On the radially heterogeneous media elastic deformation within source zones

Category: 13-3
M.S. Molodenskiy, D.S. Molodenskiy


UDC 550.31


M.S. Molodenskiy, D.S. Molodenskiy


Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia



Surface displacement fields in the area of the city of Antofagasta in the Central Andes are calculated for a set of models of the fault zone differing by the fault orientation, extent, and orientation of Burgers' vector. For the solution of the inverse problem of definition of the source zone parameters according to GPS-data, the 5-dimensional parameterization of the fault plane is used. In order to reduce the amount of independently varied parameters, the fault plane is assumed flat. The distribution of elasticity modules by depth is defined accordingly to continental model PREM. To minimize the mean square deviations between observed and theoretical data the method of the quickest release in five-measured space is used.

Keywords: models of a tectonic source zones, GPS-data.



Barbot, S., Hamiel, Y., and Fialko, Y., Space geodetic investigation of the coseismic and postseismic deformation due to the 2003 Mw7.2 Altai earthquake: Implications for the local lithospheric rheology, J. Geophys. Res., 2008, no. 113, doi:10.1029/2007JB005063.

Crone, A.J., Personius, S.F., Craw, P.A., Haeussler, P.J., and Staft, L.A., The Susitna Glacier thrust fault-characteristics of ruptures that initiated the 2002 Denali fault earthquake, Bull. Seismol. Soc. Amer., 2004, vol. 94, no. 6B, pp. 5–22.

Fialko, Y., Simons, M., and Agnew D.n The complete (3-D) surface displacement field in the epicentral area of the 999 Mw7.1 Hector Mine earthquake, southern California, from space geodetic observations, Geophys. Res. Lett., 2001, no. 28, pp. 3063–3066.

Fukushima, Y. and Kose, O. Attenuation characteristics of peak ground acceleration from fault of the 1999 Kocaeli (Turkey) earthquake and comparison of spectral acceleration with seismic design code, J. Seismol., 2002, vol. 6, no. 3, pp. 379–396.

Hreinsdóttir, S., Freymueller, J.T., Fletcher, H.J., Larsen, C.F., and Bürgmann, R., Coseismic slip distribution of the 2002 MW 7.9 Denali fault earthquake, Alaska, determined from GPS measurements, Geophys. Res. Lett., 2003, vol. 30, pp. 1670, doi: 10.1029/2003GL017447.

Klotz, J. and Angermann D., GPS – derived deformation of the central Andes including the 1995 Antofagasta Mw=8.0 earthquake, Pure Appl. Geophys., 1999, vol. 154, pp. 709–730.

Love, A.E.H., A treatise on the mathematical theory of elasticity, Cambridge: Cambridge Univ. Press, 1906.

Masters, T.G. and Widmer R., Free oscillations: Frequencies and Attenuations, Global Earth Physics A Handbook of Physical Constants AGU Reference Shelf, 1995, pp. 104–125.

Mikhailov, V.O., A. N. Nazaryan A.N., Smirnov V.B., Diament, M., Shapiro, N., Kiseleva, E.A.,  Tikhotskii, S.A., Polyakov, S.A., Smol’yaninova, E.I., and Timoshkina .P.,  Joint inversion of the differential satellite interferometry and GPS data: A case study of Altai (Chuia) Earthquake of September 27, 2003, Izv. Phys. Solid Earth, 2010, vol. 46, no. 2, pp. 91-103.

Molodenskii, M.S., Models of elastic displacements within source zones, Izv. Phys. Solid Earth, 2009, vol. 45, no. 9, pp. 832-837.

Nissen, E. Emmerson, B., Funning, G.J., Mistrukov, A., Parsons, B., Robinson, D.P., Rogozhin, E., and Wright, T.J., Combining InSAR and seismology to study the 2003 Siberian Altai earthquakes – dextral strike-slip and anticlockwise rotations in the northern India–Eurasia collision zone, Geophys. J. Int., 2007, no. 169, pp. 216–232.

Okado, Y., Surface deformation due to shear and tensile faults in a half-space, Bull. Seismol. Soc. Amer., 1985, vol. 75, pp. 1135–1154.

Okado, Y., Internal deformation due to shear and tensile faults in a half-space, Bull. Seismol. Soc. Amer., 1992, vol. 82, no. 2, pp. 1018–1040.

Piersanti, A., Spada, G., Sabadini, R., and Bonafede, M., Global post-seismic deformation, J. Geophys. Res., 1995, no. 120, pp. 544–566.

Pollitz, F., Coseismic deformation from earthquake faulting on a layered spherical Earth, Geophys. J. Int., 1996, no. 125, pp. 1–14.

Pollitz, F., Gravitational viscoelestic postseismic relaxation on a layered spherical Earth, J. Geophys. Res., 1997, no. 102, pp. 17.921–17.941.

Ratchkovski, N.A., Hansen, A., Stachnik, J.C., Cox, T., Fox, O., Rao, L., Clark, E., Lafevers, M., Estes, S., MacCormack, J.B., and Williams, T., Aftershock sequence of the MW 7.9 Denali, Alaska, earthquake of 3 November 2002 from regional seismic network data, Seismol. Res. Lett., 2003, vol. 74, pp. 743–752.

Sabadini, R., Piersanti, A., and Spada, G., Toroidal/poloidal partitioning of global post-seismic deformation, Geophys. Res. Lett., 1995, no. 21, pp. 985–988.

Sun, W. and Okubo S., Surface potential and gravity changes due to internal dislocations in spherical Earth. I. Theory for a point dislocation, Geophys. J. Int., 1993, no. 114, pp. 569–592.

Bernard, P. and Briole, P., The Ms=6.2, June 15, 1995 Aigion earthquake (Greece): evidence for low angle normal faulting in the Corinth rift, J. Seismol., 1997, vol. 1, no. 2, pp. 131–150.