scholarly journals DETERMINATION OF EARTHQUAKE FOCUS COORDINATES USING THE CASSINI OVAL METHOD WITH SECOND- AND FOURTH-ORDER HYPERBOLA FIGURES

2020 ◽  
Vol 46 (4) ◽  
pp. 134-142
Author(s):  
B. I. Shakhtarin ◽  
T. G. Aslanov ◽  
U. R. Tetakaev
Keyword(s):  
Comparative Analysis ◽  
Fourth Order ◽  
Relative Position ◽  
Seismic Waves ◽  
Arrival Times ◽  
Earthquake Focus ◽  
Seismic Sensors ◽  
Calculation Results ◽  
The Difference

Objectives. To study the dependencies obtained when determining the coordinates of an earthquake hypocentre using the figures of fourth and second orders.Method. A comparative analysis of determining the coordinates of the earthquake focus using the Cassini oval method, both taking errors in the readings of seismic sensors into account the and ignoring them, is presented.Result. A new method is proposed for determining the coordinates of the earthquake hypocentre, which uses the fourth-order figure, the Cassini oval, in the calculations. A graph is obtained for the distribution of errors in determining the coordinates of the earthquake focus (using the Cassini oval) depending on the relative position of two seismic sensors with different values of their errors in determining the difference in travel times of seismic waves.Conclusion. Since the calculation results are independent of the error sign in determining the difference in the arrival times of seismic waves, the method is suitable for the initial determination of the coordinates of the earthquake hypocentre as well as for comparison with the results of other methods for identifying the error sign. 

Seismic analysis of the 7 January 1998 Chemical plant explosion at Kean Canyon, Nevada

1999 ◽  
Vol 89 (4) ◽  
pp. 938-945 ◽  
Author(s):  
Gene A. Ichinose ◽  
Kenneth D. Smith ◽  
John G. Anderson
Keyword(s):  
Seismic Analysis ◽  
Correlation Method ◽  
Chemical Safety ◽  
P Waves ◽  
Arrival Times ◽  
Chemical Company ◽  
Optimal Separation ◽  
The Difference ◽  
Possible Cause

Abstract An accident at the Sierra Chemical Company Kean Canyon plant, 16 km east of Reno, Nevada, resulted in two explosions 3.52 sec apart that devastated the facility. An investigation into a possible cause for the accident required the determination of the chronological order of the explosions. We resolved the high-precision relative locations and chronology of the explosions using a cross-correlation method applied to both seismic and air waves. The difference in relative arrival times of air waves between the explosions indicated that the first explosion occurred at the northern site. We then determined two station centroid separations between explosions, which average about 73 m with uncertainties ranging from ± 17 to 41 m depending on the alignment of station pairs. We estimated a centroid separation of 80 m using P waves with a larger uncertainty of ± 340 m. We performed a grid search for an optimal separation and the azimuth by combining air-wave arrivals from three station pairs. The best solution for the relative location of the second explosion is 73.2 m S35°E from the first explosion. This estimate is well within the uncertainties of the survey by the U.S. Chemical Safety and Hazard Investigation Board (CSB). The CSB reported a separation of approximately 76.2 m S33°E. The spectral amplitudes of P waves are 3 to 4 times higher for the second explosion relative to the first explosion, but the air waves have similar spectral amplitudes. We suggest that this difference is due to the partitioning of energy between the ground and air caused by downward directivity at the southern explosion, and upward directivity at the northern explosion. This is consistent with the absence of a crater for the first explosion and a 1.8-m-deep crater for the second explosion.

scholarly journals Observation of the long-period monotonic seismic waves of the November 11, 2018, Mayotte event by Iranian broadband seismic stations

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Hossein Sadeghi ◽  
Sadaomi Suzuki
Keyword(s):  
Surface Waves ◽  
Seismic Waves ◽  
Maximum Amplitude ◽  
Body Waves ◽  
Dipole Source ◽  
Arrival Times ◽  
Unusual Event ◽  
Long Period ◽  
Clear Peak ◽  
The Difference

AbstractOn November 11, 2018, an event generating long-lasting, monotonic long-period surface waves was observed by seismographs around the world. This event occurred at around 09:28 UTC east of the Mayotte Island, in the Indian Ocean off the coast of East Africa. This event is unusual due to the absence of body waves in the seismograms and no feeling of earth shaking by people locally. The purpose of this study is to investigate this unusual event using the waveforms recorded by 26 stations of the Iranian National Broadband Seismic Network. The stations are located at epicentral distances ranging from 4542 to 5772 km north-northeast of the event’s epicenter. The arrival of monochromatic long-period signals is visible around 10 UTC in the recordings of all the stations and the signals lasted for more than 30 min. Frequency analysis of the seismograms shows a clear peak at 0.064 Hz (15.6 s/cycle). The maximum amplitude of the transverse components is less than a half of the radial components. This is in agreement with the theoretical radiation pattern of Rayleigh and Love waves at a frequency of 0.06 Hz for a vertical compensated linear vector dipole source mechanism. The average apparent phase velocities were calculated as 3.31 and 2.97 km/s, in the transverse and radial directions, corresponding, respectively, to Love and Rayleigh waves in the frequency range of 0.05–0.07 Hz. A surface wave magnitude of Ms 5.07 ± 0.22 was estimated. Just before the monochromatic signal arrives, there is some dispersion in the surface waves. This observation may suggest a regular earthquake of Ms 4.3 ± 0.11 that triggered the November 11, 2018, event. The difference between the arrival times of the recorded surface waves of the two events is estimated to be less than 31 s, and most likely of ~ 7 s only.

scholarly journals Determination of coordinates of the earthquake hypocenter by the method of circles

2021 ◽  
Vol 48 (3) ◽  
pp. 52-58
Author(s):  
G. K. Aslanov ◽  
T. G. Aslanov
Keyword(s):  
Fourth Order ◽  
Intersection Point ◽  
Earthquake Source ◽  
Seismic Sensors ◽  
Earthquake Hypocenter ◽  
Source Data ◽  
Different Shapes ◽  
Intersection Line ◽  
Using Data

Objective. The aim of the study is to develop a method for determining the coordinates of the earthquake hypocenter using various combinations of second and fourth order figures as a geo-locus of the hypocenter position points.Method. It is known that the line of intersection of figures of the second and fourth orders, in the case of coincidence of focuses, is a circle. To determine the coordinates of the earthquake source, data from seismographs are used, which are used to construct figures of the second and fourth order, the intersection point of which is the hypocenter. When using data from two seismic sensors, there are two figures, the intersection line of which is a circle. A sphere with a radius equal to the radius of the circle is constructed through the center of this circle. For the other two pairs of seismic sensors, two more spheres are also formed, The intersection point of the three spheres obtained is the sought-for hypocenter of the earthquake.Result. A method has been developed for determining the coordinates of an earthquake source using different shapes of the second and fourth orders for different pairs of seismic sensors.Conclusion. The method allows one to select one of the second or fourth order figures for different pairs of seismic sensors, which makes it possible to reduce the error in determining the source coordinates.

scholarly journals Nonlinear Closure Relations for Electron Transport in Hydrodynamical Models

2013 ◽  
Vol 2013 ◽  
pp. 1-13
Author(s):  
A. Salhoumi
Keyword(s):  
Distribution Function ◽  
Fourth Order ◽  
Lagrange Multipliers ◽  
Hermite Polynomials ◽  
Boltzmann Distribution ◽  
Hydrodynamical Models ◽  
Calculation Results ◽  
Closure Relations ◽  
Theory Calculation

Closure relations problem of hydrodynamical models in semiconductors is considered by expressing third- and fourth-order closure relations for the moments of the distribution function in terms of second-order Lagrange multipliers using a generalized Maxwell-Boltzmann distribution function within information theory. Calculation results are commented and compared with others to justify the accuracy of the approach developed in this paper. The comparison involves, in the first part with good agreements, the closure relations results obtained within extended thermodynamics which were checked by means of Monte Carlo simulations, in the second part, the results obtained by Grad's method which expands the distribution function up to fourth-order in Hermite polynomials. It is seen that the latter method cannot give any restriction on closure relations for higher-order moments, within the same conditions proposed in our approach. The important role of Lagrange multipliers for the determination of all closure relations is asserted.

Analysis of Continuous Girder Bridge Based on Different Codes

2013 ◽  
Vol 361-363 ◽  
pp. 1311-1314
Author(s):  
Meng Ying Liu ◽  
Bang Zhe Liu
Keyword(s):  
Finite Element ◽  
Comparative Analysis ◽  
Girder Bridges ◽  
Calculation Results ◽  
Continuous Girder Bridge ◽  
The Difference ◽  
Girder Bridge

As the object to continuous girder bridges of movable formwork construction,for the same real bridge according to the new code and old code respectively establish finite element mode and for the corresponding calculation and checked, through the comparative analysis about construct materials, calculation conditions and the calculation results, etc,to discuss the difference of the design results between the new standard and the old standard, in order to accumulated useful experience about designing new bridge and reinforcing and reforming old bridge.

scholarly journals Penentuan Harga Pokok Produksi Dengan Metode Full Costing Sebagai Dasar Penetapan Harga Jual Pada UKM Tahu AN Anugrah

2020 ◽  
Vol 8 (1) ◽  
pp. 9-16
Author(s):  
Sintia Anggreani ◽  
I Gde Sudi Adnyana
Keyword(s):  
Secondary Data ◽  
Production Costs ◽  
Primary Data ◽  
Selling Price ◽  
Accurate Calculation ◽  
Calculation Results ◽  
The Difference ◽  
The Cost ◽  
Keywords Cost

Cost of Goods Manufacture is an important component that must be calculated by the company in order to determine the selling price of the product. SMEs are often wrong in calculating the Cost of Goods Manufacture they do. One of the mistakes made by SMEs in calculating the Cost of Goods Manufacture is that the calculations carried out are very simple and do not specify all costs used in the production process to produce a product. This study aims to analyze (1) the calculation of the Cost of Goods Manufacture in SMEs Tahu AN Anugrah , (2) the determination of Cost of Goods Manufacture with the full costing method in SMEs Tahu AN Anugrah, and (3) the difference in calculation of Cost of Goods Manufacture according to SMEs AN Anugrah and according full costing method and its effect on selling prices.                The data used in this study are primary data and secondary data. The primary data used is obtained from the results of interviews and recording of information needed directly in SMEs Tahu AN Anugrah. While the secondary data are is obtained from literature studies such as previous journals, related books, documentation and reading in accordance with the research title.  The Research results show, there are differences in the calculation results of the Cost of Goods Manufacture carried out by the SMEs and by the full costing method. The calculation of Cost of Goods Manufacture by SMEs Tahu AN Anugrah for White Tofu products is Rp 200 and Yellow Tofu Rp 201.12 while by the full costing method for White Tofu products is Rp 218.41 and Yellow Tofu Rp 228.44. So that, there are differences in the calculation results, namely for White Tofu Rp 18.41 and Yellow Tofu Rp 27.32. Differences in calculation are due to the full costing method is more detailed by including all elements of production costs. This shows that the method provides a more accurate calculation to be able to set a better selling price.  Keywords: Cost of Goods Manufacture, Full Costing, Selling Prices, SMEs

scholarly journals Feature of statistical data processing by computer mathematics systems tools

Radiotekhnika ◽  
2021 ◽  
pp. 131-136
Author(s):  
I. Moshchenko ◽  
O. Nikitenko ◽  
Yu. Kozlov ◽  
Yu. Zharko
Keyword(s):  
Data Processing ◽  
Statistical Data ◽  
Microsoft Excel ◽  
Statistical Data Processing ◽  
Calculation Results ◽  
Error Accumulation ◽  
The Difference ◽  
Mean Variance ◽  
Skewness And Kurtosis

Processes of error accumulation were analysed during arithmetic operations on statistical data obtained in the course of research on oscillations in cross-field electron vacuum devices. The features of statistical data processing obtained as a result of experimental research were investigated using the most widespread computer mathematical packages. The features of statistical data processing were investigated by processing a sample of 80 values of the magnetron generation frequency using popular mathematical packages Excel, Maple, Matlab and MathCad and comparing the results obtained with calculations using theoretical formulas. Calculation results for all packages give the same results for mean, variance and standard deviation. As for the coefficients of skewness and kurtosis, most of the results do not coincide. Analysis of the calculation results showed that the difference in the obtained values ​​of the skewness and kurtosis is due to different definitions of these indicators in mathematical packages Excel, Maple, Matlab and MathCad. It is proved that in Microsoft Excel we cannot correctly construct a histogram without using additional operations, because the interval limits are calculated with errors. It leads to an incorrect determination of the number of elements into these intervals. To build correctly a histogram using the Excel package, it is necessary to calculate the interval limits in advance. It is concluded that before using computer mathematical packages for processing statistical data, it is necessary to analyze first by what formulas the required parameters are calculated and take appropriate measures to eliminate possible discrepancies with the parameters calculated using theoretical formulas.

scholarly journals Calving localization at Helheim Glacier using multiple local seismic stations

2017 ◽  
Vol 11 (1) ◽  
pp. 609-618 ◽  
Author(s):  
M. Jeffrey Mei ◽  
David M. Holland ◽  
Sridhar Anandakrishnan ◽  
Tiantian Zheng
Keyword(s):  
Surface Wave ◽  
Wave Velocity ◽  
Rayleigh Waves ◽  
Seismic Waves ◽  
Grid Search ◽  
Arrival Times ◽  
S Waves ◽  
Surface Wave Velocity ◽  
The Difference ◽  
Wave Arrival

Abstract. A multiple-station technique for localizing glacier calving events is applied to Helheim Glacier in southeastern Greenland. The difference in seismic-wave arrival times between each pairing of four local seismometers is used to generate a locus of possible event origins in the shape of a hyperbola. The intersection of the hyperbolas provides an estimate of the calving location. This method is used as the P and S waves are not distinguishable due to the proximity of the local seismometers to the event and the emergent nature of calving signals. We find that the seismic waves that arrive at the seismometers are dominated by surface (Rayleigh) waves. The surface-wave velocity for Helheim Glacier is estimated using a grid search with 11 calving events identified at Helheim from August 2014 to August 2015. From this, a catalogue of 11 calving locations is generated, showing that calving preferentially happens at the northern end of Helheim Glacier.

scholarly journals Comparative Analysis of Hydrogenotrophic Denitrification in up and down Flow Reactors

2019 ◽  
Vol 15 (2) ◽  
pp. 87-91
Author(s):  
Rabin Maharjan ◽  
Iswar Man Amatya ◽  
Ram Kumar Sharma
Keyword(s):  
Comparative Analysis ◽  
Flow Reactor ◽  
Flow Direction ◽  
Inorganic Nitrogen ◽  
Flow Reactors ◽  
Total Inorganic Nitrogen ◽  
The Difference ◽  
Tin Removal ◽  
Better Than

Use of ground water containing ammonical nitrogen has been increasing in Kathmandu valley. The use of locally and cheaply fitted Hydrogenotrophic Denitrification (HD) has been taken as an effective way to remove the nitrates in this study. Comparative analysis of HD reactors had been studied for the determination of the effective flow direction of water as Up Flow or Down Flow. The result reviled that flow direction as Down Flow HD reactor performed slightly better than Up Flow HD reactor. The maximum NO3-N conversion reached 100% for Down Flow and 98.65% for Up Flow reactor with maximum of total inorganic nitrogen (TIN) removed were 41.11% and 33.89% for Down Flow and Up Flow reactor respectively. The difference in NO3-N conversion and TIN removal were observed. As the NO2-N was accumulated, suggesting NO3 conversion is higher than NO2 conversion thus, and majorly incomplete denitrification existed. The NO2-N in water reached to maximum of 78.89 mg/l and 72.55 mg/l for Down Flow and Up Flow rector.

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