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Numerical Study on the Characteristics of Abyssal T-wave Envelopes Controlled by Earthquake Source Parameters

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Title
Numerical Study on the Characteristics of Abyssal T-wave Envelopes Controlled by Earthquake Source Parameters
Other Titles
수치모델을 이용한 지진원 매개변수가 심해저 T파 포락선 특성에 미치는 영향 연구
Authors
Yun, Sukyoung
Lee, Won Sang
Dziak, Robert P.
Matsumoto, Haruyoshi
Subject
Geochemistry & Geophysics
Keywords
SEISMICITYSCATTERINGVOLCANOPHASEMAGNITUDESGENERATIONEXCITATIONSPECTRAEVENTRIDGE
Issue Date
2022-07
Citation
Yun, Sukyoung, et al. 2022. "Numerical Study on the Characteristics of Abyssal T-wave Envelopes Controlled by Earthquake Source Parameters". SEISMOLOGICAL RESEARCH LETTERS, 93(4): 2189-2200.
Abstract
Hydroacoustics has been successfully applied to detect and locate small to intermediate submarine tectonic activities infrequently recorded in land-based seismic arrays. However, to extend the utilization of T-waves to extract other important earthquake source parameters, such as source strength, the roles of earthquake focal mechanisms and source depths in T-wave envelopes must be thoroughly understood. We performed 3-D numerical modeling considering anisotropic source radiation and realistic scattering in the oceanic crust for two focal mechanisms (normal and strike-slip faults) and three depths (5, 10, and 15 km) to investigate the effect of source radiation and focal depth on abyssal T-waves. By analyzing the synthetic Twave envelopes, we showed that stronger SV-energy radiation from a normal-fault earthquake event generates higher-intensity T-waves of the same source magnitude. The anisotropic source radiation of a double-couple source causes azimuthal changes in the shapes of T-waves, and deeper earthquakes cause gentle sloped envelopes; however, the slopes also vary with respect to the azimuths of receivers and focal mechanisms. Temporal changes in the slopes of T-wave envelopes of magmatic swarm events near Wordie Volcano, Bransfield Strait, Antarctic Peninsula, imply that the depth dependency can be utilized to determine relative depths for hydrothermal-vent events or sequenced earthquakes.
URI
https://repository.kopri.re.kr/handle/201206/13568
DOI
http://dx.doi.org/10.1785/0220210264
Type
Article
Station
기타(극지연구소 남극 브랜스필드 수중음향 관측망 자료 활용 연구)
Indexed
SCIE
Appears in Collections  
2021-2022, Land-Ice/Ocean Network Exploration with Semiautonomous Systems: Thwaites Glacier (LIONESS/TG) - Toward understanding the fate of the Thwaites Glacier by abrupt collapse and its impact on global sea level changes - (21-22) / Lee, Won Sang (PM21020)
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