Fully dynamic earthquake sequence simulation of a fault in a viscoelastic medium using a spectral boundary integral equation method : does interseismic stress relaxation promote aseismic transients?
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- Material Type
- 記事
- Author/Editor
- Yuki MiyakeHiroyuki Noda
- Publication, Distribution, etc.
- Publication Date
- 2019-12-05
- Publication Date (W3CDTF)
- 2019-12-05
- Periodical title
- EPS : Earth, Planets and Space
- No. or year of volume/issue
- 71(137)
- Volume
- 71(137)
- ISSN (Periodical Title)
- 1880-5981
- ISSN-L (Periodical Title)
- 1343-8832
- Text Language Code
- eng
- DOI
- 10.1186/s40623-019-1113-8
- Persistent ID (NDL)
- info:ndljp/pid/11467682
- Collection
- Collection (Materials For Handicapped People:1)
- Collection (particular)
- 国立国会図書館デジタルコレクション > 電子書籍・電子雑誌 > その他
- Acquisition Basis
- オンライン資料収集制度
- Date Accepted (W3CDTF)
- 2020-03-23T18:58:42+09:00
- Date Captured (W3CDTF)
- 2020-03-23
- Format (IMT)
- application/pdf
- Access Restrictions
- 国立国会図書館内限定公開
- Service for the Digitized Contents Transmission Service
- 図書館・個人送信対象外
- Availability of remote photoduplication service
- 可
- Periodical Title (URI)
- Periodical Title (Persistent ID (NDL))
- info:ndljp/pid/11245705
- Data Provider (Database)
- 国立国会図書館 : 国立国会図書館デジタルコレクション
- Summary, etc.
- Along subduction interfaces or some major faults, a seismogenic layer in the upper crust is underlain by a zone of slow-slip events (SSEs) and tremors, and seismicity disappears at greater depths. The transition between seismogenic and aseismic behavior may be caused by changes in the frictional properties of the fault or changes in viscoelastic properties of the surrounding medium. Although aseismic transients have been numerically generated in previous studies by changing the frictional properties and compared to SSEs, the effect of viscoelasticity on the transition remains to be studied. In this study, we implemented interseismic viscoelastic stress relaxation in a simulation code for two-dimensional antiplane fully dynamic earthquake sequences in a uniform elastic material based on a spectral boundary integral equation method. In the implementation, we developed a suitable algorithm in which the viscoelastic relaxation is calculated by evolution of an “effective slip, ” which gives viscoelastic stress change on the fault if convolved with a static Green’s function. We conducted parametric studies for a fault with a rate-weakening patch on two parameters: viscoelastic relaxation time t[c] and characteristic length of the state evolution in the rate- and state-dependent friction law L. The behavior of the simulated fault can be classified into four classes, earthquakes (EQ), aseismic transients (AT), stable sliding (SS), and stuck (ST), in which the central part of the rate-weakening patch has a diminishingly small slip rate and is permanently locked. A phase diagram of the fault behavior shows that there are two different types of seismogenic–aseismic transition. As L increases, an EQ patch changes to an AT patch before becoming an SS patch, as has been reported in previous studies in an elastic limit. The boundary between AT and SS can be explained via linear stability analysis of a system composed of a spring, a dashpot, and sliders. As t[c] decreases, the recurrence interval of the earthquakes diverges, and an EQ patch changes to an ST patch unless L is within a narrow range. Therefore, the transition associated with SSEs and tremors is dominated by changes in frictional properties rather than changes in viscoelastic properties.
- DOI
- 10.1186/s40623-019-1113-8
- Access Restrictions
- インターネット公開
- Rights (production)
- © The Author(s) 2019.This article is distributed under the terms of the Creative Commons Attribution 4.0 International License, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
- Related Material (URI)
- Is Referenced By
- Homoclinic bifurcation of a rate-weakening patch in a viscoelastic medium and effect of strength contrastDynamic earthquake sequence simulation with a SBIEM without periodic boundariesComparison of two time-marching schemes for dynamic rupture simulation with a space-domain BIEMViscoelasticity modeling of clay minerals by dynamic viscoelasticity measurement and its implications for earthquake faultingDynamic earthquake sequence simulation with an SBIEM accounting for interseismic poroelastic reboundSpecial issue "Crustal dynamics : toward integrated view of island arc seismogenesis
- References
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- References (URI)
- Data Provider (Database)
- 国立情報学研究所 : CiNii Research
- Original Data Provider (Database)
- 学術機関リポジトリデータベース雑誌記事索引データベースCrossref科学研究費助成事業データベースCrossrefCrossrefCrossrefCrossrefCrossrefCrossref
- Bibliographic ID (NDL)
- 11467682