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فیلترکردن دادههای خرد لرزهای با تکنیک کاهش مصنوعی فرکانس نمونهبرداری برای تخمین بسامد آبرفتهای بنیادی و عمق سنگ بستر مهندسی | ||
فیزیک زمین و فضا | ||
مقاله 2، دوره 51، شماره 1، خرداد 1404، صفحه 17-43 اصل مقاله (2.15 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/jesphys.2025.382590.1007628 | ||
نویسندگان | ||
احمد ادیب* 1؛ سید محمد موسوی انزهایی2؛ پوریا کیانوش1 | ||
1گروه مهندسی نفت و معدن، واحد تهران جنوب، دانشگاه آزاد اسلامی، تهران، ایران. | ||
2گروه مهندسی برق، واحد تهران جنوب، دانشگاه آزاد اسلامی، تهران، ایران. | ||
چکیده | ||
کیفیت اندازهگیری و روش پردازش خردلرزهها تأثیر قابلتوجهی بر دقت تخمین پارامترهای دینامیکی ساختگاه دارد. در این مقاله، بهمنظور افزایش دقت تخمین فرکانس غالب آبرفت، از تکنیک کاهش مصنوعی فرکانس نمونهبرداری و روش واریانس پیشرونده استفاده شده است. این روشها بهویژه در مناطق شهری که تحتتأثیر اختلالات محلی قرار دارند، میتوانند بهطور مؤثری نویزهای اضافی را حذف کرده و دقت تخمین را افزایش دهند. با استفاده از پنجره لغزان، واریانس پیشرونده سیگنال محاسبه و از آن بهعنوان پایهای برای حذف محدوده دادههایی که تحتتأثیر اختلالات گذرا قرار گرفتهاند، استفاده میشود. نتایج حاصل از اعمال این روشها بر روی دادههای خردلرزهای ثبت شده در شهر میبد، نشاندهنده عملکرد مؤثر این تکنیکها در حذف اثر اختلالات محلی و بهبود دقت تخمین فرکانس غالب آبرفت است. این مطالعه نشان میدهد که با تغییراتی در روش پردازش دادهها، میتوان بهطور قابلتوجهی از اثرات مخرب اختلالات محلی کاست و فرکانس غالب زمین را با دقت بیشتری تعیین کرد. با توجه به اقتصادی بودن این روش، تحلیل خردلرزهها میتواند بهعنوان یک روش پایهای در مطالعات اولیه ژئوتکنیکی در مناطق مختلف مورد استفاده قرار گیرد. | ||
کلیدواژهها | ||
خردلرزهها؛ فرکانس غالب آبرفت؛ تکنیک کاهش مصنوعی فرکانس نمونهبرداری؛ روش واریانس پیشرونده؛ حذف اغتشاش | ||
مراجع | ||
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