تعیین مناطق مناسب انجام مشاهدات ژئودتیکی به‌منظور رفتارسنجی و مطالعه مکانیک گسل شمال تبریز با آنالیز حساسیت مدل تحلیلی اکادا به روش HDMR

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

دانشکده مهندسی عمران، دانشگاه تبریز

چکیده

با ظهور فناوری­ های جدید مانند GPS (Global Positioning System) و انجام مشاهدات باکیفیت بالا، می­توان مطالعات بسیاری را در مورد مسائل زمین ­ساختی شروع کرده یا بهبود بخشید. بااین‌حال کیفیت و قابلیت اطمینان نتایج حاصل از این مطالعات به محل ایستگاه­ ها یا به‌عبارت‌دیگر به طرح شبکه­ های ژئودینامیکی بستگی دارد. هدف این تحقیق بهینه­ سازی مکانیکی جهت تعیین بهترین محل برای ایستگاه­ های یک شبکه ژئودینامیکی به­ منظور رسیدن به مقادیر صحیح­ تر برای پارامترهای گسل باقابلیت اطمینان بالا و هزینه کم است به­ نحوی­ که با حل مسئله معکوس با قید مشاهدات آن ایستگاه ­ها بتوان به مقادیر صحیح ­تر برای برخی از پارامترهای گسل­ های فعال رسید. تحقیق حاضر به تعیین بهینه محل ایستگاه­ های شبکه ژئودزی ماهواره­ای برای مطالعه مکانیک گسل شمال تبریز به­ منظور برآورد هرچه صحیح ­تر پارامترهای این گسل اختصاص دارد. عوامل محدودکننده­ای نظیر توپوگرافی را نیز می­توان در این فرایند مدنظر قرار داد. به­ منظور انجام تحلیل حساسیت مدل تحلیلی اکادا (Okada) انتخاب شد و تحلیل حساسیت میدان جابه ­جایی سطحی حاصل از این مدل نسبت به کلیه پارامترهای ورودی از جمله پارامترهای هندسی گسل و پارامترهای رئولوژیکی (Rheological Parameters) پوسته انجام شد. برای انجام تحلیل از فرامدل HDMR (High Dimensional Model Representation) استفاده شد. نخست یک شبکه ­بندی 500×400 کیلومتر با فواصل نقاط 10 کیلومتری ‌در منطقه اطراف گسل ایجاد شده و تحلیل حساسیت جابه ­جایی­ های سطحی نسبت به کلیه پارامترهای ورودی مدل در هر نقطه شبکه انجام شد. بر اساس نتایج تحلیل صورت گرفته بیشترین حساسیت مدل مربوط به نرخ لغزش و عمق قفل­ شدگی و کم­ترین آن مربوط به ضرایب لامه (Lamé coefficients) می­باشد، به ­نحوی­ که برای رفتارسنجی و مطالعه نرخ لغزش ایستگاه‌ها باید دور از گسل و برای مطالعه عمق قفل‌شدگی باید نزدیک گسل احداث شوند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Determination of Appropriate Geodetic Observational regions to Monitor the Mechanical behavior of NTF by Sensitivity Analysis of Okada Model Using HDMR Method

نویسندگان [English]

  • Asghar Rastboud
  • Babak Shahandeh
  • Mehdi Mohamad-Zadeh
Civil Engineering Faculty, University of Tabriz, Tabriz, Iran
چکیده [English]

The faulting phenomenon involves different variables. Some of these variables are determined more accurately than others using non-modeling approaches. The main subject of this paper is to investigate the influence of both individual geometrical and physical input parameters involved in the Earth surface displacement models. For different physical and geometrical parameters, it is recommended to use sensitivity analysis on parameters that are determined from a field study with less accuracy. Both slip rate and locking depth of the fault are major parameters, in this aspect.
In this paper, the role of all faulting parameters on surface displacement data has been investigated. To do this analysis, the elastic half-space model of Okada (1985) was used. As a case study, the surface displacements model was applied to the North Tabriz Fault. The medium is composed of an elastic half-space. Sensitivity analysis was conducted on all geometrical and physical parameters. Finally, the regions of the most appropriate surface displacements were determined to obtain the most accurate values for the studied parameters. According to the obtained results, the model parameters, i.e., locking depth and slip rate, could be determined more effectively in the regions near and away from the fault trace, respectively.

کلیدواژه‌ها [English]

  • Sensitivity analysis
  • Mechanical Optimization
  • Geodynamic Network
  • North Tabriz Fault
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