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首页> 外文期刊>Geoscience journal >Structural records and mechanical characteristics of seismic slip along an active fault crosscutting unconsolidated Quaternary sediments: Suryum fault, SE Korea
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Structural records and mechanical characteristics of seismic slip along an active fault crosscutting unconsolidated Quaternary sediments: Suryum fault, SE Korea

机译：沿积极断路器跨越季度沉积物的结构记录和地震滑动的机械特性：SURYUM FAURT，SE韩国

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摘要

The Suryum fault is an active fault in southeast Korea crosscutting the Quaternary sediment deposit. We conducted outcrop-scale to microscale observations of the fault slip zone and performed shear experiments on the fault gouge at subseismic (3-30 mu m/s) and seismic slip rates (0.53 m/s). The gouge is rich in clay minerals (> 58%), particularly in expandable clay minerals (40%). In the gouge zone, a very narrow (20-150 mu m thick) principal slip zone (PSZ), identified by the strong alignment of clay minerals, was developed. At several places along the fault, the gouge is observed to have been injected into the Quaternary wallrock sediments. The development of the narrow PSZ is incompatible with the velocity-strengthening behavior of the Suryum fault gouge observed in the shear tests, and it may indicate that seismic rupture could be propagated along the PSZ in the clay-rich gouge. Slip localization into the PSZ was presumably possible because of significant dynamic fault weakening due to thermal pressurization (or buildup of pore pressure caused by frictional heating) in the low-permeability clay gouge during fast slip. The gouge injections along the Suryum fault may be the geological record of gouge fluidization caused by thermal pressurization. This idea is supported by observations of very low friction of the Suryum fault gouge when sheared experimentally at the seismic slip rate and of the gouge injections in the sheared gouge. The dynamic weakness of the Suryum fault implies that large displacement and low-frequency ground motion at near-surface depths would be possible when it is reactivated.
机译：苏里姆故障是韩国东南跨越季泥浆沉积物的积极故障。我们对故障流带的微观观察进行了俯视尺度，并在底底（3-30μm/ s）和地震滑动速率（0.53米/秒）上进行了剪切实验。胭脂矿物质含量富含粘土矿物质（> 58％），特别是在可扩展的粘土矿物质（40％）中。在凿沟区中，开发了由粘土矿物质的强对准鉴定的非常窄（20-150μm厚）主体滑区（PSZ）。在沿着故障的几个地方，观察到凿子被注射到季墙衣物沉积物中。窄PSZ的发展与在剪切试验中观察到的Suryum故障罩的速度 - 强化行为不相容，并且可能表明抗岩石凿孔中的PSZ可以繁殖地震破裂。可能是由于在快速滑动期间低渗透率粘土凿孔中的热加压（或由摩擦加热引起的孔隙压力累积）而显着的动态故障削弱了PSZ的滑移定位。沿着Suryum Fault的胭脂注射可能是由热加压引起的凿子流化的地质记录。在通过在抗震滑动速率和剪切凿孔中的碎屑喷射的情况下，通过在实验剪切时对Suryum故障凿孔的非常低摩擦的观察来支持这种想法。 Suryum断层的动态弱点意味着当它被重新激活时，可以在近表面深度处的大量位移和低频接地运动。

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