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Ministry of Housing & Urban Development Building and Housing Research Center Iran Strong Motion Network. www.bhrc.ac.ir iranstrongmotion@bhrc.ac.ir. Iran strong motion network (ISMN). Tectonic map of the world. Seismicity of Iran (1973-2003). Iran strong motion network (ISMN).
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Ministry of Housing & Urban Development Building and Housing Research Center Iran Strong Motion Network www.bhrc.ac.ir iranstrongmotion@bhrc.ac.ir
Iran strong motion network (ISMN) 1002 (SSA-2) accelerographs 74 (SMA-1) accelerographs
Criteria for selection of stations in ISMN The optimal choice of locations for installing the accelerographs is of great and significant important. There are some factors to be considered in location determinations. 1- Seismicity and seismotectonics 2- Regional geology 3- Reasonable coverage of various site conditions 4-Topography 5- Seismic hazard map of Iran 6- Important Structure (dams, high rise buildings, etc) 7- Local facilities (power, road, etc.)
Instruments of Iran strong motion network • Analogue accelerographs(SMA-1, 74operational) • Digital accelerographs (SSA-2, 1002operational) • Solid state recorder (SSR1, 4 ready for aftershock studies) • - Portable drum recorder(PS2, 1 ready for aftershock studies )
Instruments of Iran strong motion network Digital accelerograph (SSA-2) Analogue accelerograph (SMA-1) Solid state recorder (SSR1) Portable drum recorder(PS2)
Important accelerograms recorded in Iran Accelerogram of Tabas earthquake (16 September 1978) Accelerograms of Naghan earthquake ( 4 June 1977) Accelerogram of Golbaf earthquake ( 28 July 1981) Accelerogram of Rudbar Earthquake (20 June 1990)
Important accelerograms recorded in Iran Accelerogram of Zanjiran earthquake( June20, 1994) Accelerogram of Sarein earthquake (Feb 28, 1997) Accelerogram of Avaj earthquake( June22, 2002)
Instrumentation of dams Number of dams = 54 Number of accelerographs installed = 92 Accelerograms recorded in dams = 222
Rajaei dam (6 digital accelerographs) Sefirood dam (3 digital accelerograph) Jirooft dam (3 digital accelerographs) Izadkhast dam (2 digital accelerographs
Structural array at the Ministry of Housing & Urban Development
Geophysical and investigation for site geology (90 stations)
List of destructive earthquakes the last 25 years 225 Earthquakes with Magnitude between 5-6 22 Earthquakes with Magnitude between 6-7 6 Earthquakes with Magnitude >7
Changureh-Avaj Earthquake of June 22, 2002 Time: 02:58:20 Mw=6.5 PGA :0.498 g Total accelerograms:75 Maximum intensity:VIII
شدت زمينلرزه گستره ناحيه بيشترين شدتزمينلرزه نسبتا محدود بوده و شهرهاي بم و بروات و روستاهاي پيرامون آنها را در بر مي گيرد. بر اساس بر آورد ما بيشينه شدت براساس مقياس مركالي اصلاح شده در بخشهايي از بم و بروات IX بوده است.
شبكه شتابنگاري منطقه بم پس از زلزله
Bam castle Bam Baravat Bam fault
Strong motion network in Tehran Province Total accelerographs:86 Total accelerograms recorded:56
Number of accelerographs:45 Number of accelerograms:21 Tehran city strong motion network