Small subsidence of the 660‐km discontinuity beneath Japan probed by ScS reverberations
Small subsidence of the 660‐km discontinuity beneath Japan probed by ScS reverberations
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通过 ScS 混响探测日本下方 660 公里不连续面的小幅沉降
DOI：
10.1029/2000gl012109
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发表时间：
2001
影响因子：
5.2
通讯作者：
H. Kawakatsu
中科院分区：
文献类型：
--
作者：
Mamoru Kato;M. Misawa;H. Kawakatsu
我们调查的分层结构在日本下地幔最近在西北太平洋两个大的深部事件的ScS混响波形。我们估计区域变化的弹性和滞弹性结构的地幔，以及主要的速度不连续的属性，通过模拟宽带地震记录在两个密集的网络，J‐Array和FREESIA。660公里的不连续性是最深的区域，在该区域中，过渡带中的停滞俯冲板片被断层成像，但沉降量为1000公里，远小于先前对SS前兆的估计。410 km的不连续面没有检测到明显的高程。
We investigate layering structure in the mantle beneath Japan using ScS reverberation waveforms of two recent large deep events in the northwest Pacific. We estimate regional variation of the elastic and anelastic structure of the mantle as well as properties of the major velocity discontinuities by modeling broadband seismograms recorded at two dense networks, J‐Array and FREESIA. The 660‐km discontinuity is the deepest in the region where the stagnant subducting slab in the transition zone is tomographically imaged, but the subsidence is of ∼10 km, much smaller than previous estimates with SS precursors. No significant elevation is detected for the 410‐km discontinuity.