پديد آورندگان :
نادري، فتح الله دانشگاه سيستان و بلوچستان - دانشكده جغرافيا و برنامه ريزي محيطي - گروه ژئومورفولوژي , فتوحي، صمد دانشگاه سيستان و بلوچستان - دانشكده جغرافيا و برنامه ريزي محيطي - گروه ژئومورفولوژي , نگارش، حسين دانشگاه سيستان و بلوچستان - دانشكده جغرافيا و برنامه ريزي محيطي - گروه ژئومورفولوژي , خليلي، مرضيه دانشگاه شيراز - دانشكده علوم زمين - گروه زمين شناسي
كليدواژه :
زلزله ازگله , ناپايداري هاي ژئومورفولوژيكي , پهنه بندي , چين خوردگي , جوان زاگرس
چكيده فارسي :
ﻫﺪف اﺻﻠﯽ اﯾﻦ ﭘﮋوﻫﺶ ﻣﻄﺎﻟﻌﻪ ﻧﺎﭘﺎﯾﺪاري ﻫﺎي ژﺋﻮﻣﻮرﻓﻮﻟﻮژﯾﮑﯽ ﺣﺎﺻﻞ از زﻟﺰﻟﻪ ازﮔﻠﻪ در اﺳﺘﺎن ﮐﺮﻣﺎﻧﺸﺎه و اﯾﻼم ﺑﺎ اﺳﺘﻔﺎده از ﻣﻄﺎﻟﻌﺎت ﻣﯿﺪاﻧﯽ و ﺗﺼﺎوﯾﺮ ﻣﺎﻫﻮاره اي و ﭘﻬﻨﻪ ﺑﻨﺪي آﻧﻬﺎ ﻣﯽ ﺑﺎﺷﺪ. ﻣﻨﻄﻘﻪ ﺗﺤﺖ ﺗﺄﺛﯿﺮ اﯾﻦ زﻟﺰﻟﻪ ﺑﺴﯿﺎر ﻣﺴﺘﻌﺪ وﻗﻮع اﻧﻮاع ﺣﺮﮐﺎت و ﻧﺎﭘﺎﯾﺪاري ﻫﺎي ژﺋﻮﻣﻮرﻓﻮﻟﻮژﯾﮑﯽ اﺳﺖ. دﻻﯾﻞ آن، وﺟﻮد ﭼﯿﻦ ﺧﻮردﮔﯽ ﻫﺎي ﺟﻮان زاﮔﺮس ﻫﻤﺮاه ﺑﺎ ﻋﻤﻠﮑﺮد ﮔﺴﻞ ﻫﺎي ﻗﻄﻊ ﮐﻨﻨﺪه آﻧﻬﺎﺳﺖ ﮐﻪ ﺧﺮدﺷﺪﮔﯽ ﻫﺎي ﺷﺪﯾﺪي را درﻣﻨﻄﻘﻪ اﯾﺠﺎد ﮐﺮده اﻧﺪ. ﺑﺮاي اﻧﺠﺎم اﯾﻦ ﺗﺤﻘﯿﻖ اﺑﺘﺪا ﻧﺎﭘﺎﯾﺪاري ﻫﺎي ژﺋﻮﻣﻮرﻓﻮﻟﻮژﯾﮑﯽ ﺷﺎﺧﺼﯽ ﮐﻪ در ﺗﺸﺪﯾﺪ ﺧﺴﺎرات ﻧﺎﺷﯽ از زﻟﺰﻟﻪ ﻣﺆﺛﺮ ﺑﻮده اﻧﺪ ﻣﻮرد ﺷﻨﺎﺳﺎﯾﯽ ﻗﺮار ﮔﺮﻓﺘﻨﺪ. ﺳﭙﺲ ﺑﺎ اﺳﺘﻔﺎده از ﻧﻘﺸﻪ ﻫﺎي ﺗﻮﭘﻮﮔﺮاﻓﯽ، زﻣﯿﻦ ﺷﻨﺎﺳﯽ، ﺗﺼﺎوﯾﺮ ﻣﺎﻫﻮاره اي و ﻋﻤﻠﯿﺎت ﻣﯿﺪاﻧﯽ اﻗﺪام ﺑﻪ ﺗﻌﯿﯿﻦ ﻣﻮﻗﻌﯿﺖ آﻧﻬﺎ ﮔﺮدﯾﺪ. اﯾﻦ ﻧﺎﭘﺎﯾﺪاري ﻫﺎ ﺷﺎﻣﻞ زﻣﯿﻦ ﻟﻐﺰش ﻫﺎ، رﯾﺰش ﻫﺎ و ﺑﻬﻤﻦ ﻫﺎي ﺳﻨﮕﯽ، ﺟﺮﯾﺎن ﻫﺎ، ﮔﺴﯿﺨﺘﮕﯽ ﻫﺎي ﺗﺎج ﺗﭙﻪ ﻫﺎ و ﻓﺮوﻧﺸﺴﺖ زﻣﯿﻦ ﻣﯽ ﺑﺎﺷﻨﺪ. ﺑﺎ اﺳﺘﻔﺎده از روش ﺗﺼﻤﯿﻢ ﮔﯿﺮي ﭼﻨﺪ ﺷﺎﺧﺼﻪ )MADM( ﻣﻨﻄﻘﻪ ﻣﻮرد ﻣﻄﺎﻟﻌﻪ از ﻟﺤﺎظ ﻧﺎﭘﺎﯾﺪاري ﻫﺎ ﭘﻬﻨﻪ ﺑﻨﺪي ﮔﺮدﯾﺪ. ﻧﺘﺎﯾﺞ ﭘﻬﻨﻪ ﺑﻨﺪي ﻧﺸﺎن داد ﮐﻪ دو ﻃﺒﻘﻪ ﺧﻄﺮ ﺧﯿﻠﯽ زﯾﺎد و ﻃﺒﻘﻪ ﺧﻄﺮ زﯾﺎد ﻣﺠﻤﻮﻋﺎً ﺑﺎ ﻣﺴﺎﺣﺘﯽ ﺑﺎﻟﻎ ﺑﺮ 6558 ﮐﯿﻠﻮﻣﺘﺮ ﻣﺮﺑﻊ ﯾﻌﻨﯽ ﺑﯿﺶ از 28 درﺻﺪ از ﻣﻨﻄﻘﻪ ﻣﻄﺎﻟﻌﺎﺗﯽ را ﺑﻪ ﺧﻮد اﺧﺘﺼﺎص داده اﻧﺪ و از ﺑﯿﻦ ﻋﻮاﻣﻞ ﻣﺆﺛﺮ در وﻗﻮع ﻧﺎﭘﺎﯾﺪاري ﻫﺎ، ﻋﻮاﻣﻞ ﺳﻦ زﻣﯿﻦ ﺷﻨﺎﺳﯽ، ﻓﺎﺻﻠﻪ از ﮔﺴﻞ و ﺷﯿﺐ ﺑﺘﺮﺗﯿﺐ ﺑﺎ 0/22 ،0/23 و 0/15 اﻣﺘﯿﺎز ﺑﯿﺸﺘﺮﯾﻦ ﺗﺄﺛﯿﺮ در اﯾﺠﺎد ﻧﺎﭘﺎﯾﺪاري ﻫﺎي ﻣﻨﻄﻘﻪ را دارا ﻫﺴﺘﻨﺪ. اﻧﻄﺒﺎق ﻧﻘﺸﻪ ﭘﻬﻨﻪ ﺑﻨﺪي ﻧﺎﭘﺎﯾﺪاري ﻫﺎ ﺑﺎ ﻧﻘﺸﻪ ﺗﻮزﯾﻊ ﻧﺎﭘﺎﯾﺪاري ﻫﺎي ﺑﯿﺎﻧﮕﺮ اﻧﻄﺒﺎق ﺑﯿﺸﺘﺮ ﻧﺎﭘﺎﯾﺪاري ﻫﺎ از ﺟﻤﻠﻪ زﻣﯿﻦ ﻟﻐﺰش ﻫﺎ، رﯾﺰش ﻫﺎي ﺳﻨﮕﯽ و ﻓﺮوﻧﺸﺴﺖ ﻫﺎ ﺑﺎ ﻃﺒﻘﺎت ﺧﻄﺮ ﺑﺎﻻ ﻣﯽ ﺑﺎﺷﺪ.
چكيده لاتين :
The main purpose of this study is to study the geomorphological instabilities resulting from the Ozgeleh earthquake in Kermanshah and Ilam provinces using field studies and satellite images and their zoning. The region affected by this earthquake is very prone to various movements and geomorphological instabilities. The reasons for this are the presence of young Zagros folds along with the operation of their cutting faults, which have caused severe fractures in the region. To conduct this study, first, the geomorphological instabilities of the index that were effective in intensifying the damage caused by the earthquake were identified. Then, using topographic maps, geology, satellite images and field operations, their location was determined. These instabilities include landslides, rock falls and avalanches, currents, hilltop ruptures, and landslides. Using multi-criteria decision making (MADM) method, the study area was zoned in terms of instabilities. The zoning results showed that the two very high risk classes and the high risk class with a total area of 6558 square kilometers, i.e. more than 28% of the study area and among the factors affecting the occurrence of instabilities, land age factors Histology, distance from fault and slope with 0.23, 0.22 and 0.15 points, respectively, have the greatest impact on creating instabilities in the region. The adaptation of the instability zoning map to the instability distribution map indicates the greater adaptation of the instabilities, including landslides, rock falls, and subsidence, to high-risk classes.
