| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
Article |
Institute of Engineering Seismology & Earthquake Engineering (ITSAK)
46 Georgikis Scholis Str., P.O. Box 53
GR 551 02 Finikas, Thessaloniki, Greece
margaris{at}itsak.gr
(B.N.M)
Geophysical Laboratory, School of Geology
Aristotle University of Thessaloniki
GR 54000, Greece
takis{at}lemnos.geo.auth.gr
(P.M.H)
Manuscript received 27 February 2001.
A data set of 50 horizontal strong-motion accelerograms from 18 main events from moderate and large earthquakes (5.2 
Mw 6.9) and distances (9 km R 116 km) occurred at three different tectonic settings (normal, strike-slip, and thrust faulting), were used to estimate stress parameters. Three different definitions of stress release were adopted: the classical Brune, the dynamic-rms (root mean square), and the apparent stress. Corner frequencies, f0, based on the Andrews (1986) methodology were computed and, using these calculations, seismic moments were estimated from independent sources (teleseismic data). The calculated corner frequencies seem to be consistent, based on seismic moments, with previous estimates for the same area. Based on those source parameters, a theoretical 
-square spectrum was derived from describing source radiation in terms of earthquake size. Frequency-dependent site amplifications were included in the simulations, separating the recordings in three different categories (B, C, and D) corresponding to (NEHRP) National Earthquake Hazards Reduction Program site classification. The theoretical and observational spectra are in good agreement, in a frequency range from 0.05 to 25 Hz, except for the cases where steep topography affects the recorded data. A poor fit is also observed in cases where the distance of the recorded data is greater than 100 km and the attenuation model seems to be inadequate to describe the theoretical model. The calculated parameters present a mean value of 55 ± 16 bars for Brune stress, 72 ± 26 bars for dynamic-rms stress, and 17 ± 10 bars for apparent stress. For all determined stresses, the thrust-faulting earthquakes exhibited higher values than the calculated normal-and strike-slip-fault seismic events.
This article has been cited by other articles:
|
|
 |
|
  G. Ameri, F. Pacor, G. Cultrera, and G. Franceschina Deterministic Ground-Motion Scenarios for Engineering Applications: The Case of Thessaloniki, Greece Bulletin of the Seismological Society of America, June 1, 2008; 98(3): 1289 - 1303. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
B. Duan and D. D. Oglesby The Dynamics of Thrust and Normal Faults over Multiple Earthquake Cycles: Effects of Dipping Fault Geometry Bulletin of the Seismological Society of America, October 1, 2005; 95(5): 1623 - 1636. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
V. Sokolov, K.-P. Bonjer, M. Oncescu, and M. Rizescu Hard Rock Spectral Models for Intermediate-Depth Vrancea, Romania, Earthquakes Bulletin of the Seismological Society of America, October 1, 2005; 95(5): 1749 - 1765. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. Jimenez, J. M. Garcia, and M. D. Romacho Simultaneous Inversion of Source Parameters and Attenuation Factor Using Genetic Algorithms Bulletin of the Seismological Society of America, August 1, 2005; 95(4): 1401 - 1411. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
Empirical Peak Ground-Motion Predictive Relations for Shallow Earthquakes in Greece Bulletin of the Seismological Society of America, December 1, 2003; 93(6): 2591 - 2603.
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
