Publication Date:
2022-05-27
Description:
Author Posting. © American Geophysical Union, 2021. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 48(15), (2021): e2021GL093309, https://doi.org/10.1029/2021GL093309.
Description:
Reduction of seismic velocities has been employed to study the hydration of incoming plates and forearc mantle in recent years. However, few constraints have been obtained in the Southern Mariana Trench. We use an ocean bottom seismograph (OBS) deployment to conduct Rayleigh wave tomographic studies to derive the SV-wave velocity structure near the Southern Mariana Trench. Measured group and phase velocities as a function of period are inverted to determine the SV-wave velocity using a Bayesian Monte Carlo algorithm. The incoming Pacific Plate is characterized by low velocities (3.6–4.1 km/s) within the upper ∼25 km of the mantle near the trench, indicating extensive mantle hydration of the incoming plate in southern Mariana. The velocity reduction in the forearc mantle is not as large as in central Mariana, most likely indicating a lower forearc serpentinization in this region, which is consistent with the absence of serpentinite mud volcanoes.
Description:
This study is supported by the Hong Kong Research Grant Council Grants (No. 14304820), National Natural Science Foundation of China (Nos. 91858207, 41890813, and 91628301), Chinese Academy of Sciences (Nos. Y4SL021001, QYZDY-SSW-DQC005, 133244KYSB20180029, and COMS2019Q10), and National Key R&D Program of China (Nos. 2018YFC0309800, 2018YFC0310105, and 2018YFC0308003), Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) (No. GML2019ZD0205), Faculty of Science at CUHK.
Description:
2022-01-26
Repository Name:
Woods Hole Open Access Server
Type:
Article
