A hot midmantle anomaly in the area of the Indian Ocean Geoid Low
A hot midmantle anomaly in the area of the Indian Ocean Geoid Low
复制标题
印度洋大地水准面低压区的中地幔热异常
DOI:
10.1002/2017gl073440
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发表时间:
--
影响因子:
5.2
通讯作者:
B. Heyn
中科院分区:
文献类型:
--
作者:
C. Thomas;J. van Driel;B. Heyn
We investigate the upper mantle seismic discontinuities at 410 and 660 km depth beneath the Indian Ocean Geoid Low (IOGL). To map the discontinuities' topography, we use differential travel times ofPPandSSwaves and their precursors. Our final data set consists of 37 events withMw≥ 5.8, which densely cover our investigation area, also with crossing ray paths. We use array methods to detect the low‐amplitude precursor signals. The best quality data show a deepened 410 km discontinuity in the center of the IOGL as well as a mostly elevated 660 km discontinuity beneath the northern Indian Ocean, which we interpret as a hot anomaly currently residing in the mantle transition zone. We conclude that the largest negative geoid anomaly might be caused by a combined effect of hot material in the midmantle below the innermost IOGL and cold material below 660 km farther south.
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