کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10295079 | 512902 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Late resonant response at Wainuiomata, New Zealand, during distant earthquakes
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
مهندسی ژئوتکنیک و زمین شناسی مهندسی
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چکیده انگلیسی
Recordings of the ground motion induced by two shallow, 350Â km distant, earthquakes made on deep, soft lacustrine sediments at Wainuiomata, New Zealand, show a strong monochromatic response at around 1Â Hz, at the predicted arrival time of waves travelling from the epicentre at a group velocity of 2.7Â km/s. When an upper-crustal velocity model developed to minimise residuals of modelled earthquake wave arrivals in central New Zealand, is used to compute a dispersion curve for fundamental mode Rayleigh waves, it is seen that energy at 1Â Hz travels with a group velocity of 2.7Â km/s. Array-based studies of rock motion at Wainuiomata caused by an earthquake 80Â km away show retrograde elliptical motion during the time window corresponding to 1Â Hz fundamental mode Rayleigh waves travelling at 2.7Â km/s. This elliptical motion crosses the array at 2.7Â km/s. It is concluded that the excitation of soft soil deposits by arriving upper-crustal surface waves provides one mechanism to explain the prolonged duration of motion on soft-soils, and hence the extreme damage often associated with soft-soils responding to distant earthquakes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Soil Dynamics and Earthquake Engineering - Volume 25, Issue 3, April 2005, Pages 187-196
Journal: Soil Dynamics and Earthquake Engineering - Volume 25, Issue 3, April 2005, Pages 187-196
نویسندگان
W.R. (Bill) Stephenson,