Microearthquake reveals the lithospheric structure at mid-ocean ridges and oceanic transform faults

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外文摘要：Mid-ocean ridge and oceanic transforms are among the most prominent features on the seafloor surface and are crucial for understanding seafloor spreading and plate tectonic dynamics,but the deep structure of the oceanic lithosphere remains poorly understood.The large number of microearthquakes occurring along ridges and transforms provide valuable information for gaining an in-depth view of the underlying detailed seismic structures,contributing to understanding geodynamic processes within the oceanic lithosphere.Previous studies have indicated that the maximum depth of microseismicity is controlled by the 600-℃ isotherm.However,this perspective is being challenged due to increasing observations of deep earthquakes that far exceed this suggested isotherm along mid-ocean ridges and oceanic transform faults.Several mechanisms have been proposed to explain these deep events,and we suggest that local geodynamic processes(e.g.,magma supply,mylonite shear zone,long-lived faults,hydrothermal vents,etc.)likely play a more important role than previously thought.

外文关键词：

microearthquakemid-ocean ridgeoceanic transform faultoceanic lithospherethermal structureearthquake location

作者：

Zhiteng YU、Jiabiao LI、Weiwei DING

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作者单位：

Key Laboratory of Submarine Geosciences & Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,China

基金：

国家自然科学基金重点项目Project of Donghai LaboratoryScientific Research Fund of the Second Institute of Oceanography,Ministry of Natural Resources国家杰出青年科学基金国家自然科学基金青年基金浙江省自然科学基金

项目编号：

42330308DH-2022ZY0005QHXZ23014202560141906064LDQ24D060001

出版年：

2024

DOI：

10.1007/s00343-024-3246-2

海洋湖沼学报(英文版)

中国海洋湖沼学会

海洋湖沼学报(英文版)

CSTPCD

影响因子：0.386

ISSN：2096-5508

年,卷(期)：2024.42(3)