Document Type : Original Research Paper


1 Ph.D. Student, Department of Geology, University of Birjand, Birjand, Iran

2 Professor, Department of Geology, University of Birjand, Birjand, Iran

3 Assistant Professor, Department of Geology, University of Birjand, Birjand, Iran

4 Associate Professor, Geomatics College, National Cartographic Center of I.R., Tehran, Iran


In the S,W Lut Block, geodetic moment rate is more than seismic and geological moment rates. Depending on the type of deformation and geometry of the faults, the study area divided to the 4 parts : northern, central, southern and southeastern (South Lut Block) parts. Values of  three types of moment rates in these area are comparing  with each other. The most of geodetic moment rate was obtained respectively in northern, central, southern, southeastern parts of the study area. Geodetic moment  rate in the northern part is 2.28E+18 Nm.yr, the central part is 1.86E+18 Nm.yr, the southern part is 1.20E+18 Nm.yr and in the southeastern is 1.10E+18 Nm.yr. The most of seismic moment rate was obtained respectively in central, southeastern, southern, northern parts of the study area. Seismic moment  rate in the central part is 5.62316E+17 Nm.yr, in the southeast part is 2.05331E+17 Nm.yr, in the southern part is 1.18984E+17 Nm.yr and in the northern part is 1.03408E+17 Nm.yr. According to Seismic map, maximum seismic moment, respectively is along Gowk, Shahdad, Davaran, East Kerman, Mahan, Bam, Kuhbanan, Dahueiyeh, North Faryab Faults. These faults are responsible for  large earthquakes in the study area. The most of geological moment rate was obtained respectively in southern, northern, central, southeastern parts of the study area. Values of geological moment rate for the southern part is 4.16246E+15 Nm.yr, northern part is 2.74157E+15 Nm.yr, centra part is 2.5895E+15 Nm.yr and in the southeastern is 1.08894E+15 Nm.yr. In the study area, maximum geological moment rate is respectively related to west Sabzevaran, Jiroft, Raver, Dalfard, Kuhbanan, Naybandan, Bam, Gowk, Davaran faults. According to values of geological and geodetic moment rates in the four parts of study area and based on the value of the release seismic energy in the central and southeastern parts, it seems that in the next time, the most of seismic potential and seismic hazard are respectively in the northern, southern, central, southeastern parts of the study area. In study area, maximum seismic moment are at years 1981, 1998, 2003, 2010, 2011, 1999, 2005 respectively. Ratio of the geodetic moment rate to the seismic moment rate obtained more than 7.9. This ratio reflects the important role of interseismic deformation in this area. According to the ratio seismic moment rate to geodetic moment rate, in four parts of the study area, can be conclude that the northern and southern parts with ratio: 0.04 and 0.09 are slow strain areas and the central and southeastern parts with ratio 0.30 , 0.18 are fast strain areas. Ratio of seismic moment rate to geological moment rate is 0.93%. This value indicates that 0.93% potential of the faults for seismic energy has been released and not been released a big part of the elastic energy in the area.


Allen, M., Kheirkhah, M., Emami, M. H. and Jones, S. J., 2010- Right- lateral shear across Iran and kinematic change in the Arabia– Eurasia collision zone. Geophys. J. Int.1- 20.
Ambraseys, N. N. and Melville, C. P., 1982- A history of Persian earthquakes. Cambridge University press, Cambridge, UK.
Angelica, C., Bonforte, A., Distefano, G., Serpelloni, E. and Gresta, S., 2013- Seismic potential in Italy from integration and comparison of seismic and geodeticstrain rates. Tectonophysics, 608, 996-1006.
Berberian, M. and Yeats, R. S., 1999- Patterns of historical rupture in the Iranian Plateau. Bull. Seismol. Soc. Am. 89 (1), 120–139.
Foroutan, M., Meyer, B., Sebrier,M., Nazari, H., Murray, A. S., Dortz, K. Le., Shokri, M. A., Arnold, M., Aumaitre, G., Bourles, D., Keddadouche, K., Solaymani Azad Sh. and Bolourchi, M. J., 2014- Late Pleistocene-Holocene right-slip rate and paleoseismology of the Nayband fault, western margin of the Lutblock, Iran, Geophysical Research, 119, 3517-3560.
Hanks, T. C. and Kanamori, H., 1979- A moment magnitude scale. J. Geophys.Res, 84, 2348-2350.
Heaton, T. H., Tajima, F. and Mori, A. W., 1986- Estimating ground motions recorded accelerorams. Surveys in Geophysics, 8, 25-83.
Jahnston, A., 1996- Seismic moment assessment of earthquakes in stable continental regions-III. New Madride 1811-1812, Chaleston 1886 and Lisbon 1755. Geophys.J.Int, 126, 314-344.
Kanamori, H., 1977- Seismic and aseismic slip along subduction zones and their tectonic implications. Maurice Ewing Ser, 1, 162-174.
Kreemer, C., Chamot-Rooke, N. and Pichon, X. L., 2004- Constraints on the evolution and vertical coherency of deformation in the Northern Aegean from a comparison of geodetic, geologic and seismologic data, Earth and Planetary Science, 225, 329-346.
Mohajjel, M., 2009- Thin-skinned deformation near Shahdad, southeast Iran. Journal of Asian Earth Sciences, 36, 146-155.
Newman, A. V., Dixon, T. H., Ofoegbu, G. I. and Dixon, J. E., 2001- Geodetic and seismic constraints on recent activity at Long Valley Caldera, California: evidence for viscoelastic rheology, Volcanology and Geothermal Research, 105, 183-206.
Pancha, A., Anderson, J. G. and Kreemer, C., 2006- Comparison of seismic and geodetic scalar moment rates across the Basin and Range province. Bulletine of the seismological society of America, 96, No. 1, 11-32.
Regard, V., Bellier, O., Thomas, J. C., Bourlès, D., Bonnet, S., Abbassi, M. R., Braucher, R., Mercier, J., Shabanian, E., Soleymani, Sh. and Feghhi, Kh., 2005- Cumulative right-lateral fault slip rate across the Zagros-Makran transfer zone: role of the Minab-Zendan fault system in accommodation Arabia-Eurasia convergence in southeast Iran. Geophys. J. Int, 162, 177-203.
Walker, R. and Jackson, J., 2004- Active tectonics and late Cenozoic strain distribution in central and eastern Iran. Tectonics, 23, TC5010.
Walker, R. T., Talebian, M., Sloan, R. A., Rashidi, A., Fattahi, M. and Bryant., C., 2010- Holocene slip-rate on the Gowk strike-slip fault and implications for the distribution of tectonic strain in eastern Iran.  Geophys.J. Int,  181, 221-228.
Walker, R., Jackson, J. and Baker, C., 2003- surface expression of thrust faulting in eastern Iran: souece parameters and surface deformationof the 1978 Tabas and 1968 Ferdows earthquake sequences, Geophysical Journal International, 152, 749-765.
Ward, S. N., 1998- On the consistency of earthquake rates, geological fault data, and space geodetic strain: the United States. Geophys. Jour.Int, 134, 172-187.