Ministry of Housing & Urban Development

Building and Housing Research Center

Iran Strong Motion Network

www.bhrc.ac.iriranstrongmotion@bhrc.ac.ir

Iran strong motion network (ISMN)

Tectonic map of the world

Seismicity of Iran (1973-2003)

Iran strong motion network (ISMN) 1002 (SSA-2) accelerographs74 (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 seismotectonics2 -Regional geology

3 -Reasonable coverage of various site conditions4-Topography

5 -Seismic hazard map of Iran6 -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 )

Digital accelerograph (SSA-2)

Solid state recorder (SSR1)

Analogue accelerograph (SMA-1)

Portable drum recorder(PS2)

Instruments of Iran strong motion network

Number of accelerographs of ISMN

740 5 7190125133157167191228239244

274274

1002

343425

575

731848

870 923 939 970 987

1076105810601064105610271015

922

664

279274

587587

0

200

400

600

800

1000

1200

year

num

ber o

f acc

eler

ogra

phs

SMA1 SSA2 SMA1+SSA2

Free field stations of ISMN

Number of accelerograms (4604) recorded by ISMN

PGA> 0.4g recorded in Iran

F.D. E.D. U.P.G.A

E N D-M-Y H:M:S E N (km) (km) mb Ms (CM/S/S)Vandik* 59.23 33.82 1976/11/09 17:59:54 59.20 33.80 29 4 5.1 545 IINaqan* 50.72 31.93 1977/04/06 13:36:00 50.76 31.90 5 5.6 6.1 872 IIDeyhook* 57.50 33.29 1978/09/16 15:35:57 57.44 33.37 34 10 7.4 6.4 411 ITabas* 56.92 33.58 1978/09/16 15:35:57 57.44 33.37 34 54 7.4 6.4 897 IIAb-bar* 48.97 36.92 1990/06/20 21:00:11 49.41 36.96 18 39 6.4 7.7 635 IManjil* 49.40 36.73 1990/06/24 09:46:01 49.42 36.88 10 17 5.1 4.7 415 IISefidrood Dam 3* 49.39 36.75 1991/11/28 17:19:53 49.60 36.92 15 27 5.6 5.0 445 Imeymand* 52.75 28.87 1994/06/20 09:09:02 52.61 28.96 8 17 5.7 5.9 503 IIZanjiran 52.62 29.07 1994/06/20 09:09:02 52.61 28.96 8 12 5.7 5.9 1006 IIFin 55.88 27.62 1995/01/24 04:14:26 55.63 27.56 33 26 4.9 0.0 554Kariq 48.06 37.95 1997/02/28 12:57:45 48.06 38.07 10 13 5.5 6.1 616Meymand 52.75 28.87 1997/08/24 21:11:24 52.60 28.63 33 30 5.0 4.1 704 IITazareh* 54.46 36.39 1997/11/03 06:59:31 54.45 36.33 33 7 4.8 463Sirch* 57.56 30.19 1998/03/14 19:40:27 57.60 30.15 9 6 5.9 6.9 750 ISeymareh Dam 47.18 33.29 1998/10/04 00:42:47 47.25 33.24 10 9 5.3 4.9 711Balaadeh 51.93 29.29 1999/05/06 23:00:53 51.88 29.50 33 24 5.9 6.3 423Ali Abad 54.87 36.82 1999/11/26 04:27:24 54.90 36.92 33 11 5.2 4.8 459Boldaji 51.06 31.94 2000/03/07 01:05:02 50.80 31.96 48 25 4.4 570Aghajari 49.71 30.70 2000/10/10 03:08:10 50.02 30.84 33 522Aghajari 49.71 30.70 2000/10/13 21:12:06 49.68 30.70 33 3 4.7 3.9 728Gazanak 52.22 35.90 2001/06/24 07:05:18 52.18 35.84 4 8 3.6 489Avaj 49.22 35.58 2002/06/22 02:58:20 48.93 35.67 10 28 6.2 6.4 499Dobaran 28.40 54.18 2003/12/15 22:57:22 28.31 54.15 10 10 5.0 748Dobaran 28.40 54.18 2003/12/23 06:32:38 28.43 54.09 33 9 4.9 860Bam 29.09 58.35 2003/12/26 01:56:56 29.09 58.35 6 7 6.3 989 IIAbad 29.02 51.25 2004/03/02 07:51:47 29.02 51.06 4 5.1 412

Station sitegeology

MagnitudeGeog. Coord. Origin Time Epicenter

Peak Ground Acceleration recorded in Iran

Accelerograms of Naghan earthquake ( 4 June 1977) Accelerogram of Tabas earthquake (16 September 1978)

Accelerogram of Golbaf earthquake ( 28 July 1981) Accelerogram of Rudbar Earthquake (20 June 1990)

Important accelerograms recorded in Iran

Accelerogram of Zanjiran earthquake( June 20, 1994)

Accelerogram of Sarein earthquake (Feb 28, 1997) Accelerogram of Avaj earthquake( June 22, 2002)

Important accelerograms recorded in Iran

Instrumentation of dams

Number of dams = 54

Number of accelerographs installed = 92

Accelerograms recorded in dams = 222

Jirooft dam (3 digital accelerographs)

Sefirood dam (3 digital accelerograph)Rajaei dam (6 digital accelerographs)

Izadkhast dam (2 digital accelerographs

Structural array at the Ministry of Housing & Urban Development

groups Constituent materials Vs (m/sec)

I

A) Igneous rocks (coarse and fine grained texture), hard and stiff sedimentary rocks and massive metamorphic Rocks (Gneiss, crystalline silicate rocks) b) Conglomerate beds, stiff soil (compact sand and gravel and stiff clay) with over 30 meters in thickness.

More than 750  

More Than 750

IIa) Loose igneous rocks (such as tuff), friable sedimentary rocks, foliated metamorphic rocks and the rocks that have been loosened (decomposed) by weathering b) Stiff soil (compact sand and gravel and stiff clay) with thickness less than 30 meters..

375 Vs 750  

 375 Vs 750

IIIa) Rocks disintegrated by weathering b) Medium compaction soils, beds of gravel and sand with medium intragranular cementation bond and clay of an intermediate stiffness.

175 Vs 375 

 175 Vs 375

IVa) Soft and wet deposits resulted from high level of water table. b) Any kind of soil containing a 6-meter high clay layer less than 175 with cementation index over 20 and humidity percentage over 40.

Less than 175

Classification of site geology of Iranian code of practice

Geophysical and investigation for site geology (90 stations)

Earthquakes greater than M5.0 during the past 25 years

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

Earthquake Data Time M N E Dead Injured Record PGA (gal)Tabas 1978 09 16 15:35:56 7.8 33.39 57.4 18220 many 9 915Ardebil 1978 11 04 15:22:19 6.1 37.67 48.9 1 281

Kouzestan 1978 12 14 07:05:20 6.2 32.14 49.7 NO NoSarbaz 1979 01 10 01:26:09 6 26.61 60.9 1 41Sarbaz 1979 01 10 15:05:48 6.1 26.52 61 1 69

Korizan 1979 01 16 09:50:10 6.9 33.9 59.5 12 78Korizan 1979 11 14 02:21:22 6.8 33.92 59.7 420 many 10 86

koli-Boyabad 1979 11 27 17:10:32 7.5 33.96 59.7 130 many 14 137koli-Boyabad 1979 12 07 09:24:00 6.3 34.03 59.8 2 61

Gilvan 1980 05 04 18:35:20 6.3 38.05 49 1 39Golbaf 1981 06 11 07:24:25 6.9 29.91 57.7 1100 4000 2 39Sirch 1981 07 28 17:22:22 7.1 30.19 57.6 1300 >1000 7 304

Khash 1983 04 18 10:58:51 6.5 27.79 62.1 1 30Gonbad 1985 10 29 13:13:44 6 36.69 54.8 5 56Nurabad 1988 08 11 16:04:45 6.1 29.97 51.7 2 105Rudbar 1990 06 20 21:00:09 7.7 36.96 49.4 40000 many 23 635

Hormozgan 1990 11 06 18:45:52 6.7 28.25 55.5 No NoBehbahan 1991 11 04 01:50:31 5.4 30.67 50.2 0 50 1 23Dadenjan 1992 09 08 00:38:15 5.2 29.13 52.2 1 11 2 52Sefidabeh 1994 02 24 00:11:12 6.3 30.77 60.5 6 >20 No NoSefidabeh 1994 02 26 02:31:11 6.1 30.9 60.6 No No

Muk 1994 03 01 03:49:00 6.1 29.1 52.6 2 50 1 119Zanjiran 1994 06 20 09:09:02 6.1 28.97 52.6 3 100 13 1006

Garmkhan 1995 02 04 10:37:47 7.1 37.66 57.3 100 >1000 15 110Sarein 1997 02 28 12:57:18 6.1 38.07 48.1 965 2600 21 615

Ardakul 1997 05 10 07:57:29 7.3 33.82 29.7 1560 4000 28 195Golbaf 1998 03 14 19:40:27 6.9 30.15 57.6 5 50 5 41

Galehganj 1999 03 04 23:00:53 6.3 29.5 51.9 12 54Karehbas 1999 05 06 23:00:53 5.9 29.5 51.9 26 100 17 423

Polabgineh 1999 10 31 15:09:39 5.2 29.41 51.8 0 28 6 100Salehabad 1999 11 08 21:37:24 5.5 35.73 61.2 0 >50 3 333

Aliabd 1999 11 26 04:27:24 5.2 36.92 54.9 0 0 5 300Dinehvar 2002 04 24 19:48:05 5.2 34.64 47.4 0 10 7 200

Changureh 2002 06 22 02:58:21 6.5 35.63 44.1 230 1466 74 498

Number of Earthquakes with Magnitude >5

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 شدت زمينلرزه 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 اصالح

شده در بخشهايي IXاز بم و بروات بوده است.

شبكه شتابنگار

ي منطقه

بم پس از زلزله

BamBaravat

Bam fault

Bam castle

Governor of Bam

Accelerograph of Bam station

Tehran Strong Motion Network

Strong motion network in Tehran Province Total accelerographs:86Total accelerograms recorded:56

Tehran city strong motion network Number of accelerographs:45

Number of accelerograms:21