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۱THE 2005 NOVEMBER 27 QESHM ISLAND EARTHQUAKE (IRAN), MW 6.0, AFTERSHOCK SEISMICITY
نویسنده(ها): ، ،
اطلاعات انتشار: پنجمین کنفرانس بین المللی زلزله شناسی و مهندسی زلزله، سال
تعداد صفحات: ۶
From 2005 December 2 to 2006 February 26, a dense seismological network of 17 stations was installed in the epicentral region of the 2005 November 27 Qeshm earthquake sequence. Epicentral and depth distribution of the aftershocks is diffuse and it is difficult to define simple alignments related to faults. This implies that different faults had involved creating such diffuse pattern. However depth distribution of selected events in eastern end of the aftershock zone reveals one alignment trending NW with ~45º dip. Upper limit for depth is close to 20 km that is more than other calculated depths in the Zagros by local networks. Pattern of the calculated focal mechanisms indicates two families of mechanisms: strike–slip and reverse mechanisms. This complexity can be explained by two scenarios: the first one that is compatible with geological observation is triggering of the right–lateral strike–slip fault in NW–SE direction because of the energy release of the reverse fault that is not supported well by distribution of aftershock seismicity. Another explanation could be that deformation in western edge of the Hormoz strait is accommodated by partitioning between the strike–slip and reverse faulting.<\div>

۲THE 2006 FEBRUARY 28 TIAB EARTHQUAKE (IRAN), MW 6.0, AFTERSHOCK SEQUENCE
نویسنده(ها): ، ،
اطلاعات انتشار: پنجمین کنفرانس بین المللی زلزله شناسی و مهندسی زلزله، سال
تعداد صفحات: ۵
From 2006 February 28 to 2006 April 1, a temporary seismological network was deployed in the epicentral region of the 2006 February 28 Tiab earthquake, Mw 6.0, to study aftershocks. Epicentral distribution of the aftershocks is diffuse and we can not define simple alignment. At depth aftershocks are concentrated between 15 and 25 km that imply different characteristic of the earthquakes in this region from those in the Zagros. The depth of the aftershocks increases northeastward gently that could be associated to a thrust fault with a very low angle dip. Calculated focal mechanisms for aftershocks also verify low angle thrusting consistent with focal mechanism of the other events in this region calculated by body wave modeling. This can be related to underthrusting of the Arabian plate beneath Central Iran in eastern end of the Zagros in north of the Zendan–Minab–Palami Fault system.<\div>
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