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首页> 外文会议>European Association of Geoscientists Engineers Conference Exhibition >Variation of the Crustal Structure Along the Juan de Fuca Ridge from Gravity and Seismic Data
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Variation of the Crustal Structure Along the Juan de Fuca Ridge from Gravity and Seismic Data

机译：从重力和地震数据的Juan de Fuca脊的地壳结构的变化

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Variations in axial topography and crustal structure are observed along the Juan de Fuca Ridge (JdFR). They may reflect spatial variations in mantle melt supply and delivery of the melt to the crust together with temporal changes, possibly linked to interaction with nearby melt anomalies/hotspots. Here we analyze gravity and multi-channel seismic (MCS) data at the JdFR in order to gain a better understanding of the possible sources for the crustal structure variation in this area. Gravity models for the propagator s wakes show presence of thinner and probably denser crust that we attribute to the presence of FeTi basalts. In difference, on the younger crust side of the wakes the models show presence of thicker crust at the extent of ～10 km from the wake. The anomalously greater twtt to Moho within the axial region is explained by the presence of thicker crust. Since thickening of the crust and gradual changes of densities within the layer 2b/3 due to the half plate thermal cooling account for less than 60% of the observed anomaly, the remaining ～40% of the anomaly we attribute to the presence of low density body below the crust.
机译：沿着Juan de Fuca Ridge（JDFR）观察轴向形貌和地壳结构的变化。它们可能反映了地幔熔体供应的空间变化和将熔体输送到地壳，与颞叶的时间变化相连，可能与与附近的熔体异常/热点相互作用。在这里，我们在JDFR分析了重力和多通道地震（MCS）数据，以便更好地理解该区域的地壳结构变化的可能源。传播者的重力模型显示出较薄的存在，并且可能归因于我们归属于FETI玄武岩的存在。有区别，在醒来的较年轻的地壳方面，模型在醒来左右的程度上显示出厚壳的存在。通过厚壳的存在解释轴向区域内的异常更大的TWTT至轴向区域内的MOHO。由于由于半板热冷却占观察异常的半板热冷却占60％，因此剩余〜40％的异常〜40％的归因于低密度的剩余〜40％地壳下方的身体。

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