Patterns of Historical Earthquake Rupture in the Iranian Plateau

Patterns of Historical Earthquake Rupture in the Iranian Plateau 131^~.~-/,,// \LAKE URU~.~ ~,_+1275o.-- E~ 1965.02.10 -~ (v~,~.~)- 1 900 N ~ ~ 900 -- E~I~ -1807.07.1 I(>Vl 1+,5.5)- -~ ~786.~o.oo(v~ ,6.~) ~7~O.O~.08(~X+,7.~+,L>~2T"F~ R ~A ~.=) ~ ~800-_ -- 1500M G D TABRIZTABR I ZRUPTURE 1 [R1]~~~~~~ -:~-- 1717.03.12(VI IT5.9) BASMENJ, SHEBL I BOSTANABADUJAN1700-1641.02.05(VI I 1+,6.8)1600-1550 O00Q r-~(>V~ r,>5". 3)~ 1 500 -1304.11 .07(VI I 1+,6.7) ----’J7~-~~ u~ 1 400 -~ -?~0~? ~ ~1300TABRIZ CLUSTER "B" ? [31 YRS] -?~01273.01 .18(Vl I 1+,6.5)~0T¯ 1200--- 1000_ FO 7.0--7.9EST I MATEDMAGN I TUDE 6.0-6 9- (Ms)5.0-5 9--100 80 60[DISTANCE(km)]40 201042.11 .04( I X+,7.3) z.L.TABR I Z,,=,1.", 11 oo-~,°1’ 1000-~’858.oo.oo(vl ~+,6.0)"°._L.~900?~o ~ ?oTABRIZ 20J J40l60 "180Figure 7. Meizoseismal area of large-magnitude earthquakes and space-time diagramsof nearly 1140 yr of seismicity of the Tabriz region, northwest Iran. Symbolsas in Figure 2. Surface rupture associated with the 1721 and 1780 earthquakes shownin bold lines. Distances are along strike with respect to Tabriz.Marand-Mishu earthquakes corresponds to the boundary betweenthe NTF and the Mishu fault (Fig. 7).The Tabriz-Dehkharqan earthquake (M-- 6.8) in 1641(Melville, 1981) was south of the boundary between theShebli and Tabriz earthquake. The earthquake was witnessedand documented by the Armenian celibate priest Arakel VartabedTavrizetsi (1670) and also by Mohammad Nassir(1641), who was assigned by the government to evaluate thedamage and death toll. The northeast-trending meizoseismalzone of the earthquake does not correspond to any mappedfault. The southeastern continuation of the NTF has had historicalearthquakes only smaller than M 6, which is also thecase for the northwestern continuation of the Mishu-Sufianreverse faults (Fig. 7).