The synthetic spectra of potential earthquakes for Taipei basin

2020 ◽  
Author(s):  
Ming-Wey Huang ◽  
Chi-Ling Chang ◽  
Sheu-Yien Liu
Keyword(s):  
Goodness Of Fit ◽  
Source Term ◽  
Horizontal Shear ◽  
Taipei Basin ◽  
Amplitude Spectra ◽  
Specific Parameter ◽  
Class B ◽  
Site Term ◽  
Central Taiwan ◽  
Residual Errors

<p>Modeling the amplitude spectra based on the source term, the path one and site ones for 54 sites located in and around the Taipei basin is the aim of this study. The site term includes the amplification function varied with frequency and the site-specific parameter (k0). The amplification functions for Class-C, -D, and -E site are from Huang et al. (2007) for the central Taiwan. Meanwhile, the amplification function for Class-B site can be referred to Boore and Joyner (1997). The root-mean-squared spectral amplitudes of two horizontal shear waves after three-point smoothing from the observed seismograms are compared to the synthetic amplitude spectra. The goodness of fit coefficient (GFC) and the residual errors (ERR) are calculated for concluding the fitness of the modeling amplitude spectra. Results show both the GFC and ERR of stations are varied with the earthquake magnitude and hypo-central distance. The averaged GFC are larger than 0.8 for 42 stations. Meanwhile, there are 12 station with averaged GFC smaller than 0.8. Besides, the ERRs of 28 stations are less than 0.5. Meanwhile, there are 18 stations with ERRs in the range of 0.5-0.6. The obtained results may be used for modeling the amplitude spectra for the Taipei area. The more accurate amplitude spectra can be improved by updating the parameters utilized in the source-, the path- and the site terms.</p>

Source mechanisms for Wilmington Oil Field, California, subsidence earthquakes

1974 ◽  
Vol 64 (3-1) ◽  
pp. 699-711 ◽  
Author(s):  
Robert L. Kovach
Keyword(s):  
Strain Energy ◽  
Focal Depth ◽  
Seismic Source ◽  
Oil Field ◽  
Shear Stresses ◽  
Horizontal Shear ◽  
Amplitude Spectra ◽  
Source Mechanisms ◽  
Stress Drops ◽  
Good Agreement

abstract An unusual set of man-made “earthquakes” was generated in the Wilmington Oil Field, California, during the exploitation of this field. The Wilmington Oil Field was the classic example of an elliptically shaped subsidence bowl produced by the extensive withdrawal of the underlying oil. This surface subsidence produced horizontal shear stresses relieved several times by damaging sudden horizontal movements on very shallow slippage planes. Damaging shocks occurred in 1947, 1949, 1951, 1954, 1955, and 1961. These shocks produced seismograms, primarily composed of surface waves, which present an interesting opportunity to study seismic source mechanisms inasmuch as the focal depth, amount of slip, and source dimensions are known. Rayleigh-wave amplitude spectra for these events reveal seismic moments ranging from 5 × 1022 to 1.7 × 1023 dyne-cm, in good agreement with moments inferred from field observations. A key feature of the subsidence shocks is that very low rupture velocities (0.1 to 0.3 km/sec) were involved. The inferred stress drops indicate that the subsidence shocks must have involved a significant fraction of the available strain energy.

Evaluation of Generalized Site Response Functions for Typical Soil Classes (B, C, and D) in Taiwan

2004 ◽  
Vol 20 (4) ◽  
pp. 1279-1316 ◽  
Author(s):  
Vladimir Yu Sokolov ◽  
C-H. Loh ◽  
K-L. Wen
Keyword(s):  
Site Response ◽  
Soft Rock ◽  
Site Amplification ◽  
Soil Class ◽  
Class D ◽  
Spectral Models ◽  
Amplitude Spectra ◽  
Class B ◽  
Large Earthquakes ◽  
Stiff Soil

Empirical amplification functions for site classes B, C, and D in Taiwan were evaluated as the ratio between Fourier amplitude spectra of recorded accelerograms and spectra modeled for a hypothetical very hard rock (VHR) site. The approach allowed testing applicability of various spectral models in the studied region. More than 1,000 acceleration records obtained during 21 intermediate-sized and large earthquakes (ML>5.5), including the ML 7.3 (MW 7.6) Chi-Chi earthquake (21 September 1999) and the large aftershocks (ML 6.8), were used. The evaluated amplification functions were compared with independent data, which were obtained recently for Taiwan, the western United States, and Greece. The prominent influence of geologic and geomorphologic factors on site amplification functions for the considered cases of rock (Class B), soft rock or very dense soil (Class C), and stiff soil (Class D) sites has been observed for the Taiwan region.

scholarly journals Reversing hydrology: quantifying the temporal aggregation effect of catchment rainfall estimation using sub-hourly data

2015 ◽  
Vol 47 (3) ◽  
pp. 630-645 ◽  
Author(s):  
A. Kretzschmar ◽  
W. Tych ◽  
N. A. Chappell ◽  
K. J. Beven
Keyword(s):  
Goodness Of Fit ◽  
Rainfall Regime ◽  
Effective Rainfall ◽  
Inversion Process ◽  
Aggregation Effect ◽  
Hourly Data ◽  
Frequency Domains ◽  
Amplitude Spectra ◽  
Novel Method ◽  
The Time Domain

Inferred rainfall sequences generated by a novel method of inverting a continuous time transfer function show a smoothed profile when compared to the observed rainfall, however, streamflow generated using the inferred catchment rainfall is almost identical to observed streamflow (Rt2 > 97%). This paper compares the effective rainfall inferred by the regularised inversion process (termed inferred effective rainfall (IER)) proposed by the authors with effective rainfall derived from the observed catchment rainfall (termed observed effective rainfall (OER)) in both time and frequency domains in order to confirm that, by using the dominant catchment dynamics in the inversion process, the main characteristics of catchment rainfall are being captured by the IER estimates. Estimates of the resolution of the IER are found in the time domain by comparison with aggregated sequences of OER, and in the frequency domain by comparing the amplitude spectra of observed and IER. The temporal resolution of the rainfall estimates is affected by the slow time constant of the catchment, reflecting the presence of slow hydrological pathways, for example, aquifers, and by the rainfall regime, for example, dominance of convective or frontal rainfall. It is also affected by the goodness-of-fit of the original forward rainfall–streamflow model.

Applying the Anderson-Darling Test to Suicide Clusters

Crisis ◽  
2013 ◽  
Vol 34 (6) ◽  
pp. 434-437 ◽  
Author(s):  
Donald W. MacKenzie
Keyword(s):  
Poisson Process ◽  
Goodness Of Fit ◽  
Small Samples ◽  
Massachusetts Institute Of Technology ◽  
Homogeneous Poisson Process ◽  
Cornell University ◽  
The Difference ◽  
Suicide Clusters ◽  
Institute Of Technology ◽  
Anderson Darling

Background: Suicide clusters at Cornell University and the Massachusetts Institute of Technology (MIT) prompted popular and expert speculation of suicide contagion. However, some clustering is to be expected in any random process. Aim: This work tested whether suicide clusters at these two universities differed significantly from those expected under a homogeneous Poisson process, in which suicides occur randomly and independently of one another. Method: Suicide dates were collected for MIT and Cornell for 1990–2012. The Anderson-Darling statistic was used to test the goodness-of-fit of the intervals between suicides to distribution expected under the Poisson process. Results: Suicides at MIT were consistent with the homogeneous Poisson process, while those at Cornell showed clustering inconsistent with such a process (p = .05). Conclusions: The Anderson-Darling test provides a statistically powerful means to identify suicide clustering in small samples. Practitioners can use this method to test for clustering in relevant communities. The difference in clustering behavior between the two institutions suggests that more institutions should be studied to determine the prevalence of suicide clustering in universities and its causes.

Confirmatory Factor Analysis of the Long and Short Forms of the Worry Domains Questionnaire

2009 ◽  
Vol 25 (4) ◽  
pp. 239-243
Author(s):  
Roberto Nuevo ◽  
Andrés Losada ◽  
María Márquez-González ◽  
Cecilia Peñacoba
Keyword(s):  
Factor Analysis ◽  
Confirmatory Factor Analysis ◽  
Factor Structure ◽  
Goodness Of Fit ◽  
Factorial Validity ◽  
Fit Indices ◽  
Short Forms ◽  
Confirmatory Factor ◽  
Positive Correlations ◽  
Future Work

The Worry Domains Questionnaire was proposed as a measure of both pathological and nonpathological worry, and assesses the frequency of worrying about five different domains: relationships, lack of confidence, aimless future, work, and financial. The present study analyzed the factor structure of the long and short forms of the WDQ (WDQ and WDQ-SF, respectively) through confirmatory factor analysis in a sample of 262 students (M age = 21.8; SD = 2.6; 86.3% females). While the goodness-of-fit indices did not provide support for the WDQ, good fit indices were found for the WDQ-SF. Furthermore, no source of misspecification was identified, thus, supporting the factorial validity of the WDQ-SF scale. Significant positive correlations between the WDQ-SF and its subscales with worry (PSWQ), anxiety (STAI-T), and depression (BDI) were found. The internal consistency was good for the total scale and for the subscales. This work provides support for the use of the WDQ-SF, and potential uses for research and clinical purposes are discussed.

Finding Goodness of Fit When You are Black, Poor, Male, and Disturbed

1988 ◽  
Vol 33 (10) ◽  
pp. 885-886
Author(s):  
Judith K. Grosenick
Keyword(s):  
Goodness Of Fit ◽  
Black Poor

Study of the process of forming a hole for a thread at manufacturing a high nut

2020 ◽  
Vol 76 (8) ◽  
pp. 841-846
Author(s):  
I. G. Shubin ◽  
A. A. Kurkin
Keyword(s):  
Metal Flow ◽  
Nonlinear Dependence ◽  
Geometrical Parameters ◽  
Relative Height ◽  
Forming Process ◽  
Normal Height ◽  
Accuracy Class ◽  
Limit Values ◽  
Program Complex ◽  
Class B

During manufacturing nuts of increased height, a problem of obtaining correct cylindrical form of the hole for thread and overall geometrical parameters arises. To solve the problem it is necessary to know regularity of the blank forming process. Results of the study of a technological process of high hexahedral nuts forming presented. The nuts were M18 of 22 mm height, M16 of 19 mm height and M12 of normal height 10 mm according to GOST 5915–70, accuracy class B, steel grade 10 according to GOST 10702–78. The volumetric stamping was accomplished at the five-position automatic presses of АА1822 type. It was determined, that unevenness of the metal flow in the process of plastic deformation of blanks of increased height nuts was caused by different stress conditions by their sections. To simulate the mode of deformation, the program complex QForm-3D was chosen. The complex ensured to forecast with necessary accuracy the metal flow in a blank, as well as to define the deformation force and arising stress in the working instrument. The simulation showed the presence of regularity between preliminary formed buffle and deviation of dimensions and form of a blank wall after its finishing piercing, which can be expressed by a nonlinear dependence. The limit values of the relative height of the buffle С/D = 0.56–0.588 defined, exceeding which will result in rejection of the finished product. Accounting the limit values of the relative height of the buffle will enable to correct a mode of technological operations and technological instruments at stamping of high hexahedral nuts.

Pengelolaan Limbah B3 Di Rumah Sakit X Kota Batam

2019 ◽  
Vol 5 (1) ◽  
Author(s):  
Salma Savira Siddik ◽  
Eka Wardhani
Keyword(s):  
Health Service ◽  
Solid Waste ◽  
Medical Management ◽  
Secondary Data ◽  
Toxic Waste ◽  
Waste Collection ◽  
Private Hospitals ◽  
Collection Method ◽  
Technical Requirements ◽  
Class B

<p>Hospital X was class b private hospitals that are located in Batam with 297 unit beds. The waste that can be categorized as solid waste medical in the hospital which is infectious, pharmacy, hazardous and toxic waste, cytotoxic, sharp object.  The purpose of this research is to identify, a source of , the characteristics, solid waste medical produced by hospital X in Batam and also conduct an evaluation of solid waste medical management hospital in accordance with the minister of environment and forestry 56 2015 on procedures and technical requirements of hazardous and toxic waste management than health service facilities. This research used primary and secondary data collection method. The research results show solid waste medical management at the hospital X in Batam most of them are in according to rule. But there are some things that must be improved are blinding trash bag, efficiency and minimal temparature the combustion chamber incinerator. Management efforts must to do are briefing to officer of the waste collection about the way to blinding trash bag in according to the regulation and the incinerator that can serve confirming to standard of burning hazardous and toxic waste. <strong></strong></p>

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