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A Feasibility Study on Monitoring Crustal Structure Variations by Direct Comparison of Surface Wave Dispersion Curves from Ambient Seismic Noise
المؤلف
المصدر
International Journal of Geophysics
العدد
المجلد 2020، العدد 2020 (31 ديسمبر/كانون الأول 2020)، ص ص. 1-11، 11ص.
الناشر
Hindawi Publishing Corporation
تاريخ النشر
2020-02-03
دولة النشر
مصر
عدد الصفحات
11
التخصصات الرئيسية
الملخص EN
This work assesses the feasibility of the direct use of surface-wave dispersion curves from seismic ambient noise to gain insight into the crustal structure of Bransfield Strait and detect seasonal seismic velocity changes.
We cross-correlated four years of vertical component ambient noise data recorded by a seismic array in West Antarctica.
To estimate fundamental mode Rayleigh wave Green’s functions, the correlations are computed in 4-hr segments, stacked over 1-year time windows and moving windows of 3 months.
Rayleigh wave group dispersion curves are then measured on two spectral bands—primary (10–30 s) and secondary (5–10 s) microseisms—using frequency-time analysis.
We analyze the temporal evolution of seismic velocity by comparing dispersion curves for the successive annual and 3-month correlation stacks.
Our main assumption was that the Green’s functions from the cross-correlations, and thus the dispersion curves, remain invariant if the crustal structure remains unchanged.
Maximum amplitudes of secondary microseisms were observed during local winter when the Southern Ocean experiences winter storms.
The Rayleigh wave group velocity ranges between 2.1 and 3.7 km/s, considering our period range studied.
Interannual velocity variations are not much evident.
We observe a slight velocity decrease in summer and increase in winter, which could be attributed to the pressure melting of ice and an increase in ice mass, respectively.
The velocity anomalies observed within the crust and upper mantle structure correlate with the major crustal and upper mantle features known from previous studies in the area.
Our results demonstrate that the direct comparison of surface wave dispersion curves extracted from ambient noise might be a useful tool in monitoring crustal structure variations.
نمط استشهاد جمعية علماء النفس الأمريكية (APA)
Muhumuza, K.. 2020. A Feasibility Study on Monitoring Crustal Structure Variations by Direct Comparison of Surface Wave Dispersion Curves from Ambient Seismic Noise. International Journal of Geophysics،Vol. 2020, no. 2020, pp.1-11.
https://search.emarefa.net/detail/BIM-1171387
نمط استشهاد الجمعية الأمريكية للغات الحديثة (MLA)
Muhumuza, K.. A Feasibility Study on Monitoring Crustal Structure Variations by Direct Comparison of Surface Wave Dispersion Curves from Ambient Seismic Noise. International Journal of Geophysics No. 2020 (2020), pp.1-11.
https://search.emarefa.net/detail/BIM-1171387
نمط استشهاد الجمعية الطبية الأمريكية (AMA)
Muhumuza, K.. A Feasibility Study on Monitoring Crustal Structure Variations by Direct Comparison of Surface Wave Dispersion Curves from Ambient Seismic Noise. International Journal of Geophysics. 2020. Vol. 2020, no. 2020, pp.1-11.
https://search.emarefa.net/detail/BIM-1171387
نوع البيانات
مقالات
لغة النص
الإنجليزية
الملاحظات
Includes bibliographical references
رقم السجل
BIM-1171387
قاعدة معامل التأثير والاستشهادات المرجعية العربي "ارسيف Arcif"
أضخم قاعدة بيانات عربية للاستشهادات المرجعية للمجلات العلمية المحكمة الصادرة في العالم العربي
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