ارزیابی نیاز به ریزپهنه‌بندی لرزه‌ای در شهرستان بناب براساس ملاحظات منطقه‌ای و تحلیل احتمالی خطر زلزله از مجاورت دریاچۀ ارومیه تا دامنۀ کوه سهند

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

1 گروه عمران، دانشکدۀ فنی و مهندسی، دانشگاه بناب

2 پژوهشکده ساختمان و مسکن، مرکز تحقیقات راه و مسکن و شهرسازی

3 دانشکده تحصیلات تکمیلی محیط زیست، دانشگاه تهران

چکیده

ریزپهنه­بندی لرزه­ای شهرستان بناب با مختصات مرکزی N3403°/37 و E0561°/46 از طریق انجام تحلیل احتمالی خطر زلزله در محدوده­ای به شعاع 150 کیلومتر از مرکز شهر و اعمال تأثیرات شرایط ساختگاهی از مجاورت دریاچه ارومیه تا دامنه کوه­های سهند نیازسنجی گردیده است. به این منظور، اطلاعات لرزه­ای و مهلرزه­ای منطقه بررسی شده­اند. تحلیل­های آماری پس از یکسان­سازی داده­ها انجام و عمق سایزموژنیک منطقه بر اساس فراوانی زلزله­ها تعیین شده است. چشمه­های لرزه­ای با مطالعه گسل­های فعال منطقه و نیز زلزله­های روی داده در آن شناسایی شده­اند. توان لرزه­ای چشمه­ها محاسبه و پارامترهای لرزه­ای به کمک نرم­افزارهای Zmap و Kijko به­ترتیب با دو روش Gutenberg-Richter و Kijko-Sellevoll تعیین گردیده­اند. تحلیل خطر با استفاده از نرم­افزار EZ-FRISK برای دوره­های بازگشت 10، 475، 975 و 2475 سال انجام و شتاب­های حداکثر سنگ بستر در این دوره­های بازگشت به­دست آمده­اند. عوامل ژئوتکنیک و توپوگرافی منطقه بررسی و تأثیرات آن­ها در شتاب زمین ارزیابی شده­اند. بر اساس نتایج، بیشینه شتاب سنگ بستر در منطقه تقریباً به طور ثابت g035/0 برای زلزله­های با احتمال فراگذشت %5/99 در 50 سال، g21/0 برای زلزله­های با احتمال فراگذشت %10 در 50 سال، g28/0 برای زلزله­های با احتمال فراگذشت %5 در 50 سال و g39/0 برای زلزله­های با احتمال فراگذشت %2 در 50 سال به­دست آمده­اند. شتاب مبنای ویرایش چهارم استاندارد 2800 با توجه به مطالعات لرزه­ای جدید هم مورد قبول ارزیابی گردیده، ریز­پهنه­بندی لرزه­ای به علت تغییرات بارز شتاب زمین در اثر اعمال ملاحظات ژئوتکنیک و توپوگرافی منطقه مورد نیاز تشخیص داده شده و 6 ریزپهنه پیشنهاد شده­اند.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of the Need for Seismic Microzonation in Bonab County based on Regional Considerations and Probabilistic Earthquake Hazard Analysis from the Vicinity of Urmia Lake toward the Hillsides of Sahand Mountain

نویسندگان [English]

  • Peyman Narjabadifam 1
  • Iraj Chaei-Asl-Tabrizi 2
  • Mina Bagheri-Mollahajlu 3
1 Department of Civil Engineering, Faculty of Engineering, University of Bonab, 5551761167 Bonab, Iran
2 Building and Housing Department, BHRC, 1463917151, Tehran, Iran
3 Postgraduate School of Environmental Engineering, University of Tehran, 14155-6135, Tehran, Iran
چکیده [English]

Earthquake can be considered as the most important environmental excitation because of its massive destructivity within a short period of time. Prediction of earthquakes is still a dilemma (Wang, 2015). The questions are also available about the effectiveness of prediction, if possible. It is clear that the society will not be safe with only the prediction of earthquakes. Earthquake protection of structures is required as the main solution. The quality of this protection depends mainly on the quality of the estimation of possible earthquakes. In this regard, earthquake hazard analysis should be followed by seismic microzonation in order to account for the site effects. Evaluation of the need for such a detailed study is carried out for Bonab County, which is the second industrial city in the province of East Azerbaijan after the capital city (Tabriz), being also important because of its cultural heritage. The other motivation for this study comes from the change in the seismicity of the neighboring region referred to the 4th edition of the Iranian code of practice for seismic resistant design of buildings (Standard No. 2800) when compared with the 3rd edition of this standard (PCIRC, 2007).

کلیدواژه‌ها [English]

  • Seismic microzonation
  • Earthquake hazard analysis
  • Probabilistic method
  • Zmap
  • Kijko
  • EZ-FRISK

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