Crustal Structure Along Sunda-Banda Arc Transition Zone from Teleseismic Receiver Functions

IF 2 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
S. Syuhada, N. Hananto, C. I. Abdullah, N. Puspito, T. Anggono, T. Yudistira
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引用次数: 24

Abstract

We analyzed receiver function of teleseismic events recorded at twelve Indonesian-GEOFON (IA-GE) broadband stations using nonlinear Neighbourhood Algorithm (NA) inversion and H-k stacking methods to estimate crustal thickness, Vp/Vs ratios and S-wave velocity structure along Sunda-Banda arc transition zone. We observed crustal thickness of 34–37 km in Timor Island, which is consistent with the previous works. The thick crust (> 30 km) is also found beneath Sumba and Flores Islands, which might be related to the arc-continent collision causing the thickened crust. In Timor and Sumba Islands, we observed high Vp/Vs ratio (> 1.84) with low velocity zone that might be associated with the presence of mafic and ultramafic materials and fluid filled fracture zone. The high Vp/Vs ratio observed at Sumbawa and Flores volcanic Islands might be an indication of partial melt related to the upwelling of hot asthenosphere material through the subducted slab.
从远震接收函数看巽他-班达弧过渡带的地壳结构
利用非线性邻域算法(NA)反演和H-k叠加方法,分析了12个印度尼西亚- geofon (IA-GE)宽带台站记录的远震事件接收函数,估算了巽他-班达弧过渡带的地壳厚度、Vp/Vs比和s波速度结构。我们在帝汶岛观测到的地壳厚度为34 ~ 37 km,与前人的研究结果一致。在松巴岛和弗洛雷斯岛也发现了厚地壳(bbb30 km),这可能与弧-陆碰撞导致地壳增厚有关。在Timor和Sumba群岛,我们观察到高Vp/Vs比(> 1.84)和低速带,可能与基性和超基性物质的存在以及充满流体的裂缝带有关。在松巴哇和弗洛雷斯火山岛观测到的高Vp/Vs比值可能表明与热软流圈物质通过俯冲板块上涌有关的部分熔融。
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来源期刊
Acta Geophysica
Acta Geophysica 地学-地球化学与地球物理
CiteScore
3.90
自引率
13.00%
发文量
251
审稿时长
5.3 months
期刊介绍: Acta Geophysica is open to all kinds of manuscripts including research and review articles, short communications, comments to published papers, letters to the Editor as well as book reviews. Some of the issues are fully devoted to particular topics; we do encourage proposals for such topical issues. We accept submissions from scientists world-wide, offering high scientific and editorial standard and comprehensive treatment of the discussed topics.
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