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Trench-normal seismic anisotropy generated by lawsonite eclogites from the southern Motagua fault zone, Guatemala

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Title
Trench-normal seismic anisotropy generated by lawsonite eclogites from the southern Motagua fault zone, Guatemala
Other Titles
과테말라 남 모타구아 전단대에서 채취한 로소나이트 에클로자이트를 이용해 계산한 지진파 이등방성의 특성
Authors
Kim, Daeyeong
Rhee, Jin-Han
Shunsuke Endo
Wallis, Simon
Keywords
EBSD; Lawsonite Eclogite; Sesimic anisotropy
Issue Date
2016
Citation
Kim, Daeyeong, et al. 2016. Trench-normal seismic anisotropy generated by lawsonite eclogites from the southern Motagua fault zone, Guatemala. 2016년 한국암석학회, 한국광물학회 공동학술발표회. 부산대학교 상남국제회관. 2016.05.26~2016.05.27.
Abstract
We present the results of EBSD analyses on extremely fresh lawsonite eclogites from southern Motagua fault zone, Guatemala for understanding seismic properties of subducting oceanic crust. The CPO of omphacite is characterized by (010)[001] with AVS of 1.4-2.7%, whereas that of lawsonite defined by (001)[010] with 3.4-14.7% AVS. The seismic anisotropy of lawsonite eclogite is calculated as 1.2-4.1% AVP and 1.8-6.8% AVS. Based on an assumption of the high modal abundance and strong fabric of lawsonite, the AVS of eclogite is estimated as ~11.7% in the case of 75% lawsonite and 25% omphacite. For events that propagate more or less parallel to the maximum extension direction, X, the fast S-wave velocity (VS) causing trench-normal seismic anisotropy for orthogonal subduction. Our study suggests that lawsonite in both blueschist and eclogite may play the key role in the formation of complex pattern of seismic anisotropy observed in NE Japan: weak trench-parallel in the forearc basin and trench-normal in the backarc. * Main contents of this study has been published in Tectonophysics (2016, vol 677-678, 88-98, doi: 10.1016/j.tecto.2016.04.012).
URI
http://repository.kopri.re.kr/handle/201206/8332
Conference Name
2016년 한국암석학회, 한국광물학회 공동학술발표회
Conference Place
부산대학교 상남국제회관
Conference Date
2016.05.26~2016.05.27
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