earthquakes. The system automatically calculates geodetic deformations and tsunami propagation immediately after getting seismic source information on hypocenter, magnitude, and mechanism. The calculation results for transoceanic tsunamis can be available in approximately 20 s after getting source information to output waveform data by executing the optimized parallel calculation code on our computer server SGI UV2000 with a 32-core processor unit. The system also provides tide-removed and filtered waveform data at ocean-bottom stations, enabling the calculation results to be compared with actual tsunami arrivals. System operations began in July 2015 and have been applied to tsunamigenic earthquakes in the Pacific Ocean. The system is effective in identifying tsunami signals and automatically predicting tsunami propagation in offshore areas, which may be useful for further data analyses on tsunami propagation.

scholarly journals Updating seismic hazard models for Kuwait

2021 ◽  
Author(s):  
Abd el-aziz Khairy Abd el-aal ◽  
Shaimaa Ismail Mostafa ◽  
Abdullah Al-Enezi ◽  
Farah Al-Jeri ◽  
Ammar Al-Sayegh
Keyword(s):  
Seismic Hazard ◽  
Seismic Risk ◽  
Epistemic Uncertainty ◽  
Probabilistic Approach ◽  
Tall Buildings ◽  
Seismic Source ◽  
Hazard Maps ◽  
Seismicity Pattern ◽  
Uniform Hazard Spectrum ◽  
The State Of Kuwait

Abstract The valuable results from this research are the first and essential step for assessing seismic risk in Kuwait. The increase in the urban development and construction of tall buildings and skyscrapers in Kuwait necessitated an estimate of the seismic risk for creating a unified seismic code for Kuwait. This research comes to make the necessarily step by assessing the seismic hazard and deaggregation in the State of Kuwait. For this purpose, the historical and instrumental seismic catalogs of Kuwait and the active Zagros Seismic Belt were primarily compiled, unifying the magnitudes, removing unnecessary earthquakes (seismicity declustering) and considering the completeness of the catalogs. Multi-seismotectonic models for Kuwait region incorporate earthquake focal mechanisms, seismicity pattern, and structural geological situation have been created to reduce epistemic uncertainty. The recurrence parameters as well as the maximum expected earthquake from each seismic source were fundamentally estimated. Appropriate ground motion attenuation relation within a logic tree formulation was mainly used in creating hazard maps. A state-of-the-art probabilistic approach is used herein to produce hazard maps at return periods of 75, 475, 975 and 2475 years (equivalent to 50%, 10%, 5% and 2%, respectively, probability of exceedance in 50 years) at periods of PGA, 0.1, 1 and 4 seconds. The computations of hazard maps were constructed using spacing grid of 0.2° × 0.2° all over the Kuwait area. Uniform hazard spectrum and deaggregation charts have been adopted for all six governorates of Kuwait. These results with vulnerability index are the main components for estimating the seismic risk of Kuwait.

scholarly journals Secret of radiation protection and anti-static clothing

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Junxiu Zhang ◽  
Haiyang Tang ◽  
Shiguo Chen
Keyword(s):  
Electromagnetic Radiation ◽  
Radiation Protection ◽  
Static Electricity ◽  
Basic Principles ◽  
Daily Lives ◽  
Specific Analysis ◽  
Wide Range ◽  
Working Principle ◽  
Definition Of ◽  
The Impact

In the current era, electromagnetic radiation is everywhere. Every day electromagnetic radiation and static electricity caused by a variety of hazards. So, anti-electromagnetic radiation and anti-static awareness gradually enjoys popular support, more attention are gained by people on the anti-electromagnetic radiation and anti-static. This caused radiation protection and anti-static clothing industry’s rise by the day. Radiation protection and anti-static clothing will enter various households to provide a certain amount of protection to the people's health. We discuss two parts in this paper, specifically from the effects of the electromagnetic radiation and electrostatic effects which started on radiation clothing and anti-static clothing. The main contents of this paper are as follows: The first part of the definition of electromagnetic radiation and its brief introduction, while explaining the types of electromagnetic radiation and electromagnetic radiation sources in daily lives, followed by the emphasis of serious harms on electromagnetic radiation on human health It is precisely because of electromagnetic radiation on people's lives have serious threat, that makes the development of radiation protection. This follows the basic introduction of the radiation suit and the development of radiation protection clothings. The development of radiation protection suits is an established industry. Materials made of radiation protection are constantly changing, but their basic working principle has not changed. Followed by the introduction of the basic principles of radiation protection clothings, we theoretically present specific analysis and demonstration. However, the theoretical analysis and practice is often consists a certain gap, so we highlight a few actual situations on the impact of radiation protection clothings. Finally, we present a simple discussion on wide range of applications of radiation protection clothings. The thought process of second part is similar as the first part, respectively, we introduce the health hazards and the impact on people's lives of electrostatic effect and static electricity . Followed by that it is the basic principles, relevant analysis and discussion of anti-static clothing Finally, we provide the detailed explanation of the application of anti-static clothing.

scholarly journals Culture of legal techniques: key dominants in the modern Russian legal system

2022 ◽  
Vol 39 (71) ◽  
pp. 566-578
Author(s):  
Marina V. Baranova ◽  
Olga B. Kuptsova ◽  
Sergey N. Belyasov ◽  
Arturas S. Valentonis
Keyword(s):  
Legal System ◽  
Modern Society ◽  
Legal Culture ◽  
Effective Functioning ◽  
Formation Stage ◽  
Specific Analysis ◽  
The Law ◽  
Systematic Understanding ◽  
Definition Of ◽  
Modern Russian

The article is dedicated to the conceptual and specific analysis of the emergence of the culture of legal techniques under the conditions of a new technological form. The identification and analysis of key types of culture of legal techniques, allows to show their specificity following typological groups. Its systemic unity, which has its specificities, can be considered as the second dominant of the culture of legal techniques. The article further offers a primary doctrinal definition of the concept of culture of legal techniques based on the identified dominant characteristics and manifestations of the culture of legal techniques, studied in the context of the search for ways of effective functioning of the system of power and powerless principles in the Russian legal system. This phenomenon is in the formation stage. The authors have used dialectical, historical-political, formal-legal, and comparative-legal methods. It is concluded that a promising systematic understanding of the essence and meaning of the culture of legal techniques will help to improve the legal culture as a whole and thus increase the effectiveness of the law in modern society.

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