Inelastic displacement demand of RC buildings subjected to earthquakes generated by intermediate-depth Vrancea seismic source

2021 ◽  
Author(s):  
Paul Olteanu ◽  
Radu Vacareanu
Keyword(s):  
Seismic Source ◽  
Rc Buildings ◽  
Intermediate Depth ◽  
Inelastic Displacement ◽  
Vrancea Seismic Source ◽  
Displacement Demand

Estimating the accuracy of source “parameters”

1967 ◽  
Vol 57 (3) ◽  
pp. 373-379 ◽  
Author(s):  
Helen W. Freedman
Keyword(s):  
Standard Error ◽  
Source Parameters ◽  
Seismic Source ◽  
Origin Time ◽  
Intermediate Depth ◽  
Seismic Source Parameters ◽  
Space And Time

abstract This paper suggests a method for estimating the errors accompanying estimates of seismic source parameters. While the method is a general one, the data here are from 1962 and 1963 and special attention is given to a few regions, such as the Kuriles. The overall standard error of about one-half a degree in each coordinate and four seconds in origin time are broken down and analyzed in terms of magnitude, depth, and location in space and time. The most accurately located earthquakes appear to be those of intermediate depth and magnitude in highly seismic areas. There is some indication that these errors are decreasing with time.

Aftershock Activity at Intermediate-Depth Earthquakes in Northern Chile Controlled by Plate Hydration

2020 ◽  
Author(s):  
Leoncio Cabrera ◽  
Sergio Ruiz ◽  
Piero Poli ◽  
Eduardo Contreras-Reyes ◽  
Renzo Mancini ◽  
...  
Keyword(s):  
Template Matching ◽  
Broad Band ◽  
Strong Motion ◽  
Seismic Source ◽  
Northern Chile ◽  
Aftershock Activity ◽  
Study Region ◽  
Abrupt Decrease ◽  
Intermediate Depth ◽  
The Impact

<p>We investigate the differences of the seismic source and aftershock activity using kinematic inversions and template matching respectively, for the six largest intraslab intermediate-depth earthquakes occurred in northern Chile (Mw ~6.3) since 2010 at depths between 90 and 130 km and recorded by dense strong-motion and broad-band seismic networks. In addition, we developed a thermal model using the finite element method in the study region with the aim of analyze the impact of temperature on seismic behavior as the oceanic plate subducts. Our results show that geometries of rupture zones are similar, with semi-axis for an elliptical patch approach about 5 km, and stress drop values between 7 and 30 MPa. On the other hand, the number of aftershocks exhibits clear differences, and their amount decreases with increasing the depth within the slab bounded by the 450 ºC isotherm, which represents a limit between a high-hydrated and a dry or low-hydrated region. Furthermore, mainshocks occur at distances from the top of the slab from 7 to 40 km, and all of them exhibit normal focal mechanisms suggesting that the extensional regimen deepens within the slab to the 700-750 ºC isotherm-depth. We suggest that in northern Chile the abrupt decrease of aftershocks in the lower part of the extensional regimen is caused by the absence of a hydrated slab at those depths.</p>

scholarly journals Inelastic Displacement Ratios for Evaluation of Degrading Peak – Oriented SDOF Systems

2017 ◽  
Vol 62 (1) ◽  
pp. 33-47 ◽  
Author(s):  
Muzaffer Borekci ◽  
Murat S. Kirçil ◽  
Ibrahim Ekiz
Keyword(s):  
Dynamic Instability ◽  
Time History ◽  
Nonlinear Time History Analysis ◽  
Elastic Displacement ◽  
Hysteretic Model ◽  
Collapse Potential ◽  
Inelastic Displacement ◽  
The Mean ◽  
Displacement Demand ◽  
Inelastic Displacement Ratio

Estimation of the inelastic displacement demand (IDD) is an important part of the performance-based design. Coefficient method is one of the methods for the estimation of IDD and in this method, IDD is determined by multiplying elastic displacement demand with inelastic displacement ratio (CR ). Previous researches showed that structures deteriorate and also exhibit dynamic instability under severe earthquakes and these behaviors should be considered in the estimation of CR to estimate a reliable IDD. In this study, CR of the non-degrading bilinear hysteretic model and the degrading peak-oriented hysteretic model with collapse potential were determined and effects of degradation on IDD were investigated. Nonlinear time history analysis of SDOF systems were performed using considered hysteretic models. Furthermore a new equation is proposed for the mean CR of degrading SDOF systems. Also, effect of local site conditions and post-yield stiffness on the mean CR of degrading SDOF systems were investigated.

The intermediate earthquake source near Bucaramanga, Colombia

1970 ◽  
Vol 60 (1) ◽  
pp. 269-276 ◽  
Author(s):  
Eysteinn Tryggvason ◽  
James Edwards Lawson
Keyword(s):  
Point Source ◽  
Seismic Source ◽  
Earthquake Source ◽  
Intermediate Depth ◽  
Intermediate Earthquake ◽  
Large Earthquakes ◽  
Frequency Magnitude

abstract An intensive source of intermediate depth earthquakes has been located in northern Colombia. The activity of this source increased significantly between 1956 and 1966, but appears to be decreasing after 1966. The frequency-magnitude relation of the Bucaramanga earthquakes is anomalous, with fewer large earthquakes than expected. The distribution of determined hypocenters is the same as would be observed if all earthquakes originated in the same point source. Therefore it is concluded that the Bucaramanga seismic source consists of a volume, less than 10 km in radius, centered at 6.8°N, 73.1°W., and 150 km depth.

Macroseismic intensity prediction equations for Vrancea intermediate-depth seismic source

2015 ◽  
Vol 79 (3) ◽  
pp. 2005-2031 ◽  
Author(s):  
Radu Văcăreanu ◽  
Mihail Iancovici ◽  
Cristian Neagu ◽  
Florin Pavel
Keyword(s):  
Seismic Source ◽  
Macroseismic Intensity ◽  
Prediction Equations ◽  
Intermediate Depth ◽  
Intensity Prediction
Sign in / Sign up

Export Citation Format

Share Document