کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4741347 1641485 2016 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Small-aperture-array translational and rotational seismograms from distant sources – An example of the Jan Mayen Mw 6.8 of 30 August 2012 earthquake
ترجمه فارسی عنوان
لرزه نگاری حرکتی و چرخشی کوچک از دیافراگم آرایه از منابع دور - نمونه ای از May Mayen M8 6.8 از 30 اوت 2012 زمین لرزه
کلمات کلیدی
چرخش لرزه ای؛ حسی واقعی سرعت فیزیکی لرزه ای ظاهری؛ پراکندگی موج Rayleigh
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فیزیک زمین (ژئو فیزیک)
چکیده انگلیسی


• The true backazimuth of a seismic wave estimated minimizing the radial-axis tilt rate.
• The phase velocity retrieved by matching transverse tilt rate and vertical acceleration.
• Collocated translational and rotational data enable to determine Rayleigh-wave dispersion.

We present the seismic rotation rate due to the earthquake of Mw 6.7 at the Jan Mayen island, obtained from broad-band seismograms at a distance of about 2740 km. The order of magnitude of the rotation rate amplitude is only 10−9 rad/s in this case. It is studied with a focus on rotation-to-translation relations. A joint analysis of the rotational and translational data allowed us to determine the true backazimuth and phase velocity of S- and Rayleigh waves. For the surface waves, we studied the frequency dependence of both the backazimuth and phase velocity (wave dispersion). The results are independently confirmed by a method based on time delays between translational records within a small-aperture array. Both methods revealed an unusual velocity drop in the dispersion curve between the periods of 18 and 22 s. This feature may be an indication of a low-velocity zone in the lower crust.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics of the Earth and Planetary Interiors - Volume 256, July 2016, Pages 1–12
نویسندگان
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