Modelling non-volcanic tremor, slow slip events and large earthquakes in the Guerrero subduction zone (Mexico) with space-variable frictional weakening and creep
Modelling non-volcanic tremor, slow slip events and large earthquakes in the Guerrero subduction zone (Mexico) with space-variable frictional weakening and creep
复制标题
利用空间变量摩擦减弱和蠕变对格雷罗俯冲带（墨西哥）的非火山震颤、慢滑移事件和大地震进行建模
DOI：
10.1093/gji/ggv174
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发表时间：
2015
影响因子：
2.8
通讯作者：
M. Campillo
中科院分区：
文献类型：
--
作者：
D. Zigone;Y. Ben‐Zion;M. Campillo
S U M M A R Y我们探索与数值模拟的基本物理条件，导致非火山震颤（NVT）的关键观察功能的慢滑事件（SSE）和地震沿着格雷罗段的墨西哥俯冲带。为了研究不同模式的滑动之间的相互作用，并检查可能的变化超过15年的观测间隔的时间尺度，我们使用一个模型与平面界面受空间变化的静/动摩擦和位错蠕变在3-D弹性固体。在摩擦滑动过程中，零弱化的断层段以对应于“临界脱钉过渡”的模式失效，该模式产生了NVT的许多观察到的特征。具有升高的蠕变系数的贴片表示具有SSE的截面。模拟与小的附加应力振荡被用来检查触发的NVT由大的远程地震。结果再现NVT和SSE在格雷罗地区的基本观测属性，同时指出大地震周期，准周期SSE和尺度不变的NVT行为之间的复杂的相互作用。模型模拟提供了关于不同事件类型的预期频率-震级统计、滑动分布和时空特性的额外信息，这些信息可通过积累未来数据加以检验。一些地震和NVT事件的相对两侧的SSE补丁有显着的分离，其震源和质心。这些事件的速率与SSE段的蠕变演化相关。结果还表明，在该地区的地震形变可能有瞬变的时间尺度大于观测周期。
S U M M A R Y We explore with numerical simulations basic physical conditions leading to key observed features of non-volcanic tremor (NVT) in relation to slow slip events (SSEs) and earthquakes along the Guerrero segment of the Mexican subduction zone. To study the interactions between different modes of slip, and examine possible variations over timescales larger than the 15 year observational interval, we use a model with a planar interface governed by space-varying static/kinetic friction and dislocation creep in a 3-D elastic solid. A fault section with zero weakening during frictional slip fails in a mode corresponding to a ‘critical depinning transition’ that produces generically many observed features of NVT. A patch with elevated creep coefficients represents a section with SSE. Simulations with small added stress oscillations are used to examine triggering of NVT by large remote earthquakes. The results reproduce well the basic observed properties of NVT and SSE in the Guerrero area, while pointing to complex interactions between large earthquake cycles, quasi-period SSE and scale-invariant NVT behaviour. The model simulations provide additional information on expected frequencymagnitude statistics, slip distributions and space–time properties of the different event types that may be tested with accumulation of future data. Some earthquake and NVT events near the opposite sides of the SSE patch have significant separation between their hypocentres and centroids. The rates of these events are correlated with the creep evolution in the SSE section. The results also suggest that aseismic deformation in the area may have transients on timescales larger than the observational period.