Magnitude distribution during phase transformation faulting: Implication for deep-focus earthquakes

Magnitude distribution during phase transformation faulting: Implication for deep-focus earthquakes | Authorea try { document.documentElement.classList.add('js'); } catch (e) { } var _gaq = _gaq || []; _gaq.push(['_setAccount', 'G-8VDV14Y67G']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); Skip to main content Preprints Collections Wiley Open Research IET Open Research Ecological Society of Japan All Collections About About Authorea FAQs Contact Us Quick Search anywhere Search for preprint articles, keywords, etc. Search Search ADVANCED SEARCH SCROLL This is a preprint and has not been peer reviewed. Data may be preliminary. 31 July 2024 V1 Latest version Share on Magnitude distribution during phase transformation faulting: Implication for deep-focus earthquakes Authors : Sando Sawa 0000-0002-3645-9505 [email protected] , Julien Gasc , Nobuyoshi Miyajima 0000-0002-6226-5675 , Alexandre Schubnel , Marie Baïsset 0000-0001-5611-5470 , and Jun Muto 0000-0001-8493-4051 Authors Info & Affiliations https://doi.org/10.22541/au.172243928.81251816/v1 345 views 166 downloads Contents Abstract Supplementary Material Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract Deep-focus earthquakes occur at 300-660 km depth. Geophysical observations and deformation experiments propose the olivine-spinel (wadsleyite/ringwoodite) phase transformation as the faulting mechanism. While geophysical observations indicate that fault geometry influences the b values in the Gutenberg-Richter law for the phase transformation faulting, deformation experiments reveal that b values are also influenced by rock properties, including structural heterogeneity. Grain sizes play a crucial role in the rate of phase transformation, impacting the occurrence of faulting. Consequently, grain sizes may also influence b values. We conducted deformation experiments on germanate olivine, an analog silicate olivine material, with various grain sizes to reveal the effect of grain size on the difference in b value during the phase transformation faulting. We used a Griggs-type deformation apparatus and measured acoustic emissions (AE) with an AE transducer, which was calibrated by laser-doppler interferometry. This calibration enabled the acquisition of AE waveforms with a unit of velocity (m/s), facilitating comparison to natural earthquakes. b values in the fine-grained aggregates (a few μm) are smaller than those in the coarse-grained aggregates (hundreds μm) at the same deformation conditions. In the coarse-grained aggregates, the heterogeneous formation of spinel aggregates contributes to high b values. Conversely, in the fine-grained aggregates, the homogeneous formation of spinel grains inside olivine at the grain boundaries results in lower b values. Therefore, the homogeneity (or heterogeneity) of spinel formation appears to be a controlling factor for b values in phase transformation faulting associated with deep-focus earthquakes. Supplementary Material File (1002804_0_merged_1721781684.pdf) Download 28.18 MB File (jgr__deep_focus_eartquakes.pdf) Download 28.10 MB File (jgr__deep_focus_eartquakes_sup.pdf) Download 19.13 MB Information & Authors Information Version history V1 Version 1 31 July 2024 Copyright This work is licensed under a Non Exclusive No Reuse License. Keywords acoustic emission deep-focus earthquakes deformation experiments geology gutenberg-richter law phase transformation Authors Affiliations Sando Sawa 0000-0002-3645-9505 [email protected] Tohoku University View all articles by this author Julien Gasc Éole Normale Supérieure-CNRS UMR8538 View all articles by this author Nobuyoshi Miyajima 0000-0002-6226-5675 Bayerisches Geoinstitut, Universitaet Bayreuth View all articles by this author Alexandre Schubnel Ecole Normale Supérieure View all articles by this author Marie Baïsset 0000-0001-5611-5470 Université de Rennes View all articles by this author Jun Muto 0000-0001-8493-4051 Tohoku University View all articles by this author Metrics & Citations Metrics Article Usage 345 views 166 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation Sando Sawa, Julien Gasc, Nobuyoshi Miyajima, et al. Magnitude distribution during phase transformation faulting: Implication for deep-focus earthquakes. Authorea . 31 July 2024. DOI: https://doi.org/10.22541/au.172243928.81251816/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download. For more information or tips please see 'Downloading to a citation manager' in the Help menu . Format Please select one from the list RIS (ProCite, Reference Manager) EndNote BibTex Medlars RefWorks Direct import Tips for downloading citations document.getElementById('citMgrHelpLink').addEventListener('click', function() { popupHelp(this.href); return false; }); $(".js__slcInclude").on("change", function(e){ if ($(this).val() == 'refworks') $('#direct').prop("checked", false); $('#direct').prop("disabled", ($(this).val() == 'refworks')); }); View Options View options PDF View PDF Figures Tables Media Share Share Share article link Copy Link Copied! Copying failed. 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