Influence on Earthquake Distributions in Slabs from Bimaterial Shear Heating

So, Byung‐Dal; Yuen, David A.

doi:10.1002/9781118888865.ch8

Cited by 1 publication

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“…This apparent dilemma implies that deep earthquakes must operate by mechanisms distinct from those of shallow earthquakes. The bimodal depth distribution may further suggest fundamentally different mechanisms for intermediate-focus and deepfocus earthquakes too (Green et al 1992), unless it actually reflects the stress state of negatively buoyant slabs under viscous resistance from the lower mantle (Isacks & Molnar 1971, Vassiliou & Hager 1988, Gunawardana & Morra 2017) (Figure 2) or due to phase changes (Nakajima et al 2013, Liu & Zhang 2015, So & Yuen 2015, Incel et al 2019.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms and Implications of Deep Earthquakes

Zhan

2020

Annu. Rev. Earth Planet. Sci.

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Deep earthquakes behave like shallow earthquakes but must have fundamentally different physical processes. Their rupture behaviors, magnitude-frequency statistics, and aftershocks are diverse and imperfectly dependent on various factors, such as slab temperature, depth, and magnitude. The three leading mechanisms for deep earthquakes (i.e., transformational faulting, dehydration embrittlement, and thermal runaway) can each explain portions of the observations but have potentially fundamental difficulties explaining the rest. This situation calls for more serious consideration of hypotheses that involve more than one mechanism. For example, deep earthquakes may initiate by one mechanism, but the ruptures may propagate via another mechanism once triggered. To make further progress, it is critical to evaluate the hypotheses, both single- or dual-mechanism, under conditions as close to those of real slabs as possible to make accurate and specific predictions that are testable using seismic or other geophysical observations. Any new understanding of deep earthquakes promises new constraints on subduction zone structure and dynamics. ▪ Deep earthquakes display the complex structure and dynamics of subduction zones in terms of geometry, stress state, rheology, hydration, and phase changes. ▪ Phase transformation, dehydration, and thermal runaway are the leading mechanisms for deep earthquakes, but all have major gaps or fundamental difficulties. ▪ Deep earthquakes may involve dual-mechanism processes, as hinted at by the diverse rupture and statistic properties and the break of self-similarity. ▪ Further progresses would benefit from specific and testable predictions that consider realistic slab conditions with insights from geodynamics, petrology, and mineral physics.

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Section: Introductionmentioning

confidence: 99%

Mechanisms and Implications of Deep Earthquakes

Zhan

2020

Annu. Rev. Earth Planet. Sci.

View full text Add to dashboard Cite

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Influence on Earthquake Distributions in Slabs from Bimaterial Shear Heating

Cited by 1 publication

References 65 publications

Mechanisms and Implications of Deep Earthquakes

Mechanisms and Implications of Deep Earthquakes

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