Abstract: During this time period, 23 earthquakes were investigated and their fault maps presented. The longest ever recorded coseismic surface faulting of 125 km was mapped during the 10 May 1997 Mw 7.2 Zirkuh earthquake along the Ābiz right-lateral strike-slip fault, and the lowest magnitude earthquake with coseismic surface rupture occurred during the 14 February 1971 Mw 5.7 Serokhi earthquake along the short Serokhi thrust fault. The largest reverse fault earthquake with coseismic surface faulting was documented during the 16 September 1978 Mw 7.3 Tabas-e Golshan earthquake. The 1997 Zirkuh earthquake was the only example of large-magnitude earthquake that ruptured multiple segments of a fault in a single earthquake, despite some of the segments moving during smaller earthquakes earlier. Notwithstanding, having a larger magnitude than the 1997 Zirkuh event, the 20 June 1990 Mw 7.3 Rudbār left-lateral strike-slip surface faulting was 45 km shorter. The Rudbār seismic gap was filled with the 1990 earthquake with 80 km coseismic left-lateral surface faulting indicating slip partitioning in the Alborz Mountains. The 1983 thrust and 1990 strike-slip earthquakes in the same region indicated that oblique convergence across the Alborz Mountains is separated into its two orthogonal components of (i) a range-normal shortening (1983) and (ii) a range-parallel strike-slip (1990) along two parallel thrust and left-lateral strike-slip faults. Regardless of their identical magnitudes and mechanism, the two earthquakes with Mw 7.1, which took place on the Dasht-e Bayāz strike-slip fault, were accompanied by surface faulting of 70 (31 August 1968) and 55 (27 November 1979) km with different amounts of maximum displacements. Cross-strike seismicity migration (1968 and 1979) as well as complex clustering of seismicity and faulting were also recorded.
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: book-chapter
Indexed In: ['crossref']
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