Cross-Correlation Analysis of Long-Term Ambient Seismic-Noise Recordings in the Caribbean Netherlands to Monitor the Volcanoes on Saba and St. Eustatius
被引:6
作者:
Sleeman, Reinoud
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机构:
KNMI, De Bilt, NetherlandsKNMI, De Bilt, Netherlands
Sleeman, Reinoud
[1
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de Zeeuw-van Dalfsen, Elske
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机构:
KNMI, De Bilt, NetherlandsKNMI, De Bilt, Netherlands
The continuous recordings of broadband seismometers on Saba and St. Eustatius in the Lesser Antilles provide a unique and long data set to measure temporal seismic velocity variations (dv/v) at two active but quiescent volcanoes (Mt. Scenery and The Quill). We compare results from single-station cross-component (SC) correlations with cross-station cross-component (CC) correlations and achieve the best similarities within the frequency band 1.3-2.1 Hz, with average correlations of 0.82 for Saba and 0.36 for St. Eustatius, justifying the use of SC as proxy for CC at these frequencies. Temporal dv/v variations derived from 13 yr of data show different characteristics at both islands. At St. Eustatius dv/v highly correlates (0.72) with air temperature and can be modeled by a simple sine wave with a period of 1 yr. Remaining residuals reveal cohurricane dv/v drops, thus at times of the passage of a hurricane. At Saba, subsurface velocity variations show temporal coseismic changes, up to -0.49% compared with -0.19% at St. Eustatius, and thus show a higher sensitivity to ground shaking. Our data set, although limited, shows a linear relation (correlation 0.78) between the coseismic dv/v drop and peak ground velocity at Saba around 1.3 Hz. We model the associated seismic velocity recovery with an exponential decay function and we estimate the recovery time at 2 yr. After subtracting the coseismic drop and recovery model, dv/v at Saba obtained from CC data correlates with the sine model (correlation 0.71). SC may be an appealing alternative for CC for monitoring purposes; however, the use of a small network is preferred to reduce the variance in dv/v (at St. Eustatius from 0.12% to 0.05%) and to detect dv/v variations unrelated to volcanic activity (e.g., hurricane). We continue work on the implementation of CC in the daily monitoring for Mt. Scenery and The Quill.
机构:
Univ Hawaii Manoa, Dept Geol & Geophys, Honolulu, HI 96822 USAUniv Hawaii Manoa, Dept Geol & Geophys, Honolulu, HI 96822 USA
Ballmer, Silke
Wolfe, Cecily J.
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机构:
Univ Hawaii Manoa, Hawaii Inst Geophys & Planetol, Honolulu, HI 96822 USA
USGS, Earthquake Hazards Program, Reston, VA 20192 USAUniv Hawaii Manoa, Dept Geol & Geophys, Honolulu, HI 96822 USA
Wolfe, Cecily J.
Okubo, Paul G.
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机构:
USGS, Hawaiian Volcano Observ, Hawaii Natl Pk, HI 96718 USAUniv Hawaii Manoa, Dept Geol & Geophys, Honolulu, HI 96822 USA
Okubo, Paul G.
Haney, Matthew M.
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机构:
USGS, Alaska Volcano Observ, Anchorage, AK 99508 USAUniv Hawaii Manoa, Dept Geol & Geophys, Honolulu, HI 96822 USA
Haney, Matthew M.
Thurber, Clifford H.
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机构:
Univ Wisconsin, Dept Geosci, Madison, WI 53706 USAUniv Hawaii Manoa, Dept Geol & Geophys, Honolulu, HI 96822 USA
机构:
Badan Geol, Jalan Diponegoro 57, Bandung 40122, Indonesia
Univ Savoie Mt Blanc, CNRS, ISTerre, IRD 219, F-73376 Le Bourget Du Lac, FranceBadan Geol, Jalan Diponegoro 57, Bandung 40122, Indonesia
Budi-Santoso, Agus
Lesage, Philippe
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机构:
Univ Savoie Mt Blanc, CNRS, ISTerre, IRD 219, F-73376 Le Bourget Du Lac, FranceBadan Geol, Jalan Diponegoro 57, Bandung 40122, Indonesia
机构:
Univ Hawaii Manoa, Dept Geol & Geophys, Honolulu, HI 96822 USAUniv Hawaii Manoa, Dept Geol & Geophys, Honolulu, HI 96822 USA
Ballmer, Silke
Wolfe, Cecily J.
论文数: 0引用数: 0
h-index: 0
机构:
Univ Hawaii Manoa, Hawaii Inst Geophys & Planetol, Honolulu, HI 96822 USA
USGS, Earthquake Hazards Program, Reston, VA 20192 USAUniv Hawaii Manoa, Dept Geol & Geophys, Honolulu, HI 96822 USA
Wolfe, Cecily J.
Okubo, Paul G.
论文数: 0引用数: 0
h-index: 0
机构:
USGS, Hawaiian Volcano Observ, Hawaii Natl Pk, HI 96718 USAUniv Hawaii Manoa, Dept Geol & Geophys, Honolulu, HI 96822 USA
Okubo, Paul G.
Haney, Matthew M.
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h-index: 0
机构:
USGS, Alaska Volcano Observ, Anchorage, AK 99508 USAUniv Hawaii Manoa, Dept Geol & Geophys, Honolulu, HI 96822 USA
Haney, Matthew M.
Thurber, Clifford H.
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h-index: 0
机构:
Univ Wisconsin, Dept Geosci, Madison, WI 53706 USAUniv Hawaii Manoa, Dept Geol & Geophys, Honolulu, HI 96822 USA
机构:
Badan Geol, Jalan Diponegoro 57, Bandung 40122, Indonesia
Univ Savoie Mt Blanc, CNRS, ISTerre, IRD 219, F-73376 Le Bourget Du Lac, FranceBadan Geol, Jalan Diponegoro 57, Bandung 40122, Indonesia
Budi-Santoso, Agus
Lesage, Philippe
论文数: 0引用数: 0
h-index: 0
机构:
Univ Savoie Mt Blanc, CNRS, ISTerre, IRD 219, F-73376 Le Bourget Du Lac, FranceBadan Geol, Jalan Diponegoro 57, Bandung 40122, Indonesia