Gouge stability controlled by temperature elevation and obsidian addition in basaltic faults and implications for moonquakes

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外文摘要：Basalt is a major component of the earth and moon crust.Mineral composition and temperature influence frictional instability and thus the potential for seismicity on basaltic faults.We performed velocity-stepping shear experiments on basalt gouges at a confining pressure of 100 MPa,temperatures in the range of 100-400 °C and with varied obsidian mass fractions of 0-100%under wet/dry conditions to investigate the frictional strength and stability of basaltic faults.We observe a transition from velocity-neutral to velocity-weakening behaviors with increasing obsidian content.The frictional stabil-ity response of the mixed obsidian/basalt gouges is characterized by a transition from velocity-strengthening to velocity-weakening at 200°C and another transition to velocity-strengthening at tem-peratures>300°C.Conversely,frictional strengths of the obsidian-bearing gouges are insensitive to tem-perature and wet/dry conditions.These results suggest that obsidian content dominates the potential seismic response of basaltic faults with the effect of temperature controlling the range of seismogenic depths.Thus,shallow moonquakes tend to occur in the lower lunar crust due to the corresponding antic-ipated higher glass content and a projected temperature range conducive to velocity-weakening behav-ior.These observations contribute to a better understanding of the nucleation mechanism of shallow seismicity in basaltic faults.

外文关键词：

Fault stabilityBasaltic faultTemperature elevationObsidian contentShallow moonquakes

作者：

Shutian Cao、Fengshou Zhang、Mengke An、Derek Elsworth、Manchao He、Hai Liu、Luanxiao Zhao

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作者单位：

Department of Geotechnical Engineering,College of Civil Engineering,Tongji University,Shanghai 200092,China

Key Laboratory of Geotechnical&Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China

Department of Energy and Mineral Engineering,EMS Energy Institute and G3 Center,The Pennsylvania State University,University Park,PA 16802,USA

Department of Geosciences,The Pennsylvania State University,University Park,PA 16802,USA

State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China

School of Civil Engineering,Guangzhou University,Guangzhou 510006,China

School of Ocean and Earth Sciences,Tongji University,Shanghai 200092,China

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基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaFundamental Research Funds for the Central Universities

项目编号：

4232010400342107163

出版年：

2024

DOI：

10.1016/j.ijmst.2024.04.012

矿业科学技术学报(英文版)

中国矿业大学

矿业科学技术学报(英文版)

CSTPCDEI

影响因子：1.222

ISSN：2095-2686

年,卷(期)：2024.34(9)