Slip Model
of 8 June 2008 Earthquake

Near the town of Andravida, Southwestern of Patra Greece

  A strong earthquake of magnitude Mw=6.4 occurred in western Greece near Andravida
on 8 June 2008 (12:25 GMT). The focal mechanism solution showed strike slip type faulting.
The ruptured fault is almost vertical and has a SW-NE direction.

The inversion of teleseismic waves showed that the earthquake had directivity to Northeast.
The calculated slip model revealed more than 1 seismic sources. Coulomb stress analysis
based on : (1) a simplified model of slip and (2) on the calculated slip model, revealed the
regions loaded with stress after the earthquake. The values of stress are not the same
between the two models but the regions where the stress is transferred are the same.

                              
Teleseismic modeling Station Map Teleseismic Modeling for slip Slip distribution
Synthetic Shakemap Coulomb Changes Simple model Coulomb Changes using Slip model Magnitude estimation

Source parameters determination using Teleseismic P,SH,SV waves


 

The teleseismic Stations whose data were used in the inversion
and the focal mechanism of the earthquake

 

Teleseismic Modeling of P and SH waves

 

Slip Distribution

 

Synthetic PGV map + relocated seismicity

 

Simple Coulomb Stress transfer model

 

Coulomb Stress tranfer model based on the calculated slip model

 

Slip model by Agalos A. email: aagalos@geol.uoa.gr
Earthquake modeled by Moshou Alexandra email: amoshou@geol.uoa.gr

References

Agalos A., Papadimitriou P., Makropoulos K., 2008. Rupture Histories of Strong Earthquakes. 31st General
Assembly of the European Seismological Commission, held at the Creta Maris
Conference Center, Hersonissos, Crete Greece, Book of Short papers, p 9-16.

Bassin, C., Laske, G. and Masters, G., 2000. The Current Limits of Resolution for Surface Wave Tomography
in North America, EOS Trans AGU, 81, F897.

Bouchon Michel, (1981). A simple method to calculate Green's functions for elastic layered media. BSSA, 71, 4, 959-971.

Harris, R., A., and Simpson R., W., (2002). The 1999 MW 7.1 Hector Mine, California Earthquake - A test of the stress
shadow hypothesis? BSSA, 92, 4, 1497-1512.

Hartzell S. H., and Heaton T. H., 1983. Inversion of strong ground motion and teleseismic waveform
data for the fault rupture history of the 1979 Imperial Valley, California, earthquake. BSSA, 73, 1553_1583.

Moshou A., Papadimitriou P., Makropoulos K., 2008. Waveform Inversion using Teleseismic and
Regional Data for Earthquakes that Occurred in Greece. 31st General Assembly of the European
Seismological Commission, held at the Creta Maris Conference Center, Hersonissos, Crete Greece,
Book of abstracts, p 95.

Wessel, P. and W. H. F. Smith., 1991. Free software helps map and display data, EOS Trans. AGU, 72, 441.