scholarly journals Certain and potential earthquake-induced landslides in Vrancea seismic region

2017 ◽  
Author(s):  
Mihai Micu ◽  
Hans-Balder Havenith ◽  
Dan Bălteanu ◽  
Alexandru Onaca ◽  
Anne-Sophie Mreyen ◽  
...  
Keyword(s):  
Seismic Region ◽  
Vrancea Seismic Region

scholarly journals The stress field of Vrancea region from fault plane solution (FPS)

2011 ◽  
Vol 11 (10) ◽  
pp. 2817-2820 ◽  
Author(s):  
L. Telesca ◽  
V. Alcaz ◽  
I. Sandu
Keyword(s):  
Stress Field ◽  
Fault Plane ◽  
Moment Tensor ◽  
Field Investigation ◽  
Seismic Region ◽  
Fault Plane Solutions ◽  
Intermediate Depth ◽  
Vrancea Region ◽  
Plane Solution ◽  
Vrancea Seismic Region

Abstract. The fault plane solutions (FPS) of 247 seismic events were used for stress field investigation of the region. The eigenvectors t, p, b, and moment tensor M components for each FPS were defined and computed numerically. The obtained results confirm the hypothesis of subduction-type intermediate depth earthquakes for the Vrancea seismic region and this may be considered the first approximation of the stress field for the whole of the Vrancea (intermediate depth) region.

A statistical study on artificially generated earthquake records

1976 ◽  
Vol 3 (1) ◽  
pp. 11-19
Author(s):  
W. K. Tso ◽  
B. P. Guru
Keyword(s):  
Statistical Study ◽  
Spectral Response ◽  
Flexible Structures ◽  
Time History ◽  
Maximum Response ◽  
Response Analysis ◽  
Seismic Region ◽  
Natural Period ◽  
Earthquake Records ◽  
Time History Response

A statistical study has been done to investigate (i) the variation of spectral responses of structures due to artificially generated earthquake records with identical statistical properties, (ii) the effect of duration of strong shaking phase of artificial earthquakes on the response of structures, and (iii) the number of earthquake records needed for time-history response analysis of a structure in a seismic region. The results indicate that the flexible structures are more sensitive to the inherent statistical variations among statistically identical earthquake records. Consequently several records must be used for time-history response analysis. A sample of eight or more records appear to provide a good estimate of mean maximum response. The duration of strong shaking can significantly affect the maximum response. Based on the results, it is suggested that for the purpose of estimating peak response, the strong shaking duration of the input earthquake motion should be at least four times the natural period of the structure. The maximum responses due to statistically identical ground motion records are observed to fit approximately the type 1 extreme value distribution. Thus, it is rationally possible to choose a design value based on the mean, standard deviation of the spectral response values and tolerable probability of exceedance.

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