gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2011-2-1-0032gtcrust-122Research ArticleТЕКТОНОФИЗИКАTECTONOPHYSICSЭКСПЕРИМЕНТАЛЬНОЕ ИЗУЧЕНИЕ ПРОЦЕССА ПРЕРЫВИСТОГО СКОЛЬЖЕНИЯ ПО РАЗЛОМАМ С ИЗГИБОМTHE EXPERIMENTAL STUDY ON STICK­SLIP PROCESS  OF BENDING FAULTSЮаншуанГуоYanshuangGuo

Лаборатория динамики землетрясений,

100029, Пекин

State key laboratory of earthquake dynamics, 

100029, Beijing

guoyshig@gmail.comДжинМаJinMa

Лаборатория динамики землетрясений,

100029, Пекин

State key laboratory of earthquake dynamics,

100029, Beijing

dzjmajin@gmail.comЛонгЮнLongYun

Лаборатория динамики землетрясений, 

100029, Пекин

State key laboratory of earthquake dynamics,

100029, Beijing

yunl1985@126.comБорняковСергей АлександровичBornyakovSergei A.

канд. геол.­мин. наук, с.н.с., лаб. тектонофизики,

664033, Иркутск, ул. Лермонтова, 128

Candidate of Geology and Mineralogy, Senior Researcher, Lab. of Tectonophysics,

664033, Irkutsk, Lermontov street, 128

bornyak@crust.irk.ruИнститут геологии, Китайская администрация по землетрясениям КитайInstitute of Geology, China Earthquake AdministrationChinaИнститут геологии, Китайская администрация по землетрясениямКитайInstitute of Geology, China Earthquake AdministrationChinaИнститут земной коры СО РАН РоссияInstitute of the Earth’s Crust, Siberian Branch of RASRussian Federation201115092015213544Copyright © Юаншуан Г., Джин М., Лонг Ю., Борняков С.А., 20152015Юаншуан Г., Джин М., Лонг Ю., Борняков С.А.Yanshuang G., Jin M., Long Y., Bornyakov S.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.gt-crust.ru/jour/article/view/122

В данной статье описаны эксперименты по изучению процесса прерывистого скольжения по разломам с изгибом с изменением направления под углом 5° в точке соединения двух участков данного разлома. В лабораторных условиях для изучения динамики и параметров развития физических полей применялись методики замера смещений по разломам, анализа тензора деформаций и акустической эмиссии (АЭ). По результатам экспериментов по изучению разломов с изгибом было выявлено следующее: 1. Четко установлена негативная корреляция между логарифмом цикла прерывистого скольжения и величиной нагрузки. 2. При различной величине нагрузки большинство нарушений стабильности на разломах с изгибом были проявлены как землетрясения-дублеты. Это означает, что одно событие нарушения стабильности состоит из двух подсобытий. Временной интервал между двумя подсобытиями варьируется от 100 до 200 мс. 3. При разных подходах к наблюдению, несмотря на одинаковую частоту выборки, отмечается различие косейсмической реакции (по замерам деформации была выявлена фаза значительного уменьшения деформации, однако длина смещения по разлому существенно не изменилась перед нарушением стабильности разлома). 4. Эксперименты с применением очень частой выборки позволяют расширить понимание процесса и улучшить осведомленность о предвестниках землетрясений и процессе сейсмогенеза, а также усовершенствовать анализ механизма сильных землетрясений и особенностей афтершоков.

The stick­slip process of bending faults with one angle change of 5° at the connection location between the two line fault segments is investigated in this paper. The dynamic process and physical field evolution were observed in the laboratory, and measurements were recorded with application of fault displacement measurement, strain tensor analysis and acoustic emission (AE) techniques. The experimental results from the study of bending faults give grounds for the following primary conclusions: (1) It is clearly revealed that there is a negative correlation between the logarithms of the stick­slip cycle and loading rate; (2) With different loading rates, most of the instabilities from bending faults occurred as earthquake doublets. It means that an instable event can contains two sub­events which occur with an interval of time from 100 ms to 200 ms. (3) With application of different observation approaches, regardless of the fact that the sampling rates were the same, differences of the co­seismic response were observed. For instance, strain measurements indicated significant strain weakening stage, but fault displacement was not significantly changed before fault instability. (4) Experimental studies of high sampling rates contribute to a better understanding and awareness of earthquake precursors and the seismogenic process; such studies are helpful in analyzing the mechanism of strong earthquake processes and parameters of aftershocks.

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The authors declare that there are no conflicts of interest present.