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| DOI | 10.1029/2020GL087434 |
| Stress-Dependent b Value Variations in a Heterogeneous Rate-and-State Fault Model | |
| Dublanchet P. | |
| 发表日期 | 2020 |
| ISSN | 0094-8276 |
| 卷号 | 47期号:13 |
| 英文摘要 | The magnitudes of earthquakes are known to follow a power law distribution referred to as the Gutenberg-Richter empirical law. Seismological observations and laboratory experiments suggest a decrease of the decay exponent (b value) with differential stress. The physical mechanism controlling this decrease, however, remains unclear. The present study is dedicated to the origin of relative b value variations with stress obtained in a 2-D rate-and-state planar fault model considering a population of asperities with size-dependent fracture energy. The simulations show that both b value in the intermediate magnitude range and mainshock magnitude increase with normal stress. Analytical relationships are derived, showing that the increase of b value is related to the decrease of critical nucleation length with normal stress, enhancing the productivity of small-magnitude events and partial ruptures. The theoretical formulas also show how the increase of mainshock magnitude is a consequence of normal stress dependence of stress drop. ©2020. American Geophysical Union. All Rights Reserved. |
| 英文关键词 | Earthquakes; Critical nucleation; Differential stress; Laboratory experiments; Partial rupture; Physical mechanism; Power law distribution; Stress-dependent; Theoretical formula; Road construction; analytical method; earthquake magnitude; empirical analysis; experimental study; fault plane; heterogeneity; low velocity zone; power law distribution; shock wave |
| 语种 | 英语 |
| 来源期刊 | Geophysical Research Letters
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/170179 |
| 作者单位 | MINES ParisTech, PSL Research University, Centre de Géosciences, Fontainebleau, France |
| 推荐引用方式 GB/T 7714 | Dublanchet P.. Stress-Dependent b Value Variations in a Heterogeneous Rate-and-State Fault Model[J],2020,47(13). |
| APA | Dublanchet P..(2020).Stress-Dependent b Value Variations in a Heterogeneous Rate-and-State Fault Model.Geophysical Research Letters,47(13). |
| MLA | Dublanchet P.."Stress-Dependent b Value Variations in a Heterogeneous Rate-and-State Fault Model".Geophysical Research Letters 47.13(2020). |
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