تحقیقات کاربردی علوم جغرافیایی

تحقیقات کاربردی علوم جغرافیایی

کمی سازی زمین‌لغزش بزرگ مله‌کبود ناشی زمین لرزه7.3 سال 1396 کرمانشاه با استفاده از اینتروفرمتری

نویسنده
ابوالقاسم گورابی
استادیار گروه جغرافیای طبیعی، دانشکده جغرافیا، دانشگاه تهران، تهران، ایران
10.52547/jgs.21.60.47
چکیده
دریافت منظم و مکرر تصاویر توسط سنجنده‌های راداری امکان ارزیابی دقیق دینامیک، حرکت و جابجایی سطح زمین در هر منطقه با استفاده از تکنیک های مختلف را ممکن ساخته است. پژوهش حاضر از تکنیک رادار دیافراگم مصنوعی (InSAR) برای پایش و شناسایی ویژگی‌های فضایی زمین لغزش همراه با وقوع زمین لرزه 7.3 ازگله در استان کرمانشاه، استفاده کرده است. در این راستا هفت زوج تصویر اینترفرومتریک موجود با همبستگی خوب از داده های تصاویر سنتینل 1و2 مرتبط با منطقه کوهستانی زاگرس شمالغرب انتخاب، و بکارگرفته شده اند. به کمک تکنیک تداخل‌سنجی، تغییرات توپوگرافی پس از زمین‌لرزه نسبت به قبل از آن در گستره وقوع زمین‌لغزش، به صورت فضایی-مکانی به نقشه‌ تبدیل شده‌اند. بر همین اساس تخمین کمی از تغییرات ارتفاع محلی، حجم توده لغزشی و ضخامت رسوب همراه با زمین لغزش محاسبه و کمی شده اند. الگوی فضایی حرکت توده نشان می‌دهد که؛ زمین‌لغزش مله کبود با طول لغزشی3570 متر در امتداد جهت NW-SE و با حدود 1500-2300 متر در راستای عمود بر ستیغ کوهستان، به شکلی همگرا و جانب مرکز نسبت به محیط زمین لغزش رخ داده است. تغییرات ارتفاعی در مناطق مختلف متفاوت هستند، این مقدار در محل افتگاه 20 متر اندازه گیری شده است. ارزیابی های کمی نشان می دهند که؛ مساحت و حجم منطقه متاثر از حرکت توده زمین‌لغزش به 6.0 کیلومتر مربع (577 هکتار) با حجمی حدود 500 میلیون متر مکعب می رسد. بررسی های مقایسه ای بیانگر آن است که زمین لغزش مله کبود بزرگترین زمین لغزش چند سده گذشته ایران است. این مطالعه همچنین پتانسیل تکنیک InSAR به عنوان روشی دقیق و جایگزین برای اندازه گیری کمی حجم و مورفولوژی توده‌های لغزشی بزرگ ناشی از زمین‌لرزه را اثبات نمود.
کلیدواژه‌ها
حجم زمین لغزش
لغزش مله کبود
زلزله 7.3 ازگله (کرمانشاه)
اینترفرومتری

عنوان مقاله English

Quantification of mass wasting volume associated with the giant landslide Maleh Kabood induced by the 2017 Kermanshah earthquake from InSAR

نویسنده English

Abolghasem Goorabi
Assistant Professor, University of Tehran
چکیده English

Radar sensors obtain regular and frequent radar images from which ground motion can be precisely detected using a variety of different techniques. The interferometric synthetic aperture radar (InSAR) is utilized to retrieve the spatial characteristics of the largest coseismic landslide Maleh-Kabood, induced by the Ms 7.3 Azgleh earthquake in Kermanshah Province, Iran. The available seven interferometric pairs with good coherence selected from the Sentinel 1, 2 imagery data covering the NW-Zagros mountainous area are used in the study. The post-seismic topographic change relative to the pre-seismic over the landslide area is spatially mapped from the persistent scatterer network adjustment solution. The quantitative estimation of local elevation change, mass sliding volume and deposit thickness associated with the landslide is conducted. The spatial pattern of mass movement suggests that the giant landslide is characterized by a major sliding length of 3570 m along the NW–SE directions with an extension width of 1500-2300 m along the Maleh-Kabood and Ghoch-Bashi gully respectively, and a peak height change of 20 m in the vertical direction neat mountain ridge. The affected area of landslide mass movement reaches 6.0 km2 (577 Hectares) with the volume up to 500 million m3. Comparative studies indicated that the Maleh-Kabood landslide is the largest landslide in Iran over the past few centuries. The study also demonstrates the potential of InSAR technique as an alternative to allow the quantitative measurement of mass wasting volume associated with earthquake-induced giant landslides.

کلیدواژه‌ها English

Mass wasting volume
Maleh-Kabood landslide
earthquake 7.3 of Azgleh (Kermanshah)
InSAR
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