کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6439788 | 1638318 | 2015 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Helicopter vs. volcanic tremor: Characteristic features of seismic harmonic tremor on volcanoes
ترجمه فارسی عنوان
هلیکوپتر در مقابل لرزه آتشفشانی: ویژگی های مشخصه لرزه هارمونیک لرزه ای در آتشفشان
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کلمات کلیدی
فرکانس پرواز تغییر داپلر، لرزش هارمونیک، هلی کوپتر، آتشفشان،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
چکیده انگلیسی
We recorded high-frequency (>Â 10Â Hz) harmonic tremor with spectral gliding at Hekla Volcano in Iceland. Particle motion plots indicated a shallow tremor source. We observed up to two overtones beneath our Nyquist frequency of 50Â Hz and could resolve a source of closely spaced pulses of very short duration (0.03-0.1Â s) on zoomed seismograms. Volcanic tremor with fundamental frequencies above 5Â Hz, frequency gliding and/or repetitive sources similar to our observations were observed on different volcanoes around the world. However, this frequency content, duration and occurrence of volcano-related tremor was not observed in the last 35Â years of seismic observations at Hekla. Detailed analysis reveals that this tremor was related to helicopters passing the volcano. This study relates the GPS track of a helicopter with seismic recordings of the helicopter at various distances. We show the effect the distance, number of rotor blades and velocity of the helicopter has on the observed up and down glidings at up to 40Â km distance. We highlight similarities and differences between volcano-related and helicopter tremor in order to help avoid misinterpretations.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Volcanology and Geothermal Research - Volume 304, 1 October 2015, Pages 108-117
Journal: Journal of Volcanology and Geothermal Research - Volume 304, 1 October 2015, Pages 108-117
نویسندگان
Eva P.S. Eibl, Ivan Lokmer, Christopher J. Bean, Eggert Akerlie, KristÃn S. Vogfjörd,