{"title":"Acoustic Emission Accompanying Nucleation of Dynamic Slip on a Model Heterogeneous Fault of Meter Scale","authors":"K. G. Morozova, D. V. Pavlov, A. A. Ostapchuk","doi":"10.1134/S106935132570020X","DOIUrl":null,"url":null,"abstract":"<p><b>Abstract</b>—Regularities in the distribution of sections with different frictional properties govern fault slip dynamics to a great extent. Since it is impossible to directly study the structure of a fault at a seismogenic depth, developing fault diagnostics methods that can yield information on structural peculiarities of the zone where an earthquake source nucleates, in addition to a specific fault dynamics, is of primary interest. This article presents results of laboratory experiments directed at studying the regularities of elastic wave emission during shear deformation of a model fault with a spatially inhomogeneous structure of the slip interface. The model fault was a loaded contact of diabase blocks 750×120 mm<sup>2</sup> in size. Two round zones, each 100 mm in diameter, were made at the interface. Those zones had high strength, showing the property of velocity weakening, so-called asperities. The relative position of asperities varied in experiments. The process of dynamic slip nucleation and emergence, caused by asperity disruption, was accompanied by emission of a large number of acoustic pulses that were recorded in the 20–80 kHz frequency range. The data on spatial distribution of pulses make it possible to detect two separate contact regions only when the distance between these regions exceeded 20 mm. Differences in the statistics of pulses emitted at different asperities were observed.</p>","PeriodicalId":602,"journal":{"name":"Izvestiya, Physics of the Solid Earth","volume":"61 2","pages":"263 - 269"},"PeriodicalIF":1.0000,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Izvestiya, Physics of the Solid Earth","FirstCategoryId":"89","ListUrlMain":"https://link.springer.com/article/10.1134/S106935132570020X","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}
引用次数: 0
Abstract—Regularities in the distribution of sections with different frictional properties govern fault slip dynamics to a great extent. Since it is impossible to directly study the structure of a fault at a seismogenic depth, developing fault diagnostics methods that can yield information on structural peculiarities of the zone where an earthquake source nucleates, in addition to a specific fault dynamics, is of primary interest. This article presents results of laboratory experiments directed at studying the regularities of elastic wave emission during shear deformation of a model fault with a spatially inhomogeneous structure of the slip interface. The model fault was a loaded contact of diabase blocks 750×120 mm2 in size. Two round zones, each 100 mm in diameter, were made at the interface. Those zones had high strength, showing the property of velocity weakening, so-called asperities. The relative position of asperities varied in experiments. The process of dynamic slip nucleation and emergence, caused by asperity disruption, was accompanied by emission of a large number of acoustic pulses that were recorded in the 20–80 kHz frequency range. The data on spatial distribution of pulses make it possible to detect two separate contact regions only when the distance between these regions exceeded 20 mm. Differences in the statistics of pulses emitted at different asperities were observed.
期刊介绍：
Izvestiya, Physics of the Solid Earth is an international peer reviewed journal that publishes results of original theoretical and experimental research in relevant areas of the physics of the Earth''s interior and applied geophysics. The journal welcomes manuscripts from all countries in the English or Russian language.
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
