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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >High temperature anomalies oceanward of subducting slabs at the 410-km discontinuity
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High temperature anomalies oceanward of subducting slabs at the 410-km discontinuity

机译：410 km不连续处俯冲板块向海的高温异常

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摘要

Our P-wave whole mantle tomography revealed a low velocity region oceanward of the Northern Honshu slab of the Pacific plate at depths around the 410-km seismic discontinuity. Resolution tests and scrutiny of the traveltime residuals for the ray paths passing through the low velocity region indicate that this anomaly is a resolvable feature and not an artifact due to the strong slab anomalies. The existence of the slow anomalies is also supported by the analysis of the P-wave records from the J-array (a large-aperture seismic array in Japan) for a Bonin earthquake. The P arrivals to Northern Honshu (at epicentral distances of 13-20 degrees) are strongly triplicated be, cause of the 410-km discontinuity. The later arrivals along the retrograde branch, where ray paths pass through the low velocity region, are anomalously slow. Comparison of the observed and synthetic waveforms indicates not only slow anomalies but also depression of the 410-km discontinuity. This depression represents the direct evidence for the low velocity zone of primarily thermal origin. An excess temperature of 200 K and the associated fractional melt of less than 1% can explain both the results of the tomographic and waveform analyses. (c) 2006 Elsevier B.V All rights reserved.
机译：我们的P波全幔层析成像显示了太平洋板块北本州板块向海的低速区域，位于410公里地震非连续性附近。分辨率测试和对通过低速区域的光线路径的传播时间残差的仔细检查表明，由于强烈的平板异常，这种异常是可解决的特征，而不是伪影。通过分析波宁地震的J阵列（日本大孔径地震阵列）的P波记录也支持了慢速异常的存在。到达本州北部（震中距13-20度）的P值一式三份，原因是410 km不连续。沿逆行分支的后期到达异常缓慢，那里的射线路径穿过低速区域。观察到的波形和合成波形的比较不仅表明异常缓慢，而且还表明410 km不连续性的降低。该凹陷代表主要是热源的低速带的直接证据。 200 K的过高温度和相关的熔融分数小于1％可以解释断层扫描和波形分析的结果。 （c）2006 Elsevier B.V保留所有权利。

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