Slip distribution of the 2010 August 27 Mw 5.8 Kuh-Zar earthquake from finite-fault modeling

Authors

1 Institute of Geophysics, University of Tehran, Tehran, Iran

2 Physics Department, Zanjan University, Zanjan, Iran

Abstract

The slip distribution of a moderate earthquake in Iran, the 27th of August, 2010 Mw 5 : 8 Kuh-Zar earthquake, was estimated from regional broadband seismic data using constrained non-negative least squares linear slip inversion method. A great many inversions were carried to determine the optimal parameters used in the process such as rupture velocity and rise time. A rupture velocity of 2.55 km/s and rise time of 1.8 s were utilized for the event. Results show a rupture with peak slip of 15.0 cm and total seismic moment release of 2 × 1025 dyne-cm. The effect of the stations with different epicentral distances was also analyzed using a sensitivity test. Due to the non-uniqueness of the inversion problem, a set of solutions is presented for the Kuh-Zar earthquake. To the best of our knowledge, this is the first time to consider constrained non-negative least square linear finite-fault inversion procedure to the Kuh-Zar earthquake.
 

Keywords


[1] Mirzaei N., Mengtan G., Yuntai C., 1998, J. Earth. Predict. Res., 7, 465-495

[2] Berberian M., Navai I., 1977 A preliminary feild report and a seismotectonic, 51

[3] Saikia C. K., 1994, Geophys. J. Int., 118, 142-158

[4] Hartzell S. H., Heaton T. H., 1983, Seismol. Soc. Am., 73(6A), 1553-1583

[5] Abercrombie R. E., Bannister S., Pancha A., Webb T. H., Mori J. J., 2001, Geophys. J. Int., 146(1), 134-142 APJ, 194, 802

[6] Shahvar M. P., Zar'e M., 2013, Natural hazards, 66(2), 689-706

[7] Ashtari M., Hatzfeld D., Kamalian N., 2005, Tectonophysics, 395(3), 193-208

[8] Hartzell S. H., Liu P., Mendoza C., Ji C., Larson K. M., 2007, Seismol. Soc. Am., 97,1911-1934

[9] Scholz C. H., 1990, Cambridge University press, Cambridge 146(1), 134-142

[10] Lay T., Wallace T. C., 1995, Modern global seismology, Academic Press, San Diego

[11] Doser D. I., Kanamori H., 1986, Geophys. Res., 91(B1), 675-688

[12] Hartzell S. H., Heaton T. H., 1986, Seismol. Soc. Am., 76(3), 649-674

[13] Mendoza C., Hartzell S. H., 1988, Seismol. Soc. Am., 78, 1438-1449

[14] Reasenberg P., Ellsworth w. L., 1982, J. Geophys. Res., 87(B13), 10637-10655